Data & licensing

Fifteen public datasets, one address key, every licence checked

Almost everything we use is Open Government Licence v3.0 — free for commercial reuse with attribution. The few datasets that are not are listed openly below.

Energy Performance Certificates

Open · in platform

MHCLG — Open Data Communities

  • Current and potential rating, SAP score
  • Floor area, property and built form type
  • Walls, roof, glazing, heating and main fuel descriptions
  • Recommended improvement measures with indicative cost and saving
Licence
OGL v3.0 (free API, registration required)
Access
Bulk download and REST API, commercial reuse permitted with attribution
Join
UPRN / address + postcode

HM Land Registry Price Paid Data

Open · in platform

HM Land Registry

  • Every recorded residential transaction since 1995
  • Price, transfer date, transaction category
  • Freehold / leasehold flag, new build indicator
Licence
OGL v3.0 (free)
Access
Monthly full and change-only CSV, SPARQL endpoint
Join
Address + postcode → UPRN

Index of Multiple Deprivation 2019

Open · in platform

MHCLG

  • Overall decile and rank
  • Income, employment, health domains
  • Barriers and living environment
Licence
OGL v3.0 (free)
Access
Direct file download from GOV.UK
Join
LSOA code

ONS Postcode Directory & Census 2021

Open · in platform

Office for National Statistics

  • Full geography hierarchy and centroids
  • Rural / urban classification
  • Census tenure mix, household composition, occupancy
Licence
OGL v3.0 (free) — includes OS and Royal Mail attribution
Access
ONS Open Geography Portal, Nomis API
Join
Postcode → LSOA, MSOA, ward, LA, region

OS Open UPRN, USRN & Linked Identifiers

Open · in platform

Ordnance Survey (OS Data Hub)

  • UPRN coordinates
  • UPRN ↔ USRN ↔ TOID links
  • Street identifiers
Licence
Open Government Licence via OS OpenData (free)
Access
OS Data Hub download / API with a free key
Join
The address spine itself

Flood risk — rivers, sea and surface water

Open · in platform

Environment Agency (Defra DSP)

  • Risk of Flooding from Rivers and Sea band
  • Risk of Flooding from Surface Water band
  • Flood Map for Planning zones 1–3
  • Climate-change scenario extents, reservoir extents
Licence
OGL v3.0 (free, open data)
Access
Defra Data Services Platform: WMS/WFS feeds and geodatabase downloads
Join
Point-in-polygon on property coordinates

Listed buildings & heritage assets

Open · in platform

Historic England / Cadw

  • Listing grade (I, II*, II)
  • Scheduled monuments
  • Registered parks and gardens
Licence
OGL v3.0 (free) — NHLE open data
Access
Historic England open data downloads, planning.data.gov.uk API
Join
Point match to listing coordinates / polygons

Planning constraints

Open · in platform

MHCLG — planning.data.gov.uk

  • Conservation areas
  • Article 4 directions (affect permitted development)
  • Green belt, AONB, national parks, tree preservation orders
Licence
OGL v3.0 (free API)
Access
Open JSON/GeoJSON API, no key required
Join
Point-in-polygon

Fuel poverty (LILEE) sub-regional

Open · in platform

DESNZ

  • Households in fuel poverty
  • Fuel poverty gap
  • Time series by LSOA
Licence
OGL v3.0 (free)
Access
GOV.UK statistics tables
Join
LSOA / local authority

Sub-national energy consumption

Open · in platform

DESNZ

  • Domestic gas and electricity consumption
  • Meter counts
  • Off-gas-grid indicators
Licence
OGL v3.0 (free)
Access
GOV.UK statistics tables (annual)
Join
LSOA / MSOA / postcode

Connected Nations broadband & mobile

Open · in platform

Ofcom

  • Max download speed available
  • Gigabit and superfast coverage
  • Mobile signal by operator
Licence
OGL v3.0 (free)
Access
Ofcom open data downloads
Join
Postcode

HM Land Registry INSPIRE Index Polygons

Open · roadmap

HM Land Registry

  • Indicative freehold extent
  • INSPIRE ID → title lookup
Licence
OGL v3.0 — requires HMLR + OS attribution
Access
Free per-local-authority downloads
Join
Polygon to UPRN point

Local authority open data (HMO & selective licensing)

Open · roadmap

Individual councils

  • Licensed HMOs
  • Selective licensing zones
  • Enforcement notices
Licence
Mostly OGL v3.0, varies per council
Access
Council open data portals, coverage is patchy
Join
Address / UPRN

OS AddressBase Premium / Royal Mail PAF

Licence required

Ordnance Survey / Royal Mail

  • Full address hierarchy
  • Classification codes
  • Higher match rates than open UPRN alone
Licence
Commercial licence required — not open
Access
Paid licence, or free under the Public Sector Geospatial Agreement for eligible bodies
Join
Definitive address matching

HMLR Title / Overseas & UK Companies ownership

Licence required

HM Land Registry

  • Corporate proprietor names
  • Overseas ownership
  • Tenure and price paid on register
Licence
Free datasets for corporate/overseas owners; individual titles are chargeable
Access
Free CCOD/OCOD downloads (licence acceptance); title registers £3 each
Join
Title number / INSPIRE ID

How matching works

  1. STEP 1

    Normalise

    Addresses are standardised and cleaned across all sources.

  2. STEP 2

    Match

    Certificates and transactions are linked on address plus postcode, with confidence scoring.

  3. STEP 3

    Chain

    Transactions are ordered per property to derive holding period and tenure length.

  4. STEP 4

    Enrich

    Coordinates attach flood, heritage and planning constraints; postcodes attach ONS geography, deprivation, fuel poverty, energy use and broadband.

Licensing position

Open Government Licence v3.0

Covers EPC, Price Paid, IMD, ONS, Environment Agency, Historic England, planning.data.gov.uk, DESNZ and Ofcom. Free to copy, adapt and use commercially — including in a paid API — provided the source is attributed.

Attribution we carry

“Contains public sector information licensed under the Open Government Licence v3.0”, plus HM Land Registry Crown copyright and Ordnance Survey AC0000851063 wording wherever polygons or coordinates are reused.

Not open

OS AddressBase Premium and Royal Mail PAF need a commercial licence (or PSGA eligibility). Individual HMLR title registers are chargeable per title. We do not redistribute either — open UPRN is used as the address spine instead.

Licence terms verified against the publishers’ own conditions of use. Terms can change; each ingestion run records the licence version in force at the time of download.