Danish addresses, and the whole property behind them

Who builds on it

For teams that need the property, not just the address

Four jobs, and each one chains several registers — the joining is the part Grundfast does for you.

• Environmental consultants

  The desk study before an environmental or geotechnical site visit: construction year and roof material for asbestos screening, soil classification, protection lines and terrain.

  BBR→Jordforurening→Byggelinjer→DHM

• Investors and due-diligence teams

  From an address to the property, its buildings and parcels, the public valuation series and the company behind a tenant or seller.

  DAR→BBR→Matriklen→Ejendomsvurdering→CVR

• Proptech and property platforms

  Address autocomplete in the form, the property behind it in the product — with batch lookups for portfolios and signed webhooks when records change.

  DAR→BBR→Ejendomsvurdering

• AI agents

  The same registers as read-only MCP tools on the same key, so an assistant can answer “what stands on this plot?” without a bespoke integration.

  MCP

Coverage

13 registers, one key

All thirteen are in production, nationwide. Each is a documented REST endpoint and an MCP tool, and two derived layers sit on top.

• Buildings and units

  BBR

  Use, year built and rebuilt, floor areas, wall and roof material, heating — every code resolved to text.

  /v1/bbr/ejendom/:bfe

• Cadastral parcels

  Matriklen

  Parcel numbers, ejerlav and parcel geometry per property, reprojected to WGS84.

  /v1/matrikel/ejendom/:bfe

• Public valuation

  Ejendomsvurdering

  Property and land value with the full yearly series, as the tax authority assessed it.

  /v1/vurdering/:bfe

• Addresses

  DAR

  Autocomplete, lookup by UUID, address washing and reverse geocoding.

  /v1/adresse/search

• Companies

  CVR

  Name, status, legal form, industry and address by CVR number.

  /v1/cvr/:cvr

• Administrative areas

  DAGI

  Municipality, region, parish, court and police district for any point.

  /v1/dagi/:tema/:kode

• Elevation

  DHM

  Terrain height at any coordinate, and the measured height of each building.

  /v1/dhm/punkt

• Place names

  Stednavne

  Official place names around a point, nearest first.

  /v1/stednavne/punkt

• Soil classification

  Jordforurening

  Whether a point lies in an area where soil must be analysed before it is moved (§ 50 a).

  /v1/jord/omraadeklassificering

• Forest building line

  Naturbeskyttelse

  The 300 m forest line (§ 17) at a point, including where it has been lifted.

  /v1/natur/skovbyggelinje

• Protection lines

  Byggelinjer

  Ten coastal, lake, river, monument, church, dike and § 3 lines, each with a signed distance to its edge.

  /v1/natur/byggelinjer

• Zoning and local plans

  Plandata

  Zone, local plans, sub-areas and municipal plan frames at a point — with status, plan PDF and plot ratio; per property an indicative remaining floor area.

  /v1/plan

• Road and rail noise

  Noise

  Road, rail, airport and industry noise bands (Lden, Lnight) at a point from the national noise mapping, with the mapping year.

  /v1/miljoe/stoej

• Building footprints

  Layer · GeoDanmark

  The polygon of every building on a property, joined to its BBR record.

  /v1/geodanmark/bygninger/:bfe

• Aerial imagery

  Layer · Ortofoto

  XYZ map tiles by flight year, with a retina variant for the same ground.

  /v1/orto/tile/:z/:x/:y

• Every endpoint, parameter and field

  The OpenAPI 3.1 reference, in English — including the batch, GeoJSON, history and export variants of the endpoints above.

Integrate

The card above, from your own code

The same property, BFE 6033800, read from three registers with one key. The typed SDK retries transient failures for you.

import { GrundfastClient } from '@grundfast/sdk';

const gf = new GrundfastClient({ apiKey: process.env.GRUNDFAST_API_KEY });
const bfe = 6033800; // Nyhavn 20, Copenhagen

const [property, parcels, valuation] = await Promise.all([
  gf.ejendom(bfe),
  gf.matrikel(bfe),
  gf.vurdering(bfe),
]);

property.antal_bygninger;              // 3
parcels.jordstykker[0]?.areal_m2;      // 759
valuation.seneste?.ejendomsvaerdi_kr;  // 50000000

Moving from another source

Moving off a retired API

Pricing

Metered per call, free to start

Prices in DKK a month, excluding VAT. Pay yearly and save 20%.

Plans, annual prices and the Enterprise contract: see pricing.

FAQ

Questions international teams ask