Cwmbran, Gwent
External Wall Insulation in Cwmbran
EWI systems that insulate solid walls externally and finish them in a warranted render topcoat.
External Wall Insulation in Cwmbran is work we take on regularly, and the Gwent housing stock is a big part of why.
Most of what we see around Cwmbran reflects the wider Gwent pattern — valley terraces, stone cottages and postwar estate housing, and damp in solid-wall valley terraces and failed cement render.
The area sees high rainfall with sheltered valley conditions, which is the single biggest factor in how long any render lasts here. The valleys hold moisture and see limited sun on north-facing slopes, so algae and persistent damp are more common here than the rainfall alone would suggest.
When external wall insulation is the right call. Choose EWI on solid-wall, no-fines or non-traditional construction where you want a genuine thermal upgrade rather than just a new finish.
Guide price in Cwmbran
| Guide price | £135–£210 per m² |
|---|---|
| Applied thickness | 50-150mm insulation plus render system |
| Guarantee | 25 years |
Indicative only. The guide-price tool gives a range for your property; the survey gives the fixed price.
What the job includes
- EPS, mineral wool and phenolic boards
- 50mm to 150mm thicknesses
- Mechanical and adhesive fixing
- Reinforced basecoat with mesh
- Silicone or acrylic topcoat
- Window and door reveal detailing
You get a written, itemised quotation after the survey, with the specification named so you can compare like for like.
Also covering near Cwmbran
External Wall Insulation in Cwmbran
Tell us about the property and we will call you back to arrange a survey.
What happens next
Four steps from enquiry to finished wall
Free survey
We visit, test the substrate, measure up and identify what caused any existing failure.
Written quote
An itemised fixed price with the system named, materials specified and scaffold included.
Booked in
An agreed start date, scaffold arranged, and a clear run of days set aside for your job.
Finished and guaranteed
Site cleared, scaffold struck, guarantee documents and system warranty issued.
FAQs
External Wall Insulation in Cwmbran
Do I need planning permission for EWI?
Often not on a standard house, but you will if it is listed, in a conservation area, or if it alters the appearance significantly. We advise before starting.
How much does rendering cost?
It is priced by the square metre and depends on the system, the condition of the walls and access. Our guide-price tool gives an indicative range in about a minute, and the survey turns that into a fixed written quote.
Do you offer a guarantee?
Yes. Every job carries our workmanship guarantee, and where a full manufacturer-specified system is installed you also get the system warranty on top.
What time of year is best for rendering?
Spring through autumn is ideal. Render should not be applied in frost or in very hot direct sun, so winter work needs protection and settled conditions.
Can you render over existing render?
Sometimes, if the existing coat is completely sound and well-bonded. We hammer-test it first. Anything hollow has to come off, because covering failure just hides it.
Free survey in Cwmbran
We will confirm whether external wall insulation suits your walls before quoting a price.