Builder Job Guide
Hire a licensed Builder for Extension Build
An extension build covers site preparation, structural work and finishes, with site conditions and chosen finishes strongly affecting the project's scope.
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Estimated range
National average$23,895 – $1,515,295
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Which best describes the size of the addition you want?
Live Estimate
$23,895 – $1,515,295
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Pricing guide
The cost of an extension is driven by structural requirements, site preparation or remediation, and the finish level you select. Engineer-led works, heavy demolition or bespoke premium finishes typically increase materials and specialist labour, while plans, permits and project readiness can also affect the final quote.
Finish level and bespoke items
Premium or custom finishes usually increase material and specialist labour requirements and may extend lead times.
Demolition and remediation needs
Significant demolition, hazardous removal or repair of poor foundations generally adds scope through specialist disposal and site remediation.
Site and foundation conditions
Sloping sites, unusual ground or specialist foundation needs typically require additional preparation and can lengthen the build programme.
Plans, permits and project readiness
Having plans and permits ready usually simplifies pricing, while incomplete documentation or council requirements often add time and provisional allowances.
Estimated range
$23,895 – $1,515,295
Based on common scope patterns and current market rates.
- Under 10$13,895 – $56,495
- unsure$23,895 – $1,515,295
- 10 20$35,795 – $95,295
- 20 50$69,595 – $215,295
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