Dutch Energy Label

Look up a Dutch building's energy label in EP-Online: class A to G, energy index, CO2 emissions, building details and validity.

nl-energy-label

Example

Input

{
  "postcode": "1012JS",
  "huisnummer": "1"
}

Answer

{
  "postcode": "1012JS",
  "huisnummer": 1,
  "valid_until": "2028-01-30T00:00:00",
  "energy_class": "A",
  "energy_index": 1.01,
  "building_class": "Utiliteitsbouw",
  "co2_emission_kg": 56.06,
  "construction_year": 1914,
  "registration_date": "2018-03-15T14:26:04.877",
  "bag_verblijfsobject_id": "0363010003761571",
  "energy_consumption_kwh": 970.95
}

Inputs

Field	Type	Required	What it is
`bag_id`	string	No	BAG verblijfsobject ID (alternative to postcode+huisnummer)
`postcode`	string	No	Dutch postcode (format 1234AB)
`huisnummer`	string	No	House number

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`energy_class`	string	Always (present in every successful answer)
`energy_index`	number	Always (present in every successful answer)
`building_class`	string	Always (present in every successful answer)
`co2_emission_kg`	number	Usually (present for most inputs)
`construction_year`	number	Always (present in every successful answer)
`energy_consumption_kwh`	number	Usually (present for most inputs)
`postcode`	—	Always (present in every successful answer)
`huisnummer`	—	Always (present in every successful answer)
`energy_index_emg`	—	Usually (present for most inputs)
`sbi_code`	—	Usually (present for most inputs)
`registration_date`	—	Always (present in every successful answer)
`assessment_date`	—	Usually (present for most inputs)
`valid_until`	—	Always (present in every successful answer)
`certificate_holder`	—	Usually (present for most inputs)
`calculation_method`	—	Usually (present for most inputs)
`is_simplified_label`	—	Always (present in every successful answer)
`based_on_reference_building`	—	Always (present in every successful answer)
`bag_verblijfsobject_id`	—	Always (present in every successful answer)
`total_results`	—	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "nl-energy-label",
    "inputs": {
      "postcode": "1012JS",
      "huisnummer": "1"
    },
    "max_price_cents": 5
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "nl-energy-label",
    "inputs": {
      "postcode": "1012JS",
      "huisnummer": "1"
    },
    "max_price_cents": 5
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "nl-energy-label",
  inputs: {
    "postcode": "1012JS",
    "huisnummer": "1"
  },
  max_price_cents: 5,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="nl-energy-label",
    inputs={
        "postcode": "1012JS",
        "huisnummer": "1",
    },
    max_price_cents=5,
))

Limitations

Requires EP-Online API key
A free API key from RVO is required. Register at https://apikey.ep-online.nl
Not all buildings have labels
Energy labels are mandatory for sale/rental but older buildings may not have one registered. Coverage is estimated at ~60-70% of Dutch housing stock.

Bundled checks that include it

Netherlands Property Check €0.19