Sources

Every layer on the map, with its source, its licence and the year of its data. Each layer can be downloaded as its own file, under its source's licence.

Checked against sale prices

A typical home's value is its WOZ value, the official valuation of a home for tax, converted to the current price level. For each municipality it was compared with the average sale price of existing owner-occupied homes in 2025 (CBS, 83625NED). The WOZ value was 7% lower, because WOZ values trail sale prices and because rented homes count but rarely sell. The value was therefore raised by 8%. After that correction it is within 10% of the average sale price in 93% of municipalities, holding 96% of the homes (November 2026). For a single street the gap can be larger. The map therefore shows a margin of 10% either way instead of one amount.

OpenStreetMap

Layers marked ODbL contain data from OpenStreetMap, © OpenStreetMap contributors, available under the Open Database License. Those layers are published under the same licence. The file next to each layer is the derived database. A file is a gzip file with one byte per inhabited square, in grid order. Which squares are inhabited is in the mask, with one bit per square. The grid and the conversion of a byte into a value (scale and range) are in the index.

Base map: Kadaster, BRT Achtergrondkaart (CC BY 4.0), via PDOK, shown in greyscale.

Streets for Street View: Rijkswaterstaat, Nationaal Wegenbestand (CC0), via PDOK.

Typeface of the questions and the headings: Bricolage Grotesque, by The Bricolage Grotesque Project Authors (SIL Open Font License 1.1).

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