Replacing a toilet is a common plumbing project that many homeowners can complete in a few hours using basic tools. A new toilet can solve chronic problems with flushing and clogs, and reduce water use at the same time.
To replace a toilet, you typically remove the old fixture, clean the area, install a new wax seal, and secure the new toilet to the floor flange. Start by reviewing the steps below to understand the process before beginning the installation.
Quick Answer
To replace a toilet, shut off the water supply, remove the old toilet, install a new wax ring, set the new toilet onto the flange, and reconnect the water supply. When you have all the materials on site, the entire process usually takes about 2 hours.
Common Reasons to Replace a Toilet
Homeowners typically replace a toilet for several reasons:
- Cracked tank or bowl
- Chronic clogging problems
- Frequent repairs on an aging toilet
- Upgrading to a water-efficient model
- Bathroom remodeling or fixture upgrades
Modern toilets also use far less water than older models, which can cut your water bill.
Tools & Materials
You may need:
- Adjustable wrench
- Screwdriver
- Putty knife
- Sponge or towels
- Bucket
- Replacement wax ring or seal
- New closet bolts
- Supply line (optional replacement)
- Rubber gloves
Having a helper nearby can make lifting and positioning the toilet easier.
Step-by-Step: How to Replace a Toilet
1. Shut Off the Water Supply
Turn the shutoff valve clockwise to stop water flow to the toilet.
Flush the toilet and hold the handle down to drain as much water as possible from the tank and bowl. Use a sponge to remove any remaining water.
2. Disconnect the Water Supply Line
Use an adjustable wrench to disconnect the supply line from the bottom of the tank.
Place a small bucket or towel underneath to catch any remaining water.
3. Remove the Old Toilet
Pry off the decorative caps at the base of the toilet and remove the mounting nuts and washers.
Gently rock the toilet to break the old wax seal, then lift the toilet straight up and set it on towels or cardboard.
4. Remove the Old Wax Ring
Use a putty knife to scrape away the old wax ring from the flange and the toilet outlet.
Inspect the flange carefully to make sure it is secure and not damaged. If it’s damaged, see How to Repair a Toilet Flange.
5. Install a New Wax Ring
Place the new wax ring onto the flange or the toilet outlet according to the manufacturer’s instructions.
Install new closet bolts if necessary.
6. Set the New Toilet
Carefully lower the toilet straight onto the flange, aligning the closet bolts with the holes in the base.
Press down firmly to compress the wax ring and create a watertight seal.
7. Secure the Toilet
Install washers and nuts onto the closet bolts.
Tighten each side gradually until the toilet sits securely on the floor. Avoid over-tightening, which can crack the porcelain.
8. Reconnect the Water Supply
Reconnect the supply line and turn the shutoff valve counterclockwise to turn the water supply back on.
Allow the tank to fill, and flush several times to check for leaks.
9. Caulk the Base (Optional)
For a tidy appearance, you can apply a thin bead of bathroom caulk along the front and sides of the toilet base.
Leave the rear edge unsealed so any future leaks remain visible.
When Installation Problems Occur
If the new toilet does not sit securely or leaks happen after installation, the issue may involve:
- Damaged toilet flange
- Uneven flooring
- Improper wax ring compression
- Incorrect flange height
These problems may require flange repair or floor adjustments before reinstalling the toilet.
Preventing Future Installation Problems
To ensure a reliable installation:
- Always install a new wax ring when replacing a toilet
- Replace corroded mounting bolts
- Inspect the flange before installing the new fixture
- Avoid rocking or shifting the toilet after installation
These steps will help the toilet maintain a leak-free seal and remain stable.
To Hire a Plumber…
If the repair turns out to be more complicated than expected, you can always find a plumber near you.
For hiring advice, see Trade Secrets for Hiring the Right Plumber.
Related Articles
If you’re not sure what’s causing the problem, see our
Toilet Repair and Troubleshooting Guide for a complete diagnostic overview.
