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Toilet seat fitting types

By Tom Drake | 11th February 2026 | 3 min read

  • Key points:

    • Bottom-fix toilet seat fittings are secured from underneath the toilet pan.
    • Top-fix toilet seat fittings are secured from above the pan, ideal for toilets where the area underneath can’t be accessed.
    • Top-fix fittings are usually easier to install.

Bottom-fix toilet seat fittings

Chrome bottom fix toilet seat fitting.

Bottom-fix toilet seat fittings are secured from underneath the toilet pan. The bolts drop through the two fixing holes and are then tightened from below, usually with a nut.

Bottom-fix toilet seat fittings are suitable for toilets where you can access the fixing holes from underneath. This is usually the case with open-back close-coupled toilets and traditional toilets.

If you can’t access the area underneath the fixing holes, which is common with back to wall and wall hung toilets, you won’t be able to install a bottom-fix toilet seat.

Bottom-fix toilet seat fittings are stable and often offer more room for adjustment than top-fix fittings. However, they can be trickier to install, especially if there’s limited space around your toilet.

Top-fix toilet seat fittings

Person using a screwdriver to secure a top fix toilet seat fitting to a toilet.

Top-fix toilet seat fittings are installed above the toilet pan. The bolts are inserted into the two fixing holes and then secured from above, usually with a screwdriver.

Top-fix fittings are usually used on toilets where there's no access to the area underneath the seat fixing holes, such as back to wall, wall hung, and closed-back close-coupled toilets.

Top-fix toilet seat fittings are often easier to install than bottom-fix fittings, especially in bathrooms where space is limited.

Quick-release toilet seat fittings

Person pressing the button on the front of a quick release toilet seat.

Quick-release toilet seat fittings are designed to make cleaning your toilet easier.

They feature a button that allows you to lift the seat off the toilet without needing to unscrew the fittings. This means you can easily remove your toilet seat to give your toilet a deep clean, then simply place it back on top.

Toilet seat fittings FAQs

 

How do I know which toilet seat fittings I need?

The main factor affecting which toilet seat fitting type you can choose is access to the area underneath the toilet seat mounting holes. If you can access the area underneath these holes to tighten the fittings, you can use either type. If the area beneath the mounting holes isn’t accessible, you’ll need to use top-fix fittings. When replacing an existing toilet seat, choosing a new seat with the same fitting type will help ensure it’s compatible with your toilet.

  

Which toilet seat fittings are easiest to install?

Generally, top-fix toilet seats are easier to install. Unlike bottom-fix fittings, you don’t need to secure them from underneath the toilet, which can sometimes be tricky if access is limited.

 

What type of fittings do soft close toilet seats have?

Soft close toilet seats are available with top-fix or bottom-fix fittings.

 

Can toilet seat fittings be replaced?

Yes, you can purchase toilet seat fittings separately to replace those on your existing seat.