Nobody knows what a renovation costs until the walls come off.
Renovation is the least quotable job in building, which is why the honest Christchurch firms publish ranges instead of prices: extensions at $90,000–$200,000+, full renovations at $100,000–$700,000+. The city's split personality matters here: post-quake subdivisions renovate predictably, while pre-quake character homes can hide anything, including someone else's earthquake repair shortcuts.
Is this your stream?
Extensions, reconfigurations, second storeys, garage conversions and full do-ups of character homes. Almost everything is quoted after scoping, and the honest builders publish their guide ranges up front.
A kitchen or bathroom on its own belongs to the kitchen and bathroom stream, where specialists run repeatable processes. A wet room inside a wider renovation stays here as one line item of the bigger contract.
What it costs in Christchurch
Same-level extensions
Refresh Renovations' Christchurch guide puts same-level extensions at $90,000–$200,000+. Elite Built guides medium extensions (kitchen plus dining or 2–3 rooms) at $90k–$150k and large-scale work at $150k+.
Mid to high-spec work
Gareth Davis Builders' 2026 Christchurch guide puts mid to high-spec renovations at $3,000–$4,000+/m². Janssen Contractors guides simpler room additions at $1,800–$3,000/m². Spec and wet-room content explain the gap.
Partial to full renovations
The same Gareth Davis guide puts partial renovations at $100,000–$300,000+ and full renovations at $300,000–$700,000+. Full character do-ups belong at the top of that range, and surprises live there too.
Christchurch providers, compared
Six builders that run renovations across Christchurch and Canterbury, grouped by what they are best at. Hover a row for the detail that matters.
Common mistakes
Quoting a character home like a new build: pre-quake villas and bungalows in Fendalton, Merivale and St Albans hide rot, borer, old wiring and undocumented alterations, including repair-era work from after the earthquakes. Builders who quote old-house work regularly price the unknowns; the cheapest quote on a villa usually just has not found them yet.
Not asking about the repair history: many Christchurch homes had earthquake repairs between 2011 and 2016, and the quality varied enormously. Before renovating, find out what was repaired, by whom, and whether the paperwork exists, because you may be renovating on top of someone else's shortcuts.
Skipping the envelope while the walls are open: Canterbury winters are cold and long. A renovation that opens walls without upgrading insulation, glazing and ventilation misses the once-in-a-decade chance to fix the cold, and retrofitting later costs far more.
Treating the extension per-m² guide as the quote: local guides span $1,800–$3,000/m² (Janssen) to $3,000–$4,000+/m² (Gareth Davis) depending on spec and complexity. The spread is real: kitchens, bathrooms and structural work cost more per metre than bedrooms.
Forgetting the consent trigger: extensions, structural changes and moved plumbing need building consent through Christchurch City Council, and restricted building work needs an LBP. A builder who says 'we don't need consent for that' without checking is a risk, not a shortcut.
Living through it without a staging plan: full renovations of occupied homes need a sequence: which rooms first, where does the kitchen go, when is the water off. Refresh and Elite Built both run managed processes for exactly this reason.
FAQ
How much does a renovation cost in Christchurch?
Local guides: Gareth Davis Builders puts mid to high-spec renovations at $3,000–$4,000+/m², partial renovations at $100,000–$300,000+ and full ones at $300,000–$700,000+. Refresh Renovations puts same-level extensions at $90,000–$200,000+, and Elite Built guides medium extensions at $90k–$150k with large-scale work above $150k. Every real number is quoted after scoping.
Do I need a building consent for a renovation?
Extensions, structural alterations, new wet areas and moved plumbing fixtures generally need building consent through Christchurch City Council. Like-for-like cosmetic work usually does not. Work on structure or weathertightness is restricted building work and must be done or supervised by an LBP. Ask your builder to confirm the consent position in writing.
Should I renovate or rebuild?
On post-quake subdivisions, rarely a question. On pre-quake character homes, price both: a full renovation at $300,000–$700,000+ against a new build at $2,300–$3,500/m². Renovation keeps the character and the location; rebuilding gets you modern everything. The tiebreaker is usually the condition of what is behind the walls.
How do I check a builder for a big renovation?
Three checks: the LBP register at lbp.govt.nz for the individuals, membership of Master Builders or NZ Certified Builders for the company and its guarantee, and recent local references you can actually call. For a six-figure renovation, also ask how variations are priced and what the payment schedule ties to.
How long does a renovation take?
A medium extension runs three to five months on site; a full renovation six months and up, plus design and consent time at the front. Christchurch City Council consent processing and material lead times are the usual front-end delays, so the honest timeline includes the months before the first hammer.
Extensions run $90,000–$200,000+ and full renovations $100,000–$700,000+ in local guides, and every real price is quoted after the walls are scoped. Gareth Davis, Elite Built and Refresh publish their ranges; Janssen and Pete's suit hands-on owners; Smith & Sons does nothing but renovations. Check the quake repair history before you price anything, upgrade the envelope while the walls are open, and get the consent position in writing.