How much does a home extension cost in Sydney?

Ground-floor extensions in Sydney typically run $3,500–$5,500 per m² for a standard finish, and $5,500–$8,000+ per m² for premium builds. Second-storey additions usually sit $4,500–$7,000 per m² because of structural upgrades to the existing home.

Ground floor vs second storey — which is cheaper?

Ground-floor extensions are usually cheaper per m² because they avoid strengthening the existing structure and roof works. Second-storey adds engineering, existing-floor reinforcement, roof removal and re-cladding, which pushes the rate up.

Do I need DA or CDC approval?

Most Sydney extensions go through either a Complying Development Certificate (fast-track, meets set criteria) or a Development Application to your council. We assess which pathway suits your block and design.

How long does a home extension take?

Design and approvals typically run 2–6 months. Construction is usually 4–8 months on site depending on size, storey count, and finish level. We give you a full sequence during quoting.

What drives cost up the most?

Second storey conversions, structural steelwork, natural stone/premium cladding, complex roof geometry, poor site access, and any wet-area rooms (extra bathrooms, kitchens or laundries) added to the extension.

Can you handle design and approvals?

Yes — we work with architects and building designers, prepare the drawings, engineering and BASIX, and lodge CDC or DA. Or we build to plans you've already had drawn.

Sydney renovation cost guides

Use these practical guides to understand budget drivers before requesting a quote. They support, rather than replace, a site-specific inspection and written scope.

Bathroom Renovation Cost Sydney

Understand bathroom renovation cost factors including waterproofing, tiling, fixtures, plumbing and layout changes.

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Kitchen Renovation Cost Sydney

Plan your kitchen renovation budget around cabinetry, benchtops, appliances, trades and structural changes.

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Home Extension Cost Sydney

Review the major cost drivers for Sydney extensions, from structural work and approvals to fit-out level.

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Pergola Cost Sydney

Compare common pergola cost factors such as size, structure, roofing, electrical inclusions and finishes.

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Decking Cost Sydney

See what affects deck pricing, including access, subframe, timber or composite boards, stairs and balustrades.

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