Data catalogue/ Environmental risk/ Radon risk

Radon risk

Radon gas potential for a property in Great Britain, 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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Sample responseJSON

{
  "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"
      }
    }
  ]
}

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.

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

UPRN 100021438816: Radon PotentialCornwall TR1 2AB: elevated radon area

Radon Potential High

Homes above Action Level

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.

Field	Type	What it is
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.

The API

API example

GET /risks/radon/?uprn= cURL
Response 200 OK

Read the docs →

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

Full endpoint reference → · ← Back to Environmental Risk

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