Solid wall insulation · County Londonderry
Solid wall insulation in Derry~Londonderry
Need solid wall insulation in Derry~Londonderry? Tell us about the property and we'll arrange a free survey and a written quote. For solid-walled homes in Derry~Londonderry, we check wall thickness and age first to confirm there's no cavity to fill.
- Free survey in BT48 and nearby
- Guide price from £75 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.
What's included
- Both can be done in stages, elevation by elevation or room by room
- Solid walls can lose heat roughly twice as fast as an insulated cavity wall
- Internal insulation suits single rooms or where the outside can't change
- External insulation keeps room sizes and treats cold bridges well
Before we quote in Derry~Londonderry
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.
On solid-walled houses in Derry~Londonderry, the gable or the most weather-exposed wall is often the place to start.
- Postcode district
- BT48
- County or area
- County Londonderry
- Nation
- Northern Ireland
- Nearby
- Strabane, Limavady, Coleraine, Omagh
Approvals in Northern Ireland
In Northern Ireland, permitted development is set by the 2015 Order; in Derry~Londonderry, changing a house's external appearance, and any work on flats or listed buildings, may need permission, so we check with the council.
Council building control in Northern Ireland checks insulation work of this kind; the quote says how the application is handled.
How can I tell if my walls are solid?
Measure the wall thickness at a window or door: about 225mm (9 inches) of brick usually means solid, while 260mm or more often means a cavity. On exposed brick, a pattern with bricks laid end-on (headers) every few courses points to solid construction. Stone walls are usually solid regardless of thickness. Age is a strong clue too — most homes built before the 1920s are solid-walled.
Solid wall insulation prices in Derry~Londonderry
| Item | Guide price | Notes |
|---|---|---|
| External (EWI) | £105–£210 per m²0% VAT | By board and finish |
| Internal (IWI) | £75–£130 per m²0% VAT | Plus making good |
| Survey and written recommendation | Free with a quote |
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.
Solid wall insulation in Derry~Londonderry: questions
Is solid wall insulation worth it?
For many solid-walled homes it's one of the biggest single improvements to comfort, because the walls are often the largest heat-loss area. Savings depend on the home and heating, so we don't promise a figure.
Does solid wall insulation cause condensation?
It can if detailed poorly, particularly internally. A condensation risk check for the proposed build-up and careful detailing at joists, reveals and corners avoid it.
Can I do one wall at a time?
Yes. Many owners start with the coldest or most exposed elevation, often a gable end.
Do you cover Derry~Londonderry?
Yes — we survey and quote solid wall insulation in Derry~Londonderry (BT48) and nearby Strabane, Limavady and Coleraine, with a fixed written price before any work starts.