Need more space at home but not sure which way to go?
It’s a question we get asked all the time here in South East Queensland: should you build a granny flat or extend your existing home?
Both are great options — but they’re treated very differently by council, and the right choice depends on what you’re trying to achieve.
Let’s break it down.
What’s the Actual Difference?
It often comes down to one thing: a kitchen or laundry.
If your new build includes a full kitchen or laundry, council will generally classify it as a secondary dwelling — what most people call a granny flat.
Without those, you may actually be building a detached house extension instead.
It sounds like a small detail, but it makes a big difference to the rules you’ll need to follow.
Granny Flats: Self-Contained Living
A granny flat is a fully self-contained home, complete with its own kitchen, bathroom and living areas.
The big advantage? You can now legally rent it out anywhere in Queensland, making it a fantastic income stream and a boost to your property value.
The trade-off is that secondary dwellings come with more council rules. Expect requirements around:
- Maximum size (usually 50–100m² here in SEQ)
- Setbacks from boundaries and your main home
- Site cover limits
- Additional car parking — usually 1–2 extra spaces
If renting out or housing a loved one independently is your goal, a granny flat is almost always the way to go.
House Extensions: Fewer Rules, Less Independence
A detached house extension is treated more like an addition to your existing home.
The upside is that the rules are often far more relaxed. With a house extension you’ll typically find:
- No additional car parking required
- No maximum dwelling size limits
- No restrictions on the number of bedrooms
That makes an extension a great option if you simply need more room — a teen retreat, a home office, a studio or guest space — without the full independence of a separate home.
The catch? Because it isn’t self-contained, you generally can’t rent it out as a standalone tenancy.
Attached or Detached?
Both granny flats and extensions can be attached to your main home or built separately in the backyard.
Just keep in mind that if your new build is attached — or within 1.8m of the main dwelling — you’ll need some form of fire separation between the two, often a fire (or party) wall.
Attached builds can also cost a little more, as your builder needs to carefully tie the two homes together, sometimes altering your existing roofline to suit.
So, Which Should You Choose?
Ask yourself a few quick questions:
- Want to rent it out or create a fully independent home? Lean granny flat.
- Just need more space for family? An extension might be simpler.
- Worried about strict size or parking rules? An extension offers more freedom.
- Focused on rental income and resale value? A granny flat usually wins.
There’s no one-size-fits-all answer — it all comes down to your needs, your property and your goals.
Not Sure? Let’s Work It Out Together
The good news is you don’t have to figure it out alone.
We’ve been designing both granny flats and house extensions across South East Queensland for 6+ years, and we know exactly how to navigate council rules for each.
Tell us what you’re hoping to achieve and we’ll help you choose the right path.
Call our friendly team on 1300 649 741 or email hello@funkylittleshack.com.au today.