Condensation and mould ventilation fixes in Gwent

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

If you are anywhere in Gwent, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Blackwood, Newport, Cwmbran, Pontypool and Ebbw Vale.

Condensation & mould in Gwent at a glance

Area: Gwent, Wales
Towns listed: 17, largest Newport
Postcode districts: CF82, CF45, CF46, NP16, NP26 and NP4
Price region: Wales
Survey: Free survey (UK mainland)

What the work involves

Mould needs that damp surface to grow. Ventilation is usually the biggest part of the cure, but not the only part. Heating patterns, insulation gaps and cold bridges matter too, and some damp is not condensation at all: leaks, penetrating damp and rising damp need different trades.

Survey and findings

Humidity and surface readings, existing fans flow-tested, and a written list of causes and fixes.

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.

Guide prices in Gwent

Condensation and mould ventilation fixes guide prices in Gwent
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

Someone in the home with asthma or allergies made worse by damp
Black mould on window reveals, ceilings or behind furniture
Water running down windows on cold mornings

Rules in Wales

In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. In Wales, damp and mould is one of the matters that decides whether a rented home is fit for human habitation.

How the job runs

Survey
Find the cause
Recommend
Fix
Check back

Towns we cover in Gwent

Questions about condensation and mould ventilation fixes in Gwent

Are prices different in Gwent?

Our guide prices are adjusted by region. In Gwent we use Wales rates, so new ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) is typically £425 to £700 inc VAT per fan.

Is PIV or MVHR better for condensation?

For most existing homes with general condensation, PIV plus good extract fans is the most cost-effective fix. MVHR suits airtight, well-insulated homes and full renovations.

How much does a condensation survey cost?

A ventilation survey with written findings costs £125 to £225 including VAT. If we are surveying for an installation we quote for, the survey is free.

Is the survey free in Gwent?

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.

Which rules apply to ventilation in Gwent?

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.

Ask for a Gwent visit and we will test your existing fans before recommending anything.