Most homeowners haven't thought about consent before they start looking into a louvre roof or pergola.
But it's usually one of the first things that comes up once they do, and it can feel like an unexpected hurdle in what should be a straightforward project.
The good news is that it depends almost entirely on one thing – size.
When does a covered structure need consent?
Under the Building Code, louvre roofs and pergolas are treated similarly to porches and verandas, and the rules work on a sliding scale based on size:
- Up to 20m² – generally exempt from consent, and a design professional isn't required.
- 20m² to 30m² – still exempt, but only if the design has been carried out or reviewed by a Chartered Professional Engineer. This covers most kitset and prefabricated systems.
- Up to 30m² – also exempt where the work is carried out or supervised by a Licensed Building Practitioner, or designed by a Registered Architect.
- Over 30m² – a building consent is required.
These thresholds apply to permanent, roofed structures – which is what a louvre roof or polycarbonate pergola roof is, even though the term "pergola" can also describe an open, unroofed structure that's treated differently again. It's a genuinely easy distinction to get wrong, which is exactly why it's worth checking with a specialist rather than guessing from a product listing.
Council interpretation can vary in practice, so it's always worth a quick conversation with whichever council covers your address – whether that's Napier City Council, Hastings District Council, or further afield – before you commit to a size or layout.
The 20m²-30m² engineering catch
If a louvre roof or pergola falls between 20m² and 30m², the design needs to have been carried out by a Chartered Professional Engineer. Some DIY kitset products sold off the shelf haven't been engineered to this standard, which can become a problem later if you ever need to prove compliance – for insurance purposes, at resale, or if Council ever asks.
Worth asking any supplier upfront: has this design actually been signed off by a Chartered Professional Engineer, or is that assumed? It's a fair question, and a reputable installer – Louvre Roof Specialists included – should be able to answer it without hesitation.
If your project does need a consent
For louvre roofs and pergolas over 30m², a building consent is required. This is where the process gets more involved – you'll need a PS1 producer statement, elevations, and plans specific to your structure, all submitted to your local council. A good installer will handle this on your behalf rather than leaving you to piece it together yourself; it's one of the things worth confirming before you commit to anyone. Louvre Roof Specialists, for example, builds this into how a project is delivered – preparing the PS1, elevations, and plans as standard.
Boundary setback considerations
Size and engineering aren't the only consideration. Boundary setbacks matter too – how close your structure can sit to a neighbouring property line is set by your local council's district plan, not the Building Code. It's worth a call to your council's town planning team to confirm the required setback for your site before you finalise a design, particularly on smaller Hawke's Bay sections where space against the boundary is often tight.
What if plans change partway through
Sometimes a project that started out under the consent threshold grows during the design process – a bigger span, an added section, a change in layout. If a change like that pushes your project into consent territory, that's something you'll want your installer to flag early rather than discover partway through a build. It's a reasonable thing to ask about upfront: how do they handle a design that grows past the threshold, and will you be kept in the loop?
The checklist
Before you commit to a size, make sure you know:
- Whether your project falls under, within, or over the 20m²-30m² consent thresholds
- Whether your project will need a PS1, elevations, and plans for a full consent application
- Your required boundary setback, confirmed with your council's planning team
None of this needs to be a deterrent. Most residential louvre roof and pergola projects across Hawke's Bay and the wider North Island are straightforward once you know where they fit.
If you'd like a second opinion on where your project fits, Louvre Roof Specialists offers free, no-obligation advice on exactly what's required under the Building Code for your design. Steve brings 30+ years of building and installation experience and can talk you through it either way – call him on 021 288 7700 or book a free measure and quote here.
