The two bidet attachment types and what each install requires
Non-electric (water-only) bidet attachment: bolts to your existing toilet bowl between the bowl rim and the seat. Tees into the cold-water supply line. No electrical work needed. Install: 30-60 minutes DIY for handy homeowners; $80-150 professional. Tubes $50-180 for the attachment itself (Tushy, Luxe Bidet, Brondell SimpleSpa).
Smart bidet seat (electric, heated, with electronic controls): replaces your current toilet seat. Needs a GFCI outlet within 4 feet. Tees into the supply line for water. Install: 60-90 minutes professional (electrician + plumber); $150-400 if outlet exists, $400-800 if a new outlet is needed. Seat $250-1,500 (TOTO Washlet, Brondell Swash, Bio Bidet BB-2000).
Cost breakdown
| Scenario | Parts | Install labor | Total |
|---|---|---|---|
| Non-electric DIY | $50-180 | $0 | $50-180 |
| Non-electric professional | $50-180 | $80-150 | $130-330 |
| Smart seat (existing GFCI) | $250-1,500 | $150-350 | $400-1,850 |
| Smart seat (new GFCI needed) | $250-1,500 | $400-800 | $650-2,300 |
| Standalone bidet (separate fixture) | $300-1,500 | $500-1,500 | $800-3,000 |
What\'s included in professional install
- Removal of existing seat or attachment
- Inspection of cold-water supply and shutoff valve
- Installation of new bidet attachment or seat with all included hardware
- Installation of new supply tee (or T-fitting)
- Electrical hookup to GFCI (smart seats only)
- Initial setup and programming (water pressure, temperature, oscillation patterns)
- 30-60 day support call
Common questions
Does my toilet need to be compatible? Almost all standard residential toilets work. Verify bowl shape (round or elongated) matches the bidet model. One-piece, two-piece, smart toilets all accept attachments — though some smart toilets already include integrated bidet functionality (no attachment needed).
Will it affect my plumbing? The attachment tees into the existing cold-water supply line. No drain modification. No effect on toilet flush performance.
Do I need a new outlet for non-electric models? No — non-electric models use water pressure alone and need no electricity.
Are they hygienic? Higher-end models (TOTO Washlet, Brondell Swash) include self-cleaning wand cycles. Entry-level attachments require periodic manual cleaning of the spray nozzle.
Best models by intended user
Budget DIY (under $100): Tushy Classic, Luxe Bidet Neo 120.
Mid-range non-electric ($100-200): Brondell SimpleSpa, Luxe Bidet Neo 320, Astor.
Premium smart seat ($400-800): TOTO Washlet C200, Brondell Swash 1400.
Luxury smart seat ($1,000-1,500): TOTO Washlet S550e, Bio Bidet Discovery DLX.