A two-bedroom granny flat is one of the more useful things you can put on a block. You get a second income, a place for family, or somewhere for the kids to land when they come back from uni, all inside a footprint you already own. The tricky part is that NSW caps a secondary dwelling at 60 square metres of internal floor area, and fitting two proper bedrooms, a bathroom, a kitchen and a living space into that number takes some planning. It can be done well. It can also be done badly, and you feel the difference every day you live in it.
Here in Wollongong and across the Illawarra we build a lot of these, so here is how the good two-bedroom granny flat designs actually come together.
Working inside the 60m² limit
Sixty square metres sounds tight until you see it laid out. For reference, that is roughly the size of a small two-bedroom unit. The 60m² figure is internal living area, and covered outdoor areas like a patio or a small deck generally sit outside it, though the rules around what counts can vary, so confirm the specifics for your block with a certifier before you lock a design in.
The honest trade-off is this. Every square metre you give to a second bedroom is a square metre you take from somewhere else. So a two-bed granny flat almost always has slightly smaller rooms than a one-bed of the same size. That is fine. The goal is a layout where nothing feels wasted.
Common two-bedroom granny flat floor plans
Most 60m² two-bed plans land in one of a few shapes:
- Bedrooms at one end, living at the other. The two bedrooms sit side by side down one end, the bathroom and laundry tuck in the middle, and the kitchen and living open up at the far end. This is the workhorse layout. It keeps the private rooms away from the front door and puts the living space where the light is.
- Split bedrooms. One bedroom near the entry, the other at the back, with living in between. Good for tenants who want separation, or a home office that doubles as a guest room.
- Galley kitchen against a wall. Running the kitchen along one wall rather than as an island frees up floor for the living zone. In 60m² an island usually costs you more room than it is worth.
There is no single best plan. The right one depends on your block, where the sun falls, and where the existing house and boundaries sit.
What works, and what to avoid
A few things separate a plan that lives well from one that fights you:
- Keep the hallway short. Long internal corridors are dead space you are paying to build. The tighter the circulation, the more room lands in the rooms.
- Put the wet areas together. Stacking the bathroom, laundry and kitchen plumbing on one side keeps the build simpler and helps hold costs down.
- Do not undersize the living area. People will trade living space for a bigger second bedroom and regret it. The living room is where you actually spend your time.
- Avoid too many doors on one wall. It sounds small, but a wall with three doors gives you nowhere to put a couch or a bed.
Orientation and natural light
This one gets overlooked, and it is free. On most Illawarra and Southern Highlands blocks you want the living area and the main bedroom facing north where you can manage it, so they get sun through the day. Service rooms like the bathroom, laundry and hallway can sit on the south or the shaded side. Get the orientation right and the place feels bigger and warmer, and you spend less running heating and cooling. Get it wrong and no amount of downlights fixes it.
Storage, and the rest of the detail
In a small home, storage is not a nice-to-have, it is what keeps the place from feeling cramped. Build it in early: a proper linen cupboard, a broom cupboard, built-in wardrobes in both bedrooms, and a bit of bench and overhead in the kitchen. Retrofitting storage later is fiddly and never as neat.
On approvals, a granny flat can often go through as complying development, a CDC, rather than a full development application, which is usually the quicker path. That depends on your land and whether the design meets the standards. Treat any timeline or fee you read online as a starting point, not a quote, and check it against your own council or a private certifier.
If you have got a rough size in your head and a spot on the block in mind, that is enough to start sketching real options.
Want a hand with this at your place? Get a free quote or call 0434 037 851.