Greymouth is the Coast's service capital (health, trades, retail and mining payrolls in one river-mouth town), and its housing stock is older and colder than the people it houses deserve. That's the granny-flat case in Grey: sections are deep and cheap, the flood protection story is settled enough to read clearly, and a warm two-bed lists into a market with no modern competition. Family logic runs equally strong on the Coast. The exemption removed the consent step; Grey's reading is the river's mapped margins, rain-country detailing as standard, and spray grades along the sea edge.
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 town standards are conventional and generously met on Greymouth's platting. The Grey River's flood story (stopbanks and mapped margins) is read per address on the low-lying streets, and coastal edges carry spray and erosion considerations. Runanga, Cobden and the valley settlements add their own margin reads; rural blocks bring the standard services trio.
Rain detailing leads the spec (drainage, weather-tightness, claddings for the rainfall band), and river silts or coastal sands take the report's foundation answer. Freight over the passes is scheduled routine, and 11 to 13 weeks on site is the honest Coast window.
They mean the flood story is engineered and mapped rather than vague: the protected town reads differently from the mapped margins, and the feasibility pass sorts your address into its actual category before design. Low streets may take floor-level adjustments; plenty of the town builds conventionally.
Health staff at the Coast's main hospital, trades and mining rosters, and services workers: payrolls that hold through every cycle, renting against housing built for another century's winters. A warm two-bed has no real competitor in the local pool, and the section under it cost very little.
It's a solved problem the spec takes seriously: the Coast builds well in its climate when drainage and weather-tightness are designed rather than assumed, which is exactly what the signed set carries. Schedules plan wet days honestly (11 to 13 weeks on site), and the finished home shrugs at the sky.
Often ideally: the valley settlements hold deep sections and multi-generation land where a second dwelling keeps whānau close. The reads are margin mapping where the rivers run near, services on unserviced blocks, and access for the crew, all scoped in the feasibility pass.
The free site check reads Grey District Council's layers for your exact section: zones, overlays, services, wind.