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Is it possible to install a toilet seat with warm-water washing function in a rental apartment? Thorough explanation of types, selection, and installation procedures

Hot-water washing toilet seats can be installed in rental properties. The difference between types (hot water storage type and instantaneous type), how to choose, DIY installation procedures, and cautions are explained. We also introduce tips on how to keep costs down.

Last updated: About 4 min read

Bidet-equipped toilets are now widely available and are a popular feature that many people include in their criteria when searching for a rental property. However, if the rental property you move into doesn’t have a bidet-equipped toilet, can you install one yourself?

In this article, we’ll explain the pros and cons of heated toilet seats, the different types available, how to choose one, the installation process, and important considerations specific to rental properties.

What Are the Benefits of Installing a Bidet Toilet Seat?

Installing a bidet toilet seat offers multiple benefits in terms of hygiene, comfort, and cost-effectiveness.

Reduces Strain on the Skin

Washing with warm water eliminates the need to wipe repeatedly with toilet paper, helping to prevent skin irritation in sensitive areas. It also reduces toilet paper usage, which helps prevent clogs and cut costs.

Helps prevent infections

Rinsing away viruses and bacteria in feces with warm water before wiping helps minimize the risk of infection. It also reduces the number of germs on your hands, making it easier to maintain cleanliness.

Freedom from cold toilet seats

A warm-water bidet seat keeps the seat warm all year round. You’ll no longer have to deal with the stress of sitting on a freezing seat in winter, and you won’t need a seat cover.

What are the disadvantages of a bidet toilet seat?

There are some drawbacks you should be aware of before installing one.

Regular cleaning of the nozzle is required

The nozzle is a place where bacteria can easily breed. Choosing a model with an automatic cleaning or sterilization function can reduce the burden of maintenance.

Higher electricity costs

While fixed costs are higher than with conventional toilets, models equipped with water-saving features or automatic power-saving functions can help reduce energy consumption. In the long run, the benefits likely outweigh the costs.

What types of heated toilet seats are available?

Bidet seats are classified based on two criteria: "heating method" and "remote control type."

The difference between storage-type and instant-type

Features of the storage-type

This system stores and heats water in a built-in tank and is commonly found in basic to mid-range models. Since the hot water runs out once the tank is empty, caution is advised for households with many members.

Features of the instant-heating type

Since the water is heated instantly by a water heater, there is no risk of running out of hot water. This system is often found in high-end models and can handle continuous use.

Differences in Remote Controls

Side-Mounted Remote

This type is installed next to the toilet seat. While it’s easy to install in rental properties since it doesn’t require drilling holes in the wall, it tends to get dirty and requires space.

Wall-Mounted Remote

This type offers more features than the side-mounted remote and makes it easier to clean around the toilet seat. However, since it requires drilling a hole in the wall, it may not be installable in rental properties.

How Should You Choose a Bidet Toilet Seat?

Choose the product that suits you best based on three factors: size, price, and functionality.

Choosing by Size

Toilets come in two sizes: regular (320–350 mm) and elongated (355–380 mm). To ensure a successful installation, be sure to measure the toilet’s size accurately beforehand.

Choosing by Price

The average price for the unit itself is around 50,000 yen, and installation costs typically range from 10,000 to 20,000 yen. It’s important to choose a model that balances your budget with your needs.

Choose by Functionality

Key features include the following:

  • Anti-stain features: Stain-resistant materials, automatic nozzle cleaning
  • Warm Air Drying: Helps save on toilet paper costs
  • Auto open/close function: Prevents forgetting to close the lid and reduces heat loss
  • Auto-flush function: Prevents forgetting to flush

What should you check before installation?

Before installing a heated toilet seat, be sure to check the following two points.

Availability of a Power Outlet

A heated toilet seat requires a power source. If there is no outlet inside the bathroom, electrical work will be necessary. Using an extension cord from the hallway poses a risk of electrical leakage and electric shock, making it dangerous.

Check for Sufficient Space

Measure the distance from the center of the toilet bowl to the walls on either side, as well as the distance from the front edge of the toilet bowl to the door or wall, in advance.

How can I install a bidet toilet seat in a rental property?

Even in rental properties, retrofitting is possible if you cover the full cost yourself and obtain approval from the landlord or property management company.

Confirmation with the Landlord or Management Company is Essential

When making changes to the fixtures in a rental property, be sure to check with the landlord or property management company in advance. It’s also a good idea to confirm the requirements for restoring the unit to its original condition when you move out.

Installation costs are around 10,000 yen

The average cost for hiring a professional ranges from about 8,000 to 10,000 yen. Since there is a risk of water leaks or electric shock, we recommend hiring a professional if you’re unsure.

DIY Installation Steps

The tools you’ll need are as follows.

  • Bidet toilet seat unit
  • Phillips-head screwdriver and flat-head screwdriver
  • Adjustable wrench
  • Bucket and measuring tape

The installation procedure consists of the following 6 steps.

  1. Remove the existing toilet seat (keep the removed parts for when you move out)
  2. Install the new toilet seat (install the base plate and tighten securely)
  3. Turn off the shut-off valve and disconnect the water supply line (have a bucket ready to catch any water)
  4. Connect the branch fitting (make sure to insert the gasket)
  5. Attach the water supply hose
  6. Turn on the power and perform a test run (check for leaks, then verify operation using each switch)

Even first-time installers can complete the installation in about 30 minutes to an hour.

What should you keep in mind when installing in a rental property?

Let’s review the specific precautions unique to rental properties.

Estimate the expected usage period

Consider your moving plans and whether you’ll need to transport the unit, and choose a product grade that matches your expected usage period.

Choose a universal size

If you choose a dual-purpose size that fits both extended and standard beds, you won’t need to buy a new one when you move.

Risks of DIY Installation

In some cases, you may be charged for water leaks caused by incorrect installation of parts, or for damage to walls or the toilet bowl during installation when you move out. If you’re unsure, hire a professional.

Do not throw away the removed toilet seat

Since rental properties require you to restore the unit to its original condition, be sure to keep the removed toilet seat.

You’ll Need to Handle Repairs Yourself

If a bidet seat you installed yourself breaks down, your landlord or property management company cannot assist you. If you suspect a malfunction, first unplug the unit and then plug it back in.

Tips for installing a bidet seat on a budget

Here are two tips for keeping costs down.

Buy the unit at a low price

Online retailers often sell discontinued models at bargain prices, which is recommended for those looking to save money. The end-of-year sales at electronics retailers are also a good time to shop.

Compare installation costs

If you shop at an electronics retailer that partners with installation contractors, they can handle everything from purchase to installation. Be sure to compare the total cost, including installation fees.

Consider a portable bidet

If installation is difficult, a portable bidet is another option. These handheld devices can be used at home or on the go, and come in both electric and manual models.

Summary

Washlet toilet seats are a popular addition that can be retrofitted in rental properties with the landlord’s permission. Choose a product that suits your needs after understanding the different types, sizes, and legal regulations regarding rentals. If you’re unsure about installation, consider hiring a professional.

Frequently Asked Questions (FAQ)

Q. Can I install a bidet toilet seat myself in a rental property?

You can install one if you cover the full cost yourself and obtain prior approval from your landlord or property management company. Be sure to also confirm your obligation to restore the unit to its original condition when you move out.

Q. Which is better: a storage-type or an instant-type bidet?

For large families or environments with frequent, consecutive use, we recommend the instant-heating type to avoid running out of hot water. If you live alone and want to keep costs down, the storage-type is sufficient.

Q. How much does it cost to install a bidet toilet seat?

If you hire a professional, labor costs typically range from 8,000 to 10,000 yen. The unit price averages around 50,000 yen, but you can reduce costs by purchasing discontinued models or items on sale.

Q. What should I do if a bidet toilet seat I installed in a rental property breaks down?

If you installed it yourself, the landlord or property management company cannot assist you, so please contact the manufacturer directly. First, try unplugging and plugging the unit back in.

Daisuke Inazawa, President & CEO of INA&Associates Inc.

Author

President & CEOINA&Associates Inc.

President & CEO of INA&Associates Inc. Leads real estate brokerage, rental leasing, and property management across Greater Tokyo and the Kansai region. Specialises in income-property investment strategy and advisory for ultra-high-net-worth individuals.

Daisuke Inazawa is the President and CEO of INA&Associates Inc., a Japanese real estate firm headquartered in Osaka with a Tokyo branch. He leads the company's three core businesses — real estate sales brokerage, rental leasing, and property management — across the Greater Tokyo Area and the Kansai region.

His areas of expertise include investment strategy for income-generating real estate, profitability optimisation of rental operations, real estate advisory for ultra-high-net-worth individuals (UHNWIs) and institutional investors, and cross-border real estate investment. He provides data-driven, long-horizon advisory to investors in Japan and overseas.

Under the management philosophy "a company's most important asset is its people," he positions INA&Associates as a "people-investment company" and is committed to sustainable corporate-value creation through talent development. He also writes and speaks publicly on leadership and organisational culture in times of change.

He has passed eleven Japanese professional qualification examinations: Licensed Real Estate Broker (Takken), Certified Real Estate Consulting Master, Licensed Condominium Manager, Licensed Building Management Supervisor, Certified Rental Housing Management Professional, Gyōseishoshi Lawyer (administrative scrivener), Certified Personal Information Protection Officer, Class-A Fire Prevention Manager, Certified Auctioned Real Estate Specialist, Certified Condominium Maintenance Engineer, and Licensed Moneylending Operations Supervisor.

  • Licensed Real Estate Broker (Takken)
  • Certified Real Estate Consulting Master
  • Licensed Condominium Manager
  • Licensed Building Management Supervisor
  • Certified Rental Housing Management Professional
  • Gyōseishoshi Lawyer (Administrative Scrivener)
  • Certified Personal Information Protection Officer
  • Class-A Fire Prevention Manager
  • Certified Auctioned Real Estate Specialist
  • Certified Condominium Maintenance Engineer
  • Licensed Moneylending Operations Supervisor