How to Replace a Toilet Seat — Step by Step
It's one of the easiest DIY plumbing jobs you can tackle at home. Here's a complete guide — plus when you should call a pro instead.
When It's Time for a New Seat
Toilets can last a decade or longer before needing replacement. But the seats attached to them rarely last anywhere near that long. The average toilet seat makes it around five years before developing cracks, instability, or hopelessly bad stains.
The good news? Replacing a toilet seat is one of the simplest DIY plumbing tasks any homeowner can handle. Here's how to do it right.
Clean & Sanitize
Safety FirstBefore breaking out the measuring tape or heading to the store, take one important preliminary step. Clean your toilet seat and bowl carefully to remove bacteria and other germs.
Wear nitrile gloves to protect against pathogens without risking allergic reactions that sometimes accompany latex exposure.
Remove the Old Seat
Two Bolts, That's ItThe seat is held on by two bolts in the back of the toilet. They're often covered by plastic caps.
- Pop off the plastic covers hiding the bolt heads.
- Find the nuts on the underside of the toilet.
- Remove the nuts and pull the bolts through from the top.
- If hardware is metal instead of plastic, a socket wrench may be needed.
- Dispose of the old seat properly.
Measure the Bowl
Don't Assume — MeasureToilet bowls come in standard sizes, but it's still important to check before buying. Take three measurements to ensure a snug, safe fit:
📏 Standard vs. Non-Standard
The standard bolt-to-bolt width is 5.5 inches, but non-standard toilets do exist. Always measure before buying — a trip back to the store is never fun.
Choose a Style
More Options Than You'd ThinkThere are two basic shapes — but modern toilet seats come with a surprising range of features and finishes:
Rounded
Standard shape — fits most compact toilets and smaller bathrooms.
Elongated
Longer, more comfortable shape — common in newer homes and remodels.
Quiet-Close
Soft-closing hinge prevents slamming — great for shared bathrooms.
Easy-Clean Materials
Some materials resist stains and bacteria better than others.
Install the New Seat
The Easy PartYour new seat should come with pre-attached hinges and fresh hardware. Installation takes about two minutes:
- Place the seat so the bolt holes align with the toilet holes.
- Drop the bolts down through from the top.
- Thread the nuts on from underneath until hand-tight.
- Close the plastic covers over the bolt heads.
- Done! Test the seat to make sure it's stable and secure.
💡 Pro Tip
Don't overtighten the nuts. Hand-tight is perfect. Over-tightening can crack the porcelain toilet bowl — and that's a much bigger (and more expensive) problem.
Toilet Seat? DIY. Toilet? Call a Pro.
Although just about any homeowner can swap out a toilet seat, changing the entire toilet is not a DIY job. It involves disconnecting water lines, removing and replacing wax seals, and ensuring proper alignment — all things that require professional expertise.
DIY — Toilet Seat
- Remove two bolts
- Measure the bowl
- Drop in the new seat
- Hand-tighten nuts
- Done in 10 minutes
Call a Pro — Full Toilet
- Water line disconnect
- Wax seal replacement
- Flange inspection
- Proper alignment
- Code compliance
We've Installed Countless Toilets Since 1951.
Don't just search "plumber near me." Call the team that Whatcom and Skagit County homeowners have trusted for over seventy years. We'll get your new toilet installed right — the first time.