How much will your extension cost?
Answer six quick questions and get a ballpark figure instantly, based on real Christchurch projects we’ve built. Free, no obligation.
- ✓ Rough estimate (site visit recommended for an accurate estimate)
- ✓ Built on 100+ completed local projects
- ✓ Sent straight to your inbox, free with no obligation
Typical range in Christchurch: $3,000–$5,000 per m². Estimates are indicative, not a quote.
House Extension Calculator
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Please fill in your details below and your results will be sent straight to your email inbox. (double-check junk mail folder)About this estimate
Rough ballpark figures based on average Christchurch extension and renovation costs from past projects. Every house is different — this isn’t a fixed quote. For an accurate estimate, contact us directly.
Average cost
Christchurch and Selwyn extensions typically run $3,000–$5,000 per m², depending on design complexity, materials, size, room type, and site conditions. Prices reflect Christchurch-region averages; other regions may vary.
Architect fees
Typically $7,000–$15,000 for an extension, depending on scope — covering design, structural compliance, and council requirements.
Renovation Green Loans
To help fund your home extension, top up your home loan with a green loan from ANZ, Westpac, ASB, or BNZ.
Access a 0% or low‑interest rate to make your home warmer, drier, and more energy‑efficient.
Learn More