In New Zealand, there is no specific law that automatically prevents a renderer from subcontracting work to another tradesperson — but whether they must tell you first depends heavily on what your contract says and your rights under consumer law. Understanding the rules before you sign anything can save you a lot of frustration down the track.
What the Law Actually Says
NZ law does not have a blanket rule requiring tradespeople to notify homeowners before subcontracting. However, the Consumer Guarantees Act 1993 (CGA) and the Fair Trading Act 1986 both apply to residential building and trade services. Under the CGA, any service must be carried out with reasonable care and skill, regardless of whether the work is done by the person you hired or a subcontractor they bring in. The renderer you contracted with remains responsible for the quality of the finished work — they cannot simply pass liability on to a subcontractor and wash their hands of it.
If the subcontractor does a poor job, your legal claim is still against the renderer you contracted with, not the subcontractor directly.
What Your Contract Should Say
The most important document here is your written contract. A well-drafted contract should clearly state:
- Whether the renderer is permitted to subcontract any or all of the work
- Whether they must notify you before doing so
- Whether you have the right to approve or decline a specific subcontractor
- Who is responsible if the subcontractor's work is defective
If your contract is silent on subcontracting, the renderer may legally subcontract without telling you. This is why it pays to ask the question before you sign and get any agreement in writing. If you want approval rights over who works on your home, make sure that clause is in the contract.
Consumer NZ has useful guidance on your rights when hiring tradespeople and what to look for in a service contract.
Does It Matter for Building Consent Work?
If your rendering project requires a building consent — for example, a new exterior plaster system on a new build or a significant re-clad — then the rules around who does the work become more important. Under the NZ Building Code, certain work must be carried out or supervised by a Licensed Building Practitioner (LBP).
Rendering that forms part of the weathertight envelope of a building (such as a direct-fixed plaster system) is considered restricted building work (RBW). This means it must be done by, or under the supervision of, a licensed tradesperson. If your renderer subcontracts to someone who is not an LBP when LBP status is required, that is a serious issue — not just a contractual one.
You can verify LBP status at any time through the Licensed Building Practitioners register. Always check that anyone working on your home's exterior cladding holds the appropriate licence class.
For guidance on what counts as restricted building work and when consent is needed, MBIE Building Performance is the authoritative source. Schedule 1 of the Building Act lists exemptions, but always confirm with your local council whether your specific project requires consent.
What About Quality and Materials?
When a subcontractor is brought in, there is sometimes a risk that the materials or systems used differ from what was originally specified. For example, if your contract specifies a particular render system — say, a product from Sika or Ardex — you have the right to expect that system is used, regardless of who applies it. Ask your renderer to confirm in writing that any subcontractor will follow the same specifications and manufacturer guidelines.
BRANZ provides technical guidance on exterior plaster and render systems that is worth familiarising yourself with if you want to have an informed conversation with your tradesperson.
Red Flags to Watch For
Be cautious if:
- A different crew turns up on the day with no prior notice or introduction
- The renderer is vague about who will actually do the work when you ask directly
- The subcontractor cannot show LBP credentials for restricted building work
- The subcontractor is using different products than those specified in your contract
- The renderer tries to redirect your complaints to the subcontractor rather than taking responsibility
When to Call a Professional
If you are unsure whether your rendering project requires an LBP, or if you want to ensure your contract properly protects your interests, it is worth getting advice before work begins. A qualified renderer who is transparent about their team and subcontracting arrangements is a good sign of a professional operation.
For disputes that have already arisen, Consumer NZ and the Disputes Tribunal can be useful avenues if you cannot resolve things directly with the renderer.
You can find qualified, reputable renderers in your area through tradedirectory.co.nz, where you can check reviews and ask about their subcontracting practices before committing.
Licensed Building Practitioner (LBP)
