Only the address (or a realestate.co.nz link) is needed. The listing is looked up on realestate.co.nz to fill in price, beds, baths, floor and land area, photo and the renovation / double-glazing scan; anything you type above wins over what it finds. Hazards and nearby places are looked up live. Decade built, construction and council valuation come from homes.co.nz, which only works when the page is opened through python3 serve.py, not on the published site. Added properties are saved in this browser only.
Hazards are point-in-polygon queries against Nelson City Council's published hazard services — river flood depth (present day and 2130), coastal flood depth, wave run-up, coastal erosion, liquefaction, slope instability tiers, and the fault deformation overlay. Depth bands and probabilities are the council's own wording.
Decade built and capital value come from council rating records via homes.co.nz. Beds, baths, floor and land area, price and description are as advertised on realestate.co.nz.
Wind zone and corrosion zone are from the BRANZ Map — the NZS 3604 wind zone (Low to Extra High, driving bracing requirements) and the coastal corrosion/sea-spray zone (Lowest, Moderate or Highest, affecting material durability near the sea). Indicative only; a site-specific assessment is higher resolution.
Distances are straight-line to OpenStreetMap points, not walking or driving time.
A property outside every hazard polygon is outside these polygons. It is not a clean geotech report, and it says nothing about overland flow, stormwater capacity, or what a specific site's ground actually does.
Listings are plotted to the street address, so a point can sit a few metres off. On a boundary, check the council viewer directly before drawing conclusions.
Coastal and 2130 river layers are climate projections under a stated scenario, not forecasts.
The Nelson / Wellington switch under the title swaps the listings, map and nearby places. Wellington covers Wellington City, Porirua and the Kāpiti Coast as far as Paraparaumu.
Wellington hazards come from four publishers: Greater Wellington Regional Council (regional liquefaction potential, earthquake-induced slope failure and tsunami evacuation zones) plus the district-plan overlays of Wellington City, Porirua and Kāpiti Coast (fault zones, flood hazard areas, coastal inundation and erosion). These are hazard areas, not modelled depths, and each council draws them differently, so compare within a council more confidently than across them. Tsunami zones are shown but not counted as a flag.
Hazard coverage for Nelson stops at the Nelson City Council boundary. Each council publishes its own hazard services, so a new region means pointing the same query at a new endpoint and mapping its layer names into the same severity scale.
For your Wellington lists that means Greater Wellington Regional Council plus the relevant city council; for Richmond and Best Island, Tasman District Council.