External wall insulation in Wales

We take on external wall insulation for social landlords across Wales: housing associations, councils and supported housing providers in all 22 council areas, to the rules that apply in Wales.

Where in Wales do we carry out external wall insulation?

We cover every council area in Wales. Choose one to see who owns the social homes there and the local guide price.

External wall insulation in a social home

What is included?

Survey of walls, services and details before design
Moving services, downpipes, meters and fittings
Window reveal, cill, eaves and ground-level detailing
Scaffold, protection and resident liaison
Handover with system guarantee documents

Which rules apply in Wales?

PAS 2035:2023 sets the whole-house retrofit process (assessment, coordination, design, installation and evaluation), and PAS 2030:2023 covers installation. Most government-backed retrofit schemes require both, with TrustMark lodgement. We confirm in writing, before appointment, how each measure in your scope will meet those requirements.

What does it cost in Wales?

Our guide range for external wall insulation in Wales is £9,300–£17,200 per house. That is the UK range of £10,000–£18,500 (published figure) adjusted by a regional cost factor of 0.93 (VOA Rating Cost Guide 2026: 0.88–0.98); figures are before VAT where the source states it. Every job is priced after survey; specification, access and the condition of the homes will move the figure.

How do we deliver it?

Residents are told when their wall will be worked on and what will be moved. Satellite dishes, meters and pipes are relocated and restored as part of the scope.

Common questions

Which council areas in Wales do you cover for external wall insulation?

All 22: Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taf, Swansea, Torfaen, Vale of Glamorgan, Wrexham.

Can EWI be used on blocks of flats?

Often, yes. On blocks, the fire performance of the whole external wall is a design matter, and the rules on combustible materials depend on the building's height and use. We work to the design and do not substitute materials.

Does EWI cause damp?

Badly detailed EWI can. Most failures happen at window reveals, eaves and ground level, which is where we spend the most care.