How much does a home extension cost in Adelaide in 2026?
Published guides put Adelaide extensions at roughly $2,000 to $5,500 per square metre. Here is what those ranges include, and what actually moves your price.
Read the guideBuilding & renovation guides
Straight answers on extensions, approvals, rebuilds and bathrooms in Adelaide and the northern suburbs, with the SA rules linked to their official sources. Written by ASP Build & Co, licensed builder BLD 360698.
Do you need council approval for a home extension in SA?
Almost always, yes. Here is how planning consent, building consent and the PlanSA process work for a home extension in South Australia.
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Ground-floor or second-storey extension: which suits your block?
Building out is usually simpler per square metre. Going up keeps your yard. Here is how to decide which extension suits your block and budget.
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Knock down and rebuild, or renovate and extend? A guide for Adelaide's north
When a sound house just needs more space, extend. When the structure or layout fights you everywhere, a rebuild can be the smarter money. How to tell.
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Bathroom waterproofing in SA: what the rules require
Shower floors waterproof, shower walls to at least 1800 mm, junctions and penetrations sealed. What the code requires, and what to ask before you renovate.
Read the guidePlanning a renovation, extension or new home? Talk to Anthony about your project.