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Radon Risk

Radon gas potential for any UK property, sourced from the British Geological Survey's national 1km grid dataset. Six-class rating from Very Low to Very High — the same data used by PHE for public health guidance, available in a single API call.

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Risk classification at a glance

BGS maps England and Wales into six radon potential classes based on the percentage of homes in each 1km grid square likely to exceed the Action Level of 200 Bq/m³.

UPRN 100021438816 — Radon Potential

Cornwall TR1 2AB — elevated radon area

risks/radon

Radon Potential High

BGS Class

Homes above Action Level

10–30%

10-30% of homes in this area exceed 200 Bq/m³ — testing and mitigation recommended.

BGS Class scale

1 Very low <1% of homes above Action Level

2 Low 1–3% of homes above Action Level

3 Moderate 3–5% of homes above Action Level

4 Medium 5–10% of homes above Action Level

5 High 10–30% of homes above Action Level

6 Very high >30% of homes above Action Level

Response fields

Each radon result includes the BGS class number, a human-readable label, and the percentage band for homes in the area exceeding the Action Level.

risk_type string Always "radon"

label string Very low / Low / Moderate / Medium / High / Very high

score integer BGS class 1–6 (1 = very low risk)

score_unit string Always "class"

intersects boolean True — grid cell covers property location

distance_m integer 0 — grid cell at property location

search_radius_m integer 1000 — BGS uses a 1km grid

radius_description string "Within 1km grid"

properties.description string Human-readable % band for area

Built for

Conveyancing tools

Radon disclosure is required in affected areas. Add it to property reports automatically — no manual lookup, no specialist search fees.

Mortgage underwriting

Flag high-radon properties during the application stage. Screen portfolios in bulk — Class 5/6 properties warrant radon testing conditions.

Property search platforms

Show buyers the radon potential alongside flood risk and EPC. Particularly relevant for rural properties in South West England, Wales, and parts of Derbyshire.

API example

GET /api/risks/radon/?uprn= cURL

curl "https://api.homedata.co.uk/api/risks/radon/?uprn=100021438816" \
  -H "Authorization: Api-Key YOUR_KEY"

Response 200 OK

{
  "risk_type": "radon",
  "uprn": 100021438816,
  "location": {"lat": 50.26, "lon": -5.05},
  "results": [
    {
      "risk_type": "radon",
      "label": "High",
      "score": 5,
      "score_unit": "class",
      "intersects": true,
      "distance_m": 0,
      "search_radius_m": 1000,
      "count": 1,
      "radius_description": "Within 1km grid",
      "properties": {
        "description": "10-30% of homes in this area
          exceed the Action Level"
      }
    }
  ]
}

Full endpoint reference → ← Back to Environmental Risk