How much does it cost to replumb a house in NZ in 2026?
Short answer
Replumbing a typical 3-bedroom NZ house in 2026 costs $12-25k for the plumbing alone, plus $4-10k of GIB and finishing repairs. Old galvanised iron or lead piping replacement is the most common reason — both fail and lead is now a known health risk. The plumber must issue a Certificate of Compliance. Council consent isn't usually required for a like-for-like replumb but it is for any layout change.
Source: Master Plumbers NZ. Updated May 2026.
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- Basic 3-bedroom replumb: $12-25k plumbing only
- Add $4-10k for plaster repair and painting
- PEX or copper are the standard modern materials
- Old galvanised iron has typical life of 50-70 years; lead is health-risk and should be replaced
- CoC required from the plumber
When a house needs replumbing
Galvanised iron pipes from pre-1970 builds — typical lifespan 50-70 years; many are at end-of-life now. Symptoms: brown water, low pressure, persistent leaks at joints.
Lead pipes from pre-1950 builds — health risk regardless of condition. Should be replaced as a priority.
Polybutylene pipes from 1980s-1990s installations — known to fail with hot water exposure. Some insurers won't cover homes with these.
PEX or copper installs from 2000+ are usually fine for decades.
The disruption
Walls and floors get opened. Living in the house during the work is possible but messy. Most homeowners book a holiday for the heaviest week. Total elapsed time 1-3 weeks depending on house size and complexity.
After plumber finishes: GIB repair, plastering, painting. That's a separate trade and usually takes another 1-2 weeks.
Knowing the rules is half the job. The other half is knowing who you're hiring. Check any NZ builder against the public record: company status, licensing and insolvency notices, from the official NZ sources.
Related questions
Sources: Master Plumbers NZ; PGDB pricing guidance 2026. General information for NZ homeowners, not legal advice. Building rules change and vary by council, so confirm critical details on the official source before acting. Last updated 2026-05.