How much does a granny flat cost in Sydney?
In Sydney, a granny flat costs $110,000–$160,000 for a studio or one-bedroom flat built turnkey, and a two-bedroom flat of about 60 square metres $140,000–$210,000, typically $175,000. A delivered prefab one-bedroom unit starts lower at $80,000–$120,000, and converting a garage or outbuilding runs $40,000–$120,000. Only 55.8% of Sydney dwellings are separate houses, well under the 72.3% national figure (ABS 2021 Census), so for many owners the first question is not the floor plan but whether the block qualifies at all.
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 Sydney 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 Sydney quotes →Prices include GST. Based on Sydney metro area, October 2026. Outer suburbs may vary.
Sydney’s Granny Flat Market in 2026
In NSW a granny flat is a secondary dwelling under the State Environmental Planning Policy (Housing) 2021. Where it meets that policy’s standards it is complying development: the City of Sydney or a private certifier can approve it without a development application, and a complying development approval can be issued in as little as 20 days.
The table’s approvals package for that route (a complying development certificate plus a private certifier) is $3,000–$12,000. The Housing SEPP asks for no extra parking for a granny flat — useful in a city where 30.7% of dwellings were flats or apartments at the 2021 Census.
Build prices in the Sydney table: a studio or one-bedroom flat $110,000–$160,000, a two-bedroom flat of about 60 m² $140,000–$210,000, both turnkey, with site works and service connections a separate $15,000–$40,000.
How Granny Flat Costs Vary Across Sydney
Eastern Suburbs & Inner City
Typical cost: $180,000–$320,000+ turnkey
Bondi, Randwick, Paddington, Surry Hills. Small lots and tight access push costs well above the Sydney average — craneage and hand-loading add up, and many blocks fall under the 450m² CDC threshold, forcing a slower DA. Where they do fit, high land values make the rental and resale return strong, so premium finishes are common.
Inner West
Typical cost: $160,000–$300,000
Marrickville, Newtown, Leichhardt, Dulwich Hill. Federation and Victorian blocks are often narrow with no rear lane, so access is the main cost driver. Heritage Conservation Areas can restrict a second dwelling’s height and street visibility — check feasibility before committing.
Northern Beaches & North Shore
Typical cost: $170,000–$340,000
Manly, Dee Why, Mosman, Pymble. Larger blocks suit detached 2-bed builds, but sloping bush sites need engineered slabs, retaining and craneage. Bushfire-prone areas around Ku-ring-gai and Pittwater require BAL-rated construction, which adds cost.
Sutherland Shire & South Sydney
Typical cost: $150,000–$280,000
Cronulla, Miranda, Caringbah, Hurstville. Flatter, larger blocks and good access make this one of the easier areas to build in Greater Sydney. Strong rental demand near the line and the beaches makes a 2-bed granny flat a popular investment.
Western & South-Western Sydney
Typical cost: $120,000–$230,000
Penrith, Blacktown, Liverpool, Campbelltown. The most affordable and active area for granny flats in Sydney — big, flat blocks over 450m², easy access, and strong builder competition keep turnkey prices below the metro average. Rental yields here are among the best in the city.
What You’ll Actually Pay — Common Sydney Granny Flat Builds
Five Sydney granny flats, priced from the table above.
1-bedroom granny flat — 40m², turnkey
$110,000–$160,000 total
The smallest turnkey build: at the typical $130,000, plus the typical approvals package ($6,000), the flat is $136,000 before site works.
2-bedroom granny flat — 60m², turnkey
$140,000–$210,000 total
Two bedrooms in about 60 m²: $175,000 typical. Add site works and connections at the typical $25,000 and it comes to $200,000.
Prefab / modular 2-bed — installed
$80,000–$120,000 delivered (1-bed row)
The table has no installed two-bedroom modular row. Its nearest, a one-bedroom prefab delivered, is $80,000–$120,000; slab, connections and approval are on top.
Garage / outbuilding conversion to studio
$40,000–$120,000 total
Turning a garage or outbuilding into a studio: $75,000 typical, $55,000 less than a new turnkey studio.
Custom architect 2-bed / two-storey
$210,000–$425,000 total
The top of the table spans two rows: a custom two-bedroom with high-end finishes at $210,000–$320,000, and a two-storey flat or one over a garage at $280,000–$425,000.
What Affects Granny Flat Costs in Sydney
Fast-track approval or a DA
Meet the Housing SEPP standards and a granny flat can skip the development application altogether, certified as complying development by council or an accredited certifier; the state puts the fastest of those approvals at 20 days. In the City of Sydney area, the City or a private certifier can determine it. Outside the standards, a DA to council is slower. The approvals package here is $3,000–$12,000.
The 450 square metre lot
The fast-track route only opens on lots of 450 square metres or more, and Sydney is a city of smaller holdings: 30.7% of dwellings are flats and apartments, against 14.2% nationally (ABS 2021 Census). On a house lot under that size, a development application to council is the remaining route, which adds time and fees before any building starts.
How big it can be
Local plans limit the flat to 60 square metres, unless a set share of the main house works out larger. Under the fast-track rules, the total floor area adds the house, the flat and attached structures such as a carport, garage, deck or verandah, so a flat with its own garage ($170,000–$260,000) uses more of the allowance.
Licensed builders and HBC cover
NSW requires a contractor licence for residential building work worth more than $5,000, and every flat in the table sits far above that. Over $20,000 the builder needs Home Building Compensation cover, and it is illegal to ask for a deposit or any payment until the cover is in place and you hold its certificate. The legal ceiling on a deposit is 10 percent, about $17,500 on a typical two-bedroom flat.
Site works on a tight block
Digging, stormwater and the water, sewer and electricity connections come to $15,000–$40,000, with $3,000–$15,000 more if an old shed or slab must go first. If anything being cleared contains asbestos, the City of Sydney requires neighbours on adjoining and opposite premises to be told in writing before removal starts. A floor plan with its wet rooms on the side facing the existing sewer keeps that connection short.
Renting it out
Renting is common in Sydney, where 35.9% of households rent (ABS 2021 Census). Revenue NSW lets an owner keep the land tax principal place of residence exemption when the leased part of the home is one flat. Titles stay joined, as the flat cannot be split onto its own lot, and the Housing SEPP sets no extra car space for it.
Wet autumn, drier spring
Observatory Hill averages 133.1 mm of rain in June and 131.6 mm in March, against 68.1 mm in September (BOM averages). Digging and pouring are the stages rain holds up most, so a build that starts digging in late winter can have its slab down during the drier run from August to December.
How to Save Money on Granny Flat Cost in Sydney
Frequently Asked Questions — Granny Flat Cost in Sydney
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 →