Stay Warm.
Save Money.
Live Better.
Expert insulation for homes & businesses across London and South-East England
Our work
A selection of completed insulation projects across London and South-East England.
Project photos coming soon
What our customers say
Trusted by homeowners and businesses across London and the South East
Outstanding job
“SWI undertook both some Internal insulation and external insulation, and even managed to build a porch for us. The work was carried out quickly, efficiently, and to a very high standard. The team were polite, communication was fantastic throughout, and they always tidied up and left everything tidy at the end of each day. I wouldn't hesitate to recommend this company.”
Phil Wilcock
KT2 5NW
Very professional
“Very professional, yet very kind. External insulation is only worth it if carried out properly and professionally and that is what SWI provides. Their workers are very polite and pleasant to have around, they do clean after themselves properly, which cannot be said about just any company.”
Marie Dominique Scholtes
TW12 2TJ
Highly recommended
“I could not recommend Stay Warm Insulation enough. They carried out the work in a timely fashion and delivered to a very high standard. The internal wall insulation solution they install is of excellent specification and they went above and beyond to fulfil my requests.”
Lukasz Zielinski
WD19 4FJ
Materials we use
We specialise in External Wall, Internal Wall, Loft, Roof and Floor insulation. Select an area below to see the materials we use for each.
EPS EWI Boards
Expanded polystyreneThe most widely used EWI board. Moisture-resistant, lightweight, and cost-effective. Available in a wide range of thicknesses for flexible specification.
U-value range
0.15 – 0.45 W/m²K
Thickness
50 – 180 mm
Material selection depends on your property type, wall construction, and project goals. We will advise the right specification during your survey. Request a callback →
About Stay Warm Insulation Ltd
Expert insulation specialists serving London and South-East England since 2017
Founded in 2017
Stay Warm Insulation Ltd was founded by building expert David Couto (20+ years experience) and entrepreneur Imer Ibishi, driven by the growing importance of energy efficiency and sustainability.
Expert specialisation
We exclusively specialise in high-performance External Wall Insulation, Internal Wall Insulation, Loft Insulation and Floor Insulation for both domestic and commercial properties.
Certified and trusted
We are PAS2030-19 and TrustMark licensed and certified, ensuring high standards of workmanship and compliance with UK building regulations.
Frequently Asked Questions
Contact us
Leave your details and we will call you back to discuss insulation options, timelines, and funding where applicable.
Request a free callback
Speak with our insulation specialists about your property, savings, and available funding routes.
Ready to Transform Your Property?
Whether you want to explore your insulation options, modernise or sustainably improve your property — get in touch today
Get your expert quotePAS2030-19 & TrustMark Certified • 20+ Years Experience • London & South-East England