In New Zealand, the short answer is no — a carpenter cannot legally carry out plumbing or electrical work, even during a renovation where all the trades are working side by side. These are restricted trades under NZ law, meaning only licensed professionals are permitted to do them. Understanding where the boundaries lie can save you from costly mistakes, failed inspections, and serious safety risks.
Why Plumbing and Electrical Work Are Restricted
NZ law draws a clear line around work that poses significant risk to health, safety, and property. Two key pieces of legislation set these boundaries:
- Plumbing, Gasfitting, and Drainlaying Act 2006 — restricts sanitary plumbing, gasfitting, and drainlaying to practitioners registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB).
- Electricity Act 1992 — restricts electrical installation work to registered electricians or people working under their direct supervision, as overseen by the Electrical Workers Registration Board (EWRB).
Breaching these restrictions isn't just a technical offence — it can void your home insurance, create liability if something goes wrong, and put lives at risk.
What a Carpenter Is Qualified to Do
A qualified carpenter — especially a Licensed Building Practitioner (LBP) — brings a wide range of skills to a renovation. They can legally carry out:
- Structural framing, wall removal, and alterations
- Installing doors, windows, skirting, and architraves
- Decking, cladding, and roofing (within their LBP licence class)
- Kitchen and bathroom cabinetry and joinery fit-out
- Flooring installation
- General building work covered under the NZ Building Code
A good carpenter will work closely alongside plumbers and electricians, coordinating the sequencing of work — for example, framing walls before the plumber runs pipes and the electrician runs cables, then closing up the walls afterwards.
Where the Lines Get Blurry
Some tasks sit close to the boundary and can cause confusion on site:
Connecting appliances
A carpenter might install a dishwasher or washing machine into a cabinet, but connecting it to the water supply or waste is plumbing work. Similarly, plugging an appliance into a standard socket is fine for anyone, but hardwiring it is restricted electrical work.
Bathroom and kitchen renovations
These rooms involve all three trades working in close proximity. A carpenter can build the vanity unit and tile backer, but a registered plumber must connect the basin, toilet, and shower to the sanitary system. An electrician must install and connect any new circuits, lighting, or heated towel rails.
Replacing like-for-like fixtures
Some minor plumbing tasks — such as replacing a tap washer or a showerhead on an existing fitting — may be done by a homeowner on their own home. However, any work involving the sanitary drainage system, hot water system, or gas is restricted. When in doubt, check with the PGDB or a licensed plumber.
Building Consent and Restricted Work
Many renovation projects require a building consent from your local council. Work involving plumbing and electrical alterations almost always triggers consent requirements under the NZ Building Code. Even where a project might qualify as exempt work under Schedule 1 of the Building Act, the restriction on who can perform plumbing and electrical work still applies — always confirm with your council.
For licensed building work, an LBP must issue a Record of Work on completion. Restricted plumbing and electrical work similarly requires certification from the licensed tradesperson upon completion — confirm the exact documentation requirements with your council and the relevant licensing board.
What Homeowners Can Do Themselves
As a homeowner working on your own home, you have slightly more latitude than a tradesperson working for hire — but the rules are still strict:
- Electrical: You may do very minor work such as replacing a socket cover plate, but any work on wiring, switchboards, or new circuits must be done by a registered electrician. See EWRB for guidance.
- Plumbing: You may replace tap washers and similar minor maintenance, but sanitary plumbing, drainage, and gas work must be done by a licensed practitioner. See PGDB for what's permitted.
Safety note: Unlicensed electrical or plumbing work is dangerous. Faulty wiring causes house fires; incorrect plumbing can lead to flooding, contamination, or structural damage. Always use licensed tradespeople for restricted work.
When to Call a Professional
For any renovation involving changes to:
- Water supply, drainage, or waste pipes
- Hot water cylinders or gas appliances
- Electrical wiring, switchboards, or new circuits
- Heated floors, bathroom lighting, or rangehood ducting
…you need a licensed plumber and/or a registered electrician — not your carpenter, no matter how handy they are. A good carpenter will tell you this themselves and can often recommend trusted trades they work with regularly.
You can find qualified local carpenters, plumbers, and electricians on tradedirectory.co.nz to make sure your renovation is done legally and to a high standard.
Sources & Further Reading
- Plumbers, Gasfitters and Drainlayers Board — restricted work
- Electrical Workers Registration Board — licensing and restricted work
- Licensed Building Practitioners — find an LBP
- MBIE Building Performance — building consents and the NZ Building Code
- BRANZ — renovation guidance for NZ homes
- WorkSafe NZ — health and safety on construction sites
