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QDC MP 4.5 / NCC 2022 requirements for bathrooms and internal wet areas

Updated: Nov 27

The state government has advised that updates to the Queensland Development Code will support the implementation of the NCC 2022 and Modern Homes standards.

Infographic QDC MP 4.5 wet areas

To streamline building approvals, add plan details / provide a bathroom layout showing shower type, floor waste location and fall.

Highlight if design is to Housing Provisions Part 10.2 (NCC 2022) or AS 3740 (2021).

Q: When designing a bathroom, where can I check what's required?

A: Review QDC MP 4.5 requirements alongside NCC 2022 legislation and Livable Housing Standard. Detail plans accordingly to clearly identify compliance with the code.

Q: Where a floor waste is installed (outside a shower, WC or laundry), are there alternatives to having to provide fall to the floor waste?

A: Yes, refer to QDC MP 4.5 AO5.

QDC MP 4.5 diagram for waterproofing

Any area separated from the shower area may not need to be graded – as per QDC MP 4.5. See diagram A5(5) for general information and apply acceptable solutions list for A5 (on p19) for requirements.

Learn more

infographic grading to floor waste

Fielding client questions?

Design professionals and builders, download the checklist - Master Builders Guide for Livable Housing Documentation.

Download PDF • 187KB

For internal wet areas, each part of the design must comply. For example, Part 5 on page 19 of the QDC MP 4.5 relates to performance criteria so is similar to a deemed to satisfy (DTS). Then A5 outlines acceptable solution conditions (ie how this might be done).

BA&A infographic legislative layers
Applying layers of legislation - check Queensland requirements / exemptions alongside NCC 2022.

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Get in touch with our residential specialist certifiers via or on 07 3265 4114 if we can clarify further.

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