How much does a granny flat cost in Wollongong?
Granny flat prices in Wollongong run $107,000–$155,000 for a turnkey 1-bedroom build (35–45m²) and $136,000–$204,000 for a 2-bedroom (~60m²), with prefab/kit units from about $78,000 supplied. That’s roughly $2,250–$3,400/sqm for a turnkey build, depending on design, site and finishes.
Detailed Pricing — Wollongong 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Prefab / kit granny flat — 1-bed (supplied) | $78,000total | $92,000 | $116,000 |
| Studio / 1-bed granny flat (35-45m², turnkey) | $107,000total | $126,000 | $155,000 |
| 2-bed granny flat (~60m², turnkey) | $136,000total | $170,000 | $204,000 |
| Custom / premium 2-bed (high-end finishes) | $204,000total | $252,000 | $310,000 |
| Two-storey or with attached garage | $272,000total | $335,000 | $412,000 |
| Garage / outbuilding conversion | $39,000total | $73,000 | $116,000 |
| Turnkey build (per m² built) | $2,250/sqm | $2,700 | $3,400 |
| Site works + service connections | $15,000total | $24,000 | $39,000 |
| CDC approval + 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 | $19,000 |
| Privacy fencing (per m) | $150/m | $210 | $290 |
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Get Wollongong quotes →Prices include GST. Based on Wollongong metro area, Mar 2026. Outer suburbs may vary.
Wollongong’s Granny Flat Market in 2026
In Wollongong, the granny flat is one of the most-requested home additions going. High property prices, multi-generational living, and strong rental demand make a secondary dwelling one of the higher-return additions a Wollongong homeowner can make — a 2-bedroom granny flat rents well and can lift property value by 10–30%. Wollongong follows the NSW secondary-dwelling rules — 60m² on a 450m²+ block via the CDC pathway — and strong commuter rental demand keeps yields high.
The biggest swing in price is build method. Prefab and modular units (from about $78,000 supplied) are the budget end; standard site-built 1- and 2-bedroom homes ($107,000–$204,000 turnkey) are the mainstream; and custom or two-storey builds run $204,000–$412,000+. Site works and service connections ($15,000–$39,000) and approvals are the costs homeowners most often underestimate.
On the rules: In NSW a secondary dwelling up to 60m² on a 450m²+ block can be approved as Complying Development (CDC) through a private certifier in around 20 days, rather than a full DA. Build method, finishes and site access (escarpment slope) set the price, plus services and approval.
We’ve compiled pricing from Wollongong granny flat builders, prefab suppliers, and trade databases to give the most accurate picture of granny flat costs in Wollongong for 2026.
How Granny Flat Costs Vary Across Wollongong
Northern Suburbs
Typical cost: $175k–$320k 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: $146k–$272k 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: $146k–$272k 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: $116k–$223k turnkey
Dapto, Horsley, Albion Park, Oak Flats. Growth suburbs on flatter blocks with easier access. Best value and strong yields.
Shellharbour & Kiama
Typical cost: $155k–$291k 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
These are real-world all-in prices for common Wollongong granny flat builds in 2026 — covering build, standard site works, services and approvals where they apply.
1-bedroom granny flat — 40m², turnkey
$107,000–$146,000 total
The most popular build for independent living or a single tenant on a standard Wollongong block. A detached single-storey home with bedroom, bathroom, kitchenette and open living, standard finishes, slab and service connections. Around 12–14 weeks once approved.
2-bedroom granny flat — 60m², turnkey
$146,000–$204,000 total
The maximum size under most rules and the best rental return. Two bedrooms, full bathroom and a proper kitchen with room for real furniture. Standard-to-mid finishes, slab, services and approval included — allow 14–16 weeks once approved. The workhorse Wollongong investment build.
Prefab / modular 2-bed — installed
$92,000–$155,000 total
Built off-site and lifted in, then hooked up to services on a prepared slab. Quicker and cheaper than a site build with far less mess — just remember slab, site works and connections are usually extra on top of the unit price.
Garage / outbuilding conversion to studio
$44,000–$92,000 total
Turning a garage or outbuilding into a studio is the lowest-cost path to a secondary dwelling — though adding plumbing, a bathroom and kitchenette, insulation and compliance upgrades is where the money goes. Best value when the slab and walls are already sound.
Custom architect 2-bed / two-storey
$252,000–$412,000 total
A premium, fully designed secondary dwelling — high-end finishes, a larger footprint, or a two-storey design on a tight block. Needs design and engineering, and is common across the northern beachside suburbs where land value justifies the spend.
What Affects Granny Flat Costs in Wollongong
Build method
Prefab/kit units (from ~$78,000 supplied) are cheapest; standard site-built homes are mainstream; custom and two-storey designs cost the most.
Size & bedrooms
A 1-bed (35–45m²) runs $107,000–$155,000 turnkey; a 2-bed (~60m²) $136,000–$204,000. 60m² is the cap in most states.
Site works & access
A flat, clear, easy-access block is cheapest; slope, rock, tight access and craneage can add $15,000–$39,000 in site works.
Service connections
Water, sewer, power and stormwater connections add cost — keeping wet areas near the main house’s services keeps plumbing runs short.
Approvals
In NSW a secondary dwelling up to 60m² on a 450m²+ block can be approved as Complying Development (CDC) through a private certifier in around 20 days, rather than a full DA.
Finishes & inclusions
Standard finishes keep costs down; stone benchtops, premium flooring, decks and air-conditioning push a build toward the top of the range.
How to Save Money on a Granny Flat in Wollongong
Frequently Asked Questions
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 June 2026. Read our full methodology →