Guide · owner-building
Owner-building a granny flat in Queensland.
The permit, what you can legally do yourself, the build sequence, and the honest hours, from people who assemble these for a living.
Most Queensland owners can build or finish a granny flat under a QBCC owner-builder permit: course, white card, licensed trades for electrical and plumbing, certifier inspections to a Form 21 final. Typical saving versus fully installed: about $35,000 for 300 to 400 hours of your labour.
The short version
Queensland lets most owners build or finish their own granny flat under an owner-builder permit from the QBCC. You need the permit when the work exceeds $11,000 in value, you must use licensed contractors for electrical, plumbing, drainage and gas, and the permit sticks to your title: sell within six years and you disclose owner-built work. It is genuinely doable, our kits are engineered for it, and it is also real work that rewards honesty about your skills.
Getting the permit
- Complete the QBCC owner-builder course (online, white card required first).
- Apply to QBCC with your land details; the permit names the site as well as you.
- Budget a few hundred dollars and a couple of weeks for course and processing.
What you may and may not do yourself
You may assemble frames, fix cladding and roofing, hang linings, waterproof under supervision arrangements, tile, paint, fit joinery. You may not do electrical, plumbing, drainage or gas: those are licensed trades, and your certifier will want their compliance certificates. Structural work must match the engineered drawings, which is exactly what a labelled kit and a Form 15 give you.
The sequence that works
- Approvals first: building approval through a private certifier before anything is assembled on site.
- Footings to the engineered design, then the kit: frames, roof, cladding, openings. Our crews take a Standard 8.4 to lockup in about 130 to 180 hours; allow more for your first.
- Rough-ins by licensed trades, then insulation, linings, waterproofing, tiling, joinery, finals.
- Inspections at the certifier’s hold points, ending in the Form 21 final certificate. Nobody legally lives in it before that.
The honest numbers
| Stage, owner-built | Cash cost | Your hours |
|---|---|---|
| Kit (Standard 8.4) | $59,900 | 130–180 assembly |
| Fit-out materials and licensed trades | $60,000–$85,000 | 150–250 |
| Site works and approvals | $37,000–$53,000 | coordination |
| Finished, typical | $158,800–$207,600 | 300–400 total |
When not to owner-build
If your weekends are already spoken for, if sequencing six trades sounds worse than paying for it, or if the block itself is difficult, buy the module lock-up or complete instead and keep the owner-builder permit for the landscaping. The maths of that trade is printed on the ladder.
Straight answers
Do I need an owner-builder permit for a kit?
Yes, once the work you are doing yourself exceeds $11,000 in value, which any granny flat assembly does. The QBCC course is online and the permit is site-specific.
Can I do my own wiring or plumbing?
No. Electrical, plumbing, drainage and gas are licensed trades in Queensland, and your certifier requires their compliance certificates before the final.
Does owner-building hurt resale?
Owner-built work must be disclosed for six years when selling. Done properly, with the certifier’s Form 21 and trade certificates on file, it is paperwork rather than a problem.
Where this lands on price
Every price, every way to buy, on one page.
Kit $59,900 to finished and installed, with the all-in number printed.