Overview Aotearoa Research Science

Housing — national pattern

National rollups for housing across all 16 regions. Pattern nodes here are projections over the regional graph; each pattern’s support is the union of its regional instances.

National pattern rollup — Housing

Housing

Patterns in housing observed across two or more regions of Aotearoa. Each pattern is a cross-regional generalisation grounded in region-specific evidence.

3 patterns.

Housing affordability deterioration across urban and peri-urban regions

Median house price-to-income multiples have risen to structurally unaffordable levels across New Zealand's urban regions, driven by supply constraints, low interest rates, and investor demand outpacing income growth.

Scale

Housing affordability has deteriorated in every urban and peri-urban region. Median multiples of 7–10× annual income are now common outside Auckland, compared with the international benchmark of 3× considered affordable.

Structural drivers

Supply-side constraints — restrictive zoning, infrastructure funding gaps, and planning delays — interact with demand-side factors including migration, investment, and historically low real interest rates to produce persistent affordability decline.

Manifests in
auckland, wellington, waikato, canterbury, northland, marlborough, nelson, tasman
Evidence
  • claim.auckland.housing.affordability_ratio_2023
  • claim.waikato.housing.median_multiple_8x
  • claim.canterbury.housing.affordability_ratio_2023
  • claim.marlborough.housing.affordability_1
  • claim.nelson.housing.affordability_claim

Infrastructure funding gap as primary supply constraint

Across regions, the binding constraint on new housing supply is not zoning alone but the cost and availability of three-waters and roading infrastructure, which smaller councils cannot fund at the scale required.

The infrastructure bottleneck

Councils with small ratepayer bases cannot front-fund the infrastructure necessary to open new residential land. Even where zoning permits growth, the absence of reticulated water, wastewater, and roads prevents development.

Policy implications

Central government co-investment in infrastructure — rather than solely planning reform — is therefore necessary to unlock supply in most non-Auckland regions. The RMA reform agenda addresses only one of two binding constraints.

Manifests in
northland, waikato, nelson, tasman, gisborne, west-coast, southland
Evidence
  • claim.northland.housing.affordability_claim1
  • claim.waikato.housing.median_multiple_8x
  • claim.nelson.housing.affordability_claim
  • claim.tasman.housing.affordability_claim
  • claim.west_coast.housing.affordability_claim

Māori housing deficit and overcrowding

Māori households experience significantly higher rates of overcrowding, housing unaffordability, and homelessness across all regions, reflecting structural dispossession and constrained papakāinga development.

Pattern

Māori over-representation in severe housing deprivation is consistent across regions. Overcrowding rates 3–5× the national average, compounded by barriers to building on Māori land and limited social housing supply in rural areas.

Structural basis

Colonial land alienation reduced the economic base of iwi and hapū, making intergenerational wealth accumulation through housing unavailable to most Māori. Contemporary papakāinga policy attempts partial redress but is constrained by finance, infrastructure, and planning rules.

Manifests in
northland, bay-of-plenty, gisborne, hawkes-bay, waikato, manawatu-whanganui
Evidence
  • claim.northland.housing.affordability_claim1
  • claim.waikato.housing.median_multiple_8x
  • claim.manawatu_whanganui.housing.housing_market_placeholder
  • claim.hawkes_bay.housing.cyclone_damage_extent

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