A good granny flat lives a lot bigger than its floor area suggests, and that comes down to the plan more than the square metres. Two builds can both land at 60 square metres and feel like completely different homes. One is open, bright and easy to move around in. The other feels like a hallway with rooms bolted onto it. Same size, very different day-to-day. The difference is almost always the layout, so it's worth getting that right on paper before anything gets built.
Start with how it will actually be lived in
Before you look at a single floor plan, picture the person moving in and how they spend a normal day. A parent downsizing wants different things from a young adult starting out, and both want different things from a long-term tenant. The granny flat house plans that work start from the person, not a template.
A few honest questions to answer first:
- One person or a couple. That decides whether you need a real second bedroom or just a study nook.
- Ageing in place. If so, wider doorways, a step-free entry and a bathroom you can move around in matter more than a second bedroom.
- How much cooking and hosting. A keen cook needs bench space and a pantry, not a token kitchenette.
- Working from home. Even a small desk zone changes where the windows and power points should go.
Answer these and the plan starts to design itself. Skip them and you end up with rooms that look fine on a drawing but fight you every day.
Let the block set the orientation
Light is free, so use it. Across Wollongong, the Illawarra and the Southern Highlands, you generally want your living areas and the main windows facing roughly north, so the kitchen and lounge get sun through the day. Bedrooms and the bathroom can sit on the cooler southern or western side where you don't need the light as much.
Look at the real block, too, not just the compass. Notice where the afternoon sun lands in summer, where the neighbour's fence throws shade, and which way the yard falls for drainage. A granny flat tucked behind an existing house often has one good aspect and one poor one, and the whole plan should be built around that good side.
Open-plan living, done with a bit of care
In a small footprint, combining the kitchen, living and dining into one open space is nearly always the right call. It borrows light and sightlines across the whole area and stops the place feeling chopped up. That's why most granny flat layouts lean open-plan.
Open-plan still needs a bit of structure, though. Push the kitchen to one end so cooking smells and clutter don't take over the lounge. Keep a clear run from the front door to the living zone rather than walking straight into the kitchen. And leave one solid wall long enough for a couch and a TV, because an open room with windows on every side gives you nowhere to put the furniture.
Storage is the thing people forget
Storage is what separates a granny flat that feels like a home from one that feels like a motel room. Small builds get away with less floor area when the storage is done properly, so plan it in early rather than adding it later.
- A built-in wardrobe in every bedroom, not a freestanding one eating floor space.
- A broom or linen cupboard in the hallway.
- Overhead cupboards and a slim pantry in the kitchen.
- A bit of external storage, even a small lockable cupboard on the deck, for tools and bins.
None of this is expensive at the plan stage. Retrofitting it after the walls are up always is.
Granny flat layouts by size: studio, one-bed, two-bed
Here's a rough guide to what fits at each size. Treat these as a starting point, not a fixed rule, because your block and council will shape the final plan.
- Studio, around 35 to 45 square metres. One open room for living and sleeping, a compact kitchen along one wall, and a separate bathroom. Good for a single occupant or a home office with a bed. A sliding partition can screen off the bed without closing the space in.
- One-bedroom, around 45 to 55 square metres. A proper separate bedroom with a built-in robe, an open kitchen and living zone, and a full bathroom. This is the layout most people picture, and it suits a parent, a couple or a tenant equally well.
- Two-bedroom, up to 60 square metres. The two bedrooms sit together down one end, the living and kitchen open up at the other, and the bathroom and laundry share a wet zone between them to save space. In NSW, a secondary dwelling is generally capped at 60 square metres of floor area, so a two-bed plan has to be efficient.
Make sure the plan can actually be approved
The nicest layout is no good if it can't get past council. In NSW, a granny flat may be able to go through as complying development, a CDC, if it meets the standards, which is usually faster than a full development application. Setbacks, that 60 square metre limit and site coverage all feed into what will fit on your block.
The rules shift depending on your zone and lot, so confirm the specifics with your local council or a private certifier before you commit to a plan. Ovas Build handles the design, the council approval and the build under one point of contact, so the layout you settle on is checked against the rules before it ever gets to site.
Get the plan right on paper and the rest of the build gets easier, cheaper and far nicer to live in.
Want a hand with this at your place? Get a free quote or call 0434 037 851.