Solid wall insulation · Gwynedd
Solid wall insulation in Bangor (Gwynedd)
From Bangor (Gwynedd) to Llangefni, we price solid wall insulation after a measured survey — no guesswork, and no work starts until the price is agreed in writing. For Bangor (Gwynedd) homeowners weighing external against internal insulation, the survey sets out both with prices.
- Free survey in LL57 and nearby
- Guide price from £75 per m² + scaffold, 0% VAT
- Fixed written price before work starts
Free survey in Bangor (Gwynedd)
Postcode, service and a phone number is all we need.
Included as standard
- 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
- In England and Wales, Building Regulations apply when more than half of a wall is treated
- Breathable options for stone and lime-mortared walls
Bangor (Gwynedd): walls, weather and approvals
Surveys in Bangor (Gwynedd) also cover the surrounding LL57 district and towns such as Llangefni and Caernarfon. North Wales has many solid stone and slate-built homes, Victorian seaside terraces and post-war council estates.
Parts of Gwynedd 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 solid-walled homes in Bangor (Gwynedd), we check wall thickness and age first to confirm there's no cavity to fill.
- Postcode district
- LL57
- County or area
- Gwynedd
- Nation
- Wales
- Nearby
- Llangefni, Caernarfon, Llandudno, Colwyn Bay
Permissions in Wales
Householder rules in Wales are similar to England's: in Bangor (Gwynedd), a similar-looking finish on a house is often permitted, but conservation areas, flats and listed buildings need permission or consent.
Welsh Building Regulations expect walls to be upgraded when a substantial area is renewed, and building control signs the work off.
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 Bangor (Gwynedd)
| 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
Enquiry
Send your postcode and a few details.
Measured survey
Walls, damp, eaves, cills and services recorded.
Written price
A fixed price with the specification attached.
Work and handover
Installed, inspected and documents handed over.
Solid wall insulation in Bangor (Gwynedd): questions
Can I do one wall at a time?
Yes. Many owners start with the coldest or most exposed elevation, often a gable end.
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.
Can I get a grant for solid wall insulation?
Some schemes cover it for eligible households — for example ECO4 until 31 December 2026, Home Energy Scotland's grant and loan, Wales' Warm Homes Nest and NI's Affordable Warmth Scheme. Each has its own eligibility and installer rules; see our grants guide.
Do you cover Bangor (Gwynedd)?
Yes — we survey and quote solid wall insulation in Bangor (Gwynedd, LL57) and nearby Llangefni, Caernarfon and Llandudno, with a fixed written price before any work starts.