how to install a toilet

How to Install a Toilet

Installing a toilet is a straightforward DIY project if the flange, floor, and water line are in good shape. The basic process is: remove the old toilet, clean the flange, set a new wax ring, place the new toilet, tighten it down, reconnect water, and test for leaks.

Quick Scoop

A clean, level installation matters more than force. The most common mistakes are reusing damaged parts, overtightening the bolts, and skipping the leak test.

What You Need

• Adjustable wrench.
• Screwdriver.
• New wax ring or approved seal.
• Closet bolts.
• Level.
• Shims if the floor is uneven.
• New supply line if the old one is worn.

Step By Step

1. Turn off the water and flush the toilet to empty the tank and bowl.

2. Disconnect the supply line and remove the old toilet.

3. Scrape away the old wax and inspect the flange for cracks or looseness.

4. Install new closet bolts in the flange.

5. Set the wax ring on the toilet or flange, then lower the toilet carefully into place.

6. Press down evenly, then tighten the nuts gradually and alternately so the bowl stays level.

7. Reconnect the water line, turn the water back on, and flush several times while checking for leaks.

8. Add shims if the toilet rocks, trim excess, and install the seat.

Important Checks

Do not overtighten the bolts, because porcelain can crack. If the toilet leaks at the base after flushing, the wax ring likely needs to be reset. Some guides suggest caulking the base, while others leave a small gap so future leaks are easier to spot.

When To Call A Pro

If the flange is broken, the floor is rotten, or you are moving the toilet to a new location, a plumber is usually the safer choice. Those situations can require repairs beyond a basic replacement.

Bottom line: for a standard replacement, the job is very doable with careful alignment, light tightening, and a thorough leak check.