Yes—you can absolutely install a bidet or smart toilet in a bathroom renovation in Sydney, and it’s becoming increasingly common in modern upgrades. However, there are important plumbing and compliance rules you need to follow to ensure it’s legal and passes inspection.
Here’s what you need to know.
🚿 Can you install a bidet or smart toilet during renovation?
Yes. In most Sydney bathroom renovations, you can install:
Bidet toilet seats (retrofit onto existing toilets)
Handheld bidet sprays
Fully integrated smart toilets with built-in bidet functions
Heated seats, dryers, and sensor-operated systems
These are all permitted—but they must be installed correctly by licensed trades.
⚠️ What makes it “legal” in Australia?
In NSW, bidets and smart toilets are treated as high-risk plumbing fixtures because they connect to potable water.
That means installation must comply with:
AS/NZS 3500 plumbing standards
Backflow prevention requirements
WaterMark-certified products only
Licensed plumbers are required to ensure there is no risk of contaminated water flowing back into the drinking supply.
🔧 Backflow prevention is the key compliance issue
This is the main legal requirement that surprises most homeowners.
Depending on the system, your plumber may need to install:
An air gap, or
A high-hazard backflow prevention device (RPZ valve or equivalent)
This prevents wastewater from entering the clean water supply.
In simple terms:
👉 Your bidet must never be able to contaminate your home’s water system.
🏗️ Can it be added during a renovation easily?
Yes—and renovations are actually the best time to install one because:
Plumbing is already exposed
Electrical points can be added for smart toilets
Waterproofing and tiling can accommodate changes cleanly
Costs are lower than retrofitting later
Smart toilets are often installed during the fit-off stage, after waterproofing and tiling but before final completion.
⚡ Do smart toilets need electricity?
Most modern smart toilets require:
A nearby GPO (power outlet)
Sometimes a dedicated circuit for higher-end models
This must be installed by a licensed electrician, especially in wet areas.
🧠 Common mistakes to avoid
Many installation issues happen when homeowners:
Try DIY installation (not compliant in NSW)
Buy non-certified bidet attachments
Ignore backflow requirements
Install without considering space and plumbing layout
Even if the product works, it may still fail inspection if not compliant.
👍 Benefits of installing one during renovation
Adding a bidet or smart toilet during your renovation gives you:
Cleaner, more hygienic bathroom experience
Higher resale appeal (modern upgrade feature)
Better accessibility for aging in place
Reduced toilet paper usage
Seamless integration into design
🧾 Bottom line
Yes—you can install a bidet or smart toilet in your bathroom renovation in Sydney, but it must be:
Plumber-installed
Backflow compliant
AS/NZS certified
Properly planned during construction stages
What’s Next?
If you’re renovating your bathroom, a bidet or smart toilet is best planned early so plumbing, electrics, and waterproofing are all coordinated correctly.
Contact our Sydney team today to find out other renovation services.
