Is Replacing a Toilet a DIY Project?

Quick Answer

Yes, replacing a toilet is one of the most DIY-friendly plumbing projects. It takes about 90 minutes, costs 150 to 400 dollars for the toilet plus 10 dollars for the wax ring, and saves the 200 to 400 dollar installation labor fee most plumbers charge.

The one detail that decides whether it lasts is the wax ring seal. Compress it once, evenly, and never lift the toilet again until you replace it.

What You Need

• New toilet (tank, bowl, seat, bolts usually included).
• Wax ring (standard or jumbo, jumbo if the flange is recessed below the floor).
• New supply line (braided stainless, never reuse old).
• Adjustable wrench, channel-lock pliers, hacksaw, putty knife, level, towels, sponge.
• Optional: closet bolts kit (often better than the ones in the box).

Remove the Old Toilet

1. Shut the supply valve clockwise, flush, hold the handle to drain.
2. Sponge out remaining water from tank and bowl.
3. Disconnect the supply line.
4. Unbolt the tank from the bowl (skip if your model is one-piece).
5. Pry off the bolt caps at the base, unscrew the closet bolts, rock the bowl side to side to break the wax seal, lift it off.
6. Plug the drain with a rag (sewer gas escapes if you do not).
7. Scrape off the old wax ring with a putty knife until the flange is bare.

Check the Flange

The closet flange should sit on top of the finished floor, not below it. If it is recessed, use a flange extender or a jumbo wax ring. If the flange is cracked, replace it now, this is the one issue that turns a 90-minute job into a 4-hour one. Closet flanges cost 8 to 25 dollars at any hardware store.

Set the New Toilet

1. Insert new closet bolts into the flange slots, point them straight up.
2. Remove the rag from the drain.
3. Press the new wax ring around the toilet's bottom horn (sticky side toward the toilet).
4. Lower the toilet straight down over the bolts. Do not rock. Do not tip.
5. Sit on the bowl gently to compress the wax. You should feel the toilet settle about 1/4 inch.
6. Hand-tighten the nuts onto the closet bolts, then alternate sides with a wrench until snug. Stop, porcelain cracks if you over-tighten.
7. Hacksaw off excess bolt length, snap the caps on.

Hook Up the Tank and Water

If your toilet is two-piece, lower the tank onto the bowl with the rubber gasket between them, tighten the tank bolts evenly. Connect the new braided supply line to the fill valve and then to the shutoff. Turn on water slowly. Let the tank fill, flush twice.

Check for Leaks

Dry-mop the base. Flush 5 times. Watch the floor around the base and the supply line connections. Any seepage at the base means the wax ring did not seal, you have to pull the toilet and start over. This is the price of lifting the toilet after setting it.

Caulk or Not?

Code (IPC 2021, section 405.5) requires the toilet base to be sealed to the floor. Leave a 1 inch gap at the back so a future leak is visible, and caulk the front and sides with white silicone.

Time and Savings

Total: 90 minutes once, 60 minutes the second time you do it. Materials 160 to 410 dollars. Plumber install: 200 to 400 dollars on top of toilet cost. Pure DIY savings: roughly the cost of the toilet itself.

Bottom Line

Replacing a toilet is a true DIY project. Buy the toilet, the wax ring, and a new supply line, plug the drain so sewer gas does not come up, set the bowl once without rocking, and snug the bolts without cracking the porcelain.

Common Questions About DIY Toilet Replacement

What if my floor is uneven?

Shim under the base on the low side, then trim flush with a utility knife after the toilet sits. Never tighten the bolts to pull the toilet down to the floor, you will crack the porcelain.

Do I need a new wax ring every time?

Yes. The old one is compressed and will not seal a new toilet correctly. Wax rings cost 5 to 15 dollars and are the cheapest insurance you can buy.

Standard or jumbo wax ring?

Standard if the flange sits flush with the finished floor. Jumbo (or a flange extender) if the floor is higher than the flange after new tile or laminate.

Wax or wax-free seal?

Wax is the proven 60-year solution. Wax-free seals (Korky, Fluidmaster Better Than Wax) are easier to install and reusable, fine for most installs but not yet matching wax for long-term flood resilience.

How tall a toilet should I buy?

Standard is about 15 inches to the seat. "Comfort height" or "right height" toilets are 17 to 19 inches, easier for taller users and aging knees. ADA compliant is 17 to 19 inches.

What is the gallons-per-flush rule?

Federal max is 1.6 GPF. High-efficiency toilets (HET) at 1.28 GPF qualify for WaterSense rebates and most municipal water-saving credits.