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NewUK address autocomplete API

UK property data API

Ask about any UK property. One call, one answer.

Value, flood risk, council tax, floor area and more for any UK address, returned as clean JSON. Built for developers and AI agents.

Perfect for
Start your 14-day free trial See all 68 APIs
  • 1 credit for most calls, 1.25p or less
  • 14-day trial with 500 test credits
  • No contract, cancel any time
30.2Msold price records since 1995
29.1MEPC certificates
4.3M+company-owned property records
68available APIs

GET /property/attributes?postcode=S11 8YH&address=10 Example Road


  "address""10 Example Road"
  "postcode""S11 8YH"
  "propertyType""House"
  "builtForm""Semi-Detached"
  "constructionAgeBand""England and Wales: 1930-1949"
  "habitableRooms"5
  "floorAreaSqm"92
  "epc""currentRating""D"
  … more fields

200 OK · 1 credit

See the API docs →

What is Property Insights?

Property Insights is a UK property data API. You send an address, postcode or UPRN and ask one question, such as its value, flood risk, council tax band, EPC rating or registered title, and get a short JSON answer back. It is built for developers and AI agents, and most calls cost 1 credit.

Who it's for
Developers, proptech teams and AI builders. Also lenders, insurers, surveyors and agents.
What it returns
68 endpoints covering value, risk, ownership, address and area data.
How you connect
REST with an x-api-key header, an MCP server, or ChatGPT Actions. OpenAPI spec included.
Where it covers
Sold prices and EPCs cover England and Wales. Other sources vary, and each endpoint documents its coverage.
What it costs
From £25 a month for 2,000 credits. A 14-day trial includes 500 test credits.

Developers first

Make your first API calls in minutes

  • API key auth. One key for all endpoints, sent in the
    x-api-key header.
  • Transparent Credit Usage Most API calls cost 1 credit, manage your balance via your developer portal.
  • Continually Updated All data is refreshed and automatically kept up to date with no effort required from you.
Start your 14-day free trial 500 test credits · cancel any time
Property Valuation API example
curl "https://propertyinsights.co.uk/api/v1/property/valuation?postcode=S11%208YH&address=10%20Example%20Road" \
  -H "x-api-key: YOUR_API_KEY"
Example response excerpt · 200 OK

  "success": true,
  "data": {
    "valuation": {
      "recommended": { "value": 245000, "method": "Comparables", "confidence": 78 },
      "range": { "low": 230000, "mid": 245000, "high": 260000 }
    }
  }

What we believe

Good property data is only half the job.

01

More than rows and fields

Useful documentation, clear responses and the tools to understand production behaviour are part of the product, not extras.

02

No long lock-ins

Change plan or cancel without a harsh contract or a drawn-out exit. We want you to stay because the service earns its place.

03

Built for developers

One API key, OpenAPI documentation, predictable JSON and practical examples help you move from sign-up to a working request quickly.

04

Every call is traceable

Inspect the endpoint, source, status, credits, latency, request parameters and stored response details for each API call.

05

Quality improves over time

Request evidence helps us find inconsistencies in public sources and improve matching, validation and fallbacks as patterns emerge.

06

Usage stays visible

Transparent burn charts show actual credit use against your billing cycle, so there are no surprises at the end of the month.

Developer workspace
Illustrative dashboard data
Calls this cycle1,842Across 11 endpoints
Error rate1.7%31 of 1,842 calls
Average latency238msP95 684ms
Credits remaining31,580On track this cycle
API quality

Reliability by day

This cycle
150100500
2xx success4xx client5xx server
Credit burndown

50,000 credit cycle

On track
Used18,420
Actual remaining31,580
Actual remainingTarget pace
Request history

Open any call and see what happened

req_7F2A91
/api/v1/property/valuationpostcode=ZZ1 1ZZ · address=14 Example Lane
API key200GET238ms8 credits
Request parameters
{
  "postcode": "ZZ1 1ZZ",
  "address": "14 Example Lane"
}
Response summary
{
  "success": true,
  "confidence": 78,
  "creditsCharged": 8
}
Response body
{
  "data": {
    "valuation": "£245,000"
  }
}

Sources and freshness

20 sources, kept current, behind one endpoint

  1. 1Where the data comes from

    • HM Land RegistrySold prices, titles, company ownership
    • Valuation Office AgencyCouncil tax bands
    • EPC registerEnergy certificates
    • Ordnance SurveyAddresses and UPRNs
    • ONSPostcodes, census, inflation, rents
    • Bank of EnglandBank Rate and mortgage rates
    • Environment AgencyFlood risk in England
    • Natural Resources WalesFlood risk in Wales
    • British Geological SurveyGround stability
    • Mining Remediation AuthorityCoal mining areas
    • UKHSARadon
    • DefraNoise and air quality
    • Police.ukStreet-level crime
    • Department for TransportStations, road collisions and traffic counts
    • NHSGP practices, hospitals and pharmacies
    • OpenStreetMap contributorsShops and local services
    • DfE and OfstedSchools and inspections
    • OfcomBroadband and mobile coverage
    • planning.data.gov.ukPlanning constraints
    • Local authoritiesCouncil tax charges and planning applications

  2. 2What we do with it

    Link

    Records from different sources are matched to the same address, UPRN or postcode, so one call can answer across them.

    Refresh

    Each source is checked on a schedule that matches how often it is published. You never run an import.

    Standardise

    Every response uses the same JSON conventions and is documented in one OpenAPI spec, with its coverage and limits stated.

    Live on every call

    • Council tax bandsValuation Office Agency
    • CrimePolice.uk

    Daily

    • Bank Rate & mortgage ratesBank of England
    • InflationONS
    • Council tax chargesLocal authorities

    Weekly

    • Sold pricesHM Land Registry
    • EPC certificatesEPC register
    • Market activityBuilt from sold prices and EPCs

    Monthly

    • Company ownershipHM Land Registry CCOD
    • Planning constraintsplanning.data.gov.uk
    • SchoolsDfE GIAS
    • Addresses & UPRNsOrdnance Survey
    • Postcodes & rentsONS
    • AmenitiesNaPTAN, NHS and OpenStreetMap

    Yearly

    • Road collisions & trafficDepartment for Transport

  3. 3What you call

    propertyinsights.co.uk/api/v1
    • One x-api-key
    • REST
    • MCP
    • ChatGPT Actions

Need to know when something changes? Watch a property by UPRN and get a signed webhook when a sale, EPC, company owner or address changes.

Property change alerts
Start your 14-day free trial 500 test credits · cancel any time

Data coverage

One key, 68 APIs. Find yours by question.

New Address capture

Address autocomplete for forms that need to move.

Help customers find a Great Britain address in a few keystrokes, then return structured fields, its UPRN and coordinates.

Free suggestions35 creditsMonthly credit plans
Explore the address autocomplete API
Start your 14-day free trial 500 test credits · cancel any time

Who builds on it

Built for developers and AI builders

Developers & proptech

Add value, flood risk, council tax and EPC data to a listing, form or report with one key. One call per question, no Land Registry pipeline to maintain.

valuationflood-riskcouncil-tax

AI builders

Give agents real UK property facts as tools. Connect over MCP or ChatGPT Actions and every endpoint becomes a callable function.

mcpall 68 APIs

By industry

Something else?

Tell us what you need to know about a property and we will point you to the calls that answer it.

Talk to us
Start your 14-day free trial 500 test credits · cancel any time

Agent ready

Property data your AI can call as tools

  • Typed tools, strict JSON. Every endpoint has an OpenAPI schema, so agents get structured facts and clean tool selection, not free-text guesses.
  • UK-first coverage. Sold prices, EPCs, demographics, deprivation, broadband, mobile coverage, planning constraints, ownership and title from public and primary national sources.
  • One key, three surfaces. The same API key works across the REST API, the MCP server and ChatGPT Actions.
Read the MCP docs →Set up ChatGPT Actions →
mcp.propertyinsights.co.uk
# Claude Code
claude mcp add property-insights \
  https://mcp.propertyinsights.co.uk

# Then, in any session:
> "What did terraced houses on Bentinck Road
   in Nottingham sell for since 2020?"
Claude DesktopClaude CodeCursorChatGPT Actions

How it works

From sign-up to first response

Create an account

Sign up and start a 14-day free trial with 500 test API credits, so you can start building straight away.

Get your API key

Your key is on the dashboard the moment you sign in. Send it in the x-api-key header on every request.

x-api-key: YOUR_API_KEY

Make a call

Any endpoint, any HTTP client. Structured JSON comes back ready to use.

curl propertyinsights.co.uk/api/v1/epc/search?postcode=S11+8YL
Start your 14-day free trial 500 test credits · cancel any time

Questions

Asked before you got here

How accurate are the valuations?

Every estimate combines House Price Index and comparable-sales methods, and comes with a confidence score from 0 to 100 (under data.valuation.recommended.confidence) plus a low, mid and high range. High-turnover streets score higher; unusual properties score lower, and we tell you rather than hiding it. Use the score to decide when to show the figure and when to ask for a survey.

What are the rate limits?

Limits are per plan and returned on successful responses in X-RateLimit-Limit, X-RateLimit-Remaining and X-RateLimit-Reset headers. If you exceed them you get a 429 with the reset time in the response, never a silent failure. Higher limits are a plan change, not a negotiation.

Where does the data come from?

Primary national and public sources, including HM Land Registry (sold prices, titles and company ownership), the Valuation Office Agency, the domestic EPC register, Ordnance Survey, ONS, the Bank of England, the Environment Agency, the British Geological Survey, Police.uk, the Department for Transport, the NHS, the Department for Education and Ofsted, Ofcom, planning.data.gov.uk, council planning registers and OpenStreetMap. Each endpoint documents its source, coverage and important limitations.

Can I use it from Claude, Cursor or ChatGPT?

Yes. Add the MCP server at mcp.propertyinsights.co.uk to Claude Desktop, Claude Code or Cursor and all 68 APIs are available as typed tools. For GPTs, install the ChatGPT Actions integration. Both authenticate with the same API key (x-api-key) as the REST API.

Is there a free trial?

Yes: a 14-day free trial with 500 test API credits, meant for building and testing. A card is required to start the trial. Move to a paid plan when you go to production.

What does coverage look like across the UK?

Coverage varies by source. Sold prices and EPC certificates cover England and Wales, Ofcom connectivity data covers available UK postcodes, and deprivation and planning constraints currently cover England. Planning source coverage is incomplete, so an empty result does not prove that no constraint applies. Planning applications are collected from some councils only, so check coverage for a postcode before relying on an empty result. Each API response and guide makes its coverage clear.

Start with one address

14 days free with 500 test credits. Your API key is ready as soon as you sign up.

Start your 14-day free trial View the API reference