One API. Every building.
Access trusted building intelligence through a single API. Energy labels, addresses, building characteristics, digital twins, sustainability data, media — hundreds of verified attributes from one unified platform.
Enterprise-ready · OAuth2 & API Keys · 99.99% uptime
JSON Response
{
"buildingId": "NL-BAG-0363...",
"energyLabel": "C",
"floorArea": 245.5
}Herengracht 123
1015BG Amsterdam
Label CDigital Twin
You asked:
Which buildings in Amsterdam are suitable for hybrid heat pumps?
Found 847 buildings matching criteria →
Trusted by teams in
Why NXTBLDNG
Building intelligence, unified.
Global building intelligence
Access building data across markets through a single, unified API endpoint.
One unified model
A single buildingId links addresses, energy, geometry, and sustainability data.
AI-ready
Structured JSON responses designed for LLM integration and agent workflows.
Enterprise security
OAuth2, API keys, SOC 2, and ISO 27001 compliance built in from day one.
High availability
Sub-150ms response times with 99.99% uptime SLA for production workloads.
Continuously updated
Data flows from official sources through validation to live API endpoints.
250+
Building attributes
40+
Official datasets
99.99%
Availability
APIs
Everything about a building, one platform.
Address
Standardized addresses with geocoding and validation.
{ "street": "Herengracht", "city": "Amsterdam" }Building
Core building characteristics and registry data.
{ "constructionYear": 1892, "usageType": "office" }Energy
Energy labels, consumption, and efficiency metrics.
{ "label": "C", "validUntil": "2032-01-15" }Digital Twin
3D models, floor plans, and spatial data.
{ "modelUrl": "...", "floors": 4 }Files & Media
Documents, photos, and certificates linked to buildings.
{ "type": "energy_certificate", "url": "..." }Climate
Climate risk, flood zones, and environmental data.
{ "floodRisk": "low", "heatStress": "medium" }Geometry
Footprints, heights, volumes, and spatial boundaries.
{ "footprint": [...], "height": 18.5 }Portfolio
Bulk operations and portfolio-level analytics.
{ "portfolioId": "...", "count": 1247 }Market Intelligence
Valuations, transactions, and market trends.
{ "estimatedValue": 2450000, "currency": "EUR" }Search
Full-text and geospatial building search.
{ "query": "Amsterdam office", "total": 847 }Use cases
Built for the industries that depend on building data.
Screen acquisition targets by energy label, floor area, and location in seconds.
Assess collateral value with verified building data and market intelligence.
€2,450,000
Power building-aware agents with structured, validated data for any query.
AI Response
847 buildings in Amsterdam match hybrid heat pump criteria. Top 3 by ROI...
Underwrite policies with climate risk, flood zones, and building characteristics.
Low
Monitor building stock compliance with energy regulations at scale.
Embed building intelligence into your platform with a single API integration.
This simple.
One request. Structured building intelligence. No complexity.
curl -X GET "https://api.nxtbldng.com/v2/buildings/{buildingId}" \
-H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
-H "Accept: application/json"{
"buildingId": "NL-BAG-0363010012345678",
"address": {
"street": "Herengracht",
"houseNumber": "123",
"postalCode": "1015BG",
"city": "Amsterdam"
},
"energyLabel": {
"label": "C",
"validUntil": "2032-01-15",
"source": "RVO"
},
"characteristics": {
"constructionYear": 1892,
"floorArea": 245.5,
"usageType": "office"
},
"coordinates": {
"lat": 52.3676,
"lng": 4.9041
}
}Interactive
Explore the API
{ "buildingId": "NL-BAG-0363...", "energyLabel": "C" }Full interactive documentation available.
Open Developer DocumentationData quality
From raw sources to trusted building intelligence.
Official Sources
- Government Registries
- Energy Labels
- Building Registries
- Satellite
- Commercial Datasets
Validation
- Quality Rules
- Normalization
- Deduplication
- AI Validation
NXTBLDNG
- Trusted Building Graph
- Unified Building ID
- Digital Twin
Security
Enterprise-grade by default.
SOC 2 · ISO 27001 · GDPR
Certified compliance frameworks with regular third-party audits.
OAuth2 · API Keys · TLS 1.3
Industry-standard authentication with encrypted transport at every layer.
Audit logs · Monitoring
Full request logging, anomaly detection, and real-time alerting.
Integration ecosystem
Works with your stack.
Developers
Ready when you are.
Getting Started
Set up your API key and make your first request in under 5 minutes.
- Create an account
- Generate an API key
- Make your first request
Authentication
OAuth2 flows and API key management for secure access.
OAuth2 · Client Credentials
API Keys · Scoped permissions
API Reference
Complete endpoint documentation with request/response schemas.
80+ endpoints across 10 API categories
FAQ