In much of the world a bidet is a standard bathroom fixture, while in the United States it is still treated as a luxury extra. That is changing as homeowners look for ways to cut household waste, lower utility bills, and improve daily comfort. A bidet uses a gentle stream of water for personal cleaning after toileting, either as an attachment on an existing toilet, a replacement seat, or a separate floor-mounted fixture. Before starting a bathroom upgrade, review the prep steps for related work such as installing mud flooring, because the order of trades matters when plumbing is involved.
This guide covers what a bidet actually does, what it costs, what the plumbing and electrical requirements are, and how to choose between the main types. The figures below are typical planning ranges from product catalogs and utility data, so treat them as estimates rather than quotes.
What a Bidet Does and How to Plan the Project
A bidet directs a low-pressure stream of water at the user after toileting, so cleanup does not depend on toilet paper alone. In Japan, where bathing is a long-standing daily ritual, the vast majority of homes have a toilet with a built-in bidet, and the feature has become common in hotel bathrooms across Europe and Asia. Homeowners who install one typically report using far less paper and taking fewer quick showers, which is where the savings come from.
How a Bidet Works
Bidet attachments and seats tap into the toilet’s cold water supply through a T-valve, and warm-water models mix in hot water from a tank or an inline heater. A standalone bidet is a separate basin with its own faucet, spray controls, and drain. Smart toilets build the bidet function into the toilet itself, adding seat warming, air drying, and automatic lid operation.
Hygiene and Comfort Benefits
Users consistently report that bidet cleaning feels cleaner than paper alone, which is one reason the fixtures are recommended after certain medical procedures and for people with limited mobility. A warm-water seat also removes the shock of a cold fixture on winter mornings, and the adjustable stream lets each household member set their preferred pressure.
DIY or Hire a Plumber
The scope of the job decides whether you need a professional. Attachments mount in 20 to 30 minutes with basic tools, while a standalone fixture may require a licensed plumber for supply and drain work. When you do hire help, the way you structure the project matters: the project delivery methods you choose, from design-bid-build to design-build, set the cost and the schedule before any fixture is ordered.
Types of Bidets and What They Cost
Bidets fall into four main groups: attachments, seats, standalone fixtures, and smart toilets. Each group has its own price range, installation effort, and feature set, so matching the type to your bathroom layout comes first.
| Type | Typical price | Installation effort | Notable features |
|---|---|---|---|
| Bidet attachment | $30-$150 | 20-30 minutes, DIY | Cold or warm water, basic nozzle |
| Bidet seat | $100-$600 | 1-2 hours, DIY | Heated seat, warm water, dryer |
| Standalone bidet | $300-$1,000+ | Plumber required | Separate basin, full spray control |
| Smart toilet | $1,000-$5,000+ | Plumber required | Integrated bidet, dryer, sensors |
Bidet Attachments and Seats
Attachments clamp between the toilet tank and bowl and add a nozzle under the seat, which makes them the cheapest way to test the concept. Seats replace the entire seat and add comfort features such as a heated surface, adjustable water pressure, and a warm-air dryer. Both connect to the existing toilet supply, so no drain work is involved. Look for models with a self-cleaning nozzle and a pressure regulator, because inconsistent municipal water pressure is a common source of weak spray.
Standalone Bidets and Smart Toilets
Standalone units behave like a small sink: they need floor space, a supply valve, and a drain connection, which is why they usually call for a plumber. Smart toilets combine the bidet, seat, and bowl into one fixture and are the most common choice in new construction and high-end remodels.
A bidet purchase is usually part of a larger bathroom refresh, and homeowners often tackle several upgrades at once. If window coverings are on the list, our tips for buying new blinds help you match privacy and light control to the new fixture layout.
Plumbing and Electrical Requirements
Most bidets connect to the cold water supply line behind the toilet, but the details differ by type. Planning the connections before you order avoids surprises on installation day.
Water Supply and Drainage
Attachments and seats tap into the existing toilet supply with a T-fitting and need no new drain, since waste still goes into the toilet bowl. Standalone bidets need a supply valve, a P-trap, and a drain connection, exactly like a small sink. If your bathroom lacks an accessible valve, budget for a plumber to add one.
Electrical Needs for Heated Seats
Warm-water seats, dryers, and smart toilets need a grounded electrical outlet near the toilet. A bathroom without one will require an electrician, and local code may demand a GFCI-protected circuit. Cold-water attachments avoid this entirely, which keeps the total cost low.
Checking Your Bathroom Layout
Before ordering, measure the distance from the toilet to the nearest outlet and water valve, and confirm whether the bowl is round or elongated. Seats are made to fit specific bowl shapes, and returning the wrong size costs time. Also note the height of the toilet and the clearance around the bowl; a seat with a remote adds a wall-mounted control, while a side-panel model keeps everything on the unit.
Take the time to understand what a bidet is and how it works, and why you should consider one, because feature choices drive both plumbing and electrical needs.
Costs, Water Savings, and Home Value
Upfront and Operating Costs
The purchase price is only half the story. Add installation labor, roughly $100 to $300 for a seat and $300 to $800 for a standalone unit, plus electrical work if the fixture needs an outlet. Once installed, operating costs stay low: a heated seat draws modest power, and water use per cycle is small, so annual running costs typically stay under $50.
Water and Toilet Paper Savings
Manufacturing a single roll of toilet paper consumes roughly 37 gallons of water when pulp, processing, and transport are counted. A typical bidet cycle uses about one-eighth of a gallon, and the average household goes through around 140 rolls per person per year. Bidets also reduce the need for quick showers; a five-minute shower runs about 10 gallons, while a bidet does the same cleanup with a small fraction of that. Homes with two or three occupants can expect to use hundreds fewer rolls a year, and the reduced demand for paper manufacturing shrinks the household’s indirect water footprint.
Treat the purchase as a home investment decision. Homeowners weigh the financial and practical factors the same way they would before buying a vacation home: resale appeal, running costs, and how often the feature actually gets used.
How to Compare Models Before You Buy
Features That Matter Most
- Water temperature: cold-only models are cheapest, while warm-water models need a heater or hot supply
- Nozzle position and pressure settings, including rear wash and front wash modes
- Drying function and seat heating for year-round comfort
- Self-cleaning nozzles, filters, and remote controls that add convenience
- Water and energy use: heated models draw electricity, so factor the duty cycle into your operating cost estimate
Installation Effort and Fit
Check the bowl shape, the distance from the tank to the wall, and the location of the supply valve before choosing a model. Measure twice, because most returns happen when the seat does not fit the bowl.
Approach the comparison the way you would any equipment purchase: list the jobs the item must do, set a budget, and weigh the alternatives. The same framework used when evaluating a CNC router by costs, capabilities, and workshop alternatives applies to bidet models.
Where to Buy and Getting Started
Retail and Online Options
Bidet attachments and seats are stocked by big-box home stores, plumbing suppliers, and online retailers. Standalone fixtures and smart toilets are easier to find at specialty plumbing showrooms, where you can test the controls and confirm the fit before you buy. Read return policies before ordering online, because fit issues are common and some retailers charge restocking fees on plumbing items.
Where you buy affects price, return policy, and installation support. The trade-offs of buying a lawn mower at a big-box store apply here as well: convenience and easy returns versus specialty advice and stronger after-sales service.
First Steps
- Measure your toilet bowl and check the supply valve location.
- Decide between a cold-water and a warm-water model based on your electrical setup.
- Set a budget that includes installation and any electrical work.
- Order the unit, then schedule the install or set aside 30 minutes for an attachment.
- Install the unit, test the pressure settings, and check for leaks at the T-valve connection.
Starting with a basic attachment is the lowest-cost way to test whether a bidet fits your routine. If it does, the upgrade path to a seat or smart toilet is straightforward, and the water and paper savings continue for as long as the unit is in service.