New Zealand's house price measures often contradict each other. Here's what mortgage advisers need to know about reading the data correctly
Every time housing data hits the news, the same question surfaces: how can two reports about the same market look so different?
As at May 2026, QV puts the national average home value at $912,190. The Real Estate Institute of New Zealand (REINZ), a private membership body representing more than 17,000 real estate professionals, puts the median sale price at $775,000. Both figures are accurate, yet they sit $137,190 apart.
That gap matters to mortgage advisers. Clients bring headlines into conversations. When one report says prices are flat and another says they have fallen, the adviser who can explain the difference builds trust and gives better guidance.
What medians and averages tell you about house price data
Medians and averages track sale prices — only the properties that traded in a given period.
REINZ reports the median sale price of properties that sold each month, while QV reports an estimated average value across the whole housing stock. Both are useful, but they are not the same number. This is why figures that look inconsistent can both be correct.
That distinction matters in a quiet market defined more by caution than urgency. When fewer homes trade, the composition of those sales can shift significantly from month to month. A run of expensive Auckland listings clearing can push a national average up. A patch of lower-priced regional sales can pull a national median down. Neither move reflects a genuine change in what your client's home is worth.
Asking prices add another layer of confusion. These are not realised sale prices – they reflect what vendors hope to receive. In a market with elevated listings, asking price data tells you more about vendor expectations than achieved outcomes.
When an index gives a clearer read
For tracking whether prices are truly rising or falling over time, a well-constructed index is more reliable than a median or average alone.
Te Tūāpapa Kura Kāinga – the Ministry of Housing and Urban Development (HUD) – offers one of the most comprehensive official data sets through its Property and Sales Statistics dashboard. The dashboard draws on the District Valuation Roll compiled by local councils, uses the agreement date when a deal is struck rather than the settlement date, and is updated regularly to reflect the latest completed sales.
HUD notes that Cotality and QV – both of which publish monthly statistics including a dollar value – are not reporting median sales prices. They are reporting an average property value for all properties, calculated through their respective house price indices.
That is a meaningful distinction. An index controls for the mix of properties changing hands, making it better suited to tracking underlying market direction over time.
As at May 2026, QV's House Price Index puts the average national residential property value at $912,190, down 0.17% over the past 12 months. That kind of index-based reading, anchored to the full housing stock rather than just what sold, is more stable and more useful for long-term conversations about market direction.
Why this matters for your clients right now
In the current market, getting the measure right is especially important. New Zealand's housing market has been broadly flat through 2026, with softer prices opening a window for first-home buyers. Different data providers telling slightly different versions of the same cautious story. Understanding which tool each report uses helps advisers give clients a cleaner read on house price data. More importantly, it cuts through the noise of conflicting headlines.
For clients considering buying or refinancing, the more useful question is not "which number is right?" It is: what does this data tell me about my position, my timeframe, and the type of property I am looking at?
That reframe – from house price data to client decision – is where advisers deliver value that no dashboard can replicate.
