One API. 29 million properties. Built for developers, PropTech, finance, insurance, and AI teams.
Try it with any UK address. No signup. Real data.
Five audiences, one data foundation. Same API, same schema, same free tier — whether you ship code, mortgages, policies, or prompts.
One API key. 36 endpoints. JSON responses. EPC, ownership, valuations, market data, landlord intelligence — all in one call. 500 free credits to start.
See developer use case →Propalt AI normalises HM Land Registry, Royal Mail PAF, ONS, and five other sources into a single schema. Enrich your platform, your CRM, or your search with real-time property data.
See PropTech use case →Versioned endpoints, 24-hour refresh. Feed your AVM, your underwriting model, or your portfolio monitoring system with EPC, sold prices, ownership history, and market signals.
See finance use case →EPC data, environmental risk scores, comparable sales, and construction data — structured for ML pipelines and underwriting workflows.
See insurance use case →Ask: "Who are the landlords in E1 with 5+ properties?" Get real answers from verified data. No code required. Works on your existing AI subscription.
See estate agent use case →Same data, same key, same source-of-truth — three ways to consume it. Pick what fits your team.
36 endpoints across property, market, landlord, EPC, and planning data. Deterministic JSON. Authenticated with a single Bearer token.
The Propalt MCP Server gives Claude Code, Cursor, Windsurf, and any MCP-compatible client direct access to UK property data. Natural-language queries, structured answers, your existing API key.
Hosted, configurable workflows that turn Propalt's raw data into ready-to-deploy intelligence — landlord prospecting, valuation leads, area benchmarks, and AI assistants tuned for property questions.
Production-ready REST API. OpenAPI 3.1 spec. MCP-compatible. Use it from any language, any framework, any AI tool.
curl -X GET "https://api.propalt.ai/v1/property?uprn=100021888688" \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Accept: application/json"
import httpx
response = httpx.get(
"https://api.propalt.ai/v1/property",
params={"uprn": "100021888688"},
headers={"Authorization": "Bearer YOUR_API_KEY"},
)
data = response.json()
print(data["data"]["address"])const res = await fetch(
"https://api.propalt.ai/v1/property?uprn=100021888688",
{ headers: { Authorization: "Bearer YOUR_API_KEY" } }
)
const { data } = await res.json()
console.log(data.address){
"data": {
"uprn": "100021888688",
"postcode": "SW1A 2AA",
"address": "10 Downing Street, London",
"tenure": "Freehold",
"epc_rating": "D",
"last_sold_price": 4200000,
"last_sold_date": "2019-03-14"
}
}We normalise the canonical sources of UK property data into one consistent schema. No scraping. No estimates where verified data exists.
Ownership, transactions, title data, and full sold-price history.
The authoritative UK address database — 29M delivery points.
Demographics, deprivation indices, and geographic boundaries.
Energy performance certificates, fabric data, and improvement costs.
Council tax bands, rateable values, and rental reference data.
Stamp Duty transaction data that verifies and supplements Land Registry sold prices — especially new-build and off-plan.
Corporate ownership, landlord entities, and director networks.
UPRN, building footprints, geographic identifiers, and boundaries.
We do one thing: UK property data. Here's how we stack up against the alternatives — checked feature-by-feature against each competitor's current public site.
| Feature | Propalt AIUK property data · 2026 | PropertyDatapropertydata.co.uk | Homedatahomedata.co.uk | Street.co.ukdata.street.co.uk | Chimniechimnie.com |
|---|---|---|---|---|---|
| UK property coverage | 29M | 29M | 29M | 32M | 35M |
| Data sources (named) | 12 named8 official + 4 proprietary | Partial list | Partial list | 4+ namedRoyal Mail, OS, Land Registry, ONS | Hundredsper company |
| API endpoints | 36one schema · one contract | 68 | 17 | REST + filters | 500+ attributes / call |
| AI / MCP integration | ✓ChatGPT & Claude · MCP | ✓ChatGPT GPT + MCP | ◐MCP | ✗ | ✗ |
| OpenAPI 3.1 spec | ✓ | ✓ | ◐OpenAPI | ✓ | ✗ |
| Free tier | 500 creditsNo card required | Trial only | ◐100 calls/month, no card | ◐£50 credit on signup | ✗ |
| Public pricing | ✓/pricing | ✓ | ◐Tiered, not itemised | ✓ | ◐Entry pricing public |
| Refresh cadence | 24 hours | Monthly | Monthly | 24 hours | Daily |
| Landlord intelligence | ✓Portfolio-level | ◐Single-property | ✗ | ✗ | ✗ |
| EPC data | ✓Fabric · costs · history | ✓Rating only | ✓ | ✓ | ✓ |
| Sold prices (E&W) | ✓ | ✓ | ✓ | ✓ | ✓ |
Last verified · 28 May 2026 · against each competitor's public website.
Tap any outcome to see the receipts — endpoints, metrics, and the kind of teams already shipping it.
One API key replaces a patchwork of Land Registry exports, EPC PDFs, and VOA downloads. One schema, one bill, zero joins.
Engineering teams typically spend 3–6 months building and maintaining direct integrations with Land Registry, Royal Mail PAF, ONS, MHCLG EPC, OS, HMRC, Companies House, and VOA. Each has a different schema, identifier scheme, and refresh cadence.
Propensity-to-sell scores and landlord portfolio data let you find motivated vendors before they hit Rightmove.
Combine portfolio-size, transaction history, ownership tenure, and EPC expiry signals to score every UK property by likelihood to come to market — without manual sourcing.
Flood risk, EPC fabric, and planning history in a single API call. Build automated risk models that audit-trail every decision.
One call returns flood risk, conservation/listed status, recent planning activity, EPC fabric, and material construction type — for any UK postcode or UPRN. Used at point-of-quote by insurers and lenders.
Our MCP server gives AI assistants 12 typed tools over real UK property data. No hallucinations. No stale context.
Connect Claude Code, Cursor, Windsurf, or any MCP-compatible client. 12 typed tools at launch — get-property, get-rents, get-landlords, get-valuation, get-planning, and more — all using the same API credits.
UK property data is fragmented across government registers, local authorities, and private feeds. Different schemas, different cadences, different identifiers. Propalt takes that off your roadmap.
UK property data lives across eight independent registers, each maintained by a different government body. HM Land Registry holds ownership and sold prices for England & Wales. Royal Mail PAF is the only authoritative address source — and licensed separately. EPC certificates are publicly downloadable but updated on different schedules per region. Companies House identifies corporate landlords. ONS publishes demographics at LSOA level. None of these systems share identifiers, schemas, or update cadences. Joining them — and keeping the join fresh — is a multi-quarter engineering project.
We resolve every property to a single canonical identifier and back-fill the same record with whatever each source contributes — ownership from Land Registry, EPC fabric from MHCLG, building footprint from Ordnance Survey, council tax band from VOA, corporate ownership chains from Companies House. The output is a deterministic JSON shape: same fields, same types, same nullability rules on every call. You write your code once.
Propalt replaced six different data integrations on day one. We shipped our valuation tool a quarter ahead of plan.
Bypass sales. Read the docs, try the API, ship in an afternoon.
Complete endpoint documentation with request/response schemas, authentication, rate limits, and interactive examples.
View API Docs →Get your first property lookup running in under 60 seconds. Covers authentication, your first API call, and reading the response.
See MCP Tools →Connect Propalt to Claude Code, Cursor, Windsurf, or any MCP-compatible AI assistant in three lines of config.
Explore Developer Portal →Machine-readable: llms.txt · API Reference
How UK estate agents connect ChatGPT and Claude to 29m UK properties and 2.1m landlord records with Propalt AI, with the exact prompts for each step.
Material information reform makes upfront property data mandatory, not optional. The rule is not the hard part. Sourcing the data behind it, property by property, is. See how the Propalt AI property data API supplies the Parts A, B and C data agents now need.
Book a 20-minute demo to see Propalt against your use case, or start building today with the free tier.