External Wall Insulation (EWI)
Want to improve your home's energy efficiency while upgrading the exterior look? External wall insulation (EWI) lets you do both — reducing heat loss and enhancing curb appeal in one project.
What Is EWI?
EWI is an insulated board system installed on the outside of your walls and finished with a protective render. It improves thermal efficiency, lowers heating bills, and creates a completely refreshed exterior look.
Benefits of EWI with Rendering
- ✅ Lower energy bills – retain more heat
- ✅ Warmer, quieter rooms – all year round
- ✅ Modern rendered appearance
- ✅ Can be paired with silicone or monocouche render
- ✅ Ideal for solid wall properties or older homes
Perfect for Retrofits and Renovations
EWI is ideal if:
- Your home has solid walls (no cavity)
- You want both insulation + rendering
- You're applying for government energy-efficiency grants (ask us)
Visual Results from Real Projects
View our work across Hertfordshire and Essex where EWI reduced energy bills by increasing thermal properties.
Get an EWI Quote Today
We'll assess your property and explain the best render pairing for your insulation — whether silicone for performance or monocouche for style.
Related Pages
Frequently Asked Questions
What is External Wall Insulation (EWI)?▼
EWI adds insulation boards to the outside of your walls and finishes them with render. It improves thermal performance and refreshes the exterior appearance.
What are the benefits of EWI?▼
EWI reduces heat loss, lowers energy bills, improves comfort, and protects walls from weather. It can be finished in silicone or monocouche render.
How much does EWI cost?▼
Typical EWI + render systems range from £80–£100 per m², depending on insulation thickness, access, and finish choice. A survey provides accurate pricing.