Last reviewed: August 2026
Published 2026 Sydney rates for a granny flat sit between $2,200 and $3,300 per square metre for a medium to high specification brick veneer build. That is noticeably higher than the rate for a full sized house, and the reason is simple: a granny flat has all the expensive parts of a home packed into a much smaller floor area.
The rate is useful for understanding why a price is what it is. It is a poor tool for comparing two quotes, and this article explains why.
Why the rate is higher than a house
A house and a granny flat both need a kitchen, a bathroom, a hot water system, and connections to water, sewer, power and data. Those items cost roughly the same in both.
The difference is what you divide them by.
| Granny flat | Typical house | |
| Floor area | 60m² | 200m²+ |
| Kitchens | 1 | 1 |
| Bathrooms | 1 | 2 or more |
| Service connections | 1 set | 1 set |
| Fixed costs spread across | 60m² | 200m²+ |
The kitchen, bathroom and connections are the most expensive square metres in any home. In a granny flat they make up a much larger share of the total floor area, so the average rate rises.
This is also why the rate falls as the granny flat gets bigger. A 40m² studio carries the same kitchen as a 60m² two bedroom, spread across two thirds of the space.
What the rate does and does not include
This is where per-square-metre comparisons fall apart.
| Usually inside the rate | Usually outside the rate |
| Slab, frame, roof, cladding | Site excavation and levelling |
| Windows, doors, insulation | Rock removal |
| Kitchen and bathroom fit-out | Retaining walls |
| Internal linings, painting | Service connection fees |
| Basic electrical and plumbing | Approval and certifier fees |
| Council contributions | |
| Driveway, fencing, landscaping | |
| Floor coverings and window furnishings |
Two builders can quote the same rate per square metre and produce totals thousands of dollars apart, purely because of which column each one put those items in.
Why the rate is a bad comparison tool
Three reasons.
It hides the inclusions. A $2,200/m² quote that excludes floor coverings, driveway and connections is more expensive than a $2,900/m² quote that includes them. The rate tells you nothing about scope.
It hides the specification. Rate ranges span low to high specification. The same footprint built with entry level fittings and with quality fittings will land at opposite ends of the range, and the rate alone will not tell you which you are looking at.
It ignores your block. Site costs are not a function of floor area. Rock does not care how many square metres you are building. On a difficult block, site costs can add more than the difference between the top and bottom of the rate range.
What to use instead
Compare total delivered cost for an identical scope.
- Write down every item you expect: the building, the approvals, the site works, the connections, the finishes, the external works.
- Ask each builder to mark every item included, excluded or provisional.
- Price the excluded items at market rates and add them to that builder’s total.
- Now compare.
The rate per square metre is worth knowing as a sanity check. If a quote works out at $1,500/m² for a full specification turnkey build, something is either excluded or the specification is well below what you are imagining. If it works out at $4,500/m², ask what is driving it, because there may be a good reason such as a difficult site or a high specification.
How the rate changes with size
| Size | Typical floor area | Effect on the rate |
| Studio | 35m² to 45m² | Highest rate, lowest total |
| 2 bedroom | 50m² to 60m² | Middle rate |
| 3 bedroom | 60m² | Lowest rate, highest total |
The practical takeaway: if your block allows the full 60m² and your budget can reach it, building smaller saves less than you might expect. You still pay for the kitchen, the bathroom and the connections.
Frequently asked questions
What is a normal per square metre rate for a Sydney granny flat in 2026?
Published guides put it between $2,200 and $3,300 per square metre for a medium to high specification brick veneer build. Where a specific project lands depends on the specification, the size and the site.
Why is my quote higher per square metre than the published range?
Common reasons are a difficult site, a higher specification, a smaller floor area spreading fixed costs further, or a quote that includes items other builders exclude. Ask which of those applies rather than assuming the quote is high.
Is a cheaper rate per square metre always better value?
No. The rate says nothing about what is included or what specification you are getting. A lower rate with a long exclusion list frequently costs more once you finish the job.
Does the rate include approvals?
Usually not. Approval costs, including the survey, soil test, engineering, BASIX and the certifier or council fees, are normally quoted separately. Ask specifically.
How do I sanity check a quote using the rate?
Divide the total build price by the floor area and see where it lands against the $2,200 to $3,300 range. Then ask what is excluded. If the rate looks low and the exclusion list is long, you have your answer.
Get a total, not a rate
A rate per square metre is a market average. What you need is a total for your block, with the inclusions and exclusions written down.
Book a site assessment, or call BlueGum on 1300 060 651.
BlueGum Granny Flats is a licensed NSW builder, licence number 247388C. Rates in this article are drawn from published 2026 Sydney market guides and are indicative only. They are not a quote.
