Replacing a toilet seat is one of the simplest and most achievable bathroom DIY tasks. Whether your existing seat is worn, damaged, wobbly or you simply prefer a new style, fitting a replacement takes only a few minutes and requires minimal tools.
This guide explains everything you need to know, from choosing the right seat to removing the old fittings and installing the new one safely and correctly.
Why Should You Replace Your Toilet Seat?
Toilet seats may need replacing for several reasons, including:
- Cracks, damage or discolouration
- Loose or worn fixings causing wobbling
- Upgrading to a soft-close design
- Changing the style to suit a new bathroom look
- Installing a new toilet that requires a specific seat shape
If you’ve had a new bathroom installed, your fitter will usually install the seat for you. Otherwise, replacing a seat yourself is straightforward.
Do All Toilet Seats Fit the Same?
Understanding Toilet Seat Shapes
No, toilet seats are not universal. UK toilets typically fall into three main shapes:
- Round
- D-Shape
- Square
While many modern replacement seats offer adjustable fittings, you still need to ensure the shape matches your toilet bowl.
Additional Considerations
- Soft-close seats are popular but require accurate measurements.
- Older or non-standard toilets may need manufacturer-specific seats.
- Most standard toilets use an oval or elongated shape, but contemporary designs vary widely.
To choose the right replacement, you’ll need to measure your existing toilet.
How to Measure a Toilet Seat
Measuring correctly is the most important step when buying a new seat.
Are Toilet Seats a Standard Size?
No. Because toilets come in different shapes and configurations, there is no single standard size.
Essential Measurements
Take the following measurements before purchasing:
1. Fixing Hole Distance
Measure the distance between the two fixing holes at the back of the toilet.
Common spacing is 155mm, but always double-check.
2. Toilet Bowl Width
Measure the bowl at its widest point.
3. Toilet Bowl Length
Measure from the very front of the toilet rim back to the centre of the fixing holes.
With these three measurements, you can confidently select a toilet seat that fits correctly.
Safety Steps Before Replacing a Toilet Seat
Toilets harbour bacteria, so hygiene is essential when carrying out work.
Recommended Safety Steps
- Wear rubber cleaning gloves
- Clean the seat and surrounding area before removal
- After removal, disinfect the entire toilet, especially the hinge area
- Wash your hands thoroughly with antibacterial soap when finished
These precautions help prevent contact with harmful germs.
How to Remove an Old Toilet Seat
Removing a toilet seat is usually a simple process, but the exact steps depend on the type of fixing bolts you have. There are two main types: Bottom-Fixing (traditional) and Top-Fixing (modern/concealed).
Tools You Will Need
Most toilet seats can be replaced using basic household tools:
- New Toilet Seat: Ensure it matches your toilet shape (round/D-shape/square).
- Wrench or Pliers: For stubborn nuts.
- Screwdriver: Flat-head or Phillips, depending on your existing seat’s bolts.
- Penetrating Oil (Optional but recommended): Like WD-40, for corroded bolts.
- Gloves: For hygiene.
- Cleaning Supplies: Disinfectant spray and a cloth/sponge.
Step-by-Step Instructions
Step 1: Expose the Fixings
Look behind the seat for plastic hinge caps. Use a flathead screwdriver to gently lift them. Older caps may be stiff, so work carefully to avoid damaging the porcelain.
Step 2: Loosen the Wingnuts
Under the toilet, locate the wingnuts holding the bolts in place. Use pliers to loosen them, then remove by hand.
Step 3: Remove the Seat
Lift the seat away. Some models may require unscrewing the hinges further.
If bolts are rusted:
- Apply WD-40 and wait up to 10 minutes
- If still stuck, carefully use a small hacksaw to cut through the bolts
Step 4: Clean the Toilet Surface
Once the old seat is removed, thoroughly clean the top, underside and hinge area with antibacterial spray.
How to Fit a New Toilet Seat
Fitting a new toilet seat is a straightforward DIY task that generally involves two main phases: removing the old seat and securing the new one.
Step-by-Step Instructions
Step 1: Position the New Fittings
Set the new seat’s hinge mechanism or bolt fittings over the holes in the toilet bowl. The seat may or may not be attached to the hinges yet.
Step 2: Secure the Wingnuts
Drop the new bolts (often with washers) provided with your seat through the holes in the hinge mechanism and the toilet bowl.
Step 3: Check Alignment
With the fixings still slightly loose, close the seat and lid. Adjust the position of the seat and its fixings until it is perfectly centred on the bowl and overhangs the rim evenly on all sides.
Step 4: Fit the Hinge Caps
If your new seat includes decorative or protective caps, snap them into place. Once secured, your new toilet seat should feel stable, aligned and comfortable to use.
Toilet Seat Designs and Styles
Today’s toilet seats come in an enormous variety of styles, colours and finishes. Options include:
- Traditional white seats
- Wooden or MDF seats
- Soft-close or quick-release seats
- Bright colours and contemporary patterns
- D-shaped or square designs for modern toilets
- Novelty and themed styles, including animal designs
With so many choices available, it’s easy to find a toilet seat that complements your bathroom décor.
Summary
Replacing a toilet seat is a quick DIY task that requires minimal tools and only a few simple steps. Not all toilet seats fit the same, so accurate measuring is essential before buying. After removing the old seat and cleaning the area, fitting the new seat involves securing the bolts, aligning the seat and tightening the fixings. With a wide range of shapes, styles and soft-close options available, it’s easy to update the look and comfort of your bathroom in minutes.
