How much does a granny flat cost in Wollongong?
In Wollongong, a granny flat with a studio or single bedroom, handed over ready to live in, costs $110,000–$160,000, while a two-bedroom flat runs $140,000–$210,000, typically $175,000. Local searches lean toward kits: a prefab one-bedroom delivered to the block costs $80,000–$120,000, before it is set on a base and connected. Measured by floor area, a finished build works out at $2,300–$3,500 a square metre. The housing suits it: 71.3% of Wollongong dwellings are separate houses, 41.6% have three bedrooms, and 34.8% are owned outright, above the NSW figure of 31.5% (ABS 2021 Census). All prices include GST.
Comparing cities, or after the Australia-wide picture? See the national guide: How much does a granny flat cost in Australia?
Detailed Pricing — Granny Flat Cost in Wollongong 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Prefab / modular granny flat — 1-bed (delivered) | $80,000total | $95,000 | $120,000 |
| Studio / 1-bed granny flat (35-45m², turnkey) | $110,000total | $130,000 | $160,000 |
| 2-bed granny flat (~60m², turnkey) | $140,000total | $175,000 | $210,000 |
| Custom / premium 2-bed (high-end finishes) | $210,000total | $260,000 | $320,000 |
| Two-storey granny flat (complete, incl. site costs + approvals) | $280,000total | $345,000 | $425,000 |
| Granny flat with attached single garage (complete, incl. site costs + approvals) | $170,000total | $210,000 | $260,000 |
| Garage / outbuilding conversion | $40,000total | $75,000 | $120,000 |
| Turnkey build (per m² built) | $2,300/sqm | $2,800 | $3,500 |
| Site works + service connections | $15,000total | $25,000 | $40,000 |
| Approvals, full package (CDC + private certifier) | $3,000total | $6,000 | $12,000 |
| Demolition / site clearing (if needed) | $3,000total | $6,000 | $15,000 |
| Driveway, path & basic landscaping | $5,000total | $10,000 | $20,000 |
| Privacy fencing (per m) | $80/m | $130 | $190 |
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Get Wollongong quotes →Prices include GST. Based on Wollongong metro area, October 2026. Outer suburbs may vary.
Wollongong’s Granny Flat Market in 2026
Granny flats in NSW are allowed in residential zones R1 to R5, and to go through as complying development the lot must be at least 450 m²; on a smaller lot, or where the flat fails the standards, a development application can still go to council.
The floor-area test is wider than the flat itself: it counts the main house, the granny flat and any attached carport, garage, deck, patio, pergola or verandah. 71.3% of Wollongong dwellings were separate houses at the 2021 Census.
For anyone pricing a kit: the table’s nearest row is a delivered one-bedroom prefab at $80,000–$120,000; a turnkey studio or one-bedroom is $110,000–$160,000 and a turnkey two-bedroom $140,000–$210,000.
How Granny Flat Costs Vary Across Wollongong
Northern Suburbs
Typical cost: $180k–$330k turnkey
Thirroul, Austinmer, Bulli, Woonona. Beachside blocks between escarpment and sea; slope and access add site-works cost. High land values and strong rental demand.
Central Wollongong
Typical cost: $150k–$280k turnkey
Wollongong, North Wollongong, Fairy Meadow, Gwynneville. Established suburbs near the city and beaches with workable blocks. Detached 2-bed builds are popular.
Western Suburbs
Typical cost: $150k–$280k turnkey
Figtree, Mount Keira, Mount Ousley, Kembla Grange. Escarpment-side blocks often slope, needing engineered slabs and retaining — a key cost factor.
Southern Suburbs
Typical cost: $120k–$230k turnkey
Dapto, Horsley, Albion Park, Oak Flats. Growth suburbs on flatter blocks with easier access. Best value and strong yields.
Shellharbour & Kiama
Typical cost: $160k–$300k turnkey
Shellharbour, Shell Cove, Kiama, Gerringong. Coastal family and holiday suburbs with strong rental demand. Detached builds with coastal detailing.
What You’ll Actually Pay — Common Wollongong Granny Flat Builds
Wollongong granny flats, each priced from this page’s rows.
1-bedroom granny flat — 40m², turnkey
$110,000–$160,000 total
Typical turnkey studio or one-bedroom: $130,000. The approvals row ($3,000–$12,000) covers a complying development certificate and certifier.
2-bedroom granny flat — 60m², turnkey
$140,000–$210,000 total
A 60 m² two-bedroom flat at the typical $175,000; on a lot under 450 m² expect a development application instead of the fast route.
Prefab / modular 2-bed — installed
$80,000–$120,000 delivered (1-bed row)
A delivered prefab or kit flat is $80,000–$120,000 for one bedroom — the only prefab row — before slab, site works ($15,000–$40,000) and approval.
Garage / outbuilding conversion to studio
$40,000–$120,000 total
Converting a garage: $40,000–$120,000, or about $100,000 under a new two-bedroom at the typical prices.
Custom architect 2-bed / two-storey
$210,000–$425,000 total
Custom two-bedroom with high-end finishes $210,000–$320,000; two-storey or with a garage $280,000–$425,000. Both sit under the same floor-area test as any other granny flat.
What Affects Granny Flat Costs in Wollongong
Kit, prefab or built on site
A delivered prefab one-bedroom starts lower than a turnkey studio, at $80,000–$120,000 against $110,000–$160,000. The kit price covers only the building. Add $15,000–$40,000 for site works and service connections, and the approval package at $3,000–$12,000 before comparing it with turnkey quotes. Fitting out a garage or backyard outbuilding as a self-contained flat is $40,000–$120,000.
Fast-track approval or a DA
A council or accredited certifier can approve a granny flat as complying development, skipping the development application, as long as the design meets the Housing SEPP standards. The lot must be at least 450 m² for that route. NSW says complying development approvals can be issued in as little as 20 days, against an average of 70 days to determine a DA. On a smaller block, the application goes to Wollongong City Council.
How large it can be
NSW planning controls generally cap a granny flat at 60 square metres, or a percentage of the main house where the local plan allows more. For complying development the floor-area sum takes in both dwellings plus any attached carport, garage, deck, patio, pergola or verandah. The site keeps one main house and one granny flat, cannot be subdivided, and needs no extra parking. A two-storey flat is $280,000–$425,000.
Sloping blocks and a wet late summer
On a block that climbs toward the escarpment, cutting a pad, retaining and craneage push site works toward the top of $15,000–$40,000. Knocking down an old shed or breaking out a slab first adds $3,000–$15,000. February (156.4 mm) and March (160.4 mm) are Wollongong's wettest months, while July (63.4 mm) is the driest (BOM averages), so earthworks and the slab pour are easier to keep on schedule in July and August.
Licence, insurance and the deposit
Every build in this table is well over the NSW lines. A contractor licence is needed for work over $5,000, and on home building work over $20,000 the builder must hold home building compensation (HBC) cover before taking any money, deposit included. The deposit is capped at 10 percent, and a contract over $20,000 must carry a cooling-off period of five clear business days.
Renting out the flat
Renters made up 29.3% of Wollongong households at the ABS 2021 Census, when the median rent was $400 a week, which gives a sense of the market for a self-contained flat. Revenue NSW lets an owner who leases out one flat as part of their home still claim the principal place of residence exemption from land tax. Ask your accountant how rent income is taxed before you settle on the size.
Finishes, driveway and fencing
Stone benchtops, timber floors and air-conditioning lift a two-bedroom flat into the custom range of $210,000–$320,000. Outside, budget $5,000–$20,000 for driveway, paths and simple landscaping, and privacy fencing between the two dwellings is $80–$190 a metre. Adding a single garage under the same roof brings the complete job to $170,000–$260,000.
How to Save Money on Granny Flat Cost in Wollongong
Frequently Asked Questions — Granny Flat Cost in Wollongong
Our Methodology
Our pricing comes from a mix of sources — public cost guides, tradie marketplaces, peak-body rate data, and individual builder sites — cross-referenced and then adjusted for regional cost differences. We produce these guides independently, and no tradesperson can buy their way onto the page or sway a figure. Every price is an estimate that will move with the details of your job, so we always recommend getting multiple written quotes. Last reviewed October 2026. Read our full methodology →