Fitting a flat behind a Wollongong house
Wollongong has a bit of everything. Older fibro and brick homes sit on the blocks around the city and the suburbs closest to it, and newer houses climb the slopes toward the escarpment. Plenty of those older lots still have the house near the street and open yard behind it, which is the easy case: the flat goes at the rear, with its own path down the side and enough distance from the main house that both keep their privacy.
The harder blocks are the ones where the yard falls away, or where a pool, a big tree or the sewer line sits right where the flat would go. On those we work out the position first and draw the plan second. A flat placed badly costs you garden, light and resale appeal for as long as it stands, so this is the part of the job worth the most care.
Which approval your lot needs
There are two ways a granny flat gets approved in Wollongong.
- Complying development (CDC). If the lot is at least 450 square metres, the flat is no more than 60 square metres inside, and the design meets the state setback and height rules, a private certifier can approve it. This is usually the faster path.
- Development application (DA). Lots that miss one of those standards, or that carry a flood, bushfire or heritage notation, go to Wollongong City Council instead.
Either way the new dwelling needs a BASIX certificate, which sets the insulation, glazing and water targets it has to meet. We handle the drawings, the engineering, the BASIX assessment and the application, and you get one person to call about all of it.
What moves the price on a Wollongong block
The floor plan matters less to the cost than most people expect. These matter more:
- the fall across the site, which decides between a slab and a raised floor
- access for machinery and deliveries, especially on narrow side paths
- how far the flat sits from the existing sewer and stormwater connections
- trees, retaining walls or old structures that have to come out first
We look at all of it on the first visit, then price it once as a fixed proposal. The number covers design, approval and construction, so there are no allowances that grow halfway through.
Built by a Wollongong team
Ovas Build is a licensed builder based in Wollongong with more than ten years in residential work. The same team runs your flat from the site visit to handover, and you deal with one point of contact the whole way. If you want to compare layouts before we meet, the granny flat designs page has the studio, one and two-bedroom shapes we start from.
Questions from Wollongong
Can I build a granny flat on my block in Wollongong?
Many residential lots in Wollongong can, as long as the flat fits the setbacks. The faster complying development path needs a lot of at least 450 square metres, and the flat is capped at 60 square metres of internal floor area. The planning certificate for your lot shows any flood or bushfire notation that changes the path, so we read it before the first drawing.
Does a granny flat in Wollongong have to go to council?
Not always. A flat that meets the state standards is approved as complying development by a private certifier, often in around 20 days once the application is complete. A flat that falls outside those standards goes to Wollongong City Council as a development application, which takes longer. We prepare the drawings and documents for whichever path your lot needs.
How much does a granny flat cost in Wollongong?
We price each one after seeing the block, because slope, access and the run to the sewer move the cost more than the floor plan does. You get a fixed-price proposal covering design, approval and the build before anything starts, so the figure you plan around does not drift once the slab is poured.
Our backyard slopes toward the escarpment. Can a flat still go there?
Usually, yes. On a fall the flat sits on a stepped slab or a raised bearer-and-joist floor instead of a flat slab, and the engineer designs the footings and the stormwater around the slope. The substructure costs more than on a level lot, and the fixed price shows that line by itself.
Can a granny flat be rented out or sold separately?
It can be rented to a tenant once it is approved and finished. Under the NSW rules a secondary dwelling stays on the same title as the main house, so the two are sold together if you ever sell.