Building a Granny Flat in Brisbane? Here's What's Changing in 2026

A secondary dwelling - commonly called a granny flat - is a self-contained home built on the same lot as your existing house. It needs its own kitchen, bathroom and living space, but it can't be subdivided or separately titled: it stays under the one ownership as the main residence. Since 2022, Queensland has also removed the old restriction that secondary dwellings could only house family members, which means a compliant secondary dwelling can now be rented out to anyone. For a lot of homeowners, that shifts the conversation from "a place for mum and dad" to a genuine investment decision.

In metropolitan Brisbane, Brisbane City Council currently caps a secondary dwelling at 80m² of gross floor area (a little more on larger rural-zoned lots), and it needs to sit within about 20 metres of the primary dwelling to keep its secondary dwelling status rather than being treated as a separate dual occupancy. Many compliant designs can proceed as accepted development - meaning no separate development application - but a building approval from a private certifier is still required in every case. Council overlays such as flooding or character precincts can change that picture, so the one thing worth doing before you fall in love with a floor plan is checking your specific lot against council's current mapping.

Queensland is rolling out its first overhaul of statewide house and secondary dwelling design standards in more than 15 years. The new Queensland Housing Code commences 1 September 2026, replacing planning provisions that hadn't been meaningfully updated since 2010. Local councils, including Brisbane, get a three-year window to adopt it, so today's rules remain the ones that apply for now - but it's a sign that Queensland is moving toward more consistent, modern standards for secondary dwellings across the state. Worth keeping an eye on if you're planning ahead rather than building this year.

Everything above is a general guide, not a substitute for official confirmation. Council requirements are specific to each lot, subject to change, and ultimately confirmed by Brisbane City Council and your certifier - not a blog post. That's exactly the gap a turnkey package is designed to close. With Saltair, planning and approvals are handled in-house as part of the one process, alongside design, manufacture, delivery and installation - so you're not left coordinating between council, a certifier and a builder on your own, and nothing falls through the cracks between them.

A secondary dwelling is a smaller build, but it carries the same complexity as any construction project - approvals, trades, weather, and a site that's usually still someone's lived-in backyard. Modular construction is built for exactly that kind of job. Your home is manufactured in a controlled factory environment while your site works happen in parallel, rather than in sequence, which shortens the time your property is a construction zone. Because it's built off-site under one roof, quality control stays consistent from the first module to the last - no waiting on a rotating cast of subcontractors for a small job. At Saltair, that's what we mean when we say all in-house, all in control: design, manufacture, delivery and installation are managed under the one roof, so what you're quoted is what gets delivered.