11/05/2026
EWI (External Wall Insulation) doesn’t just improve insulation — it completely transforms the appearance of your property. You can choose from several different finishes depending on the style you want and your budget.
Popular EWI Finishes
Silicone Render
Modern, smooth finish with a clean contemporary look. It’s breathable, flexible, self-cleaning and resistant to cracking. Available in many colours and very low maintenance.
Average cost for a 3-bedroom house: £9,000–£14,000.
Acrylic Render
A coloured decorative finish that gives a vibrant appearance and good durability. Slightly less breathable than silicone but often cheaper.
Average cost for a 3-bedroom house: £8,000–£12,000.
Monocouche Render
A through-coloured one-coat render with a textured finish. Popular for modern homes because it doesn’t require painting.
Average cost for a 3-bedroom house: £7,000–£10,000.
Traditional Sand & Cement Render
A more traditional finish that can be painted any colour. Lower upfront cost but requires more maintenance over time.
Average cost for a 3-bedroom house: £5,000–£8,000.
Brick Slip Finish
Gives the appearance of real brickwork while still benefiting from EWI insulation underneath. Ideal for keeping a traditional brick-house look.
Average cost for a 3-bedroom house: £12,000–£18,000+ depending on brick type and coverage.
Pebbledash / Roughcast Finish
A textured, highly durable finish often used on older properties. Good weather protection and low maintenance.
Average cost for a 3-bedroom house: £7,000–£11,000.
What Affects the Price?
Property size and access
Scaffold requirements
Existing wall condition
Insulation thickness
Finish selected
Location in the UK (London prices are usually higher)
Most homeowners choose silicone render because it offers the best mix of appearance, durability and low maintenance.
