How much does a granny flat cost in Adelaide?
Granny flat prices in Adelaide run $97,000–$141,000 for a turnkey 1-bedroom build (35–45m²) and $123,000–$185,000 for a 2-bedroom (~60m²), with prefab/kit units from about $70,000 supplied. That’s roughly $2,000–$3,100/sqm for a turnkey build, depending on design, site and finishes.
Detailed Pricing — Adelaide 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Prefab / kit granny flat — 1-bed (supplied) | $70,000total | $84,000 | $106,000 |
| Studio / 1-bed granny flat (35-45m², turnkey) | $97,000total | $114,000 | $141,000 |
| 2-bed granny flat (~60m², turnkey) | $123,000total | $154,000 | $185,000 |
| Custom / premium 2-bed (high-end finishes) | $185,000total | $229,000 | $282,000 |
| Two-storey or with attached garage | $246,000total | $304,000 | $374,000 |
| Garage / outbuilding conversion | $35,000total | $66,000 | $106,000 |
| Turnkey build (per m² built) | $2,000/sqm | $2,450 | $3,100 |
| Site works + service connections | $13,000total | $22,000 | $35,000 |
| Development approval + building consent | $3,000total | $5,000 | $11,000 |
| Demolition / site clearing (if needed) | $3,000total | $5,000 | $13,000 |
| Driveway, path & basic landscaping | $4,000total | $9,000 | $18,000 |
| Privacy fencing (per m) | $130/m | $190 | $260 |
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Get Adelaide quotes →Prices include GST. Based on Adelaide metro area, Mar 2026. Outer suburbs may vary.
Adelaide’s Granny Flat Market in 2026
In Adelaide, 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 Adelaide homeowner can make — a 2-bedroom granny flat rents well and can lift property value by 10–30%. Adelaide’s lower land and build costs make a backyard ancillary dwelling one of the most affordable ways to add a rentable home in any capital city.
The biggest swing in price is build method. Prefab and modular units (from about $70,000 supplied) are the budget end; standard site-built 1- and 2-bedroom homes ($97,000–$185,000 turnkey) are the mainstream; and custom or two-storey builds run $185,000–$374,000+. Site works and service connections ($13,000–$35,000) and approvals are the costs homeowners most often underestimate.
On the rules: In SA an ancillary or secondary dwelling is typically capped around 60–70m² and needs development approval and building consent through your council. Build method and finishes lead the price, with development approval and site works on top.
We’ve compiled pricing from Adelaide granny flat builders, prefab suppliers, and trade databases to give the most accurate picture of granny flat costs in Adelaide for 2026.
How Granny Flat Costs Vary Across Adelaide
Eastern Suburbs
Typical cost: $158k–$290k turnkey
Norwood, Burnside, Unley, Kensington. Heritage villas and premium finishes. Rear blocks can be tight; budgets often match the quality of the main home.
Coastal
Typical cost: $141k–$264k turnkey
Glenelg, Henley Beach, Brighton, Semaphore. Beachside blocks with strong rental demand. Detached 2-bed builds are popular; coastal detailing adds a little cost.
Adelaide Hills
Typical cost: $132k–$246k turnkey
Stirling, Aldgate, Mount Barker, Crafers. Large blocks suit bigger builds; bushfire-prone areas need BAL-rated construction.
Northern Suburbs
Typical cost: $106k–$202k turnkey
Salisbury, Elizabeth, Mawson Lakes, Gawler. The most affordable area — flat blocks and easy access keep turnkey prices low. Among the best yields in Adelaide.
Southern Suburbs
Typical cost: $106k–$202k turnkey
Marion, Morphett Vale, Aberfoyle Park, Noarlunga. Established and growth suburbs on generally flat land. Standard single-storey and prefab builds dominate.
What You’ll Actually Pay — Common Adelaide Granny Flat Builds
These are real-world all-in prices for common Adelaide granny flat builds in 2026 — covering build, standard site works, services and approvals where they apply.
1-bedroom granny flat — 40m², turnkey
$97,000–$132,000 total
The most popular build for independent living or a single tenant on a standard Adelaide 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
$132,000–$185,000 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 Adelaide investment build.
Prefab / modular 2-bed — installed
$84,000–$141,000 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
$40,000–$84,000 total
Converting an existing garage or outbuilding 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
$229,000–$374,000 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 eastern and coastal suburbs where land value justifies the spend.
What Affects Granny Flat Costs in Adelaide
Build method
Prefab/kit units (from ~$70,000 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 $97,000–$141,000 turnkey; a 2-bed (~60m²) $123,000–$185,000. 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 $13,000–$35,000 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 SA an ancillary or secondary dwelling is typically capped around 60–70m² and needs development approval and building consent through your council.
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 Adelaide
Frequently Asked Questions
Our Methodology
The prices on this page are compiled from publicly available cost guides, leading tradie marketplaces, peak industry body data, and individual builder websites across Australia. We cross-reference ranges from several sources and adjust for city-specific cost differences using advertised rates, wage data, and cost-of-living indicators. Our guides are produced independently — no tradesperson can influence a published figure. All prices are estimates and vary with your specific job, so always get multiple quotes. Last reviewed June 2026. Read our full methodology →