Steel frame kitset building consent rules changed in New Zealand on 23 October 2025, and if you’re planning a steel frame kitset build, that’s the first thing to get straight before you order. Here’s what actually applies now, and what still needs checking with your local council.
Quick answer: Small steel frame kitsets now have an easier path to being consent-exempt, because the boundary setback rule was relaxed on 23 October 2025, not because a size cap on consent itself changed:
- Under 10m²: no minimum setback required from a boundary or neighbouring residential building
- 10m² to 30m²: setback cut to 1 metre, down from a distance equal to the building’s height
- Over 30m²: no change, original setback rules and the standard consent process still apply
- Any size: plumbing, wiring and other Building Code and district plan rules still apply regardless of consent status
Steel Frame Kitset Building Consent: What changed on 23 October 2025
The government amended Schedule 1 of the Building Act 2004 to ease the setback rules for small detached single-storey buildings. Under the old rules, a standalone structure had to sit back from the boundary or any neighbouring residential building by a distance equal to its own height. That’s now been relaxed:
- Under 10m²: no minimum distance from a boundary or another residential building
- 10m² to 30m²: setback reduced to 1 metre from the boundary or a neighbouring residential building
Anything over 30m² keeps the original setback rules, and every structure, whatever its size, still has to meet the Building Code and your council’s district plan. The size threshold only changes whether you need a consent for the structure itself, not whether the build has to comply.
Where SFML’s kitset sizes land
For steel frame kitset building consent purposes, here’s roughly where SFML’s current kitset range sits against those thresholds, floor area only:
- Tiny House Steel Frame Kitset (3.0m x 8.0m, 24m²): falls in the 10 to 30m² band, so 1 metre setback, not the old height-based rule
- Accommodation Unit Steel Frame Kitset (3m x 10m, 30m²): sits right at the top of that band, get this one confirmed with your council rather than assuming
- House Steel Frame Kitset (8.4m x 10.0m, 84m²): well over the exemption threshold, needs a full building consent regardless
One important caveat: the size exemption is about the structure, not what you do inside it. If you’re connecting power, water or wastewater, or planning to live in it, those elements typically still trigger their own consent requirements even when the building itself is under 30m². Always confirm the full picture with your council before you order, not after.
Before you order: a quick checklist
- Measure your actual boundary setbacks on site, not just the floor area of the kitset
- Check your council’s district plan for anything extra that applies to your zone, such as flood risk, heritage overlays or coastal hazard areas
- Ask your council directly whether your specific build qualifies for the exemption, don’t rely on floor area alone
- Confirm engineering and compliance documentation is supplied with the kitset, consent-exempt or not
We supply engineering and compliance documentation with every kitset regardless of whether your build ends up needing a consent, and our team can talk you through where your specific project sits before you order. Browse the current kitset range or get in touch to talk through your site.
Where this comes from
This explainer draws on the Ministry of Business, Innovation and Employment’s building performance guidance and the Building Act 2004 Schedule 1 amendment that took effect on 23 October 2025. This is general information, not a compliance ruling on your specific site. Always confirm with your local council before you order.
A few common questions
Does the exemption cover plumbing and wiring too? No. The Building Act exemption is about whether the structure itself needs a building consent. Plumbing, drainage and electrical work still have their own compliance requirements, regardless of the kitset’s floor area.
What if my section has boundaries on more than one side? Setback rules apply to each boundary separately, so a corner site or through-site section can have different distances to check on each side. That’s exactly the kind of detail worth confirming with your council before you settle on a kitset size or placement.
Does SFML handle the council paperwork? We supply the engineering and compliance documentation that goes with each kitset. The consent application itself, exempt or not, sits with you and your council, and steel frame kitset building consent questions specific to your site are best confirmed with them directly.
