Name: Property API
Brand: Voseno
Availability: PreOrder

Coming Soon

The Golden Address Record

Complete property context for any Dutch address, BAG identity, WOZ valuations, energy labels, and transaction history in a single API call.

One endpoint, complete property profile

Lookup by BAG ID, postcode+house number, or coordinates

WOZ tax valuations with multi-year history

Official energy labels from EP-Online (RVO)

Kadaster transaction history

GET /v1/properties/0363010012143321200 OK

{
  "bag_id": "0363010012143321",
  "address": {
    "street": "Prinsengracht",
    "house_number": "412",
    "postcode": "1016JB",
    "city": "Amsterdam",
    "municipality": "Amsterdam",
    "province": "Noord-Holland"
  },
  "coordinates": { "lat": 52.3676, "lon": 4.8832 },
  "building": {
    "construction_year": 1892,
    "surface_area": 98,
    "property_type": "apartment",
    "floors": 2,
    "monument_status": "none"
  },
  "ownership": {
    "type": "leasehold",
    "duration_category": "10+ years"
  },
  "transactions": [
    { "date": "2019-06-21", "price_bracket": "600k-700k" }
  ],
  "valuation": {
    "woz_value": 610000,
    "woz_reference_date": "2025-01-01",
    "woz_history": [
      { "reference_date": "2024-01-01", "value": 575000 },
      { "reference_date": "2023-01-01", "value": 530000 }
    ]
  },
  "energy": {
    "label": "C",
    "label_date": "2021-04-15",
    "assessment_method": "EP2"
  },
  "data_freshness": {
    "bag": "2026-03-10",
    "woz": "2025-01-01",
    "energy": "2021-04-15",
    "kadaster": "2019-07-03"
  }
}

API endpoints

Look up any Dutch address by BAG ID, postcode + house number, coordinates, or in batch.

GET/v1/properties/{bag_id}Look up by BAG identifier

GET/v1/properties/lookupLook up by postcode + house number

GET/v1/properties/reverseLook up by coordinates (lat, lon)

POST/v1/properties/batchBatch lookup (up to 100 BAG IDs)

Authoritative Dutch data sources

Every data point traces back to the official registry, no estimates, no scraped consumer data.

BAG

Addresses, building geometry, construction year, coordinates

Kadaster (BRK)

Ownership records and historical transaction prices

WOZ-Waardeloket

Municipal tax valuations with 5-year history

EP-Online (RVO)

Certified energy performance labels (EPC)

CBS

Neighbourhood-level demographics and livability scores

Everything in one call

BAG-anchored identity

Every property uniquely identified by its official BAG ID for permanent cross-system linkage.

WOZ history

Municipal tax valuations going back 5 years, updated annually after each new assessment.

Energy labels

Official EP-Online certified energy performance labels with the labelling date and assessor.

Transaction history

Historical sale prices from the Kadaster land registry for comparable analysis.

Be first to access it.

Property API is coming soon. Request a demo to see our roadmap and get early access.

PropertyAPI