How much does a granny flat cost in Brisbane?
The two-bedroom granny flat is the size Brisbane searchers price most often, and built turnkey it costs $140,000–$210,000, typically $175,000. A studio or one-bedroom flat runs $110,000–$160,000, while a prefab one-bed delivered to site starts lower, at $80,000–$120,000. By floor area, turnkey building costs $2,300–$3,500 a square metre. Brisbane homes are large by national standards, with 41.1% having four or more bedrooms against 34.8% across Australia (ABS 2021 Census), and a backyard flat has to fit around that main house, its drainage and its driveway, which is where site costs come from.
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 Brisbane 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 |
| Council approval / building application | $3,000total | $6,000 | $11,000 |
| 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 |
You're in.
A local installer will be in touch about your job. No spam, no middleman.
Getting quotes for a granny flat in Brisbane? Get a quote from a verified local builder — free, no obligation.
Get Brisbane quotes →Prices include GST. Based on Brisbane metro area, October 2026. Outer suburbs may vary.
Brisbane’s Granny Flat Market in 2026
Under Brisbane City Plan 2014 a dwelling house can be two dwellings where one is a secondary dwelling, and it is accepted development, needing no planning approval, when it meets the code criteria — unless a code-assessable overlay applies.
Who can live in it changed in 2022: new secondary dwellings in Queensland may be rented to anyone for long-term living, related to the main household or not. The table’s council approval and building application row is $3,000–$11,000.
Two-bedroom prices in the Brisbane table: $140,000–$210,000 for a turnkey flat of about 60 m², or $210,000–$320,000 with high-end finishes.
How Granny Flat Costs Vary Across Brisbane
Inner Suburbs
Typical cost: $180k–$330k turnkey
New Farm, Paddington, West End, Bulimba, Hawthorne. Character blocks are often steep or tight, adding site-works and access cost. High land values make a quality detached 2-bed a strong rental and resale play.
Bayside
Typical cost: $160k–$300k turnkey
Wynnum, Manly, Wakerley, Wellington Point. Larger flat blocks suit detached builds; coastal sites can need corrosion-resistant detailing. Strong rental demand near the water.
Southside
Typical cost: $150k–$280k turnkey
Sunnybank, Mount Gravatt, Carindale, Holland Park. Big family blocks with good access make for easy detached builds. Popular in high-demand school catchments.
Northside
Typical cost: $150k–$280k turnkey
Chermside, Aspley, Albany Creek, North Lakes. A mix of established and newer estates. Standard single-storey builds and prefab units are common.
Western Suburbs & Ipswich
Typical cost: $120k–$230k turnkey
Indooroopilly, Kenmore, Springfield, Ipswich. The most affordable area — flat newer blocks and easy access keep turnkey prices low. Strong rental yields in growth estates.
What You’ll Actually Pay — Common Brisbane Granny Flat Builds
Brisbane granny flats, each from a row in the table.
1-bedroom granny flat — 40m², turnkey
$110,000–$160,000 total
The typical one-bedroom or studio is $130,000 turnkey; $45,000 less than the typical two-bedroom.
2-bedroom granny flat — 60m², turnkey
$140,000–$210,000 total
Two bedrooms, about 60 m², $175,000 typical; add the typical approval and building application ($6,000) for $181,000.
Prefab / modular 2-bed — installed
$80,000–$120,000 delivered (1-bed row)
The table’s only prefab row is a one-bedroom delivered at $80,000–$120,000; a two-bedroom modular installed has no row here.
Garage / outbuilding conversion to studio
$40,000–$120,000 total
A garage conversion at $40,000–$120,000 — under the 2022 rules it can be let to anyone.
Custom architect 2-bed / two-storey
$210,000–$425,000 total
From $210,000 for a custom two-bedroom to $425,000 for two storeys or one over a garage.
Granny flat prices in Brisbane (2026): 1 bedroom, 2 bedroom, prefab and turnkey
A granny flat in Brisbane costs $110,000–$160,000 for a 1-bedroom or studio of 35–45 m² built turnkey, with $130,000 typical, and $140,000–$210,000 for a 2-bedroom flat of around 60 m². Turnkey means designed, approved, built, connected and finished to move into. Per square metre built, that is $2,300–$3,500. A 1-bedroom prefab or modular flat is $80,000–$120,000 delivered, before the slab, services and finishing on site.
| Job | Low | Typical | High |
|---|---|---|---|
| Studio / 1-bed granny flat (35–45 m², turnkey) | $110,000 | $130,000 | $160,000 |
| 2-bed granny flat (~60 m², turnkey) | $140,000 | $175,000 | $210,000 |
| Prefab / modular granny flat, 1-bed (delivered) | $80,000 | $95,000 | $120,000 |
| Turnkey build (per m² built) | $2,300/m² | $2,800 | $3,500 |
| Site works + service connections | $15,000 | $25,000 | $40,000 |
| Garage / outbuilding conversion | $40,000 | $75,000 | $120,000 |
1 bedroom vs 2 bedroom granny flat prices in Brisbane: the second bedroom adds floor area, a longer roof and more wall, so the price moves with the square metres rather than the room count; the per-m² figure above is the way to compare two quotes of different sizes. What does not scale is the fixed cost: site works and service connections ($15,000–$40,000) are much the same for a 1-bed and a 2-bed, which is why the smaller flat is dearer per square metre.
Kit vs turnkey: a kit price is the building supplied, not built. Add the slab, the trades to erect and fit it out, the service connections and the approval before comparing it with a turnkey price. Converting an existing garage ($40,000–$120,000) is the cheapest route to a self-contained flat where the structure is sound.
What moves a granny flat quote in Brisbane:
- Size and layout: square metres set the build price; a bathroom and kitchen are the dearest rooms per metre.
- Site: sloping blocks, poor soil, tree removal and long runs to the sewer, water and power all sit in site works.
- Approval: Queensland rules on size, setbacks and who can live in the flat decide whether it is a simple approval or a full application.
- Finish: standard fittings and finishes are the base; stone benchtops, premium tapware and timber floors move a build toward the custom band.
- Access: a tight side access limits machinery and prefab delivery, adding labour.
Ask every Brisbane builder for the same thing: a turnkey price, the square metres, and site works and approvals as separate lines, so the price list from each compares.
What Affects Granny Flat Costs in Brisbane
Who can live in it
Queensland planning law defines a secondary dwelling as one used with, but subordinate to, the main house on the lot, attached or detached, whether or not the people in it are related to your household. New secondary dwellings may be rented privately to anyone for long-term living. With the median Greater Brisbane rent at $380 a week (ABS 2021 Census), many owners weigh the build against a rental return as well as family use.
City Plan and approvals
Under Brisbane City Plan, a dwelling house can be two dwellings, one of them secondary, so a granny flat sits within the house use rather than counting as a dual occupancy. It is accepted development, with no planning approval, when your lot is in an accepted development zone and meets the code criteria; a code assessable overlay brings an application. Building approval comes from council or a private certifier, and approval costs run $3,000–$11,000.
Prefab, site-built or two storeys
A modular one-bed delivered to site is $80,000–$120,000, against $110,000–$160,000 for a turnkey site-built one. Delivered is not finished: ask whether footings, crane hire and connections are in that price. Custom designs with high-end finishes reach $210,000–$320,000, and a two-storey flat, site costs and approvals included, $280,000–$425,000.
Deposits, licences and warranty
In Queensland, residential building work over $3,300 needs a QBCC-licensed builder, and home warranty insurance is compulsory; it pays up to $200,000 on claims and stays with the property for six and a half years. On a contract over $20,000 the most a builder can take as a deposit is 5%, unless off-site prefabrication is more than half the price, when up to 20% is allowed. Ask a modular supplier which of those applies to its contract.
A summer-wet city
February is Brisbane's wettest month at 176.1 mm, and December, January and March each average close to 140 mm or more, while September is the driest at 28.6 mm (BOM averages). Trenches for sewer and stormwater fill up and slab pours get pushed back in the wet, so a build that starts in winter usually gets out of the ground sooner. Site works and service connections run $15,000–$40,000.
Wind, storms and climate zone 2
Brisbane is in Wind Region B, the intermediate region bordering the cyclone zone, so buildings are designed to resist weakened tropical cyclones. Brisbane City Council also lists severe storms, with large hail, damaging winds and heavy rain, among the city's common natural disasters. The city falls in NCC climate zone 2, warm and humid, so wide eaves, ceiling fans and roof insulation earn their place even in a small flat.
Clearing and fencing the site
If an old shed or carport stands where the flat will go, clearing it costs $3,000–$15,000. In Brisbane you may need building approval from a licensed certifier before demolishing, and a heritage listing or the traditional building character overlay can add planning approval. A driveway and path cost $5,000–$20,000, and a privacy fence between the two homes is $80–$190 a metre.
How to Save Money on Granny Flat Cost in Brisbane
Frequently Asked Questions — Granny Flat Cost in Brisbane
Our Methodology
We build these estimates by pulling pricing from public cost guides, major trade marketplaces, industry body rate data, and builders’ own websites, then cross-checking the ranges and adjusting for local cost-of-living and advertised labour rates. The figures are editorially independent and no business pays to change them. Treat every number as a guide rather than a quote — the only way to know your real price is to get a few written quotes. Last reviewed October 2026. Read our full methodology →