Last reviewed: August 2026
A granny flat in Sydney costs between $130,000 and $250,000 in 2026. Most standard two bedroom builds on a flat, easy block land between $145,000 and $200,000 turnkey. Where a project ends up inside that range comes down to three things: the size, the finish level, and what your particular block does to the cost before a single wall goes up.
That last one is where most people get caught out, so this guide covers it properly.
What the 2026 market rates actually look like
Published 2026 Sydney cost guides put the all-in range at roughly $130,000 to $250,000, with per-square-metre rates between $2,200 and $3,300 for a medium to high specification brick veneer build.
Here is how that breaks down by size.
| Size | Typical floor area | Published 2026 Sydney range |
| Studio or 1 bedroom | 35m² to 45m² | $120,000 to $145,000 |
| 2 bedroom | 50m² to 60m² | $145,000 to $200,000 |
| 3 bedroom | 60m² (at the legal cap) | $175,000 to $220,000+ |
For reference, BlueGum’s published starting price is from $134,990 turnkey.
Two things worth understanding about these numbers before you go any further.
Smaller does not mean proportionally cheaper. A granny flat has one kitchen, one bathroom, and one set of service connections whether it is 40m² or 60m². Those fixed costs get spread across fewer square metres on a small build, which is why the per-square-metre rate on a studio is usually higher than on a two bedroom. Going from 45m² to 60m² often adds far less than you would expect, because you are only adding floor, walls and roof, not another bathroom.
60m² is a legal ceiling, not a design choice. Under the NSW Housing SEPP 2021, a secondary dwelling is capped at 60m² of floor area unless another planning instrument covering your land allows more. So a “3 bedroom granny flat” in Sydney means three bedrooms squeezed inside the same 60m² as a two bedroom, not a bigger building.
The three things that move the price most
1. Your block, before anything is built
This is the single biggest source of quote-to-quote variation, and it is the part that has nothing to do with the building itself.
| Site factor | What it does to cost |
| Flat, clear, good access | No impact. This is the baseline every advertised price assumes. |
| Slope | Cut and fill, retaining walls, stepped footings. Can add tens of thousands. |
| Rock | Rock excavation is charged by volume and is the most common budget blowout. |
| Poor soil classification | Reactive clay means a heavier engineered slab. |
| Narrow or blocked access | If a truck and excavator cannot get in, work goes to smaller machines or by hand. |
| Distance to sewer and stormwater | Long runs, or a sewer main under the build area needing diversion. |
| Trees | Removal, arborist reports, and root protection zones that force the building to move. |
| Bush fire or flood affected | Triggers extra construction standards and usually rules out the fast approval path. |
None of these are unusual. Most Sydney blocks have at least one. A quote given before anyone has looked at your specific site is an estimate dressed up as a price.
2. Approvals
Two approval pathways exist in NSW and they cost differently.
| CDC (Complying Development) | DA (Development Application) | |
| Assessed by | A private certifier | Your local council |
| Typical cost | Lower | Higher, plus council fees and often extra consultant reports |
| Timeframe | Weeks | Months |
| Available when | Your block meets every standard in the SEPP | Your block does not, or is flood, heritage or bush fire affected |
We cover the difference in detail in our guide to CDC and DA approval. The short version for budgeting: assume CDC if your block is straightforward, and build in a contingency for DA if there is anything unusual about your site.
3. What is inside the word “turnkey”
Turnkey should mean you can unlock the door and move in. In practice it is used loosely. Two quotes with the same headline number can differ by $30,000 once you read what each one covers.
Ask specifically about: driveway and paths, fencing, letterbox and clothesline, floor coverings throughout, window furnishings, air conditioning, landscaping and turf, and the connection of water, sewer, power and NBN. If the quote does not name them, assume they are not in it.
The costs that sit outside the build price
Published guides put these additional items at roughly $14,000 to $41,000 on top of the build, depending on the site.
- Council or certifier approval fees
- Long service levy, payable on work over the statutory threshold
- Section 7.11 or 7.12 contributions, which vary a lot between councils
- Survey, soil test and engineering
- BASIX and energy assessment
- Utility connection fees and any required main upgrade
- Excavation, rock removal, retaining
- Driveway crossing, if the council requires a new one
A quote that shows a single number with none of this named is not a complete picture of what you will spend.
What you should ask for instead of a ballpark
A ballpark price over the phone is worth very little, because the person giving it has not seen the thing that determines the price. What is worth asking for is a fixed price quote that follows a site inspection, with the inclusions listed line by line and the exclusions stated plainly.
If a builder will not put exclusions in writing, that is the answer to your question.
Frequently asked questions
What is the cheapest a granny flat can realistically cost in Sydney?
Published 2026 guides start around $120,000 for a studio or one bedroom on a flat, straightforward block with easy access. Anything materially below that usually signals either a small footprint, a lower specification, or a quote with significant exclusions that will surface later as variations.
Why do two builders quote such different prices for the same size?
Almost always because they are pricing different scopes, not different buildings. One includes floor coverings, driveway, fencing and connections, the other lists them as exclusions. Put both quotes side by side and compare the inclusion lists before you compare the totals.
Does a bigger granny flat cost proportionally more?
No. The kitchen, bathroom and service connections cost the same at 40m² as at 60m², so those fixed costs are spread thinner as the building grows. Going from 45m² to the 60m² cap often costs less per additional square metre than the rest of the build.
Do I pay for the approval separately?
It depends on the builder. Some quote the build only and leave you to arrange approval, others manage the approval and include it. BlueGum manages both CDC and DA approvals in-house. Ask any builder to state clearly which model they are quoting, because it changes the comparison.
How much should I keep aside as contingency?
For a site that has been properly inspected and quoted at a fixed price, a smaller contingency is reasonable. For a quote given without a site inspection, treat the number as provisional and expect movement once someone actually looks at the block.
Get a real number for your block
Every figure on this page is a market range. The only number that matters is the one for your address, and that requires someone to look at your slope, soil, access and services.
Check whether your block qualifies, or call BlueGum on 1300 060 651 to arrange a site assessment.
BlueGum Granny Flats is a licensed NSW builder, licence number 247388C, and a member of the Housing Industry Association. Cost ranges in this article are drawn from published 2026 Sydney market guides and are indicative only. They are not a quote.
