> ## Documentation Index
> Fetch the complete documentation index at: https://help.ratemyflat.co.nz/llms.txt
> Use this file to discover all available pages before exploring further.
# Where our data comes from
> The sources that power Healthy Homes Scores on ratemyflat.
ratemyflat combines official government data with first-hand accounts from the people who know each home best — the tenants who've lived in it.
## Primary data sources
Land Information New Zealand (LINZ) data anchors every home to a real legal address and land parcel — including specific apartment numbers within larger complexes.
The core of every Healthy Homes Score. Tenants rate heating, ventilation, insulation, draughts, moisture, day-to-day liveability, and the neighbourhood.
Owners and property managers can upload Healthy Homes compliance statements, insulation certificates, and third-party assessment reports as evidence of a home's condition.
## How the data is used
### Home identification
LINZ records keep the home database accurate. When you search an address, LINZ data ensures you're looking at the right physical location — not a near-match across town.
### Score generation
LINZ provides the "where". Tenants provide the "what". When multiple tenants report a home is damp or hard to heat, the score reflects that. When owners upload third-party assessments showing the opposite, that counts too.
### Evidence and trust
Tenants and owners can both upload documents that back up their claims. For example:
* A tenant might upload a bond receipt to verify they lived there.
* A property manager might upload an insulation certificate showing R-values that meet the legal minimum (2.9 for ceilings).
## Data privacy
Tenant anonymity is non-negotiable. Personal details from documents used for verification are reviewed internally and never made public.
Spotted an error in a home's basic details? See [Accuracy and corrections](/data/accuracy-and-corrections).