How much does a builder cost in Brisbane?
Brisbane builders price an extension by the square metre, and our table puts a single-storey addition at $2,500–$5,000, typically $3,500. Going up instead of out is a bigger commitment: a second-storey addition is priced at $250,000–$600,000, and knocking down a three- or four-bedroom home to rebuild it runs $450,000–$1,000,000. Houses here already run large, with 41.1% of dwellings holding four or more bedrooms against 34.8% nationally (ABS 2021 Census), so plenty of projects rework a big existing home rather than add rooms to a small one. Character overlays, a stormy wet season and Queensland's QBCC contract rules all shape the final figure.
Comparing cities, or after the Australia-wide picture? See the national guide: Builder cost in Australia.
Detailed Pricing — Building Cost in Brisbane 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Minor structural repair (lintel, crack stitching, wall ties) | $500per job | $1,800 | $5,000 |
| Load-bearing wall removal + steel beam | $3,000per job | $8,000 | $15,000 |
| Pre-purchase building inspection / defect report | $400per job | $600 | $1,200 |
| Deck or pergola (builder-managed) | $5,000per project | $12,000 | $40,000 |
| Roofed patio / alfresco (builder-managed) | $12,000per project | $20,000 | $35,000 |
| Garage or carport (single to double) | $10,000per project | $25,000 | $55,000 |
| Bathroom renovation (builder-managed) | $15,000per project | $25,000 | $45,000 |
| Kitchen renovation (builder-managed) | $20,000per project | $35,000 | $70,000 |
| Single-storey extension (per sqm) | $2,500per sqm | $3,500 | $5,000 |
| New home build (per sqm, standard finish) | $1,600per sqm | $2,300 | $4,500 |
| Granny flat (1-2 bed, turnkey) | $120,000per build | $165,000 | $250,000 |
| Full home renovation (whole house) | $150,000per project | $300,000 | $600,000 |
| Second-storey addition | $250,000per project | $380,000 | $600,000 |
| Knock-down rebuild (3-4 bed, single storey) | $450,000per build | $650,000 | $1,000,000 |
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Get Brisbane quotes →Renovate, Extend or Rebuild in Brisbane?
In the Brisbane table, renovating the whole house is $150,000–$600,000, extending $2,500–$5,000 a square metre and rebuilding $450,000–$1,000,000. Work over $3,300 needs a QBCC-licensed builder, and the state home warranty pays up to $200,000.
Common Building Projects and What They Cost
Home extensions
30–50 m² of extension at $2,500–$5,000 a square metre: $75,000–$250,000.
Second-storey additions
A second storey is $250,000–$600,000.
Granny flats
A turnkey one- or two-bedroom flat: $120,000–$250,000.
Knock-down rebuilds
A 3–4 bedroom single-storey rebuild: $450,000–$1,000,000.
Home Extensions and Second-Storey Additions in Brisbane
Brisbane says building approval from a licensed certifier may be needed before any demolition, and extensions are $2,500–$5,000 a square metre here. Contracts of $20,000 or more are Level 2, with the QBCC consumer guide given before signing.
Knock-Down Rebuild vs Renovation in Brisbane
Brisbane needs planning approval to demolish on heritage-listed sites, in the pre-1911 overlay, or in the traditional building character overlay for a house built before 1946. In a principal or major centre zone, any demolition needs planning approval. Rebuild $450,000–$1,000,000, renovate $150,000–$600,000.
What's Included in a Builder's Quote
Deposits are capped at 10% on work of $3,301–$19,999 and 5% from $20,000. You generally have five business days to withdraw. A pre-purchase or defect report is $400–$1,200 in this table.
What Affects Builder Costs in Brisbane
QBCC licence and home warranty
Queensland requires a QBCC licence for building work valued over $3,300, and on residential construction above that same figure the home warranty premium is compulsory. The Queensland Home Warranty Scheme is run by the QBCC, lasts 6 years and 6 months, stays with the house if you sell and pays up to $200,000 on claims. Owner-builders cannot use the scheme, which is worth weighing before you manage a job yourself.
Deposits and contract levels
Once work passes $3,300 you need a written contract, signed and dated by you and the builder before anything starts, and at $20,000 or more it becomes a Level 2 contract. The deposit is capped at 10 per cent below that line and 5 per cent above it. You generally get five business days to cool off, though pulling out usually costs $100 plus the builder's reasonable out-of-pocket expenses.
Character overlays and demolition
Brisbane City Council requires planning approval to demolish on a heritage-listed site, in the pre-1911 building overlay, or in the traditional building character overlay where the whole building dates from before 1946. That shapes knock-down rebuilds and any extension that removes part of an older house. Check the City Plan overlays before paying for drawings; a free-standing outbuilding built after 1946 can come down without planning approval.
Asbestos in older homes
In Queensland a tradesperson removing more than 10 m² of bonded asbestos needs a class B or class A removal licence, and the job cannot be broken into smaller lots on different days to slip under that limit. Friable material, which includes some old felt carpet underlay, is A-class work only. Older eaves, wet-area linings and wall sheeting are the places to have tested before demolition is priced.
Storms and the wet summer
At the Brisbane station February averages 176.1 mm of rain and December and January each top 135 mm, while July, August and September each average under 35 mm (BOM averages). Slab pours and roof-off stages move faster in the dry months. Brisbane also sits in wind region B, where homes must be designed to resist weakened tropical cyclones, so roof tie-downs are part of any new structure.
Know the house before you quote
A pre-purchase building inspection or defect report is $400–$1,200, and it can flag cracked brickwork, a failed lintel or tired wall ties, repairs that run $500–$5,000. Removing a load-bearing wall to open up a floor plan, with a steel beam put in its place, costs $3,000–$15,000. Order your own soil test and survey too, so each quote rests on the same ground conditions.
Covered outdoor living
Brisbane is in NCC climate zone 2, warm humid summers and mild winters, which makes a roofed alfresco worth pricing alongside an extension; builder-managed, it runs $12,000–$35,000. Any roofed deck or patio needs building approval from a licensed building certifier, since only a small, low, unroofed deck of 10 m² or less with no side over 5 m is exempt. A garage or carport costs $10,000–$55,000.
How to Save Money on Building Cost in Brisbane
Frequently Asked Questions — Building Cost in Brisbane
Our Methodology
Prices on this page are compiled from publicly available cost guides, leading tradie marketplaces, peak industry body data, and individual tradesperson websites across Australia. We cross-reference ranges from multiple sources and adjust for city-specific cost differences. Our price guides are produced independently and no tradesperson can influence a published figure. All prices are estimates and will vary based on your specific job. Always get multiple quotes. Last reviewed June 2026. Read our full methodology →