Free UK land data API

GET /sold-prices

HM Land Registry price-paid sales at a postcode (or the nearest postcodes when there are none), each uprated to today's value with the UK House Price Index.

curl "https://buyland.co.uk/api/v1/sold-prices?postcode=CW5%207PX&limit=3"

{
  "postcode": "CW5 7PX",
  "scope": "nearby",
  "district": "Cheshire East",
  "region": "North West",
  "count": 3,
  "sales": [
    {
      "price_paid": 250000,
      "date": "May 2009",
      "address": "Bridgemere Wildlife Park, Bridgemere",
      "estimated_today": { "value": 412000, "uplift_pct": 64.8, "index_month": "2026-06", "region_index": "North West" }
    }
  ],
  "source_url": "https://buyland.co.uk/property-valuation?postcode=CW5%207PX",
  "attribution": "Data provided by BuyLand.co.uk ... Open Government Licence v3.0."
}

GET /land-value

A guide value range for a plot from regional per-acre rates, land type and planning status. Plots under 0.05 acres switch to the small-plot (adjacency) model.

curl "https://buyland.co.uk/api/v1/land-value?postcode=GL7%205NX&acres=2.5&land_type=Pasture"

{
  "postcode": "GL7 5NX",
  "acres": 2.5,
  "land_type": "Pasture",
  "planning": false,
  "low": 21000,
  "mid": 27000,
  "high": 34000,
  "price_per_acre": 10800,
  "region": "South West",
  "method": "regional-floor",
  "factors": [{ "label": "Pasture in the South West", "impact": "" }],
  "note": "Indicative guide value only. ...",
  "source_url": "https://buyland.co.uk/valuation",
  "attribution": "..."
}

GET /property-value

An indicative value for a dwelling, from HM Land Registry sales at (or near) the postcode uprated to today with the UK House Price Index. Not a survey or mortgage valuation.

curl "https://buyland.co.uk/api/v1/property-value?postcode=CW5%207PX&bedrooms=4"

{
  "postcode": "CW5 7PX",
  "bedrooms": 4,
  "bathrooms": 1,
  "found": true,
  "low": 630000,
  "mid": 700000,
  "high": 770000,
  "comparables_used": 2,
  "comparables_scope": "postcode",
  "district": "Cheshire East",
  "region": "North West",
  "method": "index-uprated-comparables",
  "note": "Indicative value for a dwelling from local sold prices ...",
  "source_url": "https://buyland.co.uk/property-valuation?postcode=CW5%207PX",
  "attribution": "..."
}

GET /parcel

The registered-land parcel (HM Land Registry INSPIRE polygon) containing a point, with area, simplified GeoJSON geometry, the number of mapped buildings inside it, and which valuation endpoint fits.

curl "https://buyland.co.uk/api/v1/parcel?lat=53.0066&lng=-2.4257&postcode=CW5%207PX"

{
  "found": true,
  "inspire_id": "20765559",
  "area_sqm": 2501,
  "area_acres": 0.618,
  "centroid": { "lat": 53.00664, "lng": -2.42570 },
  "buildings_count": 0,
  "suggested_valuation": "land-value",
  "geometry": { "type": "Polygon", "coordinates": [[[-2.4262, 53.0064], ...]] },
  "note": "INSPIRE polygons show the indicative extent of a registered title, not the legal boundary. ...",
  "source_url": "https://buyland.co.uk/report?lat=53.0066&lng=-2.4257",
  "attribution": "..."
}

GET /constraints

Which national planning designations intersect a small square around a point: flood zone, green belt, AONB, national park, conservation area, listed buildings, scheduled monuments, SSSI, ancient woodland, TPO zones, common land, Article 4 areas and the brownfield register. 13 of the 35 checks in a Plot Report.

curl "https://buyland.co.uk/api/v1/constraints?lat=51.2287&lng=-0.4000&radius_m=50"

{
  "lat": 51.2287,
  "lng": -0.4,
  "radius_m": 50,
  "checks": [
    { "key": "flood_zone", "title": "Flood zone (rivers & sea)", "present": false, "entities": [] },
    { "key": "green_belt", "title": "Green belt", "present": true, "entities": [{ "name": "Mole Valley", "reference": "...", "dataset": "green-belt" }] },
    { "key": "aonb", "title": "National Landscape (AONB)", "present": true, "entities": [{ "name": "Surrey Hills", "reference": "...", "dataset": "area-of-outstanding-natural-beauty" }] },
    { "key": "sssi", "title": "SSSI", "present": true, "entities": [{ "name": "Hackhurst and White Downs SSSI", "reference": "...", "dataset": "site-of-special-scientific-interest" }] }
  ],
  "flagged": ["green_belt", "aonb", "sssi"],
  "note": "13 of the 35 checks in a BuyLand Plot Report ...",
  "source_url": "https://buyland.co.uk/report?lat=51.2287&lng=-0.4",
  "attribution": "..."
}

Quick starts

JavaScript (browser or Node 18+):

const r = await fetch("https://buyland.co.uk/api/v1/sold-prices?postcode=SW1A%201AA");
const data = await r.json();
console.log(data.sales[0], data.attribution);

Python:

import requests
r = requests.get("https://buyland.co.uk/api/v1/constraints", params={"lat": 51.2287, "lng": -0.4})
data = r.json()
print(data["flagged"], data["source_url"])

For LLM tool use, point your agent at the OpenAPI spec:

https://buyland.co.uk/api/v1/openapi.json

What is deliberately not here

Anything that costs a statutory fee. Official title registers, title plans and filed deeds are ordered through the site at cost (£7.50 per document, the HM Land Registry fee plus 50p) and never through this API. The full Plot Report (35 checks, planning history, access, structures, valuation, narrative) is likewise a product, not an endpoint: the constraints endpoint gives you the free third of it and links to the rest.

Attribution and licences

Sold prices contain HM Land Registry data © Crown copyright and database right 2026. Parcels are derived from HM Land Registry INSPIRE Index Polygons © Crown copyright and database rights. Designations come from planning.data.gov.uk (MHCLG and contributing bodies). All are licensed under the Open Government Licence v3.0. Valuations and constraint groupings are BuyLand's own work and are provided as indicative information, not advice.

Use the attribution string from each response, and link to its source_url. If you build something with this, we'd genuinely like to hear about it: info@buyland.co.uk.