How do I properly install a new toilet?

Installing a new toilet is a straightforward DIY plumbing project if you take it step-by-step. Here is how to do it properly:

- Turn off the water supply valve behind the toilet.
- Flush the toilet to drain as much water as possible from the tank and bowl, then sponge out the remaining water.
- Disconnect the water supply line from the tank.
- Remove the bolt caps at the base of the toilet, unscrew the nuts, and gently rock the toilet to break the old seal.
- Lift the toilet straight up off the floor and set it aside.
- Stuff a rag into the open drain hole to block sewer gases while you work.

- Scrape away the old wax ring from the closet flange (the plastic or metal ring on the floor) using a putty knife.
- Inspect the flange for cracks or damage. If it is broken, install a toilet flange repair ring to ensure a secure anchor.
- Remove the rag from the drain pipe.

- Slide the new floor bolts into the slots on the closet flange, positioning them directly across from each other, parallel to the wall.
- Use plastic retainers (usually included with the bolts) to snap them into place so they don't slide around.

- Flip the new toilet bowl upside down on a soft surface (like a towel or piece of cardboard).
- Press the new wax ring firmly around the horn (the circular plastic/ceramic opening) on the bottom of the bowl. *(Tip: You can use a wax ring with a plastic horn for better alignment, or a standard thick wax ring depending on your floor height relative to the flange).* 

- Lift the toilet straight over the flange and lower it down, aligning the floor bolts so they poke up through the holes on the base of the toilet.
- Press straight down evenly with your body weight, giving a slight rock back and forth, to compress the wax ring and create a tight seal. Do not rock it too far or you will ruin the wax seal.

- Place the plastic washers and metal nuts onto the floor bolts. Tighten them alternately (a little on the left, a little on the right) with a wrench. **Do not overtighten** , or the porcelain base will crack.
- Check if the bowl is level. If it wobbles, slip plastic shims under the base until it is stable, then trim the shims flush with the floor.
- Snap the bolt caps into place over the nuts.

- If your toilet is a two-piece model, place the tank onto the bowl following the manufacturer's instructions (attaching the rubber gasket and tightening the tank bolts evenly).
- Reconnect the water supply line to the tank inlet. Hand-tighten, then give it a slight turn with a wrench (do not over-tighten).
- Turn the water supply valve back on and let the tank fill.

- Flush the toilet several times to check for leaks at the tank, the supply line, and the base of the toilet.
- Run a bead of silicone tub-and-tile caulk around the base where it meets the floor. Leave the front gap uncaulked so if a leak ever develops, you'll see the water instead of trapping it under the floorboards.

If you want, let me know:

• Is it a one-piece or two-piece toilet?
• Are you dealing with an unusual floor height (like new tile)?

I can provide specific tips for those situations.

Installing a toilet is very doable as a DIY project if the existing drain flange is in good shape. The key is getting the flange height, wax/seal ring, and bowl seating right.

What you'll need

• New toilet, including tank hardware and seat
• New wax ring or manufacturer-approved rubber seal
• New closet bolts
• Flexible toilet supply line
• Adjustable wrench
• Screwdriver
• Putty knife
• Level
• Hacksaw or bolt cutters
• Sponge/bucket and towels
• Toilet shims, if the floor isn't perfectly level
• Caulk/sealant, if required by your local code or manufacturer's instructions

If you're replacing an existing toilet, never reuse the old wax ring.

1. Shut off the water and remove the old toilet

Turn the shutoff valve clockwise, flush the toilet, and sponge out the remaining water. Disconnect the supply line, remove the nuts from the floor bolts, and carefully lift the toilet straight up. Toilets are heavy, so having another person help is a good idea.

Put a rag temporarily in the drain opening to keep sewer gases out.

2. Inspect and clean the flange

Scrape all of the old wax away with a putty knife.

Then inspect the toilet flange—the ring attached to the drain pipe.

You want it to be:

• Firmly attached to the floor
• Undamaged
• Properly aligned
• At approximately the finished-floor level

If the flange is cracked, badly corroded, loose, or substantially below the finished floor, fix that before installing the toilet. A low flange may require an appropriate flange extender or thicker seal. Don't simply stack two wax rings.

3. Install the new closet bolts

Slide the new bolts into the slots in the flange and position them opposite each other, with the threads pointing upward.

Before using the seal, it's smart to dry-fit the toilet over the bolts. This confirms that the toilet sits properly, is aligned with the wall, and doesn't rock.

4. Install the wax ring

Remove the rag from the drain.

You can either:

• Press the wax ring onto the underside of the toilet bowl, centered around the outlet, or
• Center it on the flange.

Follow the instructions supplied with your particular seal/toilet.

5. Set the bowl

This is the most important part.

Carefully lower the toilet straight down over the closet bolts. Once the wax ring contacts the flange, don't pick the toilet back up or rock it around.

Press down firmly and evenly so the toilet seats against the floor and compresses the seal.

If the bowl rocks because the floor isn't level, use appropriate toilet shims rather than trying to compensate by excessively tightening the bolts.

6. Tighten the bowl

Install the washers and nuts on the closet bolts.

Tighten them a little at a time, alternating sides. Stop when the bowl is firmly seated and doesn't move.

Do not crank down hard on the nuts. Porcelain can crack surprisingly easily.

Cut off excess bolt length with a hacksaw if necessary and install the decorative caps.

7. Install the tank, if it's a two-piece toilet

If the tank isn't already attached:

1. Install the large rubber tank-to-bowl gasket.
2. Lower the tank onto the bowl.
3. Install the tank bolts and washers.
4. Tighten the nuts alternately until the tank is secure and level.
5. Don't overtighten. The goal is snug and stable, not maximum force.

8. Connect the water

Attach the new flexible supply line to the shutoff valve and toilet tank.

Generally, tighten it hand-tight plus a small additional turn with a wrench rather than wrenching it as hard as possible.

Open the shutoff valve slowly and let the tank fill.

9. Test thoroughly

Flush the toilet several times and inspect:

• Around the base of the toilet
• Around the supply-line connections
• Under the tank
• Around the tank-to-bowl connection

Look carefully for even a small amount of water. If water appears around the base, don't assume tightening the floor bolts will fix it—the wax/seal or flange may need to be addressed.

10. Caulk around the base

Once you've confirmed that everything is leak-free and the toilet is properly seated, apply the appropriate caulk/sealant around the base according to your local plumbing code and the manufacturer's instructions. Some codes require sealing the toilet-to-floor joint.

The big three mistakes to avoid: a damaged/low flange, a poorly seated wax ring, and overtightening the porcelain bolts.

If you're installing a toilet where there isn't currently a toilet (new drain, flange, water line, and possibly floor work), that's a substantially different job from simply replacing an existing toilet.

Absolutely. Installing a toilet is a manageable DIY job if the existing flange and plumbing are in good condition. The key is getting the wax/seal, flange, and bowl alignment right—then avoiding overtightening the porcelain.

What you'll need

• New toilet, including tank/bowl hardware
• New wax ring or manufacturer-approved toilet gasket
• New closet bolts
• Adjustable wrench or pliers
• Screwdriver
• Putty knife
• Sponge and bucket
• Level
• Hacksaw or bolt cutter
• Toilet shims, if the floor isn't perfectly level
• Flexible toilet supply line
• Caulk, if appropriate for your local code/manufacturer instructions

Step-by-step

1. Shut off and drain the old toilet

Turn the shutoff valve clockwise. Flush the toilet and hold the handle down to empty the tank. Sponge or towel out remaining water from the tank and bowl.

Disconnect the supply line, remove the nuts from the two floor bolts, and carefully lift the toilet straight up. Toilets are heavy, so having another person help is worthwhile.

2. Inspect and clean the flange

Scrape all of the old wax from the floor flange and clean the surrounding floor.

This is an important checkpoint: the flange should be solidly attached to the subfloor and shouldn't be cracked, badly corroded, or moving. A loose or damaged flange needs to be repaired before installing the toilet.

If the flange is substantially below the finished floor, don't simply stack wax rings. Use the appropriate extra-thick seal or flange extender.

3. Install the new closet bolts

Slide the new bolts into the flange slots and position them opposite each other, parallel with the wall. Use the included washers or retaining hardware to keep them upright.

4. Install the new seal

Follow the toilet/seal manufacturer's instructions. With a traditional wax ring, center it carefully on the flange or on the toilet's outlet horn, depending on the particular ring and installation instructions.

Don't reuse the old wax ring and don't stack two ordinary wax rings.

5. Set the bowl

This is the trickiest part.

With the bowl lifted, align the holes in its base with the two closet bolts. Lower it straight down until the bolts come through the holes and the bowl contacts the seal.

Apply firm downward pressure to compress the seal and seat the toilet. Once the seal is compressed, don't repeatedly rock or lift the toilet, because that can compromise the seal.

6. Level and secure the bowl

Put a level across the bowl. If it's rocking or isn't level, use purpose-made plastic toilet shims.

Install the washers and nuts on the closet bolts. Tighten each side a little at a time, alternating sides, until the toilet is firmly seated.

Do not crank the nuts down. Porcelain can crack from excessive bolt pressure.

Cut off excess bolt length with a hacksaw if necessary and install the decorative caps.

7. Install the tank

For a two-piece toilet, install the large rubber gasket between the tank and bowl. Lower the tank into position and install the tank bolts, washers, and nuts according to the toilet manufacturer's instructions.

Tighten the bolts alternately until the tank is secure and level. Again, don't overtighten—the tank can crack.

8. Connect the water supply

Attach a new flexible supply line between the shutoff valve and toilet fill valve.

Hand-tighten the connections, then give them roughly another quarter turn with a wrench unless the manufacturer's instructions specify otherwise.

9. Turn the water on slowly

Open the shutoff valve slowly and let the tank fill.

Check carefully around:

• The shutoff valve
• Both ends of the supply line
• The tank-to-bowl connection
• The base of the toilet

Flush several times and look for water around the base. A leak appearing at the base usually means the toilet needs to be reseated or the flange/seal needs attention—not simply that the bowl bolts need to be tightened.

10. Finish the base

Whether to caulk around the toilet depends on your local plumbing requirements and the toilet manufacturer's instructions. There is some conflicting guidance: some installation guidance recommends caulking the base, while Home Depot specifically advises against completely caulking it because it can conceal a leak.

If you do caulk it, follow the applicable local code/manufacturer instructions.

The three mistakes to avoid

1. Installing over a damaged or loose flange.
2. Moving the toilet around after you've compressed the wax seal.
3. Overtightening the floor or tank bolts. That's how you turn a perfectly good toilet into cracked porcelain.

If you're replacing an existing toilet without changing the plumbing, the whole job is usually much simpler. If you tell me whether yours is a one-piece or two-piece toilet and whether you're replacing an existing toilet or installing where there isn't one, I can walk you through the exact process and what to watch for.

This is an important checkpoint: the flange should be solidly attached to the subfloor and shouldn't be cracked, badly corroded, or moving. A loose or damaged flange needs to be repaired before installing the toilet.

If the flange is substantially below the finished floor, don't simply stack wax rings. Use the appropriate extra-thick seal or flange extender.

3. Install the new closet bolts

Slide the new bolts into the flange slots and position them opposite each other, parallel with the wall. Use the included washers or retaining hardware to keep them upright.

4. Install the new seal

Follow the toilet/seal manufacturer's instructions. With a traditional wax ring, center it carefully on the flange or on the toilet's outlet horn, depending on the particular ring and installation instructions.

Don't reuse the old wax ring and don't stack two ordinary wax rings.

5. Set the bowl

This is the trickiest part.

With the bowl lifted, align the holes in its base with the two closet bolts. Lower it straight down until the bolts come through the holes and the bowl contacts the seal.

Apply firm downward pressure to compress the seal and seat the toilet. Once the seal is compressed, don't repeatedly rock or lift the toilet, because that can compromise the seal.

6. Level and secure the bowl

Put a level across the bowl. If it's rocking or isn't level, use purpose-made plastic toilet shims.

Install the washers and nuts on the closet bolts. Tighten each side a little at a time, alternating sides, until the toilet is firmly seated.

Do not crank the nuts down. Porcelain can crack from excessive bolt pressure.

Cut off excess bolt length with a hacksaw if necessary and install the decorative caps.

7. Install the tank

For a two-piece toilet, install the large rubber gasket between the tank and bowl. Lower the tank into position and install the tank bolts, washers, and nuts according to the toilet manufacturer's instructions.

Tighten the bolts alternately until the tank is secure and level. Again, don't overtighten—the tank can crack.

8. Connect the water supply

Attach a new flexible supply line between the shutoff valve and toilet fill valve.

Hand-tighten the connections, then give them roughly another quarter turn with a wrench unless the manufacturer's instructions specify otherwise.

9. Turn the water on slowly

Open the shutoff valve slowly and let the tank fill.

Check carefully around:

Installing a new toilet is a straightforward weekend DIY project. Follow these sequential steps for a clean, leak-free installation:

1. Prep the workspace
   • Turn off the water supply valve behind the toilet.
   • Flush the toilet to drain the tank and bowl as much as possible.
   • Use a sponge and bucket to remove any remaining water from the bottom of the tank and bowl.
   • Disconnect the water supply line from the tank using a wrench.
2. Remove the old toilet
   • Pry off the plastic bolt caps on either side of the toilet base.
   • Unscrew the nuts holding the toilet to the floor bolts (use a hacksaw or penetrating oil if they are rusted).
   • Gently rock the toilet side-to-side to break the seal of the old wax ring, then lift it straight up.
   • Stuff a rag into the open drain pipe to block sewer gases while you work.
3. Clean and inspect the flange
   • Scrape away the old wax ring and putty from the toilet flange and the underside of the floor area.
   • Inspect the plastic or metal closet flange. If it's cracked or damaged, install a repair ring now.
   • Remove the rag from the drain pipe and insert new closet bolts into the slots on the flange, sliding them into position (pointing straight up).
4. Prepare the new bowl
   • Lay the new toilet bowl upside-down on a soft surface like a towel or cardboard box.
   • Press the new wax ring firmly around the waste horn (the bottom opening). Tip: If your bathroom is cold, let the wax ring sit at room temperature first so it's pliable.
5. Set the toilet
   • Lift the bowl upright and align the floor bolts with the holes in the toilet base.
   • Lower the toilet straight down over the bolts.
   • Press down firmly with your body weight, rocking slightly side-to-side to compress the wax ring and create a tight seal. Do not rock it too far or you can crack the porcelain!
   • Place the washers and nuts onto the floor bolts and tighten them alternately (a little on the left, a little on the right) until snug. Do not overtighten , or the porcelain will crack. Snap the plastic bolt caps on.
6. Assemble the tank (if separate)
   • Place the large rubber gasket over the threaded opening at the bottom of the tank.
   • Lower the tank onto the back of the bowl, aligning the rubber washers and bolts provided by the manufacturer.
   • Tighten the tank-to-bowl nuts evenly until the tank is level and stable against the bowl.
7. Connect the water and test
   • Connect the flexible water supply line to the tank inlet and the wall valve. Tighten by hand, then give it a quarter-turn with a wrench.
   • Turn the water supply back on and let the tank fill.
   • Check for leaks around the tank-to-bowl connection and the base. Flush the toilet a few times to test the mechanism and look for leaks at the floor level.
8. Caulk and finish
   • Apply a neat bead of silicone caulk around the base of the toilet where it meets the floor (leave a small 1-inch gap at the back so if a leak ever happens, you'll see it rather than trapping water under the floor).
   • Install the toilet seat according to the manufacturer instructions.

If you'd like, let me know:

• Is your floor uneven or is the flange sitting too high/low?
• Are you replacing an old-style 3-bolt or standard 2-bolt setup?

I can help you troubleshoot any installation quirks or spacing issues!

Installing a toilet is usually a manageable DIY job, but the wax seal, flange, and mounting bolts need to be done correctly to prevent leaks.

What you’ll need

• New toilet with its installation hardware
• New wax ring or manufacturer-approved rubber seal
• New toilet supply line (recommended)
• Adjustable wrench
• Screwdriver
• Putty knife
• Level
• Bucket, towels, and gloves
• Hacksaw or bolt cutters for trimming mounting bolts
• Shims if the floor is uneven

Follow the toilet manufacturer's instructions as the final authority, since some toilets use proprietary seals or mounting systems.

Step-by-step

1. Check the rough-in before installing. Measure from the finished wall to the center of the toilet flange/bolt holes. A common rough-in is 12 inches, but don't assume—verify that your new toilet matches the existing plumbing.
2. Shut off and drain the old toilet. Turn the shutoff valve clockwise, flush, sponge or vacuum out remaining water, and disconnect the supply line. Keep a bucket underneath.
3. Remove the old toilet. Remove the bolt caps and nuts, then gently rock the toilet side-to-side to break the old seal. Lift it straight up and move it aside. Toilets are heavy, so having another person help is a good idea.
4. Clean and inspect the flange. Scrape all old wax away. The flange should be solid and properly secured to the floor. If it's cracked, badly corroded, loose, or significantly below the finished floor, fix that before installing the toilet. A low flange may require an appropriate thicker seal or flange extender.
5. Install the new mounting bolts. Put the T-bolts/closet bolts into the flange slots and orient them according to the toilet's instructions.
6. Install the new wax ring/seal. Use a new seal—never reuse the old one. Depending on the toilet and seal design, it may go on the flange or onto the toilet outlet. If it has a plastic cone, the tapered end generally points down into the flange.
7. Set the toilet. Carefully lower the bowl straight down over the bolts, making sure the outlet is centered over the flange. Press down evenly to compress the seal. Don't rock, lift, or reposition the toilet after the seal has been compressed; doing so can compromise the watertight seal.
8. Secure the toilet. Install the washers and nuts and tighten them alternately, a little at a time. Stop when the toilet is firmly seated and stable. Don't crank them down—overtightening can crack the porcelain.
9. Make it level. Check the bowl with a level. If necessary, use appropriate toilet shims rather than forcing the porcelain down against an uneven floor. Trim exposed shims neatly afterward.
10. Install the tank, if it's a two-piece toilet. Follow the manufacturer's sequence for the tank gasket, bolts, washers, and nuts. Tighten until secure and level, but don't overtighten.
11. Connect the water supply. Attach the supply line to the shutoff valve and toilet. Open the valve slowly and let the tank fill.
12. Test for leaks. Flush several times while inspecting:

• Around the base of the toilet
• Both sides of the flange area
• The supply-line connections
• The tank-to-bowl connection on two-piece toilets

If you see water around the base, don't simply caulk over it—the wax/seal may need to be replaced. 13. Finish the base. If required by your local code and/or recommended by the manufacturer, apply an appropriate bathroom sealant around the base. Leave an intentional opening at the rear if that is your preferred way to make a leak visible, unless your local requirements or manufacturer's instructions specify otherwise.

The three biggest mistakes to avoid

• Reusing the old wax ring — always install a new seal.
• Rocking the toilet after setting it — this can break the seal and cause a hidden leak.
• Overtightening the mounting nuts — porcelain can crack surprisingly easily.

If you're replacing an existing toilet, the job is often straightforward. If the flange is damaged, the floor is rotten, the toilet doesn't match the rough-in, or the drain plumbing needs modification, that's where I'd stop and address the underlying plumbing before setting the new toilet.

Installing a new toilet is a very manageable DIY project if you take it step-by-step. Here is your roadmap to getting it done cleanly and correctly:

Tools & Materials Needed

• New toilet (bowl, tank, seat, and hardware)
• Wax ring (with or without a plastic funnel)
• New closet bolts (T-bolts)
• Adjustable wrench and pliers
• Sponge and bucket (for bailing water)
• Utility knife and rags
• Plumber's putty or silicone caulk
• Level

Step-by-Step Installation

1. Shut off the water
   • Turn the water supply valve clockwise until fully closed. Flush the toilet to drain the tank, then use a sponge and bucket to soak up any remaining water left in the bottom of the tank and bowl.
2. Disconnect the supply line
   • Place a small towel or bucket underneath the supply connection on the bottom of the tank. Unscrew the water supply line from the tank using an adjustable wrench.
3. Remove the old toilet
   • Pry off the bolt caps on each side of the base. Remove the nuts holding the toilet to the floor. Lift the toilet straight up off the floor flange (it can be heavy/awkward—get a helper if needed). Stuff a rag into the open drain hole to block sewer gases while you work.
4. Clean the flange and prep the floor
   • Remove the old wax ring completely from the toilet flange and the bottom of the old toilet using a putty knife. Wipe the area clean. Remove the old T-bolts from the flange slots and slide the new closet bolts into place.
5. Install the new wax ring
   • Remove the rag from the drain pipe. Invert the new toilet bowl and place it upside down on a soft surface (like cardboard). Press the new wax ring firmly around the waste horn on the bottom of the bowl. (Tip: Make sure the tapered/funnel side faces outward from the bowl if it has one).
6. Set the toilet
   • Lift the bowl and carefully lower it straight down, aligning the floor closet bolts so they poke up through the holes in the ceramic base. Press down firmly with your body weight, rocking slightly side-to-side to compress the wax ring. Do not tilt or rock it after it touches down, or you'll break the wax seal.
7. Secure the bowl
   • Place the plastic retainer washers and nuts onto the bolts. Tighten the nuts alternately (a little on the left, a little on the right) with a wrench until snug. Do not overtighten , or you will crack the porcelain. Snap the decorative bolt caps on top. Place a level across the bowl rim to ensure it is even.
8. Assemble the tank to the bowl
   • Place the large rubber tank-to-bowl gasket over the large plastic nut/opening on the underside of the tank. Lower the tank onto the back of the bowl, aligning the rubber washers and metal bolts provided with the tank kit. Tighten the tank bolts evenly until the tank sits level and firm against the bowl.
9. Reconnect water and test
   • Reconnect the water supply line to the tank inlet (hand-tighten, then give a quarter-turn with a wrench—do not over-tighten). Turn the water supply valve back on and let the tank fill. Flush the toilet a few times and check the base and connections for any leaks.
10. Caulk the base
    • Run a neat bead of silicone caulk around the base where it meets the floor. Leave the back portion uncaulked so that if a leak ever develops underneath, you will see it immediately rather than rotting the subfloor. Finally, attach the toilet seat.

If you'd like, let me know:

• Is your existing floor flange made of plastic or metal, and is it level with the floor?
• Do you need help choosing a rough-in size or water supply line?

Installing a new toilet is a straightforward DIY project if you take it step-by-step. Here is a clear guide to getting it done right.

Tools & Materials Needed

• Adjustable wrench and pliers
• Putty knife or scraper
• Level
• Sponge and bucket (for draining water)
• New wax ring (with or without a plastic horn)
• New closet bolts (t-bolts)
• Supply line (recommended to replace with a new one)
• Silicone caulk (optional, for sealing the base)
• Rags and safety glasses

Step-by-Step Installation

1. Shut off the water
   • Turn the water supply valve (located on the wall behind the toilet) clockwise until fully closed.
   • Flush the toilet to drain as much water as possible from the tank and bowl.
2. Remove the old toilet
   • Use a sponge and bucket to soak up any remaining water in the bottom of the tank and bowl.
   • Disconnect the supply line from the bottom of the tank using an adjustable wrench.
   • Pry off the bolt caps on each side of the toilet base and remove the nuts holding the toilet to the floor.
   • Gently rock the toilet side-to-side to break the wax seal, then lift it straight up off the flange. (Pro tip: Stuff a rag into the open drain hole to block sewer gases while you work).
3. Clean the floor flange
   • Scrape away the old wax ring and putty from the brass closet flange using a putty knife.
   • Inspect the flange; if it is cracked or damaged, install a repair ring before proceeding.
   • Remove the old closet bolts from the flange slots and slide the new bolts into place, securing them with the plastic retainers so they stand upright.
4. Install the new wax ring
   • Turn the new toilet bowl upside down on a soft, padded surface (like a piece of cardboard or a towel).
   • Press the new wax ring firmly around the horn (the circular opening at the bottom of the bowl). Do not use old or deformed wax rings.
5. Set the bowl
   • Remove the rag from the floor drain.
   • Lift the toilet bowl straight over the flange, carefully aligning the new floor bolts so they poke up through the holes in the porcelain base.
   • Lower the bowl straight down. Sit or press down firmly with your body weight on the rim of the bowl to compress the wax ring and create a tight seal. Do not rock the toilet back and forth once it touches the wax, or you may break the seal.
   • Place the plastic washers and metal nuts onto the bolts. Tighten the nuts alternately (a little on the left, a little on the right) until snug. Do not overtighten , or you can crack the porcelain base. Snap the bolt caps on.
6. Assemble the tank (if separate)
   • If your tank isn't pre-attached to the bowl, place the large rubber gasket over the flush valve nut on the bottom of the tank.
   • Lower the tank onto the back of the bowl, aligning the rubber washers and nuts. Tighten the tank-to-bowl bolts evenly until the tank sits level and secure against the bowl.
7. Connect the water supply
   • Attach the water supply line to the tank inlet and the shut-off valve. Tighten by hand, then give it a quarter-turn with a wrench. Do not overtighten.
   • Turn the water supply valve back on counter-clockwise. Let the tank fill completely.
8. Test and finish
   • Flush the toilet several times and check the base and connections for any leaks.
   • Place a level across the top of the bowl to ensure it is even (use plastic shims underneath if it wobbles). Trim the closet bolts with a hacksaw if they are too long for the cap.
   • Run a bead of silicone caulk around the base where it meets the floor (leave the back small gap uncaulked so if a leak ever happens, you'll see it immediately rather than rotting the subfloor).

If you'd like, tell me:

• Is your current flange plastic or metal?
• Are you dealing with a one-piece or two-piece toilet?

I can give you specific tips for your exact model.

Installing a toilet is a very manageable DIY job if the existing flange and drain are in good condition. The key is getting the wax/seal ring, flange, and bowl alignment right and avoiding overtightening the porcelain.

What you’ll need

• New toilet with installation hardware
• New wax ring or manufacturer-approved waxless seal
• New flexible toilet supply line
• Adjustable wrench or socket wrench
• Screwdriver
• Putty knife
• Sponge, bucket, and towels
• Hacksaw
• Level
• Toilet shims if the floor isn't perfectly level

Before starting, verify the toilet's rough-in measurement matches your bathroom—typically about 12 inches from the finished wall to the center of the drain, but don't assume.

1. Shut off and remove the old toilet

1. Turn off the shutoff valve.
2. Flush and hold the handle down to drain the tank.
3. Sponge out remaining water from the tank and bowl.
4. Disconnect the supply line.
5. Remove the caps, nuts, and washers from the floor bolts.
6. Carefully rock the toilet side-to-side to break the old seal, then lift it away. Toilets are heavy, so get help if necessary.

Plug the exposed drain temporarily with a rag so sewer gas doesn't come into the room.

2. Inspect the flange

Scrape all of the old wax off the flange and clean the surrounding floor.

The flange should be securely attached to the subfloor and should not move. If it's cracked, badly corroded, or sitting substantially below the finished floor, fix that before installing the toilet. A low flange may require an extra-thick seal or flange extender. Don't stack two wax rings.

Also make sure the new toilet's bolt spacing and rough-in match the existing flange.

3. Install the new seal and bolts

Install the new closet bolts into the flange slots and orient them parallel to the wall.

Then install the new wax ring according to its instructions. Some rings go on the flange; others can be pressed onto the toilet horn. The important thing is that it's centered properly. Never reuse the old wax ring.

4. Set the bowl

Remove the rag from the drain.

Carefully lower the toilet straight down over the two closet bolts. Make sure the bolts pass through the holes in the base.

Once the bowl contacts the wax ring, press straight down evenly to compress the seal. Don't twist or repeatedly lift the toilet afterward—you can compromise the seal.

Check it with a level. If it's rocking, use toilet shims rather than trying to solve the problem by cranking down harder on the bolts.

5. Tighten the bowl

Put the washers and nuts onto the closet bolts.

Tighten them alternately, a little at a time, until the toilet is firmly seated and doesn't rock. Do not overtighten—the porcelain can crack. Trim excess bolt length with a hacksaw and install the decorative caps.

6. Install the tank, if it's a two-piece toilet

Install the large rubber gasket on the bottom of the tank, lower the tank onto the bowl, and install the tank bolts.

Tighten the bolts alternately until the tank is secure and reasonably level. Again, don't overtighten; you're tightening porcelain against porcelain/rubber, not trying to crush the gasket. Manufacturer instructions specifically warn against overtightening these connections.

7. Connect the water

Attach the new flexible supply line to the shutoff valve and toilet fill valve. Hand-tighten the connections first, then snug them with a wrench according to the manufacturer's instructions.

Slowly open the shutoff valve and let the tank fill.

Check every connection for dripping water.

8. Test several flushes

Flush the toilet several times while watching:

• The supply-line connections
• The tank-to-bowl connection
• Around the toilet's base
• The floor immediately around the flange

A leak at the base is particularly important—it can indicate a problem with the seal or flange.

9. Finish the base

Once you're certain there are no leaks and the toilet is stable, follow your local code and the toilet manufacturer's instructions regarding caulking around the base. There is some variation in guidance here: some manufacturers/installers recommend caulking the base, while other installation guidance recommends leaving an opening or not caulking so a future leak can become visible. Follow the instructions supplied with your particular toilet and applicable local code.

The three biggest mistakes to avoid:

1. Setting a toilet on a damaged or loose flange.
2. Moving the toilet after the wax seal has been compressed.
3. Overtightening the floor or tank bolts and cracking the porcelain.

If you're installing a toilet where one wasn't previously installed, rather than simply replacing an existing one, the job is more involved because you'll need to establish the drain, flange, water supply, and correct rough-in. In that situation, I'd recommend treating the flange/drain work as a separate project.

Installing a new toilet is a very manageable DIY project if you take it step-by-step. Here is a clear guide to getting it done right.

Tools and Materials Needed

• New toilet (bowl, tank, seat, and hardware)
• Wax ring (with or without a plastic flange horn)
• Adjustable wrench and pliers
• Screwdrivers (flathead and Phillips)
• New water supply line (recommended)
• Bucket, large sponge, and towels (for cleanup)
• Putty knife or scraper
• Level
• Caulk and caulking gun

Step-by-Step Installation Instructions

1. Prep and Drain
   • Turn off the water supply valve located behind/beside the toilet.
   • Flush the toilet to drain as much water as possible from the tank and bowl.
   • Use a sponge and bucket to remove any remaining water from inside the tank and bowl.
2. Disconnect and Remove the Old Toilet
   • Disconnect the water supply line from the bottom of the tank using an adjustable wrench.
   • Remove the bolt caps on each side of the base of the toilet.
   • Unscrew the nuts holding the toilet to the floor. (If rusted, you may need penetrating oil or a hacksaw).
   • Gently rock the toilet side-to-side to break the seal of the old wax ring, then lift it straight up.
   • Stuff a rag or old towel into the floor drain pipe to block sewer gases while you work.
3. Clean the Flange and Prepare the Area
   • Scrape away the old wax from the toilet flange (the plastic or metal ring on the floor) using a putty knife.
   • Clean the area around the base. Inspect the flange; if it is cracked or damaged, install a repair ring now.
   • Remove the rag from the floor drain.
   • Ensure the two floor bolts are upright and properly seated in the slots of the flange.
4. Install the Wax Ring
   • Turn the new toilet bowl upside down on a soft surface (like a towel or cardboard box).
   • Press the new wax ring firmly around the waste opening (horn) on the bottom of the bowl.
   • Tip: Some DIYers prefer to place the wax ring directly on the floor flange instead, but placing it on the bowl ensures alignment.
5. Set the Toilet Bowl
   • Lift the bowl carefully (get help if needed) and align the floor bolts with the holes in the base of the toilet.
   • Lower the toilet straight down onto the flange without tilting it.
   • Sit or press down firmly with your body weight on the rim of the bowl to compress the wax ring and create a tight seal. Do not rock it side-to-side once it touches the wax.
   • Place a level across the top bowl rim to make sure it is level. If it's rocking or unlevel, use plastic shims underneath before tightening bolts.
6. Secure the Bowl
   • Place the plastic washers and metal nuts onto the floor bolts.
   • Tighten the nuts alternately (a little on the left, a little on the right) with a wrench. Do not overtighten , or you will crack the porcelain.
   • Snap the bolt caps into place.
7. Assemble and Mount the Tank
   • If the tank isn't pre-attached to the bowl, place the large rubber gasket/seal over the flush valve nut on the bottom of the tank.
   • Place the rubber tank-to-bowl washers/bolts inside the tank and lower the tank onto the back of the bowl, aligning the rubber gasket.
   • Hand-tighten the nuts underneath the bowl alternately until the tank sits level and stable against the bowl. Do not overtighten.
8. Connect Water and Test
   • Connect a new water supply line from the wall shut-off valve to the bottom of the tank. Tighten securely (hand-tight plus a quarter turn with a wrench).
   • Turn the water supply valve back on and let the tank fill.
   • Flush the toilet several times to check for leaks at the tank bolts, supply line connection, and the base of the toilet.
9. Install the Seat and Finish
   • Attach the toilet seat to the top of the bowl using the provided hardware.
   • Run a neat bead of silicone caulk around the base of the toilet where it meets the floor. Note: Leave a small 1-inch gap at the very back of the base; this allows you to spot any hidden leaks early rather than trapping water under the floor.

If you'd like, let me know:

• Is your floor tile, wood, or vinyl?
• Are you replacing an old floor flange , or does everything look solid?

I can give you extra tips tailored to your specific setup.

Installing a toilet is usually a manageable DIY job if the existing flange and drain are in good shape. The key is getting the flange, seal, and toilet properly aligned and avoiding movement after the seal is compressed.

What you’ll need

• New toilet
• New wax ring or manufacturer-approved rubber seal
• New closet bolts/hardware
• Adjustable wrench
• Putty knife or scraper
• Screwdriver
• Bucket and towels
• Level
• Hacksaw (to trim bolts)
• Toilet shims if the floor isn't perfectly level
• Gloves

Follow the toilet manufacturer's instructions if they differ from these general steps.

1. Shut off and drain the old toilet

Turn the shutoff valve clockwise. Flush the toilet and hold the handle down to empty the tank. Sponge or towel out remaining water from the tank and bowl.

Disconnect the supply line, remove the nuts from the floor bolts, and carefully lift the toilet straight up. Toilets are heavy, so a second person is helpful.

2. Inspect and clean the flange

Scrape all of the old wax away from the floor flange.

The flange should be solidly attached to the floor and shouldn't be cracked, badly corroded, or moving. If it's damaged—or sits substantially below the finished floor—you may need a flange repair ring, extender, or replacement rather than simply installing the toilet.

If the toilet isn't going on immediately, temporarily cover the open drain to prevent sewer gases from entering the room.

3. Install the new closet bolts and seal

Put the new T-bolts into the flange slots and orient them so they line up with the toilet's mounting holes.

Install a new wax ring—never reuse the old one. Depending on the particular toilet/seal, the ring can be placed on the flange or on the bottom of the toilet. If the flange is below the finished floor, you may need a thicker seal or flange extender.

If your wax ring has a plastic funnel, follow its instructions; Kohler, for example, specifies the tapered end pointing downward into the flange.

4. Set the toilet

This is the most important part.

Carefully lower the toilet straight down over the bolts, aligning the mounting holes. Once it contacts the wax ring, press down evenly until the toilet is fully seated.

Don't rock, lift, or twist the toilet around after it has been set. Movement can compromise the wax seal and cause a hidden leak.

If the toilet rocks because the floor isn't perfectly flat, use toilet shims rather than trying to compensate by excessively tightening the bolts.

5. Tighten the toilet to the floor

Install the washers and nuts on the closet bolts. Tighten them alternately from side to side, gradually.

Don't crank them down hard. The objective is to hold the toilet firmly against the floor—not to compress the porcelain. Over-tightening can crack the bowl. One Kohler installation guide specifies hand-tightening followed by only about a quarter-turn with a wrench, but use your toilet's instructions if they specify otherwise.

Trim excess bolt length with a hacksaw and install the decorative caps.

6. Install the tank, if it's a two-piece toilet

Install the tank-to-bowl gasket and mounting hardware exactly as specified by the manufacturer. Set the tank onto the bowl, make sure it's level, and tighten the tank bolts evenly.

Again, don't overtighten—porcelain can crack.

7. Connect the water supply

Attach the supply line to the toilet's fill valve. Open the shutoff valve slowly and let the tank fill.

Check carefully around:

• The supply connection
• The fill valve
• The tank-to-bowl connection
• Both sides of the toilet base

Flush several times and continue watching for water.

8. Finish the base

If the toilet rocks, correct that with shims before finishing.

Caulking around the base is a little controversial: some manufacturers/plumbing guidance recommends it, while other installation guidance recommends leaving the rear portion uncaulked so a leak can become visible. Follow your local plumbing requirements and the toilet manufacturer's instructions.

The three biggest mistakes to avoid

1. Using the old wax ring — always use a new seal.
2. Installing over a damaged or badly positioned flange — fix the flange first.
3. Rocking the toilet after setting it — this can break the wax seal and cause a leak.

If you're replacing an existing toilet in a typical bathroom, this is generally a straightforward DIY project. If the flange is broken, the floor around it is rotten, the drain needs relocation, or the new toilet doesn't match the existing rough-in, that's where I'd stop and address the underlying plumbing rather than trying to force the installation.