A modular home from any maker can be installed in Queensland, but only if a certifier can approve it as a house: a Class 1a dwelling under the National Construction Code, with Australian structural engineering, WaterMark plumbing, electrical to AS/NZS 3000, an energy report and, for an import, evidence it is asbestos free. Sheds, studios, site offices and most things sold as cabins are Class 10a, not for living in, and the state says a tiny home without a dwelling's approvals is not suitable for permanent living, on wheels or not. Nobody can promise council approval: not the seller, not the installer. So the first job after buying, or better before, is to find out what the home is and who made it.
Why the class decides everything
Under the National Construction Code a building people live in is Class 1a. A Class 10a building is a non-habitable one: a shed, a garage, a carport, a studio. The two have different structural, fire, waterproofing and energy rules, and a certifier cannot approve a Class 10a structure as a home by calling it one. The whole supply chain is on the hook too: the QBCC's chain of responsibility for building products says everyone from the maker to the installer must make sure a product is fit for its purpose, so a builder cannot put in a home they know does not meet the standard.
Red flags in a listing
- "No council approval needed."
- Sold as a cabin, studio, office, expandable container or tiny home with no Class 1a paperwork.
- No Australian structural engineer's certificate.
- Taps, toilets and pipes without WaterMark, or electrical gear without Australian approval marks.
- No wind rating or tie-down design for the area.
- A seller who cannot name the factory or show homes like it approved in Queensland.
- A price far below an Australian-built home of the same size.
What a certifier will ask for
| Item | What it is |
|---|---|
| The maker and the exact model | Company name, address, model and size |
| Plans and specifications | Floor plan, elevations, materials, inclusions |
| Built as a Class 1a dwelling | A statement or certificate from the maker for this home |
| Structural engineering | Frame, tie-down and footing loads, certified by a Registered Professional Engineer of Queensland |
| Plumbing that can be connected | WaterMark certified fixtures and fittings |
| Electrical that can be connected | Wired to AS/NZS 3000 with Australian-approved parts |
| Energy report | For the climate zone; glazing, waterproofing and fire details, and a BAL if the block is bushfire mapped |
| For an import | Evidence the home is asbestos free. Asbestos is a prohibited import into Australia |
If it does not stack up
Cheapest first. The maker fills the gaps: good factories can supply engineering, compliance statements and product certificates for the exact home. An Australian engineer assesses and certifies it, sometimes with upgrades to the frame, tie-downs, plumbing or wiring. The home is used as a Class 10a building, a studio or office or storage, if council allows it, with building approval and nobody living in it. Or it is not installed, which is the honest answer on some homes and far cheaper to hear before the footings than after the crane. Bought a modular home? sets this out in full, and the install quote form asks for the compliance papers so an installer can check before quoting.
See it for your block
- Bought a modular home? The full checklist
- Get an installer to check it before quoting
- Compare homes, with what each maker publishes
Questions people ask next
Can a cabin or tiny home bought online be approved as a granny flat in Queensland?
Only if it can be certified as a Class 1a dwelling: Australian structural engineering, WaterMark plumbing, electrical to AS/NZS 3000, an energy report and, for an import, proof it is asbestos free. A Class 10a building, which most cabins and studios are, cannot be approved as a home by renaming it.
Who decides whether a bought module can be installed?
A building certifier signs off the building and council decides planning. Not the seller and not the installer. A good installer checks what was bought before quoting and says so if it cannot be approved as a dwelling.
What if the home has no paperwork?
Ask the maker for the engineering and compliance statements for the exact home, or have an Australian engineer assess and certify it with any upgrades. If neither works, it can sometimes be approved as a non-habitable Class 10a building, or it is not installed.
- Queensland Government, tiny homes FAQ (a tiny home without a dwelling's approvals is not suitable for permanent living), read October 2026
- ABCB, National Construction Code building classifications (Class 1a, Class 10a), read October 2026
- QBCC, non-conforming building products and the chain of responsibility, read October 2026
- Australian Border Force, prohibited goods: asbestos, read October 2026
- Board of Professional Engineers of Queensland (RPEQ), read October 2026