# NL Building Cost Index Monitor (CBS) (`codeclouds/nl-bouwkosten-index-monitor`) Actor

Track Dutch (CBS) building/construction cost index for new-build housing -- bouwkostenindex, price-index monitor -- with YoY/MoM trend, threshold alerts, record highs/lows. Resolves CBS's cryptic OData codes into labeled monthly records, filtering out mixed-in yearly rows. From $0.003/record, PPE.

- **URL**: https://apify.com/codeclouds/nl-bouwkosten-index-monitor.md
- **Developed by:** [Dennis](https://apify.com/codeclouds) (community)
- **Categories:** Other, Real estate
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $3.00 / 1,000 index-records

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).

# README

## NL Building Cost Index Monitor (CBS) 🏗️

Official CBS (Statistics Netherlands) input price index for new-build housing construction costs — straight from CBS StatLine table `85728NED` (base year 2021=100). No login, no API key, no scraping: this is a direct government OData feed.

### Why this actor?

Every month, CBS publishes how construction costs for new-build homes are developing, split into a combined total index and its two underlying components (labour, materials). It's public, free, and goes back to 2018 — but it's only exposed as a raw OData API with cryptic component codes (`T001363`, `A043942`, `A043943`) instead of readable labels, and a dimension that mixes monthly rows with yearly summary rows without any obvious marker.

This actor does that translation for you:

- 📈 **Monthly building-cost index**, total plus labour/material breakdown, going back to 2018MM01
- 🏷️ **Human-readable labels**, not CBS dimension codes — resolves component names live from CBS itself
- 📊 **Year-on-year change included for free** — CBS publishes this directly, no extra charge
- ➕ **Optional month-on-month trend** — calculated purely from the fetched range, no extra data source
- 🎯 **Zero configuration** — leave the input empty and get the latest available month for the combined total index
- 🚫 **No personal data** — this is a macro-economic price index, not data about individuals or companies

### When should an AI agent use this?

- "What's the current CBS building cost index for new-build homes in the Netherlands?"
- "How much have construction labour costs risen year-on-year?"
- "Track the trend in material vs. labour cost components over the last 2 years."
- "Is Dutch construction cost inflation accelerating or slowing down month-to-month?"

### What this Actor does

- Fetches the building cost index from CBS StatLine table `85728NED` via its OData API
- Resolves component codes and month labels to readable text
- Lets you pick a component (total, labour, material, or all three) and a month range
- Optionally adds a month-on-month trend field, calculated from the fetched range

### What this Actor does NOT do

- **No per-material breakdown** (e.g. steel, timber, concrete separately) — CBS `85728NED` only splits into labour vs. material, not individual material types.
- **No groothandelsprijzen** (wholesale trade prices from suppliers like Raab Karcher/Stiho) — those sit behind a mandatory customer login and are out of scope for this actor.
- Not a replacement for project-level cost estimation software — this is a macro index, useful for contract indexing and trend-tracking, not for pricing an individual project.

### Input

| Field | Type | Description |
|---|---|---|
| `component` | string | `"totaal"` (default, combined index), `"loon"` (labour), `"materiaal"` (material), or `"alle"` (separate row per component). |
| `periodeVanaf` | string | Start month, format `"2025MM01"`. Leave empty together with `periodeTot` to use only the latest available month. |
| `periodeTot` | string | End month, format `"2025MM01"`. Leave empty to reuse `periodeVanaf` (a single month). |
| `maxResults` | integer | Cap on output records per run (default `500`, max `2000`). The full dataset since 2018 is only ~330 rows across all components. |
| `berekenMaandTrend` | boolean | Add a month-on-month change field, calculated from the already-fetched period range. Default `false`. |
| `alertDrempelPercentage` | integer | Signal when a record's absolute YoY or MoM change reaches/exceeds this percentage. Leave empty to disable. |
| `signaleerRecordpunten` | boolean | Flag, per component, whether a record is the highest/lowest index value within the fetched range. Default `false`. |
| `includeGww` | boolean | Also fetch CBS table 86049NED (infrastructure/GWW input price index, aggregate total). Only has data from 2020 onward. Default `false`. |

### Output

```json
{
  "periode": "2026MM05",
  "periodeLabel": "2026 mei",
  "component": "Bouwkosten totaal",
  "componentCode": "T001363",
  "indexwaarde": 129.2,
  "basisjaar": "2021=100",
  "yoyPercentage": 5.1,
  "momPercentage": 0.3,
  "momBeschikbaar": true,
  "drempelAlert": null,
  "isHoogstePunt": null,
  "isLaagstePunt": null,
  "bron": "CBS StatLine 85728NED"
}
```

`yoyPercentage` is always included (CBS publishes it directly). `momPercentage`/`momBeschikbaar` are only filled in with `berekenMaandTrend: true`, and `momBeschikbaar` stays `false` (not a guessed zero) whenever no previous month is available in the fetched range — e.g. the very first month of your range.

#### Threshold alerts (`alertDrempelPercentage`, optional, separately charged)

With `alertDrempelPercentage` set (e.g. `2`), `drempelAlert` becomes `true` whenever the absolute YoY or MoM
change (whichever is available) reaches or exceeds that percentage — `null` when the setting isn't used.
Only charged the extra `drempel-alert` event when the threshold is actually reached.

#### Record highs/lows (`signaleerRecordpunten`, optional, separately charged)

With `signaleerRecordpunten: true`, `isHoogstePunt`/`isLaagstePunt` flag whether a record is the highest/lowest
index value for its component within the fetched period range — `null` when the setting isn't used. Only
charged the extra `record-signaal` event when a record actually is a new high/low within the range.

#### GWW / infrastructure index (`includeGww`, optional, separately charged)

With `includeGww: true`, the actor also fetches CBS StatLine table 86049NED (aggregate GWW — grond-, weg- en
waterbouw / infrastructure — input price index, 2020=100), alongside the existing housing-construction index:

```json
{
  "recordType": "gww_index",
  "periode": "2026MM01",
  "periodeLabel": "2026 januari",
  "indexwaarde": 112.4,
  "basisjaar": "2020=100",
  "yoyPercentage": 3.2,
  "bron": "CBS StatLine 86049NED"
}
```

Only the aggregate GWW total is fetched (not the 25+ individual sub-sectors), to keep the same simple scope
and pricing as the existing housing index. Table 86049NED only has data from 2020 onward — a `periodeVanaf`
before that returns no GWW records for that part of the range (no error). Charged as the new `gww-index-record`
event, per record.

#### Run summary (last dataset item, free)

After all index records, the actor pushes one extra dataset item summarizing the run — same content as the `RUN_SUMMARY` key-value store entry, but also available via the normal dataset API/exports:

```json
{
  "recordType": "RUN_SUMMARY",
  "component": "totaal",
  "periodeVanaf": "2026MM01",
  "periodeTot": "2026MM05",
  "ruweRecords": 5,
  "outputRecords": 5,
  "momTrendSignalen": 4
}
```

Use `recordType === "RUN_SUMMARY"` to filter this item out of (or in for) your own processing. It is not charged.

#### Month-on-month trend (`berekenMaandTrend`, optional, separately charged)

With `berekenMaandTrend: true`, each record is compared against the same component's index value one month earlier, within the same fetched range. Only records where `momBeschikbaar: true` are charged the extra `mom-trend-record` event.

### Use cases

- **Calculation software / cost estimators** — pull a live, structured building cost index instead of manually checking CBS StatLine
- **Contract indexing** — many Dutch construction contracts reference this exact CBS index for price adjustment clauses
- **Construction consultants / cost analysts** — track labour vs. material cost trends separately
- **AI agents & MCP tools** — flat JSON, tiny input schema, resolved labels instead of CBS dimension codes

### Pricing

This Actor uses Apify's Pay-Per-Event (PPE) pricing model.

- **Actor Start:** $0.00005 (Apify default)
- **index-record:** $0.003 per output record
- **mom-trend-record:** $0.005 extra, only with `berekenMaandTrend` enabled and only when a previous month's value was actually found
- **drempel-alert:** $0.01 extra, only with `alertDrempelPercentage` set and only when a record actually
  reaches the threshold
- **record-signaal:** $0.006 extra, only with `signaleerRecordpunten` enabled and only when a record actually
  is a new high/low within the range
- **gww-index-record:** $0.004 per record, only with `includeGww` enabled

### Legal

- Source: **CBS StatLine** (`opendata.cbs.nl`), the official statistics office of the Dutch government. Table `85728NED` is open data, explicitly published for reuse.
- No authentication, no scraping — this is a direct, public OData API.
- Data is a macro-economic price index. No addresses, project names, company names, or personal data of any kind.

### FAQ

**Q: Why does the default run only return one month instead of the full 2018-present history?**
A: To keep the zero-configuration default fast and cheap. Set `periodeVanaf`/`periodeTot` to fetch a wider range — CBS has data back to `2018MM01`.

**Q: What does `component: "alle"` actually return?**
A: One row for each of the 3 index series (total, labour, material) instead of just the total. Note these are 3 *separate* index series, not a breakdown that sums to the total — "total" is its own weighted combination, not `loon + materiaal`.

**Q: How often is the data updated?**
A: CBS publishes this table monthly. A monthly scheduled run is sufficient.

**Q: Why is there no per-material (steel/timber/concrete) breakdown?**
A: CBS `85728NED` only publishes a labour/material split, not individual material types. No official CBS table currently offers that level of detail for this index.

***

*Zoekwoorden: bouwkosten index, inputprijsindex bouwkosten, cbs statline 85728ned, bouwkostenindex nieuwbouwwoningen, bouwkosten stijging, materiaalprijzen bouw, loonkosten bouwnijverheid.*

### Keywords

netherlands, construction, cbs, statline, open-data, government-data, price-index, mcp-tool

### Changelog

#### 0.2.0 - Threshold alerts, record highs/lows, GWW index

- New `alertDrempelPercentage` input: flags a record (`drempelAlert: true`) when its absolute YoY or MoM change reaches/exceeds the given percentage. Charged as `drempel-alert`, only when actually reached.
- New `signaleerRecordpunten` input: flags whether a record is the highest/lowest index value for its component within the fetched range (`isHoogstePunt`/`isLaagstePunt`). Charged as `record-signaal`, only on an actual new high/low.
- New `includeGww` input: also fetches CBS StatLine table 86049NED (aggregate GWW/infrastructure input price index, 2020=100). Charged as `gww-index-record`, per record.

#### 0.1.1 - Run summary in the dataset

- The batch run summary (component, period range, record counts, MoM-signal count) is now also pushed as the last dataset item, not just written to the key-value store — so it's visible via the normal dataset API/exports. Marked with `recordType: "RUN_SUMMARY"` to distinguish it from regular index records. No new charge; it only surfaces data already computed for free.

#### 0.1.0 - Initial release

- Fetch the CBS building cost index (table 85728NED) for new-build homes, filterable by component and month range.
- Live-resolved component labels instead of raw CBS codes.
- Year-on-year change included for free (from CBS); optional month-on-month trend as a paid add-on.

# Actor input Schema

## `component` (type: `string`):

'Total' combines labour and material costs into one index (default). 'All breakdowns' returns a separate row for total, labour, and material components.

## `periodeVanaf` (type: `string`):

Start month, format "2025MM01" (year + MM + month number 01-12). Leave empty together with 'Period to' to use only the latest available month.

## `periodeTot` (type: `string`):

End month, format "2025MM01". Leave empty to use the same value as 'Period from' (or the latest month if both are empty).

## `maxResults` (type: `integer`):

Caps how many output records this run produces (1-2,000). The full dataset since 2018 is only ~330 rows across all components, so this is mainly a safety cap.

## `berekenMaandTrend` (type: `boolean`):

Adds a month-on-month change field, calculated purely from the already-fetched period range (no extra data source). Only charged (mom-trend-record) when a previous month's value was actually found within the fetched range. Note: the year-on-year change field is always included for free, since CBS publishes it directly.

## `alertDrempelPercentage` (type: `integer`):

Signals when a record's absolute year-on-year or month-on-month change reaches or exceeds this percentage. New charged event drempel-alert ($0.01), only when the threshold is actually reached. Leave empty to disable.

## `signaleerRecordpunten` (type: `boolean`):

Flags, per component, whether a record is the highest or lowest index value within the fetched period range. New charged event record-signaal ($0.006), only when a record actually is a new high/low within the range.

## `includeGww` (type: `boolean`):

Also fetches CBS StatLine table 86049NED (Grond-, weg- en waterbouw / infrastructure input price index, aggregate total), alongside the existing housing-construction table. New charged event gww-index-record ($0.004) per record. Only has data from 2020 onward.

## Actor input object example

```json
{
  "component": "totaal",
  "maxResults": 500,
  "berekenMaandTrend": false,
  "signaleerRecordpunten": false,
  "includeGww": false
}
```

# Actor output Schema

## `results` (type: `string`):

Alle index-records in het default dataset.

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {};

// Run the Actor and wait for it to finish
const run = await client.actor("codeclouds/nl-bouwkosten-index-monitor").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = {}

# Run the Actor and wait for it to finish
run = client.actor("codeclouds/nl-bouwkosten-index-monitor").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{}' |
apify call codeclouds/nl-bouwkosten-index-monitor --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,codeclouds/nl-bouwkosten-index-monitor"
        }
    }
}

```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/McVWt13UNZL2cWQHx/builds/PdIik4AQ1Q9t552zD/openapi.json