Whether you're adding a deck, replacing a window, or fitting out a new room, one of the first questions to ask is: does this job legally require a Licensed Building Practitioner (LBP)? The short answer is — it depends on whether the work is classified as Restricted Building Work (RBW) under the NZ Building Act. Understanding the difference can save you from costly compliance headaches down the track.
What Is an LBP and Why Does It Matter?
An LBP (Licensed Building Practitioner) is a tradesperson who has been assessed and licensed by the government to carry out or supervise certain types of building work. The licensing scheme is administered by MBIE, and you can verify any practitioner's licence at Licensed Building Practitioners.
Hiring an unlicensed person to do Restricted Building Work is illegal and can affect your insurance, your ability to sell your home, and your Code Compliance Certificate (CCC). It's not a technicality worth ignoring.
What Is Restricted Building Work?
Restricted Building Work (RBW) is building work that affects the structural integrity or weathertightness of a home (or other residential building). Under the Building Act 2004, this work must be carried out or directly supervised by a licensed person in the relevant licence class.
For carpentry specifically, RBW typically includes:
- Structural framing — walls, floors, and roof framing that form part of the primary structure
- Roof construction — including trusses, rafters, and associated framing
- External cladding — installation of weatherboards, fibre cement, or other cladding systems that keep water out
- External windows and doors — where their installation affects weathertightness
- Foundations and subfloor framing — piles, bearers, and joists that support the structure
If your carpentry job touches any of these elements and requires a building consent, an LBP must be involved. The MBIE Building Performance website has detailed guidance on what counts as RBW.
Work That Does NOT Require an LBP
Plenty of everyday carpentry work falls outside the RBW definition. A general carpenter (or even a competent DIYer) can legally carry out:
- Internal non-structural work such as skirting boards, architraves, and shelving
- Fitting internal doors (non-structural)
- Kitchen and bathroom cabinetry installation (where no structural or plumbing changes are involved)
- Replacing like-for-like interior linings (e.g. replacing damaged timber panelling)
- Building garden sheds or small structures that fall under Schedule 1 exemptions of the Building Act
- Decks under 1.5 m above ground that meet Schedule 1 criteria
Important: Schedule 1 exemptions can be nuanced and depend on the specific structure, site, and council. Always confirm with your local council before assuming work is exempt from consent — and therefore from LBP requirements.
Does the Job Need a Building Consent?
The simplest rule of thumb is:
| Situation | Consent Required? | LBP Required? |
|---|---|---|
| Structural framing, new rooms, extensions | Usually yes | Yes (if RBW) |
| Re-roofing (like-for-like materials) | Often no | Check with council |
| New deck over 1.5 m high | Usually yes | Yes |
| Small deck under 1.5 m (Schedule 1) | Often no | No |
| Internal fit-out, cabinetry, shelving | Usually no | No |
| External cladding replacement | Usually yes | Yes |
If a building consent is required and the work is RBW, you need an LBP. If no consent is needed (and the work is genuinely exempt), an LBP is not legally required — though hiring an experienced carpenter is still good practice.
BRANZ is a useful resource for understanding building standards and best practice in NZ construction.
How to Check Your Specific Job
- Contact your local council — they can tell you whether consent is needed and whether your planned work is RBW.
- Check the MBIE website — MBIE Building Performance has plain-English guidance on consent exemptions and RBW.
- Ask a qualified carpenter or builder — a good tradesperson will know immediately whether their licence is required for your job.
- Verify the LBP licence — before hiring, check the practitioner's licence class and status at Licensed Building Practitioners. The relevant class for most carpentry work is Carpentry.
What Happens If You Use an Unlicensed Person for RBW?
Using an unlicensed person for Restricted Building Work can result in:
- No Code Compliance Certificate being issued
- Difficulty selling your property (buyers' solicitors will spot it)
- Insurance claims being declined
- Personal liability if something goes wrong structurally
It's simply not worth the risk.
When to Call a Professional
If your job involves any structural framing, external cladding, roofing, or weathertightness elements — and especially if a building consent is required — you should hire a Licensed Building Practitioner with a Carpentry licence. Even for smaller jobs that don't legally require an LBP, a skilled carpenter brings expertise, the right tools, and accountability.
You can find qualified, local carpenters and LBPs on tradedirectory.co.nz. Always ask to see their LBP licence number and check it yourself before work begins.
