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, EPA radon exposure data, each council's Record of Protected Structures and Architectural Conservation Areas, the NIAH built-heritage survey, national landslide-susceptibility and coastal-soil classifications, and the national public-transport timetable. 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.