How to Replace a Toilet Seat
Remove your old toilet seat and install a new one
What You'll Need
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Tools
Adjustable wrench or pliers
Flathead screwdriver
Penetrating oil(optional)
For stuck bolts
Towels/rags
Materials
Step-by-Step Instructions
Identify your toilet bowl shape
2 minutes
Measure from the seat bolts to the front of the bowl. Round bowls are about 16.5 inches, elongated are about 18.5 inches. Purchase the correct seat shape.
Pro Tip
Most toilet seats are labeled as round or elongated on the packaging.
Remove the old seat
5-10 minutes
Locate the two bolts at the back of the seat. Pry off plastic caps if present. Unscrew the bolts from below using a wrench while holding the nut on top. If stuck, apply penetrating oil and wait 10 minutes.
Pro Tip
Some seats have plastic wing nuts that can be unscrewed by hand.
Clean the mounting area
2 minutes
Wipe down the bolt holes and surrounding area with a disinfecting cleaner. Remove any buildup or debris.
Position the new seat
1 minute
Align the seat holes with the toilet bowl holes. Insert the bolts from above through the seat hinges and into the bowl holes.
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Track This Project FreeTighten the bolts
2 minutes
Hand-tighten the nuts first, then snug with a wrench. Tighten evenly on both sides. Don't overtighten - this can crack the porcelain.
Warning
Over-tightening is the most common cause of cracked toilets during seat installation.
Test the seat
1 minute
Sit on the seat and check for wobble. If it moves, tighten the bolts slightly more. The seat should be stable but not cranked down excessively tight.
Common Mistakes to Avoid
- Buying wrong size (round vs elongated)
- Overtightening and cracking the toilet
- Not using included rubber washers
- Forgetting to pry off plastic caps before unscrewing
Safety Warnings
- Clean the toilet before starting for sanitary reasons
When to Call a Professional
If the toilet is cracked, if bolts are completely corroded into the porcelain, or if you notice water leaking at the base.
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Frequently Asked Questions
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Project Overview
- Difficulty
- Beginner
- Time
- 10-15 minutes
- Est. Cost
- $15–$50
- Tools
- 4 items
- Materials
- 2 items
- Steps
- 6
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