4.95 out of 5 from 22 reviews on TrustATrader
Mould back again? Fix the air first.
Mouldex check the ventilation, fit the right fan, then treat the wall.
Here about radon? See radon testsAir first, wall second
Mould grows where damp air settles, so Mouldex fix it in this order.
- Step 1
Survey the air
A surveyor checks your ventilation against current regulations and finds where the wet air builds up.
“He quickly identified what was causing the problems with the ventilation system in my flat…”
Lisa Bell, 18th September 2019, TrustATrader
- Step 2
Fit the right ventilation
Continuous fans, vents or a loft unit, sized for your home and the people in it.
“Had 2 continuous fans and 2 passive vents as well as mould treated on the walls.”
Gina Chivers, 3rd June 2021, TrustATrader
- Step 3
Then treat the wall
The mould is sterilised, hidden spores treated, then a mould-resistant paint goes on.
“Craig.L came to my property to sort the mould out he done a amazing job informing me what he was doing…”
Chloe, 2nd October 2025, TrustATrader
- Step 4
Keep it dry
Fans cleaned and serviced, with a guarantee against the mould coming back (terms apply).
“Now we have dry windows, as opposed to pools and puddles of water on the window sill…”
Karolina Borucka, 25th June 2019, TrustATrader
Book a survey or radon test
Tell us what’s going on. The office will call to book a time.
- The office calls you backTo book a visit at a time that suits you.
- A surveyor or technician visitsMould survey, or radon detectors placed.
- You get options and a quoteThen you decide.
“They answered all my questions and were able to schedule in an appointment very quickly to suit me.”
Tim, 2nd August 2023, TrustATrader
Worried about radon? Test first.
You can’t see or smell it. A test is the only way to know.
- Test for 10 or 90 daysA technician places two detectors. A UKHSA-validated lab reads them.
- Know your numberGovernment advice is to act if a home averages 200 Bq/m³ or more.
- Bring it downIf it’s high, Mouldex fit a radon sump or improve the airflow.
“…enough, accessible, information to make an informed decision about addressing condensation and low-level radon issues at my new, but old, cottage.”
Jane Marriott, 28th November 2019, TrustATrader
Engineers from Cornwall to Gateshead
Head office in Bridgwater, Somerset, for homeowners, landlords and housing providers. Over 40,000 homes made healthier since 2019.
Depots: Redruth, Launceston, Ystrad Mynach, High Wycombe, Dunstable, Croydon, Maidstone, Cambridge, Coventry, the Midlands, Kendal, Gateshead.
Certified: TrustMark, NICEIC, UK Radon Association, Constructionline Gold, ISO 9001, Cyber Essentials.
Rated 4.95 out of 5 from 22 reviews on TrustATrader (checked 30 Oct 2026); reviews copied word for word, trimmed where you see “…”.