iHouse Methodology
Below is how iHouse currently processes its data — how each number is computed, where it comes from, what windows are used, and what is intentionally out of scope. If you plan to cite a number from iHouse, this page is the place to look for 'why this number'.
Scope
iHouse is a research index over Ireland's public property records — the Property Price Register (PPR), publicly available residential listings, BER energy certificates, CSO Small Area demographics, Pobal HP Deprivation Index, OPW flood maps and EPA radon exposure data. It covers the Republic of Ireland; Northern Ireland uses a separate land registry and is not in scope.
iHouse does not produce automated valuations (AVMs), price forecasts, or buy/sell recommendations. The numbers shown are aggregates over historical records; they describe what happened, not what will happen.
Property identity
Each property on iHouse is uniquely identified by an internal identifier. Where an Eircode is available, this identifier is keyed off the Eircode — this is the most reliable identity Ireland's data sources offer at delivery-point resolution.
When source data lacks an Eircode (some older rural addresses, some PPR rows pre-dating the rollout), iHouse merges records using a combination of geocoded coordinates and normalised address text. Records that resolve to the same property after normalisation are folded into one canonical record; the underlying source rows are preserved internally for audit.