How to Install a Toilet: A Comprehensive Guide

Posted by ilker Duymaz on

Installing a toilet may seem daunting, but with the right tools and a bit of patience, it can be a straightforward DIY project. This step-by-step guide will lead you through the process of installing a toilet in your bathroom.

How to Install a Toilet

Tools and Materials Required:

  • Adjustable wrench
  • Screwdriver
  • Pipe wrench
  • Utility knife
  • Level
  • Tape measure
  • Wax ring
  • New toilet (pan, cistern, seat)
  • Bolts and washers
  • Plumber's putty
  • White silicone sealant
  • Cloakroom basin if required

1. Prepare the Installation Area

How to Install a Toilet

Start by ensuring the area where you plan to install the toilet is clean and free from debris. If you're replacing an old toilet, make sure you've disconnected and removed it properly. Clean the floor area and the flange to make sure they are free of old wax and grime.

2. Check the Closet Flange

The closet flange is the connecting point between the toilet and the drainpipe. Ensure it's securely attached to the floor. If damaged, it might require replacement.

3. Place the Wax Ring

Position the wax ring so that it's centred over the closet flange. This ring creates a watertight seal between the toilet and the drainpipe, preventing leaks.

4. Install the Toilet Bowl

Lower the toilet bowl onto the closet flange, aligning the mounting holes with the bolts. Apply even pressure to the toilet to compress the wax ring. Once in place, put a washer and nut on each bolt and tighten them. Be careful not to overtighten as it can crack the toilet.

5. Check for Level

Using a level, ensure the toilet bowl is perfectly horizontal. If not, you can level it by adding shims under the base. Once levelled, trim any excess shim material with a utility knife.

6. Attach the Cistern

Place the cistern onto the bowl, aligning the mounting holes. Using bolts, nuts, and washers, secure the cistern to the bowl. Ensure it's tightened securely but be cautious not to overtighten.

7. Connect the Water Supply

Using a pipe wrench, connect the water supply line to the fill valve at the base of the cistern. Turn on the water and let the cistern fill, checking for any leaks at the base and the water connection.

8. Install the Toilet Seat

Follow the manufacturer’s instructions to attach the toilet seat. Typically, this involves aligning the seat with the bowl's mounting holes and tightening with screws.

9. Seal the Base

Apply a bead of white silicone sealant around the base of the toilet where it meets the floor. This prevents water from seeping underneath.

10. Final Checks

Flush the toilet several times to ensure it's working correctly. Check for leaks around the base, the cistern, and the water supply connection. Ensure the toilet remains level, and there's no wobbling.


Installing a toilet is a rewarding DIY task that can save you substantial plumber fees. However, if you encounter challenges or feel unsure at any stage, it's advisable to consult a professional. Remember, a well-installed toilet not only serves its function but also prevents potential water damage to your bathroom.

For more guides on maintaining your bathroom's best state, explore our articles on topics ranging from fixing a running toilet to removing limescale effectively.

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