How to Replace a Toilet Seat – A Simple Guide by GladPro Plumbing Services

GladPro Plumbing Services
Sep 27, 2025
3 min read

Serving Gravesend | Kent | Essex | South East London

A person wearing gloves inspects an open toilet in a bathroom. The setting is mostly white, with no visible text or designs.

Replacing a toilet seat is a quick and easy DIY task that can give your bathroom a fresh look and improve comfort and hygiene. At GladPro Plumbing Services, we’re here to offer professional advice and hands-on help for all your plumbing needs—big or small. Whether you live in Gravesend, Kent, Essex, or South East London, our expert team is just a call away.

Here’s a simple, step-by-step guide to help you replace your toilet seat properly. Or, if you’d prefer a professional touch, you can always give us a call to do the the job for you.

🧰 Tools You'll Need:

A new toilet seat (ensure the correct size and shape)
Tape measure
Screwdriver (flathead or Phillips)
Adjustable pump pliers
Protective gloves
Disinfectant cleaner and cloth
WD-40 or similar (for stubborn bolts)
Small hacksaw (for extreme cases)

🔧 Step-by-Step: How to Replace a Toilet Seat

1. Measure Your Toilet Bowl

Before buying a new toilet seat, measure:

Length – From the centre of the bolt holes to the front of the bowl
Width – At the widest point
Bolt Hole Spacing – Usually around 5.5 inches (UK standard)

Check if your toilet is round, elongated, or D-shaped. Choosing the right size ensures the new seat fits securely.

2. Remove the Old Seat

Locate the two bolts at the back of the seat (usually under plastic covers).
Pop the covers off using a flathead screwdriver.
Use a wrench or pliers to loosen the nuts underneath the bowl.
Lift off the old seat once bolts are removed.

Tip: If bolts are rusty, apply penetrating oil and wait 10–15 mins.

3. Clean the Area

This is the perfect time to give your toilet rim a thorough clean:

Use disinfectant spray and a cloth.
Wipe away any grime or buildup from around the bolt holes.
Dry the surface before installing the new seat.

4. Install the New Seat

Align the new seat’s hinges with the bolt holes.
Insert the new bolts and tighten the nuts underneath by hand.
Use a screwdriver to secure the bolts from the top while stabilising the nuts underneath.
Snap on plastic bolt covers if included.

5. Test & Adjust

Open and close the lid to check for smooth movement.
Sit on the seat to ensure it’s stable.
If wobbly, loosen slightly, adjust position, and retighten.

💬 Common Questions

Q: How do I know what seat fits my toilet?

Measure your toilet bowl! Toilets are not one-size-fits-all.

Q: What if my bolts are stuck or rusted?

Apply WD-40. If that fails, carefully cut bolts using a hacksaw.

Q: Why is my new seat still wobbly?

Check for loose bolts, uneven tightening, or incompatible seat shape.

Q: Should I get a soft-close toilet seat?

Absolutely! Soft-close seats reduce noise, prevent damage, and are safer for children.

💡 Don’t Fancy Doing It Yourself?

If you’d rather leave it to the experts, GladPro Plumbing Services is here to help. We provide fast, reliable, and affordable plumbing services throughout Gravesend, Kent, Essex, and South East London.