Most residential rooftop solar in NZ no longer needs a building consent, but that doesn't mean there's nothing to sign off. Here's what actually still applies.
For most homes, no. Under an exemption to the Building Act 2004 in force since October 2025, a roof-mounted solar array under 40 square metres, on a building in a wind zone no higher than 'high', does not need a building consent. Larger arrays or higher wind zones are still exempt, but the design has to be signed off by a Chartered Professional Engineer. Either way, you still need an EWRB-registered electrician to certify the electrical work and your local lines company to approve the grid connection.
This question stops a lot of people before they even get to comparing quotes, and the honest answer is that the rules changed relatively recently and a lot of what's out there online is outdated. Here's what actually applies right now.
The short version: most standard residential rooftop solar installs don't need a building consent any more, but 'no building consent' doesn't mean 'no paperwork at all.'
Since October 2025, roof-mounted solar panel arrays are exempt from needing a building consent under Schedule 1 of the Building Act 2004, provided the array is under 40 square metres and the building sits in a wind zone no greater than 'high'.
Arrays that are larger than that, or on a building in a higher wind zone, can still avoid needing a full building consent, but the design has to be carried out or reviewed by a Chartered Professional Engineer (CPE) rather than left to the installer alone. This exemption was originally limited to existing residential buildings and has since been extended to cover non-residential buildings as well.
Not needing a building consent doesn't mean the install is unregulated. You still have to comply with the Building Code and your local District Plan, and there are two other approvals that apply regardless of the building consent exemption.
Ground-mounted solar arrays are treated differently to roof-mounted ones, and rural properties generally have more headroom than urban sections, so a ground-mount system is worth checking with your council specifically rather than assuming the same roof-mount exemption applies.
A building consent, or in some cases a separate resource consent, can also still come into play for a heritage-listed property, a special character zone, or if the panels would breach a height-to-boundary rule under your district plan. None of this is common for a standard suburban roof install, but it's exactly the kind of thing worth a quick check with your council before you commit, since the cost of finding out after the fact is much higher.
A properly credentialed solar installer should be able to tell you straight away whether your specific roof and array size falls inside the consent exemption, and should be the one arranging the Certificate of Compliance and the lines company approval as a standard part of the job, not something you have to chase up separately.
Our researched solar panel installer lists are checked against real business registration, SEANZ membership where applicable, and genuine local installation evidence, so every business on them already knows this process.
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Generally no. A roof-mounted array under 40 square metres, on a building in a wind zone no higher than 'high', is exempt from needing a building consent under the Building Act 2004. Larger arrays or higher wind zones can still be exempt, but need sign-off from a Chartered Professional Engineer.
Yes. Regardless of whether a building consent applies, the electrical work must be carried out or signed off by an EWRB-registered electrician, who issues a Certificate of Compliance confirming it meets the required electrical standards.
Yes, for a grid-tied system. Your local electricity lines company has to approve the connection before the system can be switched on and exporting to the grid, separately from any building consent question.
No, ground-mounted arrays are assessed differently, and requirements can vary by property type and council. Check with your council or a local installer before assuming the roof-mount exemption applies to a ground-mounted system.
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