Renovating an Old House in New Zealand: Two Years, Honestly

We went into our renovation with a plan that ran to about two months. A lick of paint, a new bathroom, maybe some carpet. Then the builder’s report came back, and two months turned into two years. That is the honest starting point for anyone thinking about renovating a house in New Zealand, especially an older one: the house always knows more about itself than you do, and it tells you in the order it chooses, not the order you’d prefer.

We bought our place on a lifestyle block outside Kerikeri in Northland, an old house that looked tidy enough on the surface and turned out to need a great deal more underneath. We lived in it the whole way through, sold it once the work and the subdivision were done, and learned most of what follows the hard way. This guide pairs that experience with what building consent, licensed building practitioners, asbestos and 2026 costs actually look like, verified against official sources in July 2026. It isn’t legal, financial or building advice: for anything specific to your own property, talk to a licensed building practitioner, your council’s building consent team, or a qualified inspector.

In this article

• The builder’s report that changed our two-month plan into a two-year one
• What actually needs a building consent, and what doesn’t (2026 rules)
• Restricted building work and why you’ll need a licensed building practitioner
• What hides behind old walls: asbestos, wiring and weathertightness
• What renovating actually costs in New Zealand in 2026
• Doing it rurally: tradies, timeframes and living in the middle of it
• Common renovation jobs: do you need consent?
• Your questions answered

A note on money before we get into figures: everything below is in New Zealand dollars first. As of mid-July 2026, NZ$1 buys roughly £0.43 or US$0.58 (exchangerates.org.uk and xe.com), so multiply any NZD figure by those to get a rough pounds or dollars equivalent. Rates move daily, so treat this as a guide, not a quote.

The builder’s report that changed everything

We’d looked at the place with the eyes most buyers use: does it feel right, is the layout workable, does the kitchen need doing. It did feel right. We made an offer conditional on a LIM report and a builder’s report, the two documents anyone buying an older New Zealand house should treat as non-negotiable, and went into the builder’s report expecting a list of minor notes to work through over a weekend or two.

Instead we got a document that quietly rearranged our next two years. Old rural houses hide their problems well. Ours had cosmetic layers over genuine issues with moisture, some tired wiring, and enough scope creep once we started pulling things apart that “tidy up and move in” became “renovate properly, room by room, while living in the middle of it.” If there’s one thing we’d tell anyone buying an older house here, it’s this: pay for a proper builder’s report, read every page of it, and price the worst-case scenario into your decision, not the best case. It is far cheaper than finding out afterwards.

What actually needs a building consent, and what doesn’t

This is the question everyone asks first, and the honest answer is that New Zealand’s rules changed meaningfully in the last year, so anything you read from before 2026 needs rechecking.

Most structural, plumbing, drainage or weathertightness work on an existing house needs a building consent from your local council before you start, full stop. But Schedule 1 of the Building Act 2004 sets out a genuine list of work that doesn’t, and it’s worth knowing well because it covers more than people assume. Like-for-like repairs and maintenance are exempt (replacing what’s there with the same thing, not upgrading it). So are small detached structures under 10 square metres, decks with a fall height under 1.5 metres, fences under 2.5 metres, most retaining walls under 1.5 metres with no surcharge load, and unroofed pergolas of any size. Single-storey detached buildings up to 30 square metres (without a kitchen or bathroom) can also go up without consent, provided a licensed building practitioner builds or supervises the work, or it’s a lightweight kit-set design built to an applicable standard, and carports up to 40 square metres qualify the same way.

The bigger recent change: from 15 January 2026, an amendment to the Building Act added Schedule 1A, a new, separate exemption (distinct from the general Schedule 1 list above) for small stand-alone dwellings, often called granny flats, up to 70 square metres, single storey and fully self-contained, without needing a building consent at all. It’s a genuinely significant shift, and it moves the responsibility for compliance onto the designer and builder rather than a council inspector. Two things matter here, though. First, exempt from consent is not exempt from the law: any exempt work still has to meet the Building Code in full, and you’re the one on the hook if it doesn’t. Second, this exemption is about new small dwellings, not renovations of an existing house, so don’t assume it covers work on your main home. If you’re weighing up a small standalone build alongside renovating, it’s worth reading MBIE’s current exempt building work guidance directly, since the detail matters more than the summary.

For everything else on an older house, structural alterations, moving or adding plumbing, changing cladding, altering the roofline, you’re almost certainly looking at a consent, and your council will want plans, sometimes an engineer’s input, and inspections at set stages before it signs off.

Restricted building work and licensed building practitioners

A second layer sits on top of consents: restricted building work (RBW). This covers work critical to a home’s structural soundness and weathertightness, primary structure, external moisture management, and fire safety design in multi-unit buildings. If your renovation touches any of that, and on an old house it usually does, the design and the construction must be done, or directly supervised, by a Licensed Building Practitioner (LBP). LBPs are licensed in specific classes: design, carpentry, roofing, brick and blocklaying, external plastering, foundations and site work, so the right licence depends on the job. Each LBP involved has to issue a Certificate of Design Work or a Record of Building Work once finished, which becomes part of your property’s paper trail for as long as you own it, and matters to whoever buys it after you.

We didn’t fully appreciate, going in, how much of an old house’s renovation counts as restricted building work almost by default. Bearing walls move, roofs get reworked, moisture barriers get replaced, and each of those pulls in an LBP and, usually, a consent. Budget the time for it as much as the money: council processing, LBP availability and inspection scheduling all add weeks you won’t see coming until you’re waiting on them.

What hides behind old walls

Older New Zealand houses hide three things reliably: asbestos, tired wiring, and moisture. None of them are visible from an open home.

Asbestos. If your house was built or last substantially renovated before 2000, treat any suspect material as if it contains asbestos until it’s tested, that’s WorkSafe’s own guidance, not just caution. Risk rises the older the house, and anything built or renovated before the mid-1980s deserves particular care. Common places it turns up: old cladding and soffit linings, guttering and downpipes, some vinyl flooring, and textured ceiling coatings. Get an accredited assessor to sample and send it to an IANZ-accredited lab before you disturb anything, and if it comes back positive, licensed removal is the only sensible route: this isn’t a weekend DIY job, and WorkSafe’s Approved Code of Practice sets out why. Budget for it before you start swinging a hammer, not after a sample comes back positive.

Old wiring and scrim. Many older New Zealand villas and bungalows were built with scrim (fabric-backed wallpaper lining) over timber lath, and wiring that predates modern safety switches, sometimes by decades. Neither is necessarily an emergency, but both usually surface the moment you open a wall, and rewiring is proper licensed electrician’s work regardless of whether the rest of the job needs a building consent.

Weathertightness and insulation. This is the one that genuinely surprised us. Older Kiwi houses were mostly built direct-fixed weatherboard, cladding nailed straight to the framing with no underlay or cavity behind it, because that’s simply how houses were built at the time. It wasn’t built with insulation, double glazing or a moisture-managed wall system in mind at all. Ceiling and underfloor insulation are usually straightforward retrofits that don’t touch the rest of the house. Wall insulation is a different problem: adding it to a direct-fixed weatherboard wall without proper design can trap moisture inside the wall cavity rather than solve anything, which is exactly the kind of hidden damage that shows up years later as rot. Get advice from someone who understands old New Zealand wall construction specifically before you insulate walls, not just a general contractor.

What renovating actually costs in New Zealand in 2026

Costs vary enormously by region, scope and how much your particular house decides to fight you, so treat every figure here as a rough guide, and get several written quotes before committing to anything.

As a broad national range, home renovations in New Zealand are running at roughly NZ$2,000 to $4,000 per square metre in 2026, including GST, with a mid-range renovation (structural work, modern insulation, decent finishes, code-compliant electrical) more typically $2,500 to $3,500 per square metre. Auckland tends to sit at the top of that range or above it, sometimes $4,500 to $5,500 per square metre for higher-spec work, while other regions can come in lower. On top of whatever quote you get, build in a genuine 15 to 20% contingency, and lean toward the higher end of that if your house predates 1990, since hidden issues (asbestos, borer, old plumbing, rotted subfloor framing) tend to cluster in older stock.

For trades charged by time rather than by the job, hourly charge-up rates for builders in New Zealand generally sit around NZ$45 to $100 an hour, with the exact figure depending heavily on region and the trade’s experience; Auckland and Wellington tend to run toward the top of that band, provincial and rural rates often less. Materials have been relatively settled through 2026 so far, residential building costs rose only modestly over the past year, but pressure is building on specific materials: structural timber, cladding systems and concrete have all moved up faster than the headline figure recently, which is worth factoring in if your project is timber or cladding-heavy. Get quotes locked in as early as you sensibly can, and revisit them if your project runs long.

Doing it rurally: tradies, timeframes and living in the middle of it

Renovating in Northland rurally is a genuinely different experience from renovating in a city, and nobody warned us clearly enough beforehand. Good tradies exist, and the ones we worked with were excellent, but there simply aren’t as many of them spread across a much bigger area, and the good ones are usually booked out well in advance. A job that might get three quotes within a week in Auckland can take considerably longer to even get looked at rurally, and once you’re on someone’s books, weather, other jobs and travel time between properties all eat into how fast things actually move. Build slack into every timeline you’re given. We did, and still needed more of it.

Living in a renovation the whole way through, on a working lifestyle block with animals and an orchard to look after alongside it, is its own kind of test. Dust becomes part of daily life. Rooms close for weeks at a time. Plans you made in month three get quietly abandoned by month nine because the house has shown you something new. What got us through was treating the two-month plan as fiction from fairly early on and judging progress by rooms finished rather than a calendar we’d stopped trusting. If you can decant somewhere else for the heaviest phases, structural work, rewiring, anything involving asbestos removal, it will save you a great deal of stress; if you can’t, plan for it properly rather than hoping it’ll be fine.

Common renovation jobs: do you need consent?

Job	Building consent needed?	Notes
Repainting, recarpeting, cosmetic refresh	No	Genuine like-for-like maintenance is exempt
Replacing a kitchen or bathroom like-for-like	Usually no	Only if layout, plumbing and waterproofing stay the same
New deck, fall height under 1.5m	No	Schedule 1 exemption; check your council doesn’t want a producer statement anyway
Small detached shed or sleepout under 10m²	No	Schedule 1 exemption
Detached building up to 30m², no kitchen/bathroom	No	Must be built or supervised by an LBP, or a certified kit-set design
New self-contained small dwelling up to 70m², single storey	No building consent (from 15 January 2026)	Still must fully meet the Building Code; LBP design and build required
Removing or altering an internal load-bearing wall	Yes	Restricted building work; needs an LBP and consent
Rewiring or adding new circuits	Yes	Registered electrician required regardless; usually needs consent too
Replacing cladding or fixing a weathertightness issue	Yes	Restricted building work; LBP required
Adding or moving bathroom/kitchen plumbing	Yes	Triggered by drainage and plumbing changes

General guide only, based on Schedule 1 of the Building Act 2004 (general exemptions) and Schedule 1A (the small stand-alone dwelling exemption), both as at 15 January 2026. Confirm your specific project with your local council before starting, since some categories have conditions not captured in a summary table.

Our honest take, two years on

Would we do it again? Yes, but we’d go in with our eyes open in a way we didn’t the first time. The builder’s report wasn’t wrong to turn our plan upside down, it was doing exactly its job, and the two years that followed gave us a house (and eventually a subdivided section) worth far more than the tidy-up we’d originally budgeted for. What we’d change is the assumption underneath the whole thing: that an old house that looks fine is fine. It rarely is. Price the worst case, hire licensed people for the work that legally requires them, and give yourself more time than feels reasonable, especially if you’re doing it somewhere rural like Northland.

If you’re still deciding whether to buy an older property at all, our guide to buying a house in New Zealand covers LIM reports, builder’s reports and the wider buying process in more depth. If a lifestyle block is part of your plan, our guide to buying a lifestyle block in New Zealand covers what we learned running one properly, animals, water and all. We’ve also written honestly about what living in Northland is actually like, tradie availability included, and if you’re earlier in the process altogether, our full guide to moving to New Zealand is the place to start.

Your questions answered

How long does a full house renovation take in New Zealand? There’s no reliable average, because it depends entirely on scope and what the house reveals once you start. Ours ran to two years from an original two-month plan. Build in significant contingency time, particularly for an older house, and treat any builder’s initial timeline as a floor, not a ceiling.

Can I do renovation work myself to save money? Some of it, yes. Cosmetic work, most exempt Schedule 1 jobs, and general labouring alongside a tradesperson are all reasonable DIY territory. Anything classed as restricted building work, structural changes, weathertightness, and all electrical and gas work, legally has to be done or supervised by a licensed practitioner, whatever your own skill level.

Do I need a resource consent as well as a building consent? Sometimes. Building consent covers the physical work meeting the Building Code; resource consent is a separate process under the Resource Management Act, needed if your project affects things like boundary setbacks, heritage listings, height limits or land use rules in your council’s district plan. Many straightforward renovations need only a building consent, but check with your council early if your property is heritage-listed, in a flood zone, or you’re adding significant floor area.

What should I ask for in a builder’s report before I buy an older house? A properly qualified inspector should check structure, roofing, cladding, subfloor, moisture readings throughout, and visible wiring and plumbing condition, not just give the house a general once-over. Ask for a written report you can share with a builder afterwards, not just a verbal summary, and don’t be afraid to ask for a second, more invasive inspection if the first one raises concerns.

Does insurance cover a house mid-renovation? Tell your insurer before major work starts, not after. Standard house insurance policies can exclude damage linked to renovation work, or require notification once structural or roofing work is underway, and cover can change again once the property is unoccupied for any length of time. Confirm your specific policy’s renovation conditions directly with your insurer.

Is it cheaper to renovate or to knock down and rebuild? It depends on the house and the extent of the damage found. As a rough rule, if the structure, foundations and roofline are sound and the issues are cosmetic, wiring or moisture-related, renovating is usually more cost-effective. If you’re looking at extensive foundation, structural or widespread weathertightness failure, get a comparative quote for a rebuild before committing, because very extensive old-house renovations can approach new-build costs per square metre.

Are renovation costs different in rural areas like Northland compared with Auckland or Wellington? Materials cost roughly the same wherever you are, since most are trucked in from the same suppliers. Labour costs can actually run a little lower per hour rurally than in Auckland or Wellington, but fewer tradespeople covering a bigger area usually means longer waits to get booked in, which can stretch your timeline even if it doesn’t stretch your bill.

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Renovating an old house teaches you more about New Zealand building, and about patience, than almost anything else we did in ten years here. If you’re weighing up a similar project, our full paid relocation guide goes deeper into the practical side of settling into a property here than we can fit into one article. Got a question about your own renovation plans, or want to compare notes on an old house you’re considering? Get in touch with us here; we’re always happy to help, or point you toward someone who genuinely can.

None of this is legal, financial or building advice. Consent requirements, exemptions and licensing rules change, so confirm your specific project with your local council’s building consent team and a licensed building practitioner before you st