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Tactical — PAF ruling response

Address API After the PAF Ruling: A Compliant Alternative

The October 2025 High Court ruling on Royal Mail PAF licensing disrupted several popular UK address lookup APIs. If you are migrating away from a PAF-dependent provider, Homedata's UPRN-anchored address API — built on OS AddressBase Premium — is a compliant, feature-rich alternative with a free tier.

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October 2025 ruling summary

The High Court ruled that certain address API providers had infringed Royal Mail's intellectual property by distributing PAF-derived data without a valid sublicence. Affected services were required to cease distribution or obtain direct Royal Mail licences. Homedata uses OS AddressBase Premium data and is not subject to this ruling.

PAF vs OS AddressBase — what developers need to know

Attribute Royal Mail PAF OS AddressBase (Homedata)
Coverage~30M postal addresses39M+ UPRNs (all addressable locations)
UPRN includedNoYes — every result
Non-deliverable propertiesNot coveredIncluded
Scottish addressesYesYes
Property data enrichmentNot availableEPC, sold prices, flood risk via same API
PAF ruling exposureHigh (licensing dependent)None — OS data, not PAF
Free tierVia licensed providers only100 calls/month, no card

Migration from getAddress or PAF providers

The Homedata address API is a drop-in replacement for getAddress and similar providers. The endpoint accepts a partial address or postcode and returns a list of matching addresses with canonical format, UPRN, and coordinates.

Unlike PAF-based providers, every result includes a UPRN — enabling immediate enrichment with EPC, flood risk, sold prices, and council tax data without a second address-matching step.

Migration guide in docs →
GET /api/address/find/?query=SW1A+2AA
Authorization: Api-Key YOUR_KEY

{
  "results": [
    {
      "uprn": "100021887955",
      "address": "10 Downing Street",
      "town": "London",
      "postcode": "SW1A 2AA",
      "latitude": 51.5034,
      "longitude": -0.1276,
      "classification": "commercial",
      "formatted": "10 Downing Street, London, SW1A 2AA"
    }
  ],
  "total": 1
}

Frequently asked questions

What did the October 2025 PAF ruling mean?

The High Court ruled that distributing PAF data without a Royal Mail licence infringes their IP. Providers using unlicensed PAF were required to cease or obtain direct licences.

What is the difference between PAF and OS AddressBase?

PAF covers ~30M postal addresses. OS AddressBase covers 39M+ UPRNs including non-deliverable properties, with UPRN on every record for property data enrichment.

Is Homedata affected by the PAF ruling?

No — Homedata uses OS AddressBase Premium, not Royal Mail PAF. It is a compliant alternative unaffected by the ruling.