The Index in One Paragraph
The NHPI tracks the selling prices that contractors agree on with buyers at the time a new-home contract is signed, with detailed house specifications held constant across consecutive periods. The series uses December 2016 as its base of 100, is not seasonally adjusted, and is not subject to revision — meaning April's reported declines are final in Statistics Canada's published time series.
Coverage is specific and worth pinning down. The index measures new single-detached, semi-detached, and row or garden townhomes across 27 census metropolitan areas, with indexes produced at the national and provincial levels. Condominium apartments are excluded because builders cannot cleanly separate land cost from structure cost when many condo units share a single lot. Prices are collected net of value-added taxes such as GST and HST, which means the NHPI isolates the builder's underlying price move rather than the inclusive figure a buyer sees at closing.
Why It Diverges from Resale
The methodological detail that drives the entire article is this: NHPI holds the house specification constant. Same square footage, same layout, same finish package, same lot type — month over month, the index strips out quality changes and reports a pure price signal. Resale data does no such thing. A resale price benchmark blends houses of varying age, size, and condition, and its month-over-month movement reflects both pricing and mix.
This is why the NHPR methodology page explicitly notes that the NHPI does not reflect price variation for resale houses. It is also why Statistics Canada lists the real estate industry as a key user of the series — the NHPI is built to be a comparator against MLS-based measures, not a substitute for them.
The NHPI is one of three components inside the Residential Property Price Index. The other two are the New Condominium Apartment Price Index and the Resale Residential Property Price Index. Treat NHPI as the builder-side signal in a three-leg stool — useful in isolation, more useful when read alongside its siblings.