There is no single cost per square metre to build a house in Queensland, because a $/m² rate is not a price. It is the answer to a division. Someone takes a contract price, divides it by a floor area, and quotes the result. Change what sat inside that contract price, or change which floor area went on the bottom of the sum, and the same house on the same block produces two rates that look nothing alike. So the useful question is never “what is the rate on the Sunshine Coast?” It is “what went into the top of that fraction, and what went into the bottom?” This guide answers both.
A rate is an output, not a quote
Builders do not price houses by the square metre. We take off quantities, price trades, add preliminaries and margin, and arrive at a contract sum. The $/m² figure gets calculated afterwards, usually by someone else, for marketing or a bank valuation. Like every summary statistic, it hides the things that cost money.
Queensland contract law is built around that fixed sum, not a rate. The QBCC requires a written contract for domestic building work priced over $3,300 including labour, materials and GST, and sets contract levels by value. For renovations, extensions and routine repairs on an existing home, a Level 1 contract covers $3,301 to $19,999 and a Level 2 contract covers work of $20,000 and over; building an entire new home or duplex uses a separate new home construction contract. At $20,000 or more, QBCC requires the building contractor to give you a copy of the QBCC consumer building guide before you sign. Nothing in that framework mentions a square metre. What you sign is a number, and that number is what you hold a builder to — see fixed price building contracts in Queensland.
What is and is not inside a cost per square metre rate
Two builders can quote rates hundreds of dollars per square metre apart and both be honest, because they have drawn the line in different places. Work down this list and ask which side each row sits on. Anything marked “outside” still gets paid for by you.
| Cost item | Inside a typical builder’s $/m² rate? | What decides it |
|---|---|---|
| Slab or footings on a flat, benched, stable site | Inside | Soil classification under AS 2870 Residential slabs and footings, from a site-specific soil test |
| Frame, roof structure, cladding, roofing | Inside | Wind classification under AS 4055 Wind loads for housing for the site’s terrain and exposure; span and roof pitch |
| Windows and external doors | Inside | Glazing performance for the energy provisions; coastal corrosion and wind ratings |
| Internal linings, doors, architraves, skirting, paint | Inside | Ceiling heights, square-set versus cornice, number of internal corners |
| Kitchen, bathroom and laundry fitout | Inside, but usually as a prime cost or provisional sum | The allowance nominated in the contract, not the fitout in your head |
| Preliminaries, supervision, scaffold, insurances, builder’s margin | Inside | Build duration, site access, overheads |
| Floor coverings, window furnishings, appliances | Often outside, or a nominated allowance | Whether the scope says “supply and install” or “by owner” |
| Cut and fill, retaining, rock excavation, piering, suspended slabs | Almost always outside a headline rate | Slope, soil, rock and stormwater on your block |
| Service connections: power, water, sewer, stormwater, NBN | Usually outside | Distance to existing mains; each authority’s requirements |
| Driveway, paths, fencing, letterbox, clothesline, turf, landscaping | Outside | Site area and any council landscaping conditions |
| Pools, decks, pergolas, outdoor kitchens, sheds | Outside | Separate scope, often separate approvals |
| Design, engineering, soil test, energy assessment, survey, certification | Usually outside | Consultant fees, incurred before a builder’s contract exists |
| Council infrastructure charges and approval fees | Outside | The local charges resolution — on the Sunshine Coast, Infrastructure Charges Resolution (No. 9) 2022, which has effect on and from 28 March 2022 |
| Queensland Home Warranty Scheme premium | Inside the contract price, and statutory | Insurable value of the work; QBCC makes the scheme compulsory for residential construction work valued at more than $3,300 |
| QLeave portable long service leave levy | Statutory, often shown separately | QBCC counts it within labour in insurable value for projects valued at more than $150,000 excluding GST |
| Demolition or removal of an existing dwelling | Outside | Asbestos, service disconnections, character or heritage status |
| The land | Always outside | Nothing to do with the builder |
Which floor area went on the bottom of the sum?
The denominator is where most of the mischief happens, and almost nobody asks about it. A house with a generous alfresco, a double garage and wide eaves has at least three defensible floor areas: air-conditioned living area, area under roof, and the total including garage and covered outdoor space. Garages and covered outdoor space cost far less per square metre than a kitchen or a bathroom, so a builder quoting on “under roof” area will always show a lower rate than one quoting on living area — same house, same price, neither of them lying. Ask which area was used, then ask for the contract sum instead. A contract sum cannot be massaged by redefining a boundary.
For scale, the ABS reports the average floor area of new houses in Queensland was 226.1 m² in 2021-22, against a national average of 232.3 m² and a national peak of 245.9 m² in 2008-09. That is a state-wide average across every new house built, so treat it as a reference point rather than a benchmark for a custom build on the coast.
The statutory costs no rate reflects
Some of what you pay is set by law and moves with the contract price, not the floor area. The Queensland Home Warranty Scheme is the clearest example. QBCC makes it compulsory for residential construction work valued at more than $3,300 including the cost of materials, labour and GST, and states that the premium is collected from you and paid to QBCC by the contractor, is included as part of your contract, and is paid before work begins.
QBCC caps what the scheme pays at $200,000 each for refunding a deposit or finishing incomplete work and repairing defects, for repairing damage caused by fire, storm or tempest to incomplete works, and for fixing defects and subsidence in the work after the project is completed. Those maximums rise to $300,000 if you take the optional additional cover. Sitting inside those caps, not on top of them, is a sub-limit of $5,000 — $10,000 with the optional cover — for alternative accommodation, removal costs and storage costs.
QBCC also publishes how the premium is calculated: on the insurable value of the work, being materials even where they are supplied by others, labour — which QBCC says includes the cost of the QLeave levy for projects valued at more than $150,000 excluding GST — and GST, but excluding the QBCC premium itself. QBCC notes that insurable value also picks up associated work such as landscaping, driveways, fences, retaining walls, air conditioning and hot water systems, even though most of that sits outside a headline building rate. None of it is per square metre. It all scales with the contract sum, which is one more reason the contract sum is the number worth arguing about.
What moves the rate on Sunshine Coast and Noosa blocks
Around Coolum Beach, Yaroomba, Marcus Beach, Noosa Heads and Pelican Waters, the site does more to the rate than the house does. Slope drives retaining, piering and suspended slabs, and that curve is not gradual — it steps every time an excavator can no longer work off natural ground. Sand and reactive clay call for different footing systems under AS 2870 Residential slabs and footings. Coastal exposure changes fixings, flashings and glazing. Bushfire-prone land brings the construction requirements of AS 3959 Construction of buildings in bushfire-prone areas. Overlays under the Sunshine Coast Planning Scheme 2014, or the Noosa Plan 2020 in Noosa Shire, can lift a project from a building approval into a development application, adding consultants and time before a trade turns up.
A rate borrowed from a flat estate block therefore tells you little about a sloping site at Ninderry. If your block falls away, start with building on a sloping block in Queensland before you compare rates at all.
How to use a rate without getting burned
A rate is fine as a sanity check and useless as a budget. Use it at concept stage to test whether a brief is roughly affordable, then drop it once you have drawings and move to a quantity-based estimate. At that point, do three things: ask which floor area was used; ask for inclusions and exclusions in writing, row by row, against the table above; and check the builder’s licence class and history on the QBCC register using how to check a QBCC licence.
Roebuck Concepts builds one-off homes across the Sunshine Coast and Noosa Shire, including the Grandview project at Coolum Beach, which won three Master Builders Queensland 2025 Sunshine Coast Housing & Construction Awards. We price from drawings and a defined scope, not from a rate. If you are testing a budget against a real block, see new home builds on the Sunshine Coast and the cost to build a house on the Sunshine Coast.
Frequently asked questions
Is a cost per square metre rate ever reliable?
Inside a narrow band, yes: the same builder, the same product type, comparable block conditions and the same floor area definition. That is roughly a volume builder’s position on an estate. For a one-off house on a coastal or sloping block, the variation between sites swamps the rate.
Why is a renovation rate higher than a new build rate?
You are paying for the existing building as well as the new work: demolition, propping, making good, and bringing older elements up to current code. The floor area you divide by does not grow, but the work does. See renovation cost per square metre in Queensland.
Does a quoted rate include GST?
Sometimes, and you have to ask. The statutory numbers you meet in Queensland are expressed GST-inclusive: QBCC states its written-contract threshold as work priced over $3,300 including labour, materials and GST, and applies the Queensland Home Warranty Scheme to work valued at more than $3,300 including the cost of materials, labour and GST. A quoted rate, though, is not a contract, and rates lifted from trade or valuation sources are often exclusive. Ten per cent is enough to make one builder look cheap.
Do council charges get added to the rate?
No. Infrastructure charges are levied by the local government on new development under its charges resolution — on the Sunshine Coast, Infrastructure Charges Resolution (No. 9) 2022, which has effect on and from 28 March 2022 — and sit outside your building contract. Confirm the charge for your proposal with the council, as charges vary with dwelling type and location.
What number should I budget against?
A fixed contract sum with a written schedule of inclusions, exclusions, prime cost items and provisional sums, plus a separate allowance for the consultant fees, statutory charges and external works outside that contract. That total is your project cost. The $/m² figure is something you work out afterwards, out of curiosity.