Do You Need Building Consent for Solar Panels in New Zealand?

For most homes, no, you do not need building consent to put solar panels on your roof. As of 23 October 2025, the Government added a new exemption to Schedule 1 of the Building Act: a roof-mounted solar array of up to 40 square metres, fixed to a building in a wind zone up to and including High, can be installed without a building consent and, in most cases, without an engineer's sign-off. That covers the vast majority of residential systems in New Zealand, since a typical 6kW to 8kW array sits comfortably under 40 sqm. Go bigger than that, or live somewhere with serious wind, and the rules change. Here is exactly where the line sits and what it means for your install.

This matters because building consent is not a small thing. A consent application through your local council can add several hundred to a couple of thousand dollars in fees plus weeks of waiting, and it pulls an inspector into a job that, for a standard rooftop system, genuinely does not need one. The 2025 change recognised that reality. But "exempt from consent" is not the same as "do whatever you like," and the difference trips people up.

What actually changed on 23 October 2025

The change came through an update to Schedule 1 of the Building Act 2004, which lists the building work that does not require a consent. MBIE (the Ministry of Business, Innovation and Employment) administers the building regulatory system, and this was part of a wider push to cut red tape on low-risk work.

The new exemption covers roof-mounted solar panels and their mounting systems where:

• The total array is 40 square metres or less.
• The building sits in a wind zone of High or lower (we will explain wind zones below).
• The work is carried out by, or under the supervision of, a suitably competent person.

Meet all three and you can skip the consent process entirely. That is a genuine saving in both money and time, and it removes one of the more frustrating speed bumps that used to sit in front of a straightforward install.

The catch most people miss: exempt still means Code-compliant

Here is the part the headlines leave out, and it is the single most important thing on this page. An exemption from consent is not an exemption from the Building Code.

The work still has to comply with the Building Code in full. That means the panels and rails have to be fixed so they will not lift off in a storm, the roof penetrations have to be properly weathertight, and the structure underneath has to be able to carry the load. The only thing the exemption removes is the council's upfront paperwork and inspection. If the install is done badly, the legal responsibility for Code compliance still sits with the building owner and the installer. Skipping consent does not skip the standard.

In plain terms: the rules got easier, the quality bar did not move an inch. A dodgy install is still a dodgy install, and if it leaks or lifts, "but I didn't need consent" is no defence.

Understanding wind zones (this is where it gets local)

The 40 sqm figure is the easy part. The wind zone is where New Zealand geography starts to matter, and it is where a lot of homeowners get caught out.

Wind zones are defined under NZS 3604, the standard for timber-framed buildings, and they run from Low, through Medium, High, Very High, to Extra High and the specific-engineering category beyond that. The exemption stops at High. If your property sits in a Very High or Extra High wind zone, the consent exemption does not apply, even for a small array.

Most suburban and urban New Zealand homes fall in the Low to High range. But plenty of the country does not:

• Exposed Wellington and the south coast suburbs regularly sit in Very High zones. Wellington's wind is not a cliché; it is a regulatory category.
• Coastal and ridge-top sites almost anywhere, from the Wairarapa coast to exposed parts of Canterbury and Southland.
• Elevated rural properties with no shelter from surrounding terrain.

You cannot eyeball your wind zone reliably. It depends on your region, your site's exposure, and the terrain around you. A competent installer will determine it as part of the design, and your local council can confirm it. If you are even slightly unsure, get it confirmed in writing before the panels go up, because the wind zone decides whether you are inside the exemption or not.

When you do need an engineer (and what that costs)

Two situations push you outside the simple exemption and into needing a Chartered Professional Engineer (CPEng) to either design the fixings or review them:

• Arrays larger than 40 square metres. Think large rural sheds, lifestyle blocks, or homes going for a very large system to run an EV and a heat pump through winter.
• Very High wind zones and above. The forces on the panels and roof are high enough that the fixing design needs a professional behind it.

An engineer's involvement here is about the fixings and the structural load: making sure the rails are anchored to handle uplift, and that your roof framing can carry the array in the conditions your site sees. A CPEng review or design for a residential array typically runs in the order of several hundred dollars to over a thousand, depending on complexity and whether it is a desktop review or a full design. That is the trade-off for going big or living somewhere genuinely windy.

Importantly, needing an engineer is not the same as needing a building consent. In some cases the engineer's design satisfies the requirements without a full council consent, and in others the larger or more complex work tips you back into needing consent. A good installer will tell you which path your job sits on. If they cannot answer that question clearly, that is a yellow flag worth noting.

A genuinely useful trap to avoid: the array that creeps over 40 sqm

Here is something the sales conversation rarely surfaces. The 40 sqm limit is on the physical area of the array, not your system's kW rating, and panels have been getting physically larger as their output has climbed.

A modern panel is often around 1.9 to 2.0 square metres each. So 40 sqm works out to roughly 20 panels, give or take, depending on the exact model. At today's panel outputs of 440W to 460W and up, twenty panels is comfortably an 8.8kW to 9.2kW-plus system. For most homes that is more than enough.

But if you are being upsold into a very large system, or you are adding to an existing array later, you can quietly drift past 40 sqm of total roof-mounted panels without anyone flagging it. The exemption looks at the total array on the building. Two installs that each looked fine on their own can add up to something that needed an engineer. If you are expanding an existing system, count the lot, not just the new panels.

This is also a reason the physical panel you choose matters, not just the brand on the box. The differences between panel types are worth understanding before you sign, and we go through the technology properly over here: N-Type vs P-Type solar cells and which suits the NZ climate, plus what the warranty tiers actually mean in our breakdown of Tier-1 panels and your warranty.

What this means for a real install

Let us make it concrete with a few honest scenarios.

A 1970s brick-and-tile home in Hamilton

Sitting on the Waikato plains in a Medium wind zone, going for a 7kW system of around 16 panels (roughly 31 sqm). This is squarely inside the exemption: no consent, no engineer required. The installer designs the fixings to the Building Code as standard, the job goes ahead without council paperwork, and the homeowner saves the consent fee and the wait.

A two-storey weatherboard place in the Wellington hills

Same size system, but the site sits in a Very High wind zone because of its exposure. The exemption does not apply. The installer brings in a CPEng to design the fixings for the uplift forces. It still goes ahead, it just costs a bit more and takes a little longer to organise. The result is an array that will actually stay on the roof when a southerly comes through, which is exactly the point.

A lifestyle block near Ashburton with a big shed

The owner wants a 12kW-plus array across the house and shed to run irrigation, an EV, and the home. Total panel area comfortably tops 40 sqm. That pushes the job past the simple exemption, so an engineer is involved in the fixing design and the homeowner should confirm with Selwyn or Ashburton District Council whether a consent is also triggered for the scale of work.

The pattern is clear: standard home, standard size, sheltered-to-moderate site, you are fine. Big system, very windy site, or both, expect an engineer in the mix.

Where the exemption does not help you at all

Some situations sit outside this entirely, and it is worth being straight about them:

• Ground-mounted arrays. The 2025 exemption is for roof-mounted panels. A ground mount is a different beast structurally and may have its own consent requirements depending on size and your council.
• Heritage or character-protected buildings. If your home has a heritage listing or sits in a character zone, your district plan may impose rules that have nothing to do with the Building Act. Always check with your council.
• Body corporate and shared roofs. Apartments, units, and cross-lease properties bring consent from other owners into the picture, which is a separate hurdle from building consent.
• The electrical work. The exemption is about the building work, the panels and their fixings. The electrical side of any solar install must still be done by a licensed electrician and meet the relevant electrical safety rules. That part never went away.

What to ask your installer before you sign

Because the responsibility for Code compliance does not disappear with the consent requirement, the quality of your installer matters more than ever. Use these questions to separate the careful operators from the rest:

• "What wind zone is my property in, and how did you determine it?" A good installer will know or will check. A vague answer is a problem.
• "What is the total array area in square metres?" Make sure they have done the maths against the 40 sqm line, especially on a larger system.
• "How are the fixings designed to meet the Building Code for my roof and wind zone?" They should be able to explain how the array stays put and stays weathertight.
• "If we are over 40 sqm or in a Very High zone, who is doing the engineering?" You want a named CPEng involved, not a shrug.
• "What workmanship guarantee covers the roof penetrations?" Leaks show up months later. You want this in writing.

If you would rather start with installers who have already been checked over, we line homeowners up with three quotes from people we have vetted ourselves: get three free quotes here. And if you want to understand the full system before you talk to anyone, the rest of the hardware picture is laid out plainly in our guide to NZ solar hardware and tech.

Frequently Asked Questions

Do I need building consent for solar panels in New Zealand?

In most cases, no. Since 23 October 2025, a roof-mounted array of up to 40 square metres on a building in a wind zone up to and including High is exempt from building consent under Schedule 1 of the Building Act. The vast majority of residential systems fall well within those limits.

How big can my solar array be without consent?

Up to 40 square metres of roof-mounted panels. With modern panels at roughly 1.9 to 2.0 sqm each, that is around 20 panels, which at current outputs is comfortably an 8kW to 9kW system. That is more than enough for most homes.

What if my house is in a very windy area?

The exemption only applies up to and including a High wind zone. If your property sits in a Very High or Extra High wind zone, the exemption does not apply and you will need a Chartered Professional Engineer to design or review the fixings, even for a small array. Wind zones are set under NZS 3604; your installer or council can confirm yours.

Does being exempt from consent mean I can skip the Building Code?

No, and this is the most important point. The exemption removes the council's upfront paperwork and inspection only. The work must still fully comply with the Building Code for weathertightness, structural load, and fixing strength. The responsibility for that compliance still sits with the owner and the installer.

When do I need an engineer for my solar install?

Two triggers: an array larger than 40 square metres, or a property in a Very High wind zone or above. In either case a Chartered Professional Engineer should design or review the fixings to handle the structural load and wind uplift. A residential review or design typically runs from several hundred dollars up over a thousand, depending on complexity.

Does the exemption cover ground-mounted panels?

No. The 2025 Schedule 1 exemption applies to roof-mounted arrays. Ground-mounted systems are structurally different and may carry their own consent requirements depending on size and your council, so check before you build.

Do I still need a licensed electrician?

Yes, absolutely. The consent exemption covers the building work only, meaning the panels and their fixings. All electrical work in a solar install must still be carried out by a licensed electrician and meet the relevant electrical safety rules. That requirement has not changed.

What about heritage homes or apartments?

The building consent exemption does not override other rules. Heritage-listed or character-zone homes may face district plan restrictions, and apartments or cross-lease properties bring shared-ownership consents into play. Check with your local council and any body corporate before committing.

The bottom line

For the great majority of New Zealand homeowners, the 23 October 2025 change is genuinely good news: a standard rooftop system on a typical home no longer needs a building consent, which saves money and weeks of waiting. The two things to keep front of mind are the 40 square metre limit and your wind zone, plus the unchanging truth that the work still has to meet the Building Code regardless of paperwork.

So pick a careful installer, get your wind zone confirmed, and make sure the fixings and weathertightness are done properly. If you are still weighing up whether the whole thing pencils out for your roof, it is worth running your own numbers first; our solar cost and ROI calculator will give you a realistic picture before you commit to anything.

Where to Go From Here

If your home is a standard size on a sheltered-to-moderate site, the path is simple: line up a careful installer, get the wind zone confirmed in writing, and confirm the total array stays under 40 sqm. No council paperwork, no engineer, no waiting weeks for a consent to clear.

If you are eyeing a larger system, expanding an existing array, or you live somewhere genuinely exposed, the next step is to get a named CPEng involved early and ask your council whether the scale of work also triggers a consent. Sort that before the panels are ordered, not after.

Either way, the quality of the install is what protects your roof for the next twenty-five years. Get your three vetted quotes, ask the five questions above, and pick the operator who answers them clearly and in writing. From there, the rest of the decision comes down to the numbers on your own roof.