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Heritage status

Check whether a UK property is a listed building or sits inside a conservation area — both of which materially restrict what alterations are allowed without planning permission. Data is sourced from Historic England and local authority planning records. Required scope: planning:read Cost: 1 request per call Available on: Starter, Professional, Business

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Get heritage status for a property

GET /api/v1/heritage/property/{property_id}

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Request

curl https://api.propaideals.co.uk/api/v1/heritage/property/5fa1b2c3-d4e5-6f78-9012-3456789abcde \
  -H "Authorization: Bearer paid_..."

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Response

{
  "data": {
    "property_id": "5fa1b2c3-d4e5-6f78-9012-3456789abcde",
    "is_listed_building": false,
    "in_conservation_area": true,
    "address": "12 Example Road, Manchester",
    "postcode": "M1 1AA"
  }
}
FieldTypeDescription
is_listed_buildingbooleanProperty is on Historic England’s National Heritage List (Grade I, II*, or II)
in_conservation_areabooleanProperty sits within a designated conservation area
addressstringProperty address
postcodestringPostcode

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Heritage aggregates by area

GET /api/v1/heritage/area/{outcode}
Returns counts of listed buildings and conservation properties in an outcode plus a small sample of each. Useful for due diligence on heritage-heavy areas where extension permissions are tightly restricted.

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Request

curl https://api.propaideals.co.uk/api/v1/heritage/area/SW1 \
  -H "Authorization: Bearer paid_..."

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Response

{
  "data": {
    "outcode": "SW1",
    "listed_buildings_count": 287,
    "conservation_count": 1842,
    "sample_listed": [
      {
        "id": "5fa1b2c3-...",
        "address": "12 Heritage Square, London",
        "postcode": "SW1A 1AA",
        "price_numeric": 4200000
      }
    ],
    "sample_conservation": [
      {
        "id": "9c8d7e6f-...",
        "address": "5 Conservation Way, London",
        "postcode": "SW1A 2BB",
        "price_numeric": 1850000
      }
    ]
  }
}

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Why this matters

Property statusRestrictions
Grade I listedAlmost no alterations without listed building consent. Repair like-for-like. Highest restriction.
Grade II listed*Major alterations need consent. Internal works often restricted too.
Grade II listedMost listed UK properties. Exterior changes need consent; some internal protected.
Conservation areaPermitted development rights restricted. Article 4 directions may apply. Tree works need notice.
BothWorst case — listed AND in a conservation area means even repairs need approvals.
For investors, this affects:
  • Refurb scope — UPVC windows, render, extensions can be blocked
  • Build cost — Specialist contractors + consents add 30–60% to refurb budgets
  • Resale value — Premium for “tasteful restoration”, penalty for unsympathetic works
  • HMO conversion — Often blocked or heavily restricted

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Coverage

We have heritage flags pre-computed on 5,193 listed building records and 14,771 conservation area records across our 2.1M+ live property dataset. Coverage is best in England (where Historic England data is most complete) and growing in Scotland (Historic Environment Scotland) and Wales (Cadw).

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Use cases

  • Pre-offer due diligence — Don’t waste solicitor time on listed properties you can’t afford to refurb to spec
  • HMO sourcing — Filter out conservation areas where HMO conversion is blocked
  • Refurb cost modelling — Add a 30–60% premium to estimates when listed
  • Insurance underwriting — Listed buildings need specialist policies
  • Auction prep — Spot heritage restrictions before bidding
  • Planning — /api/v1/planning/{property_id}/heritage-status, /api/v1/planning/{property_id}/article4 for deeper checks
  • Demographics — Area context for heritage-rich districts
  • Properties — Filter live listings by is_listed_building / in_conservation_area