Radon Risk in East Sussex

Last reviewed: March 2026 · Data: BGS Indicative Atlas v3.

30 postcode districts · 7 classified High or above · Average risk class: 1.9 / 5

Radon is a naturally occurring radioactive gas and the second largest cause of lung cancer in the UK. Risk varies significantly by location — the areas below show how East Sussex compares. 7 districts in East Sussex are classified High risk or above — testing is strongly recommended in these areas.

All Districts in East Sussex

District Risk Level % Homes
BN10 Highest 10–30%
BN20 Highest 10–30%
BN21 Highest 10–30%
BN25 Highest 10–30%
BN7 Highest 10–30%
BN9 Highest 10–30%
BN26 Very High 5–10%
BN23 Moderate 1–3%
BN22 Low <1%
BN24 Low <1%
BN27 Low <1%
BN8 Low <1%
RH18 Low <1%
TN19 Low <1%
TN20 Low <1%
TN21 Low <1%
TN22 Low <1%
TN31 Low <1%
TN32 Low <1%
TN33 Low <1%
TN34 Low <1%
TN35 Low <1%
TN36 Low <1%
TN37 Low <1%
TN38 Low <1%
TN39 Low <1%
TN40 Low <1%
TN5 Low <1%
TN6 Low <1%
TN7 Low <1%

Get a Radon Test for East Sussex

The only way to know your home's radon level is to test. Radon levels in East Sussex are classified as Moderate — a test takes 3 months and costs around £29.

UKRadon Postal Test Kit
From ~£29 · 3-month detector Airthings Corentium Home (Amazon UK)
~£99 · Digital · Ongoing monitoring

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