Match the bowl shape first
The single most important decision: match the bowl shape exactly. Elongated bowl needs elongated seat; round-front needs round-front. Measure your existing toilet: distance from front of bowl lip to the bolt-hole centers. 16-16.5" = round-front. 18-18.5" = elongated. Compact-elongated may use either — verify with the toilet manufacturer.
The bolt-hole spread (center-to-center across the two bolts) should be 5.5 inches on virtually all standard toilets. Some commercial and European models use 6" spread — measure to confirm.
Material options
Molded plastic (polypropylene): $15-50. Lightweight, durable, easy to clean, slippery in cold. The default modern material. Bemis 1500EC, Mayfair 18SLOWA.
Enameled wood: $25-60. Warmer feel, traditional aesthetic, slightly heavier. Holds up well but can chip at the edges over 10+ years. Bemis 200E.
Solid wood: $50-150. Premium aesthetic for traditional bathrooms (oak, mahogany, walnut). Heaviest. Needs occasional re-oiling.
Cushioned vinyl: $15-40. Padded for "soft seat" feel. Hygiene problem — punctures and tears trap bacteria. Largely fallen out of favor; not recommended for shared bathrooms.
Resin / composite: $40-120. Solid feel, anti-slip surface, often warmer than plastic. Mayfair STA-TITE.
Closing mechanism
Standard hinge (gravity drop): $15-30. Lid slams when dropped. The traditional design.
Soft-close hydraulic: $30-60. Lid closes slowly via internal damper. Eliminates middle-of-night slam wakes and lid-up-vs-lid-down arguments. The modern default for any new purchase. Lifespan 5-8 years before damper fails.
Quick-release: $30-50. Seat pops off the hinges with a side-press button — easy cleaning under the hinges. Pairs with soft-close in higher-tier seats.
Self-lowering motion-sensor: $80-200. Lid raises and lowers automatically as you approach and leave. Primarily a smart-bathroom feature.
Bidet seat (smart seat upgrade)
If you want bidet functionality but don\'t want to replace the entire toilet, a bidet seat replaces just the seat with a heated, washing version. $250-1,500. Requires a GFCI outlet within 4 feet of the toilet (most modern bathrooms have one). Top picks:
- Brondell Swash 1400: $700 — best mid-range, full-featured
- TOTO Washlet C200: $700 — best Japanese-engineering option
- Bio Bidet BB-2000: $600 — best value full-featured
- TOTO Washlet C100: $400 — entry-level Washlet
- TOTO Washlet S550e: $1,400 — luxury tier
Special considerations
Heated seat only (no bidet): Lotus Hygiene LTS-201, Brondell LumaWarm. $80-180. Adds heated seat without bidet functionality.
Anti-microbial coating: Many premium plastic seats now include silver-ion or anti-microbial coatings. Marginal benefit but not a negative.
Color matching: White is universal. For Biscuit, Almond, or other colors, order from the toilet manufacturer\'s seat line — aftermarket seats rarely match shades exactly.
Replacement frequency
Plastic standard seats last 7-10 years before warping or discoloring. Soft-close mechanisms fail at year 5-8. Bidet seats last 7-12 years depending on use. Plan to replace any seat that\'s warped, cracked, discolored, or has a failed soft-close — it\'s a $30 fix.