How much does a granny flat cost in Australia?
A granny flat in Australia costs $110,000–$160,000 for a turnkey 1-bedroom build (35–45m²), $140,000–$210,000 for a 2-bedroom (around 60m²), and from about $80,000 supplied for a prefab or kit unit. Per square metre, turnkey builds run $2,300–$3,500/sqm depending on design, site, and finishes.
Detailed Pricing — Granny Flat Cost in Australia 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 |
How granny flat prices compare across 17 cities and how they move month to month: Tradie Price Index, October 2026 →
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Get quotes →Prices include GST. National averages across Australia, October 2026. Prices vary by city and site.
Australia’s Granny Flat Market in 2026
Australia has become Australia’s busiest granny flat market. Sky-high property prices, multi-generational living, and strong rental demand have made the secondary dwelling one of the highest-return additions an Australian homeowner can make — a 2-bedroom granny flat rents for roughly $400–$600 a week.
NSW planning rules are a big reason. Under NSW's State Environmental Planning Policy (Housing) 2021, a granny flat up to 60m² on a block of at least 450m² can usually be approved as a Complying Development Certificate (CDC) through a private certifier in as little as 20 days — far faster than a full Development Application. That fast, predictable pathway is why Australian builders can quote turnkey packages with confidence.
The biggest swing in price is build method. Prefab and modular units (from about $80,000 supplied) are the budget end; standard site-built 1- and 2-bedroom homes ($110,000–$210,000 turnkey) are the mainstream; and custom architect-designed or two-storey builds run $260,000–$425,000+. On top of the build, site works and service connections ($15,000–$40,000) and approvals ($3,000–$12,000) are the costs homeowners most often underestimate.
Australian labour and site costs typically run 10–15% above the national average, and tight or sloping blocks across the inner suburbs add craneage and access costs. We’ve compiled pricing from Australian granny flat builders, prefab suppliers, and trade databases to give the most accurate picture of granny flat costs in Australia for 2026.
Granny Flats Cost by City
Granny flat prices vary across Australia with labour rates, site works and the planning pathway. Pick your city for a detailed local cost guide:
What You’ll Actually Pay — Common Granny Flat Builds
Here’s what typical granny flat projects cost all-in across Australia in 2026, including build, standard site works, services, and approvals where noted.
1-bedroom granny flat — 40m², turnkey
$110,000–$150,000 total
A common build for independent living or a single tenant on a standard block. A detached single-storey home with bedroom, bathroom, kitchenette and open living, standard finishes, slab and service connections. CDC approval where the block qualifies. Around 12–14 weeks once approved.
2-bedroom granny flat — 60m², turnkey
$150,000–$210,000 total
The maximum size allowed under CDC and the best rental return. Two bedrooms, full bathroom and proper kitchen with room for real furniture. Standard-to-mid finishes, slab, services and approval included. The workhorse Australian investment build — allow 14–16 weeks once approved.
Prefab / modular 2-bed — installed
$95,000–$160,000 total
Factory-built and craned in, then connected to services on a prepared slab. Faster than site-built and priced lower, with less on-site disruption. Site works, slab and connections are usually quoted on top of the supplied unit price.
Garage / outbuilding conversion to studio
$45,000–$95,000 total
Converting an existing structure is the cheapest route to a secondary dwelling — but plumbing, a bathroom and kitchenette, insulation, glazing and compliance upgrades drive the price. Best value where the existing slab and walls are sound.
Custom architect 2-bed / two-storey
$260,000–$425,000 total
A premium, fully designed secondary dwelling — high-end finishes, larger footprint, or a two-storey design on a tight block. Needs design, engineering and often a DA. Common where land value justifies the spend and the granny flat doubles as long-term family accommodation.
What Affects Granny Flat Costs in Australia
Build method
Prefab or modular units (from ~$80,000 delivered) are cheapest; standard site-built homes are mainstream; custom and two-storey designs cost the most.
Size & bedrooms
A 1-bed (35–45m²) runs $110,000–$160,000 turnkey; a 2-bed (~60m²) $140,000–$210,000. 60m² is the CDC maximum in NSW.
Site works & access
Slope, rock, poor access and craneage add $15,000–$40,000. Flat, clear, easy-access blocks are far cheaper to build on.
Service connections
Water, sewer, power and stormwater connections add cost — keeping wet areas near the main house’s services keeps plumbing runs short.
Approvals (CDC vs DA)
A CDC (up to 60m², 450m²+ block) is faster and cheaper; a full DA costs more and takes longer. Approvals run $3,000–$12,000.
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 Granny Flat Cost in Australia
Frequently Asked Questions — Granny Flat Cost in Australia
Our Methodology
These are independent estimates from public cost guides, marketplaces and industry rate data, and no tradesperson can influence them, so always get a few quotes. Last reviewed October 2026. Read our full methodology →