Where the figures come from

Where the correct reading of a rule is genuinely unsettled, the calculator declines to give a number rather than picking one. Two of those are live at the moment: which Consumer Price Index series and period the cap is measured against, and which direction a fraction of a cent rounds. Where the answer would turn on either, the page says so.

We do not carry listings from any property portal, and we do not fetch or reproduce their content.

The price pages are built from the Residential Property Price Register, published by the Property Services Regulatory Authority. It is a record of what was filed for stamp duty, not a list of asking prices, and it runs from 2010 to 2026. The whole register is read at import, 9 September 2026, and reduced to per area, per year summaries. Nothing about an individual sale is published.

Two of its columns decide whether a figure is right, and both are commonly ignored. Sales marked as not full market price were not at arm’s length, and sales marked VAT exclusive were recorded without the tax the buyer paid. Neither is counted in any median here. Both are shown, so you can see how many were set aside.

We do not gross the VAT exclusive prices back up. That would mean applying a tax rate, and there is no page we could find tying a rate specifically to the sale of a house, so there is no sentence to cite. Leaving them out needs no unverified figure.

The median is used rather than the mean, because one large sale moves a mean enough to make it useless at the scale of a town. A figure is printed only where at least 10 sales sat behind it, and the headline on every page comes from the most recent complete year rather than the year in progress.

The register has no town column. Place names are read out of the address: the county is stripped off and what remains at the end is the locality. Addresses ending in a street name are not counted towards anywhere. That produces 941 places and 140 Eircode areas. Eircode areas start in 2021, because the register carried an Eircode on well under one per cent of sales before then.

The last four characters of an Eircode are discarded at import. They identify a single letterbox, and keeping them would make this a record of who bought which house.

The Property Price Register is published by the Property Services Regulatory Authority under the Creative Commons Attribution 4.0 licence. That licence allows re-use, including commercially, on condition that the source is credited and that changes to the data are declared. The changes made here are: Summarised into per area, per year medians and quartiles. Sales not at arm's length and sales recorded without VAT are excluded from every figure. Place names are derived from the address field. The last four characters of each Eircode are discarded.

The Consumer Price Index is published by the Central Statistics Office under the Creative Commons Attribution 4.0 licence, on the same terms. It is used as published, with a single series taken from it.

Individual sales are published, with the address as filed and the Eircode where the register carries one, because that is exactly what the register itself publishes and what the licence permits republishing. They were trimmed to the street at first, on our own initiative rather than any rule, and that cost the one thing an aggregate can never give: which house. Where the same property has sold more than once since 2010, and 44,427 of them have, the other sales are shown beside it.

What is not published is anybody’s name. The register does not carry buyer or seller names and neither do we.

Nothing here is taken from any property portal. We do not fetch, parse or reproduce listings from Daft, Rent.ie, MyHome or anywhere similar, and there is no code in this site that could.