Condensation and mould ventilation fixes in Clwyd

In Clwyd homes, black mould usually comes down to the same few causes: weak fans, loft-vented ducts and no background ventilation.

Clwyd has every kind of building, from old terraces to new estates and business parks, and every job is designed around the building in front of us, not a standard kit.

Condensation & mould in Clwyd at a glance

Area: Clwyd, Wales
Towns listed: 13, largest Wrexham
Postcode districts: CH6, LL11, LL12, CH5, CH7 and CH4
Price region: Wales
Survey: Free survey (UK mainland)

What the work involves

A typical family puts several litres of water into the air every day. If extract fans are weak, ducted into the loft or switched off, and windows stay shut in winter, that moisture settles on the coldest surfaces: window reveals, external corners, behind wardrobes and on bathroom ceilings. Mould needs that damp surface to grow.

Fan upgrades

Weak or loft-vented fans replaced and ducted outside, with humidity control.

Whole-home ventilation

PIV, continuous extract or MVHR where moisture is spread through the house.

Mould treatment advice

How to clean and treat affected areas once the cause is fixed.

Guide prices in Clwyd

Condensation and mould ventilation fixes guide prices in Clwyd
Work	Guide price
New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan)	£425–£700 inc VAT
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£750–£1,325 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£330–£575 inc VAT
Condensation and mould ventilation survey with written findings (per home)	£120–£215 inc VAT

These ranges use our Wales rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

Common reasons people call

Black mould on window reveals, ceilings or behind furniture
Water running down windows on cold mornings
Musty smell in bedrooms or wardrobes

Rules in Wales

In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. Rented homes in Wales must be fit for human habitation under the Renting Homes (Wales) Act, and damp and mould is one of the matters considered.

How the job runs

Survey
Find the cause
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Fix
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Towns we cover in Clwyd

Questions about condensation and mould ventilation fixes in Clwyd

Is the survey free in Clwyd?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

Will a dehumidifier fix condensation?

A dehumidifier helps in one room but treats the symptom. Fixing the extract in the wet rooms, and adding whole-home ventilation where needed, removes moisture before it spreads.

Is black mould dangerous?

Damp and mould can affect health, particularly for people with asthma, allergies, weak immune systems, children and older people, according to NHS and government guidance. It should be dealt with rather than lived with.

Which rules apply to ventilation in Clwyd?

In Wales, the Welsh Government's own Approved Document F (2022 edition) applies to ventilation in homes, with a new edition taking effect on 4 March 2027. Rented homes must be fit for human habitation under the Renting Homes (Wales) Act 2016, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Which towns in Clwyd do you cover?

All of Clwyd, including Rhyl, Hawarden, Rhosllannerchrugog, Wrexham and Buckley. If your town is not listed, send the postcode and we will confirm.

Book a condensation survey in Clwyd and get a written list of causes and fixes.