Open data API

Name: Open data API Prefabricated House
Creator: prefabricatedhouse.de
License: https://www.prefabricatedhouse.de/data

We provide selected key figures around prefabricated house prices as a free, machine-readable JSON interface. The endpoints are read-only, CORS-open and usable without registration. All values relate to the year 2026.

Use is free of charge with source attribution and a link to www.prefabricatedhouse.de. Please cite "Prefabricated House" as the source and add a link to www.prefabricatedhouse.de. The data are guide values without warranty.

Endpoints

Price index 2020–2026

Development of the prefabricated house price per square metre (base 2020 = 100) with index value and €/m² per year. Guide values, as of 2026.

GET /api/daten/preisindex open

Example response

{
  "meta": {
    "quelle": "Prefabricated House",
    "quelleUrl": "https://www.prefabricatedhouse.de",
    "lizenz": "free of charge with source attribution and a link to www.prefabricatedhouse.de",
    "stand": "2026",
    "datensatz": "preisindex"
  },
  "basisjahr": 2020,
  "einheit": "€/m² (schlüsselfertig, Orientierungswert)",
  "verlauf": [
    { "jahr": "2020", "index": 100, "qmPreisEuro": 2140 },
    { "jahr": "2026", "index": 137, "qmPreisEuro": 2932 }
  ]
}

Portal statistics

Aggregated key figures of the portal: listed houses, provider pages and provider profiles. No personal data.

GET /api/daten/statistik open

Example response

{
  "meta": { "quelle": "Prefabricated House", "lizenz": "free of charge with source attribution and a link to www.prefabricatedhouse.de", "stand": "2026", "datensatz": "portal-statistik" },
  "statistik": {
    "haeuser": 181,
    "anbieterseiten": 500,
    "anbieterProfile": 46,
    "startJahr": 2026
  }
}

Construction costs by federal state

Guide values for the price per square metre (turnkey) per federal state as well as the number of active providers. As of 2026.

GET /api/daten/baukosten-bundeslaender open

Example response

{
  "meta": { "quelle": "Prefabricated House", "lizenz": "free of charge with source attribution and a link to www.prefabricatedhouse.de", "stand": "2026", "datensatz": "baukosten-bundeslaender" },
  "einheit": "€/m² (Orientierungswert schlüsselfertig)",
  "bundeslaender": [
    { "bundesland": "Bayern", "slug": "bayern", "qmPreisEuro": 2950, "aktiveAnbieter": 48 }
  ]
}

Base URL: https://www.prefabricatedhouse.de/api/daten. Responses contain a meta object with source, license and date. Under heavy use a rate limit applies (HTTP 429 with Retry-After).