Get the official selling price (koopsom) for any Dutch property address directly from the Kadaster registry.
Search any address with postal code and house number to receive verified Dutch land registry sales records.
One-time payment per address lookup • 100% Automatic Refund Guarantee if no transaction found in Kadaster.
Direct registry lookup connected to the official deed of transfer.
If no deed of transfer is recorded in Kadaster for this address, a full refund is automatically issued to your payment method.
The koopsom is the official transaction price recorded at the Dutch Kadaster when the property was transferred at the notary.
Knowing the historical transaction price gives buyers and sellers solid baseline leverage during negotiations and bidding.
If no official transaction record exists for that address in the Kadaster, an automated 100% refund is issued immediately.
Official prices are recorded upon notary title transfer (sleuteloverdracht), which is typically 2 to 3 months after a bid is accepted.