How to Install a New Toilet


  1. Introduction
  2. Tools and Materials Needed
  3. Preparation
  4. Installing the New Toilet
  5. Testing and Final Adjustments
  6. Finishing Touches
  7. FAQs


Installing a new toilet can seem like a daunting task, but with the right tools and instructions, it can be a manageable DIY project. This guide will walk you through the process step-by-step to ensure your new toilet is installed correctly and efficiently.

Tools and Materials Needed

  • New toilet (bowl and tank)
  • Wax ring
  • Closet bolts
  • Adjustable wrench
  • Screwdrivers (Phillips and flat-head)
  • Putty knife
  • Level
  • Plumber’s tape
  • Sponge or towel
  • Bucket
  • Hacksaw (if needed to trim bolts)


Turn Off the Water Supply

  • Locate Shut-Off Valve: The shut-off valve is usually located on the wall behind the toilet.
  • Turn Off Water: Turn the valve clockwise to shut off the water supply.
  • Drain the Toilet: Flush the toilet to drain as much water as possible from the tank and bowl. Use a sponge or towel to remove any remaining water.

Remove the Old Toilet

  • Disconnect Water Supply Line: Use an adjustable wrench to disconnect the water supply line from the toilet tank.
  • Remove the Bolts: Unscrew the bolts at the base of the toilet using a wrench.
  • Lift Off the Toilet: Carefully lift the toilet off the floor and set it aside. Be aware that there may be some remaining water in the trap.
  • Remove Old Wax Ring: Use a putty knife to scrape off the old wax ring from the flange on the floor. Clean the area thoroughly.

Installing the New Toilet

Install the Wax Ring

  • Position Wax Ring: Place the new wax ring on the toilet flange on the floor, or on the bottom of the toilet bowl outlet, depending on manufacturer instructions.

Position the Toilet

  • Align Toilet with Bolts: Carefully lower the new toilet bowl onto the flange, aligning the holes in the base with the closet bolts.
  • Press Down Firmly: Press down on the toilet bowl to compress the wax ring and create a good seal.

Secure the Toilet

  • Install Washers and Nuts: Place washers and nuts on the closet bolts and tighten them with a wrench. Be careful not to overtighten, as this can crack the porcelain.
  • Check Level: Use a level to ensure the toilet is level. Adjust as necessary by tightening or loosening the nuts.
  • Trim Excess Bolts: If the bolts extend too far above the nuts, trim them with a hacksaw.

Install the Tank

  • Position Tank Gasket: Place the tank gasket on the bottom of the tank.
  • Attach Tank to Bowl: Set the tank on the toilet bowl, aligning the bolts with the holes.
  • Secure Tank: Tighten the nuts on the tank bolts. Be careful not to overtighten to avoid cracking the porcelain.
  • Check Level: Ensure the tank is level and adjust if necessary.

Connect the Water Supply

  • Reattach Supply Line: Connect the water supply line to the fill valve on the tank and tighten it with an adjustable wrench.
  • Use Plumber’s Tape: Apply plumber’s tape to the threads for a secure, leak-free connection.

Testing and Final Adjustments

Turn On the Water Supply

  • Open Shut-Off Valve: Turn the shut-off valve counterclockwise to open it and allow water to flow into the tank.
  • Fill the Tank: Wait for the tank to fill and check for any leaks.

Check for Leaks

  • Inspect Connections: Check all connections, including the base, tank bolts, and water supply line, for any signs of leaks.
  • Tighten if Necessary: Tighten any connections that may be leaking, but be careful not to overtighten.

Test the Toilet

  • Flush the Toilet: Flush the toilet several times to ensure it is functioning properly and there are no leaks.
  • Check Operation: Ensure the toilet flushes and refills correctly.

Finishing Touches

  • Install Toilet Seat: Attach the toilet seat according to the manufacturer’s instructions.
  • Seal Base: Apply a bead of silicone caulk around the base of the toilet to seal it and prevent water from seeping underneath.
  • Clean Up: Clean up any debris and ensure the area around the toilet is clean and dry.


How long does it take to install a new toilet?

Installing a new toilet typically takes about 1-2 hours, depending on your experience and any potential complications.

Do I need to replace the wax ring every time I install a new toilet?

Yes, it’s essential to replace the wax ring each time you install a new toilet to ensure a proper seal and prevent leaks.

Can I reuse the old toilet bolts and nuts?

It’s recommended to use new bolts and nuts to ensure a secure installation and prevent potential issues with old, worn hardware.

What should I do if my toilet wobbles after installation?

If your toilet wobbles, you can use shims to level it. Insert the shims at the base of the toilet, then trim any excess shim material.

How do I know if my flange is in good condition?

Inspect the flange for cracks, chips, or other damage. If it’s damaged, replace it before installing the new toilet to ensure a secure and leak-free installation.

By following these steps, you can successfully install a new toilet, improving the functionality and appearance of your bathroom. If you encounter any issues or have specific concerns, don’t hesitate to seek advice from a professional plumber.

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