Wellington rents stay stubbornly high while flat land stays stubbornly rare, which makes a buildable corner of an existing section enormously valuable, often the only realistic way to add a home in the suburb you already live in. The city's granny-flat story is mostly about people: adult children who can't afford to stay, parents building for them, downsizers banking the main house. The exemption removed the consent queue; Wellington's own gatekeepers never sat in it. Slope, access and Extra High wind decide what each section can do: engineering questions with per-address answers, and the reason the free feasibility check matters more here than anywhere.
Since January 2026, a stand-alone home of up to 70 m² no longer needs building consent anywhere in New Zealand, provided licensed professionals design and build it. The Building Code still applies in full, the council is notified through the exemption paperwork rather than a consent application, and your district plan keeps setting the ground rules for where and how it sits on the section.
The district plan's residential arithmetic applies as everywhere, but Wellington's real reads are physical: hillside provisions and retaining near boundaries, access on narrow streets, and wind zones where Extra High is the default assumption across the hill suburbs. Character-area mapping touches parts of the inner suburbs and is read for street-facing implications. Genuinely difficult sections get an honest no early; that's a feature of the process, not a failure.
Greywacke hills with pockets of flat: slope and retaining, not soil strength, drive the engineering. Gentle slopes carry roughly a 9% cost factor, steep or tricky sites around 18%. Crane positioning and materials access are planned, not improvised. Wind days stretch the window: 11 to 13 weeks on site is honest.
Gentle ones, yes (roughly a 9% cost factor covers the extra foundation and retaining work), and steep sites at around 18% where the geometry cooperates. Genuinely difficult sections get a straight no at the feasibility stage instead of an optimistic quote. Wellington has more of all three categories than any other city, which is why the address check comes first here.
Not for the engineering: sets are specified to Extra High as standard here, bracing and fixings signed for your actual address. Where the wind shows up is the calendar: crane and roof days need calm windows, which is why Wellington builds run 11 to 13 weeks rather than the national fast end.
Often yes, and it's checked before you commit: truck access, crane positioning and carry distance all get read in the feasibility pass, with any manual handling priced honestly. Some sites need a smaller crane or staged deliveries: cost, not feasibility. Impossible access earns an early, honest no.
Around $700 a week for a warm two-bed, more in the inner suburbs, with public-sector and hospital tenants keeping demand steady through every cycle. Against a turnkey build from the $130Ks–$190Ks, the arithmetic is the strongest in the country. The full story is on our Wellington page.
The free site check reads Wellington City Council's layers for your exact section: zones, overlays, services, wind.