A simpler pathway to a small dwelling still depends on getting the technical detail right. The word “exempt” should never be mistaken for an instruction to stop checking.
Building Performance has outlined changes to the granny-flat building-consent exemption taking effect on 8 October 2026. They address matters including certified composite structural products and connections to services. Product use must remain within the relevant certification and instructions, while service arrangements must meet the applicable conditions. The update does not make every small building or construction method automatically eligible.
Establish the pathway before the quote
For owners and builders, eligibility should be considered before a design or price is treated as settled. Assumptions made at that stage can affect the materials, people and work required.
A useful project brief records the proposed building, the intended construction system and how services will be provided. It should also identify the matters that still need confirmation rather than presenting them as solved.
That gives suppliers and trades a clearer basis for advice. It reduces the chance of a late discovery that a preferred product or connection arrangement does not fit the selected pathway.
Keep the evidence together
Certification documents are useful only when they relate to the actual product and its proposed use. Similar names or appearances are not enough to establish that two systems can be treated in the same way.
The same care applies when a design changes. A substitution that seems minor commercially may require another technical check.
Owners should also be clear about what information will be handed over at completion. A well-organised record of the build can support future maintenance and help explain how the dwelling was constructed.
The October changes may widen practical options, but the central discipline remains familiar: confirm the rules, design within them and retain the supporting information. A straightforward small-building project is usually the result of good preparation, not the absence of it.
