What is a UK property data API?

It is an HTTP interface that returns structured data about a UK address as JSON, so you can read it in code instead of downloading, cleaning and joining the public registers yourself. Ours is keyed on the property: send an address or a postcode and get back sale history, energy certificates, planning applications and area statistics in one predictable shape.

Is there a free UK property data API?

Yes. The Free plan gives you 100 requests a month with no card, and it includes every endpoint rather than a cut-down subset. It is the same key, the same limit headers and the same responses as the paid plans, so what you build against Free is what ships.

How is this different from the Land Registry and EPC open data?

The registers are free and public, and the work is not in downloading them. It is in matching a sale, a certificate and a planning application to the same address, holding stable identifiers so the join survives the next monthly release, and answering in milliseconds instead of a batch job. You get one key, one response envelope and explicit nulls where nothing is held.

What counts as a request?

One HTTP call to one endpoint is one request, whichever endpoint it is and however much it returns. A list of 50 properties costs the same as a single postcode lookup. A 400 or a 404 from an endpoint still counts, because the lookup ran. Calls we reject before they reach an endpoint do not count: a missing or revoked key, and any 429 for the burst limit or a spent quota.

Do I need to credit the data?

Source data is published by UK public bodies under the Open Government Licence v3.0. We aggregate it, match it to individual addresses and serve it as JSON. OGL is attribution, not endorsement.

Can I cancel or change plan later?

Yes, at any time and from the console. There is no annual contract and no minimum term. A cancelled subscription drops you back to the Free plan's limits rather than switching your keys off, so nothing breaks without warning.

Email info@ukpropertylooker.com with your key prefix (the visible part, never the whole key), the endpoint and the time of the request. We answer developer questions from the same inbox, including requests for data we do not expose yet.

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UK Property Looker · Data API

The UK property data API for whatever you’re building

One UK property data API for Land Registry sold prices, EPC certificates, planning applications, schools, transport, crime, air quality and house prices, all matched to the same home and returned as clean JSON. Thirteen endpoints, one key, and no address matching of your own.

Get a free API key Read the docs

100 free requests a month
No card needed
One request is one request

Property record200 OK

7 Ashwood Mews, St Albans, AL1 2AY

AL1 2AY4 recorded sales

Valuation: £663,000; Our estimate
EPC band: E; C potential
Flood risk: none; Rivers and sea

The valuation is our automated estimate rather than an asking price, the band comes off the newest certificate, and flood risk is the Environment Agency rivers and sea band.

Also on this property

Sale history
EPC certificates
Planning applications
Attributes
Feature flags
Schools
Transport
Crime
Air quality

GET /api/v1/properties/7-ashwood-mews-st-albans-al1-2ay

UK properties, matched address by address: 30M+
HM Land Registry sales, England and Wales: 29.5M
REST endpoints, one API key: 13
Where the sale history starts: 1995

Data sourced from official bodies

What are you building?

Four things people ask this API for on the first day, and the call that answers each one.

“I need to value four thousand addresses by Friday”

Take the record for each property, add its Land Registry sale history and the district's mean and median by year. Three calls a property, no scraping.

GET /properties/{slug}

“I need the EPC on everything we manage”

Every certificate lodged against the home, newest first, with the band, the SAP score, the fabric and heating elements, emissions and running costs.

GET /properties/{slug}/epc

“I need to know what an area is actually like”

One outward code returns house prices by year, crime by category and by month, air quality averages and the post towns the district covers.

GET /areas/{outward}

“I have a spreadsheet of addresses and no identifiers”

Search turns typed text into a stable slug, and every other endpoint is keyed by it. Postcodes and districts resolve too, in any spelling.

GET /search/addresses

What the UK property data API returns

Eight datasets, joined to the same address. Coverage is stated on every card, because the registers stop where they stop.

Property record

Address, coordinates, attributes, our valuation, sale and certificate counts, environmental indicators and links to every sub-resource.

30M+ properties, each keyed by a stable slug

Sale history

Every open-market sale recorded against the address, newest first, with the Land Registry transaction id, estate type and PPD category.

29.5M HM Land Registry sales, England and Wales, from 1995

EPC and energy

Certificates regrouped so each element carries its description beside the band the assessor gave it, with emissions and estimated running costs.

MHCLG register, England and Wales, current and potential SAP scores

Planning applications

The council's own description in full, never truncated, with decision, dates, a link to the portal and a classification of the work proposed.

Matched to the address, with a 0 to 1 confidence score

Schools

Open schools near a postcode, nearest first, with phase, type, age range, pupil numbers, website and the department's own URN.

DfE Get Information about Schools, England, 250 m to 5 km radius

Transport

Rail, tube, tram, bus, ferry and airport stops near a postcode, deduplicated so a facing pair of bus stops appears once.

NaPTAN active stops, up to 30 a call, with the national ATCO code

Crime and safety

Street-level crime for a district, summed by category and by month, with a rate per 1,000 residents and a six-month trend.

Police.uk feed: England, Wales and Northern Ireland

Environment and area

Flood risk band, modelled road noise day and night, air quality averages, and mean, median and sale count for every year on record.

Environment Agency, DEFRA and Land Registry, by postcode and district

Type an address. Get back the property.

Two calls from a line of text in a spreadsheet to the full record. No address matching, no fuzzy joins, no reconciliation of your own.

1
Search the address you have
GET /api/v1/search/addresses?q=7%20Ashwood%20Mews
Typed text in, identifiers out. A postcode, a district, a name with a number or a street name on its own are all recognised without you saying which is which.
- kind tells a property apart from a street or a building
- slug is the identifier every other endpoint takes
- displayName and postcode, ready to show a user
- propertyCount on a street, so you know what narrowing it costs
2
Retrieve the property
GET /api/v1/properties/{slug}
One call returns the home. Every block that depends on a source we do not hold everywhere is an explicit null rather than a missing key.
- Postal address, postcode centroid, district and locality
- Attributes: sub-type, bedrooms, council tax band, floor area
- Our valuation, the latest sale, and how many of each we hold
- Flood risk band and modelled road noise, day and night
- Links to sale history, EPC, planning, the postcode and the area

/api/v1/properties/7-ashwood-mews-st-albans-al1-2ay

curl -H "Authorization: Bearer upl_live_Ab12Cd34EfGhIjKlMnOpQrStUvWxYz01" \
  "https://ukpropertylooker.com/api/v1/properties/7-ashwood-mews-st-albans-al1-2ay"

View the property endpoint

Thirteen endpoints, one key

Every property data endpoint is included on every plan, Free included. One call is one request whichever one you make.

Search

GET/api/v1/search/addressesFind properties, streets and buildings by typed address

Properties

Postcodes

Areas

Account

GET/api/v1/usageYour plan and usage

Read the full UK Property Data API documentation

From here to your first response in five minutes

Self-serve end to end. Nobody has to approve you and nothing has to be provisioned.

1
Create a free account
A magic link, no card, no sales call. You land on the console on the Free plan with 100 requests a month and every endpoint unlocked.
2
Generate a key
One click in the console. The key is shown once and stored only as a hash, so keep it somewhere safe. Hold up to 10 at a time, one per environment, and revoke any of them instantly.
3
Make the first call
Send the key as a bearer token and read the JSON. Every response carries your rate-limit and quota headers, so you know where you stand from the first request.

Your first call

curl -H "Authorization: Bearer upl_live_Ab12Cd34EfGhIjKlMnOpQrStUvWxYz01" \
  "https://ukpropertylooker.com/api/v1/postcodes/AL1%202AY"

A postcode lookup, returning the district, the flood risk band, the road noise figures and how many properties we hold in it.

Why build on this one

The registers are public. The work we have already done is joining them to one address and holding the shape steady.

Matched to the property, not the postcode

Over 30 million UK properties and 29.5 million Land Registry sold prices, matched address by address. A sale, a certificate and a planning application come back joined to the same home rather than to a rough area.

One predictable envelope

Success is always { data }, lists add { meta }, errors are always { error: { code, message, status } }. Fields are camelCase, dates are ISO 8601, money is integer pounds, distances are metres, and a missing value is an explicit null rather than an absent key.

Flat pricing you can reason about

One request is one request on every plan and every endpoint. No credit weighting, no premium tier per dataset, no annual contract. Quotas reset on the 1st of the month UTC and every response carries its own usage headers.

Stable identifiers and a published spec

Every property has a slug you can store, and it is the same one the public site uses. Postcodes accept any spelling, areas are keyed by the outward code. The whole surface is published as an OpenAPI document, so you can generate a client rather than hand-writing one.

Built for every property workflow

The same endpoints, put to six quite different uses.

Valuers and surveyors

Comparable sold prices, floor areas and certificate history for a street, pulled before the site visit rather than typed up after it.

Proptech and mortgage platforms

Enrich an application the moment an address is entered: sale history, energy band, tenure signals and the area around it, in one round trip.

Investors and portfolio managers

Score a district on price movement by year, crime rate per 1,000 residents and transport access before you commit to a viewing.

Estate agents and conveyancers

Answer the questions that hold a sale up: what it last sold for, what has been applied for, which schools are within a mile.

Insurers and risk teams

Flood risk band, modelled road noise, construction age and wall type from the certificate, and the crime picture for the district.

Developers and data scientists

A clean feature set for a model: numeric fields, explicit nulls, stable slugs to join on and an OpenAPI document to generate a client from.

Pay for requests, nothing else

Every endpoint is included on every plan, Free included. Move the slider to your volume and the plan picks itself.

How many requests a month?

5,000

requests a month

100More than 500,000

Your plan

Growth

£79a month

Includes: 20,000 a month
Burst: 120 a minute
Per 1,000 requests: £3.95

Choose Growth

How we compare

The other places you could buy UK property data, and what each one publishes about itself.

UK Property Looker compared with Homedata, PropertyData and Street Data, by pricing model, coverage and the datasets each one returns.
Feature	UK Property Looker	Homedata	PropertyData	Street Data
Pricing model	Flat monthly plans, one request is one request	Monthly plans, calls weighted per endpoint (address find 2 calls, retrieve 5)	Monthly plans, credit based	Pay as you go, priced per property returned and per data tier
Free to start	100 requests a month, no card	100 calls a month, no card	14-day trial	£50 credit on signup
Entry price	£19 a month for 2,000 requests	£49 a month for 2,000 calls	From £28 a month	From £0.10 per property
Self-serve signup and key	Yes	Yes	Yes	Yes
Coverage	UK postcodes and areas; EPC and Land Registry for England and Wales	29M properties, UK	England and Wales	England and Wales only
Sale history (HM Land Registry)	Since 1995	Yes	Yes	Yes
EPC certificates	Full certificate detail	Yes	Yes	Yes
Planning applications	Matched to the property	Yes	Not published	Not published
Schools and transport	Yes	Schools yes, transport not published	Not published	Not published
Crime and air quality	Yes	Crime via area indices; air quality yes	Not published	Not published
Live listings and market activity	No	Yes	Not published	Via Spectre
OpenAPI spec and generated docs	Yes	Not published	Not published	Not published

As published on each provider's website. Tell us if something is out of date.

UK property data API questions

Coverage, limits, keys and what happens when you cancel.

The property record itself (address, coordinates, attributes, our valuation and environmental indicators), HM Land Registry sold prices, EPC certificates from the MHCLG register, planning applications matched to the address, schools from the Department for Education, transport stops from NaPTAN, Police.uk crime by district, air quality, flood risk band, modelled road noise and house prices by year.

Partly, and it is worth knowing which parts before you build. Postcodes, districts and properties are held UK wide, and search covers the whole country. HM Land Registry sold prices and EPC certificates are England and Wales only, because those registers are: Scotland and Northern Ireland run their own. Schools come from the Department for Education register, which is England only. Police.uk crime covers England, Wales and Northern Ireland, and not Police Scotland. Where we hold nothing, the field comes back as an explicit null rather than being dropped from the response.

There are two limits and both come from your plan. The burst limit is requests per rolling 60 seconds, from 10 a minute on Free up to 1,000 a minute on Enterprise. The quota is requests per calendar month, from 100 on Free up to 500,000 on Enterprise. Quotas reset at 00:00 UTC on the 1st of each month. Every response carries X-RateLimit and X-Quota headers so you can track both without guessing, and a 429 tells you which limit you hit.

Keys are sent as an Authorization: Bearer header, never in a query string, so they stay out of logs and referrers. Every key starts with upl_live_ so a leaked one is easy to spot in a repository scan. We store only a hash, which is why the key is shown once at creation and never again. You can create several keys, one per environment, and revoke any of them instantly from the console. Keys belong on your server, not in a browser or a mobile app.