Mineral wool EWI · County Londonderry
Mineral wool external wall insulation in Derry~Londonderry
Quotes for mineral wool external wall insulation in Derry~Londonderry list the system, the detailing and the VAT position in writing, so you know exactly what's included. On blocks and taller buildings in Derry~Londonderry, mineral wool is the default because of the fire guidance for external walls.
- Free survey in BT48 and nearby
- Guide price from £125 per m² + scaffold, 0% VAT
- Fixed written price before work starts
Free survey in Derry~Londonderry
Postcode, service and a phone number is all we need.
Included as standard
- Better sound reduction than foam boards
- Heavier than EPS, so more fixings and careful handling
- Vapour-open, so moisture in solid walls can dry outwards
- Used on blocks of flats and buildings with storeys above 11m
Derry~Londonderry: walls, weather and approvals
Surveys in Derry~Londonderry also cover the surrounding BT48 district and towns such as Strabane and Limavady. Northern Ireland has many rendered and pebble-dashed homes, older solid-walled rural houses, and estates built by the Housing Executive.
Parts of County Londonderry fall in the higher wind-driven rain exposure bands, especially coastal and upland sites, so render specification, movement joints and detailing at cills, verges and the base of the wall matter more than usual.
For homes in Derry~Londonderry near busy roads, mineral wool's sound reduction can be a reason to choose it.
- Postcode district
- BT48
- County or area
- County Londonderry
- Nation
- Northern Ireland
- Nearby
- Strabane, Limavady, Coleraine, Omagh
Planning and building control in Northern Ireland
Before quoting in Derry~Londonderry, we check whether the property is listed or in a conservation area, which changes what needs planning permission in Northern Ireland.
Council building control in Northern Ireland checks insulation work of this kind; the quote says how the application is handled.
On taller buildings in Northern Ireland we specify non-combustible mineral wool systems and confirm the classification with building control, in line with Technical Booklet E.
Why choose mineral wool over EPS?
Two reasons come up most: fire and moisture. Mineral wool doesn't burn, which is why guidance for taller residential buildings points to non-combustible external wall materials. It is also vapour-open, so a solid wall that holds some moisture can keep drying outwards through the insulation and render.
The trade-offs are weight and cost. Slabs are denser, need more fixings and take longer to install, so the price per m² is higher than EPS.
Mineral wool external wall insulation prices in Derry~Londonderry
| Item | Guide price | Notes |
|---|---|---|
| Mineral wool + mineral or silicone render | £125–£170 per m²0% VAT | Excluding scaffold |
| Mineral wool + brick slip | £195–£260 per m²0% VAT | Heavier slip systems need extra fixings |
| Three-bed semi, full house | £11,800–£20,2000% VAT | 80–100 m² of wall, including scaffold |
Confirmed by a fixed written quote after survey. 0% VAT: installing insulation in a home is zero-rated until 31 March 2027, so these figures are the total; 5% applies from 1 April 2027.
What happens next
Tell us about the property
Use the quote tool or form, or call. Photos help.
Free survey
We measure, check the walls and confirm approvals.
Fixed written quote
System, details, access, exclusions and VAT in writing.
Installation
Scheduled for suitable weather, with a clear programme.
Mineral wool EWI in Derry~Londonderry: questions
Is mineral wool better than EPS?
Not always better — different. Mineral wool wins on fire performance, breathability and acoustics; EPS wins on cost, weight and thinner boards for the same U-value. The wall, the building height and your priorities decide it.
Does mineral wool get wet?
It is water-repellent and protected by the render system. Like any insulation it must not be left exposed to rain during installation, so boards are covered and work stops in wet weather.
Can mineral wool EWI have a brick finish?
Yes. Brick slips can be bonded over mineral wool systems designed for them, with additional fixings for the extra weight.
Do you cover Derry~Londonderry?
Yes — we survey and quote mineral wool external wall insulation in Derry~Londonderry (BT48) and nearby Strabane, Limavady and Coleraine, with a fixed written price before any work starts.