Builder Job Guide
Find a Builder for Home 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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What we'll ask you
4 quick questions for your estimate
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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
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Answer the estimate questions to refine the scope.
What moves this estimate
- 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.
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Frequently asked questions
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