Internal wall insulation · Gwynedd
Internal wall insulation in Holyhead
We quote internal wall insulation for homes in Holyhead (LL65) and nearby Llangefni and Caernarfon, with guide prices online and a free survey to fix the price. Where a property in Holyhead is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Free survey in LL65 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Holyhead
Postcode, service and a phone number is all we need.
Part of every quote
- Insulated plasterboard, stud wall or breathable systems
- Needs careful detailing at floor joists, reveals and corners
- Keeps the outside of the house exactly as it is
- Loses roughly 50–100mm per insulated wall
Before we quote in Holyhead
We cover Holyhead and nearby Llangefni, Caernarfon and Bangor (Gwynedd). Holyhead sits around 22 miles from Bangor (Gwynedd). 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.
We plan internal insulation in Holyhead homes room by room so you keep the rest of the house usable.
- Postcode district
- LL65
- County or area
- Gwynedd
- Nation
- Wales
- Nearby
- Llangefni, Caernarfon, Bangor (Gwynedd), Llandudno
Planning and building control in Wales
Planning isn't usually involved with internal insulation. Building control is, once more than half of a wall is treated, and listed buildings need listed building consent.
What are the risks with internal insulation?
Insulating inside makes the masonry colder, so moisture risk rises. Weak points are where floor joists bear into the wall, window reveals and corners. A condensation risk check for the build-up, a continuous vapour control layer where specified, and returning insulation into reveals deal with most of it.
Internal wall insulation prices in Holyhead
| Item | Guide price | Notes |
|---|---|---|
| Insulated plasterboard, supplied and skimmed | £75–£110 per m²0% VAT | |
| Insulated stud wall | £90–£130 per m²0% VAT | |
| Typical bedroom, one external wall | £1,795–£2,9950% VAT | Including making good |
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.
How it works
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.
Internal wall insulation in Holyhead: questions
What happens to my radiators and sockets?
They're taken off and refitted on the new wall face. Electrical work is done by a qualified electrician.
How much room space will I lose?
Usually 50–100mm on each insulated wall, depending on the system.
Is internal insulation cheaper than external?
Per m² usually yes, but the cost of moving fittings and redecorating narrows the gap on whole-house jobs.
Do you cover Holyhead?
Yes — we survey and quote internal wall insulation in Holyhead (LL65) and nearby Llangefni, Caernarfon and Bangor (Gwynedd), with a fixed written price before any work starts.