Is it a radon Affected Area?
The official UKHSA–BGS Indicative Atlas, queried for your postcode's 1km square: the radon potential class, whether it is formally an Affected Area, and what that actually means for a purchase, answered here rather than behind another link.
What buyers should know about radon
Test, don't guess
The standard measurement is two detectors for three months, then a lab result, a validated pack costs around the price of a takeaway. Sellers in affected areas may already hold results; asking for them is free, and your conveyancer can raise it in enquiries.
Newer homes may be protected already
Since 1999, building regulations have required radon protection in new construction in affected areas: a gas-resistant membrane, sometimes a standby sump. Whether it was actually installed, and installed intact, is a construction question, the kind a survey addresses in areas like this.
Remediation works, and is not exotic
Where a test does come back high, a radon sump with a small fan, or positive input ventilation, typically brings levels down dramatically. It is a solvable defect with a known price, which makes it a negotiation item rather than a reason to walk away.
Basements and conversions deserve extra attention
Radon enters from the ground, so cellars, basement flats and ground-bearing floors see the highest concentrations. A basement conversion in an affected area should always prompt the question of what protection was designed in, and a lower-ground bedroom more so.
Buying in the Peaks, the Pennines or former mining country?
Radon, mining legacy and older stone construction travel together across much of our coverage area. A Level 3 survey reads the building in its geological context: what it is built on, what that does to it, and what to check before you commit.
Common questions
What is radon and why does it matter in a house purchase?
Radon is a naturally occurring radioactive gas from the trace uranium in rocks and soils. Outdoors it disperses; in a building it can accumulate, and long-term exposure is the UK’s second largest cause of lung cancer after smoking. It is invisible and odourless, which is why the only meaningful evidence is a measurement, not a viewing.
The map says my area is high — does the house have a radon problem?
Not necessarily. The Atlas maps the geology’s potential across each 1km square, and levels genuinely differ house to house with construction, floors and ventilation. A high-class square means one thing: test. A three-month detector pack costs little, and remediation where needed — a radon sump or positive ventilation — is well established and usually modest against the price of the house.
Does a survey include a radon test?
No survey can: the standard measurement takes three months with detectors in place. What a survey does in an affected area is flag the risk, check whether protective measures exist in newer construction, and recommend testing — and in higher-band areas your conveyancer may seek a retention or a radon bond pending results.
Which parts of the country are most affected?
The well-known concentrations are the granite areas of the South West, but parts of the Pennines, the Peak District and its surrounding towns, Northamptonshire’s ironstone belt and areas of Wales and Scotland map at elevated classes too. Limestone and former mining geology — common across our coverage area — is exactly where checking a specific postcode beats assumptions.