In New Zealand, joiners and builders are distinct trades, and when it comes to structural building work, the law draws a fairly clear line. The short answer is: most structural work must be carried out or supervised by a Licensed Building Practitioner (LBP), and while some joiners hold an LBP licence, many do not — so it pays to check before you hire.
What Does a Joiner Actually Do?
A joiner is a skilled tradesperson who crafts and installs timber components — think kitchen cabinetry, doors, windows, staircases, built-in wardrobes, and furniture. Their work is typically non-structural, meaning it doesn't form part of the load-bearing framework of a building. Joiners work to fine tolerances and are experts in timber jointing, finishing, and fitting.
Joiners may work in a workshop (bench joiners) or on-site (site joiners/shop fitters), and their craft is closely related to carpentry — but the two are not the same thing.
What Counts as Structural Work in NZ?
Structural building work refers to work that affects the structural integrity of a building — framing, load-bearing walls, beams, foundations, roof structures, and similar elements. In New Zealand, this type of work is governed by the NZ Building Code and standards such as NZS 3604:2011 (Timber-framed buildings).
Under the Building Act 2004, certain building work is classified as Restricted Building Work (RBW). RBW must be carried out or supervised by a Licensed Building Practitioner holding the relevant licence class. Structural carpentry and framing fall squarely into this category.
You can read more about what qualifies as restricted building work at MBIE Building Performance.
The LBP Licence: The Key Distinction
The Licensed Building Practitioners (LBP) scheme is the legal framework that determines who can carry out or supervise restricted building work in New Zealand. There are several licence classes, including:
- Carpentry – covers structural framing, roofing, and related work
- Site – covers overall site supervision of residential building work
- Design – covers design of buildings
A joiner who also holds an LBP Carpentry licence can legally carry out structural carpentry work. However, many joiners are not LBP-licensed, because their trade focuses on non-structural fit-out rather than structural framing.
Always check whether your tradesperson holds the appropriate LBP licence class for the work involved. You can verify this on the Licensed Building Practitioners register.
Where the Lines Can Blur
Some joinery work sits in a grey area. For example:
- Installing a new door or window in an existing opening is generally non-structural and may not require an LBP.
- Cutting a new opening in a wall to install a window or door could be structural work, especially if it involves a load-bearing wall — this would require an LBP and likely a building consent.
- Staircase installation may be non-structural fit-out, or it may involve structural connections depending on the design.
- Replacing like-for-like joinery (e.g., swapping an old window for a new one of the same size) may fall under Schedule 1 exemptions of the Building Act, meaning no consent is required — but always confirm this with your local council before proceeding.
BRANZ is a useful resource for understanding building performance and construction standards in NZ.
Building Consent: When Is It Required?
If structural work is involved, a building consent is almost certainly required. Consents are issued by your local council, and the work must comply with the NZ Building Code. Carrying out structural work without the required consent is illegal and can cause serious problems when you come to sell your home or make an insurance claim.
If you're unsure whether your project needs a consent, contact your local council or visit MBIE Building Performance for guidance.
What a Joiner Can Typically Do Without an LBP
| Task | LBP Required? | Consent Likely? |
|---|---|---|
| Kitchen cabinetry installation | No | No |
| Built-in wardrobes | No | No |
| Door/window replacement (same size) | Usually no | Usually no (check council) |
| Staircase fit-out (non-structural) | No | Depends |
| New window/door opening in wall | Yes (Carpentry LBP) | Yes |
| Load-bearing beam installation | Yes | Yes |
When to Call a Professional
If your project involves any structural element — load-bearing walls, beams, foundations, roof framing, or new openings — you need a tradesperson with an LBP Carpentry or Site licence. A qualified builder with the right LBP class is typically the right person for this work.
For pure joinery fit-out — cabinetry, doors, windows, stairs, and timber finishing — a skilled joiner is exactly who you want. Many joiners are highly experienced and will be upfront about what falls outside their scope.
The safest approach is to ask any tradesperson directly: "Do you hold an LBP licence, and what class?" A reputable professional will answer clearly. You can find qualified local joiners and builders on tradedirectory.co.nz.
