Is radon a problem in Cornwall?

Cornwall has an average radon risk classification of Very High across its 12 postcode districts, based on BGS indicative atlas data. 10 districts are classified High risk or above, where UKHSA recommends radon testing.

How do I check radon levels in my Cornwall home?

Use the free postcode lookup on radon.tips to see your district's risk classification. If your area is classified Moderate, High, or above, order a 90-day postal radon test kit from UK Radon (ukradon.org) — they cost around £29 and give an accurate average concentration for your home.

What is the radon action level in the UK?

The UK domestic radon action level is 200 Bq/m³ (Becquerels per cubic metre), set by UKHSA. If your home tests at or above this level, professional mitigation is recommended. The UK target level is 100 Bq/m³ — the level UKHSA considers optimally achievable.

Radon in Cornwall: Risk, Testing & What to Do

Very High Average risk across 12 postcode districts

Cornwall has an average radon risk classification of Very High, based on BGS indicative atlas data covering 12 postcode districts. 10 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 Cornwall?

Cornwall sits on the Cornubian granite batholith, a vast granite intrusion rich in uranium and thorium. As these minerals decay, they release radon gas into the soil and air. Cornwall consistently records some of the highest radon levels in the UK.

District Data

Individual district data for Cornwall will be available in a future update. Use the postcode search below to check your specific area.

Questions People Ask About Radon in Cornwall

Is radon actually a problem in Cornwall? +

Cornwall has an average radon classification of Very High across 12 postcode districts. 10 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 Cornwall? +

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 Cornwall — 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 Cornwall

The only way to know your home's radon level is to test. Radon levels in Cornwall 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

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Check Your Postcode

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