Condensation, mould and landlords, South Glamorgan
Condensation and mould ventilation fixes in South Glamorgan
We find why the house is wet and fix the ventilation, rather than painting over mould, across South Glamorgan.
- From £425 inc VAT per fan
- Free survey
In South Glamorgan homes, black mould usually comes down to the same few causes: weak fans, loft-vented ducts and no background ventilation.
We carry out condensation and mould ventilation fixes across South Glamorgan, including Barry, Penarth, Llantwit Major, Whitchurch and Rhiwbina. Prices use Wales rates. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
Condensation & mould in South Glamorgan at a glance
- Area
- South Glamorgan, Wales
- Towns listed
- 6, largest Cardiff
- Postcode districts
- CF11, CF62, CF63, CF10, CF11 and CF61
- 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 South Glamorgan
| 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
- Peeling paint or wallpaper in bathrooms
- Damp patches that dry out in summer and return in winter
- Someone in the home with asthma or allergies made worse by damp
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
- Recommend
- Fix
- Check back
Towns we cover in South Glamorgan
Questions about condensation and mould ventilation fixes in South Glamorgan
Which rules apply to ventilation in South Glamorgan?
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.
What is the main cause of condensation in a house?
The main cause is moisture from everyday living, such as showers, cooking and drying clothes, that is not being extracted, combined with cold surfaces where it condenses. Poor or failed extract fans are a very common cause.
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.
Which towns in South Glamorgan do you cover?
All of South Glamorgan, including Barry, Penarth, Llantwit Major, Whitchurch and Rhiwbina. If your town is not listed, send the postcode and we will confirm.
Are prices different in South Glamorgan?
Our guide prices are adjusted by region. In South Glamorgan 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.
We can log humidity in your South Glamorgan home afterwards so you can see the improvement.
Other services in South Glamorgan
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