Radon in Devon: Risk, Testing & What to Do

46 Devon 46 districts Very High Average risk across 46 postcode districts

Devon has an average radon risk classification of Very High, based on BGS indicative atlas data covering 46 postcode districts. 31 of these districts are classified as High risk or above. Radon testing is recommended for all homes in areas with a High or above classification.

Why is Radon a Risk in Devon?

Devon is underlain by Carboniferous granite and uranium-bearing Devonian sedimentary rocks, which naturally release radon gas as they decay. The Dartmoor granite in particular is one of the highest radon-producing geological formations in England.

Highest-Risk Districts in Devon

All districts sorted by risk class (highest first). Click a district for detailed information.

District Risk Level % Homes at Risk
EX20 Highest >30%
EX35 Highest >30%
PL16 Highest >30%
PL19 Highest >30%
PL20 Highest >30%
PL21 Highest >30%
TQ10 Highest >30%
TQ13 Highest >30%
TQ8 Highest >30%
EX18 Highest 10–30%
EX19 Highest 10–30%
EX21 Highest 10–30%
EX31 Highest 10–30%
PL8 Highest 10–30%
TQ11 Highest 10–30%
TQ6 Highest 10–30%
TQ7 Highest 10–30%
TQ9 Highest 10–30%
EX16 Very High 5–10%
EX32 Very High 5–10%
EX33 Very High 5–10%
EX34 Very High 5–10%
EX36 Very High 5–10%
EX37 Very High 5–10%
EX38 Very High 5–10%
EX39 Very High 5–10%
TQ12 Very High 5–10%
EX1 High 3–5%
EX13 High 3–5%
EX22 High 3–5%
EX6 High 3–5%
EX10 Moderate 1–3%
EX17 Moderate 1–3%
EX2 Moderate 1–3%
EX7 Moderate 1–3%
TQ14 Moderate 1–3%
EX11 Low <1%
EX12 Low <1%
EX14 Low <1%
EX15 Low <1%
EX24 Low <1%
EX3 Low <1%
EX4 Low <1%
EX5 Low <1%
EX8 Low <1%
EX9 Low <1%

Questions People Ask About Radon in Devon

Is radon actually a problem in Devon? +
Devon has an average radon classification of Very High across 46 postcode districts. 31 districts are classified High or above — UKHSA recommends testing in these areas. Risk varies significantly street by street, so checking your specific postcode is important.
How do I get a radon test in Devon? +
The most widely used option is a postal test kit from UK Radon (ukradon.org) — run by the UKHSA. You post the detectors to your home, leave them for 90 days, then return them for lab analysis. The full kit including postage and lab report costs around £29. Results typically arrive within 3–4 weeks of return.
My surveyor mentioned radon in Devon — should I be worried? +
Not necessarily — a mention in a survey report means the area has a potential risk, not that your specific property does. Being flagged just means testing is recommended. A 90-day test costing £29 will give you a definitive answer. If the result is below 100 Bq/m³ you have nothing to worry about. If it's above 200 Bq/m³, mitigation options start from around £300.

Get a Radon Test for Devon

The only way to know your home's radon level is to test. Radon levels in Devon are classified as Very High — 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

We may earn a small commission from these links at no extra cost to you.

Check Your Postcode

Enter your postcode to see the exact radon risk for your specific area within Devon.

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