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How to Replace a Toilet Seat?
Updated Home Repair & DIY
What you need
- A new toilet seat (measure first — see below)
- A screwdriver or wrench (sometimes not needed)
Finding the correct replacement seat
| Measurement | How to take it | Why it matters |
|---|---|---|
| Bowl shape | Look at the bowl outline | Round vs elongated (oval) — the two main shapes, not interchangeable |
| Bowl length | Bolt holes to the front edge of the bowl | Confirms round (~16.5") vs elongated (~18.5") |
| Bolt spacing | Distance between the two bolt holes | Almost always ~5.5 inches (standard), but worth confirming |
Do replacement seats fit all toilets? No — this is the main reason a new seat doesn't fit right out of the box. Round and elongated bowls need different seat shapes, and while bolt spacing is standardized at about 5.5 inches on the large majority of toilets, always measure your specific bowl rather than assuming.
Step-by-step (standard visible bolts)
- Find the seat bolts at the back. They're usually hidden under small plastic caps/covers. Flip the caps up or open with a flat screwdriver.
- Unscrew the old seat. Turn the bolts counter-clockwise. Hold the nut underneath with a wrench or your fingers if the bolt spins. Old plastic bolts can sometimes just be twisted off by hand.
- Remove the old seat and clean. Lift it off and clean the newly exposed area around the bolt holes, which is usually grimy.
- Position the new seat. Line up the new seat's bolt holes with the holes in the bowl.
- Insert and tighten the bolts. Drop the bolts through, thread on the nuts underneath, and tighten until snug — don't overtighten, especially with plastic hardware, or you can crack the seat or bowl.
- Check it's centered and secure, then snap any bolt caps closed.
Uninstalling a seat with hidden fixings: some newer seats use a top-mount or "quick-release" system instead of visible nuts underneath. Look for a small button, lever, or slide-lock on top of the bolt covers — pressing or sliding it releases the seat from above without needing to reach underneath the bowl at all. Check the seat's own manual or the manufacturer's site if you can't find the release, since the mechanism varies by brand.
Tip: If the old bolts are rusted and won't budge, a little penetrating oil or carefully cutting the bolt with a hacksaw will free it.
Slow-close hinges: most seats sold today use a slow-close hinge system, which lowers the seat and lid gently instead of slamming — if your old seat didn't have this and you want it, check that the new seat's box specifically says "slow-close" or "soft-close," since standard hinges are still sold alongside them and look similar from the outside of the box.
Wood vs plastic seats: plastic (usually molded polypropylene) seats are lighter, cheaper, and more resistant to cracking from overtightening; wood or wood-composite seats feel sturdier and often look better in a finished bathroom but are more prone to cracking if the mounting bolts are overtightened, so go extra gentle on the final tightening step with a wood seat specifically.
Two similar answers: How to Reset a Honeywell Thermostat? and How to Unclog a Toilet With a Plunger?.
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