Derry, County Londonderry
Condensation and mould ventilation fixes in Derry
We find why the house is wet and fix the ventilation, rather than painting over mould. Covering Derry and BT47 and BT48.
- From £410 inc VAT per fan
- By arrangement
For tenants, landlords and homeowners in Derry, the common question is why the mould keeps coming back.
Customers in Derry can get a guide price online in a couple of minutes. It uses Northern Ireland rates, which is what we would charge for the same job anywhere in County Londonderry. Work here is by arrangement, with travel quoted in writing first.
Condensation and mould fixes in Derry at a glance
- Town
- Derry, County Londonderry
- Postcode districts
- BT47 and BT48
- Nearby
- Strabane (14 miles) and Limavady (15 miles)
- Price region
- Northern Ireland
- Survey
- By arrangement, travel quoted first
Condensation and mould fixes for Derry homes
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.
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 Derry
| Work | Guide price |
|---|---|
| New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan) | £410–£675 inc VAT |
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £725–£1,275 inc VAT |
| Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan) | £315–£550 inc VAT |
These ranges use our Northern Ireland rates. Prices include VAT at 20%. You get a fixed written price before any work is booked. Travel is quoted separately for this area.
When to get it looked at
- 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 that apply in Northern Ireland
In Northern Ireland, ventilation is covered by the Building Regulations (Northern Ireland) and Technical Booklet K. Rented homes in Northern Ireland must meet fitness and repair duties, which include dealing with serious damp.
Questions from Derry
What is the price of a condensation fix in Derry?
Guide prices for Derry use Northern Ireland rates: new ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) is typically £410 to £675 inc VAT per fan. We confirm a fixed price in writing before any work starts.
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.
Is the survey free in Derry?
Visits here are by arrangement. Because of the ferry or long travel involved, we quote travel separately and in writing before you commit, and we can often combine visits to keep the cost down.
How do I get a price for a condensation fix in Derry?
Use the guide price tool, the form on this page, live chat, WhatsApp or call 0800 088 6341. A postcode and a couple of photos help us give you a useful answer first time.
Condensation and mould fixes near Derry
More services in Derry
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