PRICE GUIDE · TRADES & CONSTRUCTION · 2026–2027
Radon Testing & Mitigation cost in the UK
£40–£2,000 per job. Typically £800.
Radon work in UK homes runs from about £40 for a test to £2,000 for a sump, with £800 typical once a fix is needed. A postal test is cheap; positive-pressure ventilation, under-floor ventilation and a fan-assisted sump cost progressively more, depending on the floor and how high the reading is.
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HOW MUCH IT COSTS
How much does radon testing & mitigation cost in the UK?
| Low end | £40 | a three-month postal test |
|---|---|---|
| Typical | £800 | what most people pay |
| High end | £2,000 | a fan-assisted sump through a solid floor |
Locufy guide prices for 2026–2027. Updated 2026. A national range, not a quote — enter your town above for real prices from the builders and trades near you.
What moves the price
- Test or remediation — a three-month radon test costs a fraction of installing a radon sump or ventilation
- Radon level found — readings well above the Action Level usually need a fan-assisted sump rather than ventilation
- Floor construction — solid concrete floors suit a sump, while suspended timber floors may need under-floor ventilation
- Size and layout of the home — larger footprints or several extensions can need more than one radon sump
- Retest after the work — a follow-up radon test is needed to prove the fix has worked
- Where you live — parts of the South West, Wales, Derbyshire and Northamptonshire are radon Affected Areas
Building and repair prices in the UK are up 6% over five years (ONS Consumer Price Inflation, Services for maintenance and repair, to 2026 August). Five years ago a typical radon testing & mitigation would have cost about £330 — an estimate from today's guide price and that index, not a recorded price. Source: ONS MM23 D7DO →
WHAT YOU GET
What a radon testing & mitigation booking includes
Takes: Three months for a reliable test; one to two days to fit a radon sump. Not included: Making good floors and decoration after a sump is dug, and running power to a radon fan, are often priced separately — see the related guides below.
WHAT PEOPLE BOOK
Common radon testing and remediation jobs
KNOW THE PRICE? NOW SEE THE REAL ONES
Radon Testing & Mitigation near you, with prices shown
The builders and trades that cover your area, nearest first, each with their price and one score from every review. No account needed to look.
Or post the job free and let them come to you.
How to pay less
- Start with the UKHSA radon map and a three-month test before paying for any radon remediation
- Try clearing blocked airbricks and improving under-floor ventilation first where radon readings are only just high
- Ask for a radon sump to be fitted during other building work, when the floor is already open
Before you book
- Use a three-month radon test for a reliable answer; short tests only give a rough reading
- The UK Action Level for radon in homes is 200 becquerels per cubic metre of air
- Ask the radon installer to guarantee a retest after the sump or ventilation is fitted
- New homes in Affected Areas may already have a radon membrane under the floor, so check before digging
Radon Testing & Mitigation cost: questions people ask
From about £40 for a test to £2,000 for a fan-assisted sump, with £800 typical once remediation is needed. A postal test is the cheapest part; a sump through a solid floor is the dearest.
The standard household test runs for three months, because radon levels change with the seasons. A sump is usually fitted in one or two days.
Check the UKHSA radon map by address. Affected Areas cover parts of the South West, Wales, the Peak District and other areas with granite or limestone ground.
A fan-assisted sump is the most effective fix and often cuts levels sharply, but only a retest proves it. Ventilation suits homes with lower readings.
Making good floors and decoration after a sump, and wiring for the fan, are often separate. Ask whether the retest is included in the price.
They are Locufy guide prices for the UK, read from published UK radon testing and remediation costs — a national range, not a quote. The reading and your floor type decide the cost.