About Kadaster
The official record of who owns what ground in the Netherlands.
Kadaster is the Dutch national land registry and mapping agency, an autonomous government body under the Ministry of Housing and Spatial Planning. It has run the registers since 1832 from its head office in Apeldoorn and maintains the data that the rest of the country leans on for property, address, building and topographic information.
Practically, Kadaster operates several base registers that businesses pull from: BAG for addresses and buildings, BRK for cadastral parcels and ownership rights, BGT and BRT for topography, WOZ for valuation, and KLIC for underground cables and pipelines. Public datasets are exposed through PDOK and the BAG API, with restricted ownership data served through BRK Bevragen for authorised parties. Pulled into a warehouse next to your customer, contract and policy data, those base registers turn one-off lookups into a permanent operational view of the physical assets your business touches.