How Much Does It Cost to Replumb a House in NZ? (2026)
Typical cost in NZ
$18,000
A replumb a house in New Zealand typically costs around $18,000, ranging from $10,000 for a budget job to $55,000+ at the premium end. The figures below break down what each level gets you, what drives the price, and how it varies by region.
Replumb a House cost by level
Budget
$10,000 – $18,000
Small 2-3 bedroom house, like-for-like replumb, retain existing fittings, plumber-supplied GIB patching only.
Mid-range
$16,000 – $28,000
Standard 3-4 bedroom house, full replumb with new isolation valves, new TMV (tempering valve), some upgraded fittings.
Premium
$28,000 – $55,000
Large or two-storey, copper throughout, premium fittings, integrated with bathroom or kitchen renovation, full plaster repair and repaint.
What changes the price
| Factor | Impact | Why |
|---|---|---|
| Pipe material choice | PEX cheapest, copper +20-40% | PEX is fast to install; copper looks better and lasts indefinitely. |
| Access to existing pipework | +15-30% | Pipes buried in concrete slab or behind decorative wall finishes add labour. |
| Lead pipe presence (pre-1950) | +10-20% | Health-risk disposal, sometimes additional council requirements. |
| GIB damage repair | $3-8k separate | Plumber leaves holes; plasterer and painter follow. |
| Number of bathrooms / kitchens | Linear | More fixture points = more labour. |
Replumb a House cost by region
Indicative cost based on the typical figure, adjusted for regional labour and material differences.
Auckland
$20,000
Wellington
$19,000
Christchurch
$17,000
Hamilton
$17,000
Tauranga
$18,000
Regional NZ
$17,000
What's usually included — and what isn't
Usually included
- Replacement of internal supply piping
- Hot and cold supply to each existing fixture
- New isolation valves
- Connection to existing hot water cylinder
- Standard fixtures (kept or like-for-like)
- Certificate of Compliance
Usually extra
- New hot water cylinder
- Bathroom / kitchen renovation work
- GIB patching and finishing (separate trade)
- Painting after repair
- External drainage (drainlayer territory)
- Council Trade Waste consent if applicable
Typical timeline
5–21 days
Building consent
Not usually required
Like-for-like replumbing usually doesn't need building consent. Layout changes (moving a bathroom, adding a wet area) need consent. Plumber must issue a Certificate of Compliance for the work.
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Getting quotes without getting burned
Red flags in a quote
- Doesn't specify pipe material (PEX, copper, or polybutylene — avoid polybutylene)
- No mention of Certificate of Compliance
- Excludes isolation valves
- No plan for GIB repair
Questions to ask
- PEX or copper? PEX is fast; copper lasts longer.
- Will you replace all internal piping or only failing sections?
- How long are you on site? (Living arrangements during the work)
- Who patches the GIB after the pipe runs?
- Will you issue a CoC and a final test?
Find registered trades near you
Ready to get quotes? Browse registered replumb a house trades by city — then run a background check on each one before you sign.
Frequently asked questions
- How long does a replumb take?
- Typical 3-bedroom house: 1-3 weeks for the plumbing work itself, then 1-2 weeks for plaster repair and painting.
- Should I replace lead pipes in a pre-1950 house?
- Yes — lead is a health risk regardless of pipe condition. Most NZ pre-1950 houses with original plumbing have at least some lead components. Replacement is usually mandatory if you renovate.
- What's the cheapest way to do this?
- PEX throughout, like-for-like replacement, do your own GIB patching and painting after the plumber leaves. Saves $4-10k versus full turnkey including finishes.
Related cost guides
Sources: Master Plumbers NZ — masterplumbers.org.nz; PGDB pricing guidance 2026. Figures are 2026 estimates for guidance only and exclude GST unless stated — always get written quotes for your specific project. Last updated 2026-05.