Internal wall insulation · South Glamorgan
Internal wall insulation in Barry
From Barry to Penarth, we price internal wall insulation after a measured survey — no guesswork, and no work starts until the price is agreed in writing. Where a property in Barry is in a conservation area or the front elevation must stay unchanged, internal insulation is often the practical route.
- Free survey in CF63 and nearby
- Guide price from £75 per m² 0% VAT
- Fixed written price before work starts
Free survey in Barry
Postcode, service and a phone number is all we need.
What's included
- Keeps the outside of the house exactly as it is
- Insulated plasterboard, stud wall or breathable systems
- Can be done one room at a time during a renovation
- Loses roughly 50–100mm per insulated wall
Before we quote in Barry
As well as Barry itself, we quote in Penarth, Cardiff and Caerphilly. Barry sits around 7 miles from Cardiff. South Wales has long runs of solid-wall valley terraces, Victorian and Edwardian town housing and post-war council estates.
Exposure to wind-driven rain varies across South Glamorgan: sheltered town streets fare better than walls on high ground or facing the prevailing weather, and the render, beads and cill details are chosen with that in mind.
For terraced homes in Barry with attractive brick fronts, one approach is to insulate the front internally and the rear externally.
- Postcode district
- CF63
- County or area
- South Glamorgan
- Nation
- Wales
- Nearby
- Penarth, Cardiff, Caerphilly, Pontypridd
Permissions in Wales
Internal insulation rarely needs planning permission, but in England and Wales insulating or replastering more than half of a wall's area involves building control, and listed buildings need consent for internal changes that affect their character.
What are the options for internal insulation?
- Insulated plasterboard — PIR or phenolic foam bonded to plasterboard, fixed to the wall and skimmed. Thinnest option.
- Insulated stud wall — a timber or metal frame filled with insulation, with a vapour control layer and plasterboard. Takes more space but runs services easily.
- Wood fibre and lime — breathable boards finished in lime plaster, for older walls that need to manage moisture.
Internal wall insulation prices in Barry
| 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
Get a guide price
Try the online quote tool for a ballpark figure.
Book the survey
A visit at a time that suits you.
Agree the quote
Nothing starts until you've signed the written price.
We do the work
Planned around weather, with you kept informed.
Internal wall insulation in Barry: questions
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.
Can I stay in the house?
Yes, but each room is out of use while it's worked on, typically 3–5 days.
Do you cover Barry?
Yes — we survey and quote internal wall insulation in Barry (CF63) and nearby Penarth, Cardiff and Caerphilly, with a fixed written price before any work starts.