How much does a builder cost in Sydney?
A single-storey extension in Sydney is priced by the square metre: $2,500–$5,000 in our table, typically $3,500, so the floor area you add sets most of the bill. Building up is a different scale of job, with a second-storey addition at $250,000–$600,000, while a knock-down rebuild runs $450,000–$1,000,000. Housing here is denser than the national picture: separate houses make up only 55.8% of dwellings, and flats or apartments 30.7%, against 72.3% and 14.2% across Australia (ABS 2021 Census). Many projects therefore happen on narrow lots, beside shared walls or under strata rules, and those conditions move a quote as much as the design does.
Comparing cities, or after the Australia-wide picture? See the national guide: Builder cost in Australia.
Detailed Pricing — Building Cost in Sydney 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 Sydney quotes →Renovate, Extend or Rebuild in Sydney?
Three ways to get more house in Sydney, priced from the table: a whole-home renovation at $150,000–$600,000, a single-storey extension at $2,500–$5,000 a square metre, or a knock-down rebuild at $450,000–$1,000,000. Every one is over NSW’s Home Building Compensation insurance threshold of $20,000, so check the builder’s cover before paying anything, deposit included.
Common Building Projects and What They Cost
Home extensions
At $2,500–$5,000 a square metre, a 30–50 m² extension comes to $75,000–$250,000 before approvals and finishes.
Second-storey additions
Adding a level is $250,000–$600,000, most of it structural: footings, frame, stairs and roof.
Granny flats
A turnkey one- or two-bedroom flat is $120,000–$250,000 in this table.
Knock-down rebuilds
A 3–4 bedroom single-storey rebuild is $450,000–$1,000,000; demolition comes first, usually under a complying development certificate.
Home Extensions and Second-Storey Additions in Sydney
Extensions here are priced per square metre ($2,500–$5,000) and second storeys as whole projects ($250,000–$600,000). Doing it yourself? An owner-builder permit is needed for work over $10,000, and from $20,000 the owner-builder course is required.
Knock-Down Rebuild vs Renovation in Sydney
Knocking down in Sydney usually goes through a complying development certificate under the state Demolition Code — the City lists the site plan, plans, certification contract and owner’s consent it needs. Before any asbestos comes out, neighbours next door and opposite must be told in writing. A rebuild is $450,000–$1,000,000 against $150,000–$600,000 to renovate the whole house.
What's Included in a Builder's Quote
In NSW a builder can take no more than a 10% deposit, contracts over $20,000 carry a five-clear-business-day cooling-off period, and jobs of $5,000–$20,000 use a small job contract, bigger ones a large job contract. A pre-purchase or defect inspection before you commit is $400–$1,200 in our table.
What Affects Builder Costs in Sydney
Which approval route
A lot of Sydney home building can go through complying development, a combined planning and construction approval decided by the council or an accredited certifier, and NSW Planning says it can be issued in as little as 20 days. A design that falls outside the codes needs a development application instead, with its own reports and a longer wait. Ask early which path your plans suit, because the route shapes both the program and the fees around the build.
Licence, contract and HBC cover
In NSW a builder needs a contractor licence for residential building work valued at more than $5,000, and work above that figure needs a written contract. Past $20,000 the builder must take out home building compensation (HBC) cover and hand you its certificate before asking for any payment, deposit included. The deposit itself can be no more than 10 percent, and the larger contracts must spell out a cooling-off period of five clear business days.
Shared walls and narrow lots
Semi-detached homes, terraces and townhouses make up 12.8% of Sydney dwellings (ABS 2021 Census), and many sit hard against a boundary. Under the NSW Demolition Code, removing a wall within 900 mm of a boundary when the neighbour also has a wall within 900 mm needs an adjoining wall dilapidation report. Hand-dug footings, materials carried down a hallway and nowhere to park a skip all add labour to a job that looks simple on paper.
Opening up the inside
Internal demolition is often the first step of an open-plan rework. Taking out a load-bearing wall and fitting a steel beam is $3,000–$15,000, and the engineer's beam size decides where in that band you land. Smaller structural fixes such as a new lintel, crack stitching or wall ties run $500–$5,000, and a defect report ($400–$1,200) can find them before you commit.
Asbestos in older houses
Older Sydney homes can hide asbestos in eaves, wet areas and wall sheeting. NSW law requires a licensed removalist for removing over 10 m² of bonded (non-friable) material, or any friable asbestos at all, and a demolition complying development certificate for an older building is approved only if the asbestos can be removed safely. In the City of Sydney council area, neighbours adjoining or opposite must also be told in writing before removal starts.
A wet first half of the year
At Observatory Hill, March and June are the wettest months, each averaging above 130 mm, while September is the driest at 68.1 mm (BOM averages). Excavation, slab pours and the weeks a second storey spends with its roof open are the stages rain hurts most. A program that lands them in late winter or spring carries less weather risk and fewer lost days, which a builder may reflect in the price.
Apartments and strata
With close to a third of Sydney homes in apartment buildings, plenty of builder-managed kitchens ($20,000–$70,000) and bathrooms ($15,000–$45,000) happen inside a strata scheme. Expect the owners corporation to want approval for work touching common property such as waterproofing, plumbing stacks or structure, plus rules on lift bookings, noisy hours and rubbish removal. A builder prices that extra coordination into the quote.
How to Save Money on Building Cost in Sydney
Frequently Asked Questions — Building Cost in Sydney
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 →