How much does a builder cost?
Small structural jobs with a builder start around $4,000–$10,000, major renovations commonly run $30,000–$80,000, and extensions $120,000 or more.
Typical price band
$50,000typical
$4,000 low$300,000 high
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Real-world examples
Small structural works$4,000 – $12,000
Major renovation$30,000 – $80,000
Extension or second storey$120,000 – $350,000
What affects the price
— Scope & structural complexity. Load-bearing changes, footings and roof work multiply trades, engineering and time.
— Materials & finish level. Standard versus architectural finishes can swing an identical floor plan by tens of thousands.
— Site access & condition. Tight access, sloping blocks and older homes with hidden defects all add labour.
— Approvals & engineering. Council or certifier approvals, engineering and surveys add cost and lead time before work starts.
— Provisional sums & exclusions. Quotes with vague allowances for tiles, fittings or excavation often blow out later.
Tips before you post
— Check the builder holds a current licence or registration for your state and ask about home warranty insurance — it's mandatory above a threshold in most states.
— A fixed-price contract with a detailed scope beats a cheap, vague quote nearly every time.
— Compare quotes line by line — the cheapest often just excludes more.
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Indicative range only, not a quote. Get quotes from local tradies for an exact price. Last updated 13 July 2026.
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