UK Property Data API
Every UK property.
One API call.
Risk, valuation, geospatial and market data for 35M+ residential and commercial properties. Built for insurers, lenders and proptech teams who need answers in seconds, not days.
GET /residential/uprn/999000000002 { "property_type": "Semi-detached","bedrooms": 3,"floor_area": 98,"current_energy_rating": "D","council_tax_band": "C","property_value": 285000,"estimated_rebuild_cost": { "lower_bound": 80000, "estimate": 160000, "upper_bound": 240000 },"flood_risk_rivers_sea": 0,… 300+ fields}
35M+
UK residential & commercial properties
300+
data points per property record
£0.05
per property, pay as you go
Up to £16
free balance when you sign up, no card
Working with organisations across insurance, government and property
Award-winning property data
What's in a record
300+ data points, eight categories, one UPRN
Every source we hold is merged into a single record per property, so you never reconcile datasets yourself. Query one field or all of them; you only pay for what you receive.
Construction
Roof analysis, header tanks, pre-builds, storeys
Physical attributes
Bedrooms, bathrooms, internal area, grounds size
Type & description
Property type, listed status, occupancy, images
Risks & perils
Flood, crime, traffic, pollution, land, cladding
Market valuations
AVM, rebuild cost, sales history, market stats
Geospatial
UPRN, geocodes, localities, Royal Mail identifiers
Topology
Garden, solar panels, building footprints, child & sibling properties
Environment
EPC & energy, heating sources, nearby schools & transport
Who it's for
Built for teams that price, lend and decide on property
Same API, same record, different questions. Pick the products that fit your workflow.
Insurers, risk & underwriting
Land value, rebuild cost and peril data that several of the UK's savviest insurers use to improve loss ratios, underwriting accuracy, premium optimisation, underinsurance detection and fraud checks.
Lenders, credit & mortgages
Instant AVMs, bill affordability prediction and property risk in one call, so approval and rejection decisions happen in seconds rather than days.
Proptech, agents & legal
Faster access to accurate property facts means better customer service, higher retention and fewer surprises during conveyancing.
Investors & landlords
Assess risk and value across whole areas to make sharper off-market purchases and rental investment decisions.
How it works
Try it now, sign up when you need real data
Try the sandbox, no account
Open the dashboard and pick any free sample address at CH1 1MN: 30 synthetic test properties with full reports and batch downloads. No account, no API key.
Create a free account for real data
Sign up and get an API key instantly, with up to £16 of free balance. No card, no sales call.
Query by UPRN or address, or take it all
Call the REST API with a UPRN, an address or coordinates and choose the fields you need. Or have your whole portfolio, or every UK property, delivered as a flat file with optional monthly updates.
Source of truth
Built on the UK's authoritative datasets
Our data science team has spent 300,000+ hours connecting hundreds of proprietary, private and public sources, then enriching them with AI models. The result is one consistent record you can trust.
Plus hundreds more: planning portals, EPC registers, listings, imagery and proprietary models.
Hover or touch to explore the table
See the data live
We publish 10% of it for free, in public
We're confident enough in our data to put it in front of everyone. More than 400,000+ people use chimnie.co.uk every month to research UK homes.
The API returns the full record behind every page you see there.
Customers
Loved by data, pricing and engineering teams
“Our data science team needed large volumes of UK property data for AI modelling. The Chimnie team started preparing delivery for us within minutes of our request. Amazing experience, unbeatable value and excellent data quality.”
Martin Collignon
Founder, Lun Energy
FAQ
Frequently asked questions
What is Chimnie?
Chimnie is a UK property data API. It returns 300+ attributes for any of 35M+ residential and commercial properties: construction, physical attributes, valuations, rebuild costs, flood and other perils, planning, EPC, geospatial and market data. Insurers, lenders and proptech teams use it via API or flat file.
Where is the data sourced from?
We connect hundreds of proprietary, private and public datasets, including HM Land Registry, Ordnance Survey, Royal Mail, ONS, BGS and Defra, and enrich them with AI modelling into a single Chimnie record per property.
What is a property record?
Each Chimnie record holds all information associated with a single property at a specific address, keyed by UPRN. Data from every source is merged into that one record.
Do I need an account to try it?
No. The dashboard and the CH1 1MN sandbox addresses work without an account or API key and return synthetic test data. For real properties, create a free account and start with up to £16 of free balance.
How much does it cost?
Pay as you go from £0.05 per property, with request packs from 10,000 requests at 20% to 70% off, and flat-rate pricing for the full dataset. New accounts get up to £16 of free balance and there is no minimum commitment. See pricing
What fields are available?
The complete field list, with types and examples, is published in our API documentation. View the schema
Can I get the data as a file instead of an API?
Yes. Any subset of fields can be delivered as a flat file (CSV) for your whole portfolio or the full UK dataset, with optional monthly updates. Talk to us about flat files
Start with up to £16 of free balance
Sign up, grab an API key and query any of the 35M+ UK properties in minutes. No card, no contract.