Dutch WOZ Property Values

Get average WOZ property values by Dutch municipality, with year-on-year trends, from CBS.

nl-woz-value

Example

Input

{
  "city": "Amsterdam"
}

Answer

{
  "trend": [
    {
      "year": 2023,
      "average_woz_eur": 516000
    }
  ],
  "currency": "EUR",
  "data_level": "municipality_average",
  "latest_year": 2023,
  "municipality": "amsterdam",
  "previous_year": 2022,
  "municipality_code": "GM0363",
  "average_woz_value_eur": 516000,
  "previous_woz_value_eur": 433000,
  "year_over_year_change_pct": 19.2
}

Inputs

Field	Type	Required	What it is
`city`	string	No	Dutch municipality name (e.g. 'Amsterdam')
`gm_code`	string	No	CBS municipality code (e.g. 'GM0363')

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`trend`	array	Always (present in every successful answer)
`latest_year`	number	Always (present in every successful answer)
`municipality`	string	Always (present in every successful answer)
`municipality_code`	string	Always (present in every successful answer)
`average_woz_value_eur`	number	Always (present in every successful answer)
`year_over_year_change_pct`	number	Usually (present for most inputs)
`previous_year`	—	Usually (present for most inputs)
`previous_woz_value_eur`	—	Usually (present for most inputs)
`currency`	—	Always (present in every successful answer)
`data_level`	—	Always (present in every successful answer)
`note`	—	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-woz-value",
    "inputs": {
      "city": "Amsterdam"
    },
    "max_price_cents": 3
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "nl-woz-value",
    "inputs": {
      "city": "Amsterdam"
    },
    "max_price_cents": 3
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "nl-woz-value",
  inputs: {
    "city": "Amsterdam"
  },
  max_price_cents: 3,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="nl-woz-value",
    inputs={
        "city": "Amsterdam",
    },
    max_price_cents=3,
))

Limitations

Municipality-level averages only
WOZ values are municipality-level averages from CBS, not individual property assessments. Individual property WOZ values are not available via public API.
Limited municipality lookup
City name lookup covers ~30 major Dutch municipalities. Use gm_code for smaller municipalities (CBS municipality codes).

Bundled checks that include it

Netherlands Property Check €0.19