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BeforeAfter
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External wall insulation
A Complete Wrap for Your Home
Warmth, Weather Protection, and a Brand New Look
External wall insulation (sometimes called EWI, render insulation, or insulated cladding) is exactly what it sounds like: a thick layer of insulation fitted to the outside of your home, then finished with a beautiful render coat in the colour of your choice.
Think of it like a well-made winter coat for your house. Once it's on, the walls inside stay warm, the heating works less hard, your bills drop — and from the kerb, your home looks completely transformed.
- Solid wall homes built before 1930 (no cavity to fill)
- Older properties with tired-looking pebbledash or weathered brickwork
- Anyone with cold walls that feel like ice in winter
- Homes with high heating bills that never seem to feel warm enough
The Benefits
Three Big Reasons Our Customers Choose External Wall Insulation
Reason One
Save £400+ a Year on Energy Bills
About 35% of the heat in an uninsulated home escapes through the walls. External wall insulation stops that in its tracks. Most of our customers see their heating bills drop by £400 to £600 a year — and with energy prices the way they are, those savings add up fast.
A typical Rockwarm installation pays for itself through energy savings, and then keeps saving you money for decades after.
Reason Two
A Beautiful New Finish
(Without the mess of a re-build)This is the bit that genuinely surprises people. They come to us thinking about energy bills, and they end up just as excited about how their home looks afterwards.
You choose:
- The Colour
- Whites, creams, soft greys, modern charcoals, classic terracottas
- The Finish
- Smooth, textured, or scraped (we'll talk you through what suits your property)
- The Render System
- K Rend, Weber, Parex, and other premium systems we trust
Tired pebbledash, mismatched extensions, weathered brick — all gone. Your home looks like a brand new build when we're done.
Reason Three
40 Years of Doing This Properly
We've been installing external wall insulation since 1985. That's not a marketing line — it's four decades of figuring out what works, which materials last, and how to get the details right so your finish still looks great in 25 years.
We're TrustMark certified, every job comes with a lifetime guarantee, and we've got a 4.9-star rating from over 400 customers across the Midlands. Most of our work comes from neighbours of people we've already done.
External Wall Insulation
See the difference a wrap makes.
Recent before-and-after projects from Rockwarm installations across the Midlands.
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BeforeAfter
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How it works
The Process
Simple, Honest, No Surprises. We've kept this as straightforward as we can.
Here's exactly what happens from your first call to the finished job:
Free Home Survey
You tell us a bit about your property, we book a convenient time, and one of our experienced surveyors visits. They'll measure up, check the walls, talk you through your options, and answer every question you've got. No charge, no pressure, no hard sell.
Written Quote
Within a few days of the survey, you get a detailed written quote. We break down exactly what's included, what materials we'll use, the colour and finish you've chosen, and a clear price. No grant inflation, no hidden extras.
Installation (2–3 Weeks)
Once you give us the go-ahead, we typically start within a few weeks. The installation itself takes around 2–3 weeks depending on your property size. You stay in your home throughout — there's no need to move out.
Aftercare
We're always at the end of the phone if you ever need us again. Many of our customers have had us back years later for cavity wall insulation, loft insulation, or just to ask advice. That's how we like it.
Why Rockwarm
Why Families Across the Midlands Have Trusted Us Since 1985
We're not a national franchise, we're not a sales operation, and we don't subcontract the work out. Rockwarm is a family business based in Nuneaton, and the team who quotes your job is the same team who installs it.
Here's what that means for you:
40 years of doing one thing properly
We started installing insulation in 1985 and we've never done anything else. Every detail has been refined through hundreds of jobs.
No pressure sales
Our surveyor will give you honest advice and leave you to decide. No follow-up phone calls hassling you.
Our own installers
Same trained team, every job. No subcontractors.
Work Guarantee
On every installation. In writing.
TrustMark certified.
Government-endorsed quality standard.
Reviews
Trusted by homeowners
across the Midlands
Genuine feedback from Rockwarm customers.
Read all reviewsReviews
Trusted by homeowners
across the Midlands
Genuine feedback from Rockwarm customers.
Read all reviews“Best thing I have ever done”
We have recently moved into a 1920s property and with an older property it came with cracked brickwork leading to cold drafts into the house causing condensation running down the windows. Best thing I have ever done!!!
Y
Verified Customer
Yell
“My house looks like a new build”
My house looks like a new build. I have so many compliments from people walking past. We decided to only have the top half done to keep the character of the house and it looks fantastic. Very happy.
Y
Verified Customer
Yell
“From start to finish, totally professional”
From start to finish this company have been totally professional. The crews that were on site turned up when they said they would and were very polite, clean and tidy. Just waiting now for the scaffold to come down so that I can admire all their hard work. Would recommend them to anyone.
Y
Verified Customer
Yell
“The walls are no longer stone cold”
In regards to insulation you will be happy to hear the walls are not stone cold on the inside anymore and they actually feel warm. We don't have to keep heaters on all night during cold months anymore.
T
Verified Customer
Trustpilot
“Rockwarm”
The team from all the office staff to the workers were all excellent. Tracy and Sarah were excellent at all times, kept us informed at all times regarding what works will be carried out on what day. all work was carried out to a high standard. site was clean and tidy after each days work, the job looked great when completed. I would highly recommend to anyone.
A
AhmedP-31
Yell
“Excellent Service from Start to Finish”
I recently had External Wall Insulation installed by Rockwarm Insulation Ltd, and I couldn’t be happier with the whole experience. From the very first enquiry with Charlotte and Jonathan, their communication was outstanding — clear, prompt, and genuinely helpful. Every step was explained in a way that made the process completely hassle-free - thanks to Sara, Tracy, Andy and the crew members. The team on site were professional, friendly, and incredibly efficient. They worked with real attention to detail and kept everything tidy throughout. It’s easy to see why Rockwarm has such a strong reputation locally for first-class service. The end result looks fantastic and has already made a noticeable difference to the comfort of my home. I highly recommend Rockwarm.
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GeorgeO-152
Yell
Areas we cover
Where We Work
Based in Nuneaton, covering the Midlands:
Coventry
CV1 to CV6, all neighbourhoods
Nuneaton & Bedworth
CV10 to CV13
Birmingham
B1 to B98 across the city
Solihull and Sutton Coldfield Warwickshire
Leamington, Warwick, Rugby, Stratford
Leicestershire
Hinckley, Lutterworth, Market Bosworth
Not sure if we cover your postcode? Just call.
FAQS
Common Questions About External Wall Insulation
External Wall Insulation
Ready for a Warmer Better-Looking Home?
Book your free home survey and we'll call you back within 2 hours to find a time that works. No obligation, no pressure, no charge — just expert advice from a team that's been doing this for 40 years.
