Dutch Real Estate Intelligence

WONING
LAB

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Funda listings, BAG building data, and WOZ tax assessments — combined into one compound API. Updated daily across five Dutch cities.
—
Properties
5
Cities
32K+
WOZ Records
37K+
Price Events
01 — Data Sources
Four sources.
One API.
No single Dutch data source gives you the full picture. We combine them all — enriched daily — so you can find undervalued properties, calculate rental yields, and track market momentum in one call.
01

Funda Listings

Price, area, rooms, energy label, photos, broker, days on market. Every active listing across 5 major Dutch cities, refreshed daily.

70+ fields per listing
02

BAG Building Data

Official building registry via PDOK. Construction year, surface area, building purpose, buurt, wijk, and gemeente classification.

99% enrichment rate
03

WOZ Tax Assessments

Government property valuations going back 10+ years. Compare asking prices to assessed values. Spot overpriced and undervalued properties instantly.

10 years of history
04

Price Events

Historical asking prices, sold prices, price changes, and WOZ assessment changes over time. Full timeline of every property's financial history.

37,000+ events tracked
02 — API
Endpoints
Authenticate with a single API key. Query with standard REST. Get compound property records in JSON.
GET /v1/properties
Paginated property search with filters. city, offering_type, price_min, price_max, energy_label, buurt, postcode, sort, order, page, limit
GET /v1/properties/{id} Full compound record: listing + WOZ history (10 years) + all price events.
GET /v1/analytics/price-vs-woz
Find overpriced or underpriced properties by WOZ divergence. direction (overpriced/underpriced), city, limit
GET /v1/analytics/summary Dataset statistics: totals, averages, city breakdown, enrichment coverage.
Quick Start
# Search Amsterdam buy listings
curl -H "X-API-Key: YOUR_KEY" \
  https://api.woninglab.nl/v1/properties?city=amsterdam&offering_type=buy&limit=5

# Find most undervalued properties in Rotterdam
curl -H "X-API-Key: YOUR_KEY" \
  https://api.woninglab.nl/v1/analytics/price-vs-woz?direction=underpriced&city=rotterdam
03 — Coverage
What you get
per property
Updated daily. Every record is a compound join across all sources.
Funda Listing Price, area, rooms, energy label, photos, broker, days on market, description
BAG Enrichment Building year, buurt/wijk/gemeente, official surface area, building purpose
WOZ History Up to 10 years of tax assessment values per property
Price Events Asking prices, sold prices, WOZ changes over time
Coordinates Lat/lng for mapping, distance calculations, and geospatial queries
04 — Pricing
Transparent
pricing
No hidden fees. No enterprise sales calls. Pick a plan and start querying.
Starter
€99 /MO
  • 1,000 API calls/day
  • All properties
  • WOZ + BAG data
  • Email support
Get Started
Pro
€249 /MO
  • 10,000 API calls/day
  • All properties + analytics
  • Bulk export (CSV/JSON)
  • Priority support
Get Started
Enterprise
€499 /MO
  • Unlimited API calls
  • Raw database exports
  • Custom analytics
  • Dedicated support
Get Started

Prefer to pay via invoice or bank transfer? Contact us

05 — Free Alerts
Get weekly
investment alerts
Our algorithm scores every buy listing across 5 cities on WOZ divergence, energy upgrade potential, price drops, and more. Get the top opportunities in your inbox — free.
5
Scoring signals
—
Opportunities/week
Free
Weekly digest
Want daily alerts before everyone else? Upgrade to Pro — €9.99/mo
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