Llanelli, Dyfed
Condensation and mould ventilation fixes in Llanelli
We find why the house is wet and fix the ventilation, rather than painting over mould. Covering Llanelli and SA14, SA15 and SA16.
- From £425 inc VAT per fan
- Free survey

We survey Llanelli homes for condensation with meters, not guesswork, and explain what we find.
Llanelli is about 113 miles from our base in Great Barr, Birmingham. We book Llanelli visits by appointment and confirm the date in writing. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
Condensation and mould fixes in Llanelli at a glance
- Town
- Llanelli, Dyfed
- Postcode districts
- SA14, SA15 and SA16
- Nearby
- Gorseinon (5 miles), Swansea (10 miles) and Ammanford (11 miles)
- Price region
- Wales
- Survey
- Free survey (UK mainland)
Condensation and mould fixes for Llanelli homes
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.
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.
Guide prices in Llanelli
| 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 |
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 that apply in Wales
Wales has its own Part F ventilation guidance, published by the Welsh Government, and work is checked by building control. In Wales, damp and mould is one of the matters that decides whether a rented home is fit for human habitation.
Questions from Llanelli
Do you cover Llanelli and nearby?
Yes. We cover Llanelli and nearby places including Gorseinon, Swansea, Ammanford and Clydach. Send your postcode and we will confirm.
Can you tell if it is rising damp?
We can tell you when the pattern does not look like condensation, such as a tide mark low on a wall or damp that appears after rain, and point you to the right specialist.
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.
What is the price of a condensation fix in Llanelli?
Guide prices for Llanelli use Wales rates: 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 confirm a fixed price in writing before any work starts.
Is the survey free in Llanelli?
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.
Ask for a Llanelli visit and we will test your existing fans before recommending anything.
Condensation and mould fixes near Llanelli
More services in Llanelli
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.