Solar panel building consent in NZ: when a roof array is exempt, when an engineer is needed, and the electrical and grid approvals you still need.
Usually not. Since 23 October 2025, a roof-mounted solar array under 40 square metres in a wind zone no higher than high needs no building consent. Larger arrays or higher wind zones need a chartered professional engineer on the design. You still need compliant electrical work and, for grid-tied systems, lines company approval.
Whether you need solar panel building consent in NZ is a question that stops many people before they even compare quotes. The rules changed recently, and a lot of what is online is out of date.
The short version is that most standard rooftop installs no longer need a building consent, but that does not mean no paperwork.
The Ministry of Business, Innovation and Employment (MBIE) explains the change on its solar panel consent exemption page. Changes to Schedule 1 of the Building Act took effect on 23 October 2025, adding exemptions for roof-mounted arrays on residential and commercial buildings.
In summary, an array under 40 square metres in a wind zone no greater than high is exempt. Larger arrays, or those in a higher wind zone, can also be exempt if a Chartered Professional Engineer carries out or reviews the design. The Order is published on legislation.govt.nz as the Building (Exempt Roof-mounted Solar Panel Arrays and Building Work) Order 2025.
An exemption removes the building consent requirement only. You must still comply with the Building Code, the local district plan and the conditions of the exemption. Fixings through the roof must stay weathertight, and the structure must carry the extra load.
Ground-mounted arrays are treated differently from roof-mounted ones and have their own exemption conditions in the MBIE guidance, so check with your council rather than assuming the roof rule applies. Heritage buildings, special character zones and panels that breach height-to-boundary rules can also trigger resource consent.
Roof solar can count as part of your roof cladding for planning purposes. None of this is common on a standard suburban roof, but a quick check with the council is far cheaper than discovering a problem after installation.
Ask the installer to state in writing whether your roof and array size fall inside the exemption, who arranges the Certificate of Compliance and the lines company approval, and what the structural fixing design is. If the array is large or the wind zone is high, ask who the engineer is.
Check what happens if the council or lines company asks for changes, and who pays. Also ask which standards the system is installed to and what warranty covers the panels, inverter and workmanship separately.
A credentialed installer can tell you straight away whether your roof falls under the exemption, and arranges the Certificate of Compliance and lines company approval as part of the job. If an installer is vague about the paperwork, that is a reason to keep looking.
TopChoice checks each listed business against the Companies Office and NZBN register, Google Business Profile evidence, relevant trade or industry membership such as SEANZ where applicable, and reviews, and excludes lead-generation sites and unverified operators. Our Top 5 Solar Panel Installers pages are a good place to start a shortlist.
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Generally no. A roof-mounted array under 40 square metres in a wind zone no higher than high is exempt under the Building Act 2004. Larger arrays or higher wind zones can still be exempt if a Chartered Professional Engineer carries out or reviews the design.
Yes. The electrical work must be carried out or signed off by a registered electrician, who issues a Certificate of Compliance confirming it meets the required standards.
Yes, for a grid-tied system. Your local lines company has to approve the connection before the system is switched on, separately from any building consent question.
No. Ground-mounted arrays have separate exemption conditions, and requirements can vary by property and council. Check with your council or installer before assuming the roof rule applies.
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