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External wall insulation

External wall insulation installers in the Midlands

Solid wall insulation, lower heating bills and a stunning rendered finish from a family-run team serving Coventry, Nuneaton, Birmingham and the wider Midlands since 1985.

What it isThe benefitsCosts and adviceWhat it looks likeHow it worksWhy RockwarmQuestions
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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.

Product screenshot

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.

Product screenshot

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.

Product screenshot

External wall insulation advice

External Wall Insulation, Costs and Render Options Explained

If you are comparing external wall insulation installers in the Midlands, the important questions are usually the same: will it suit my home, what will it cost, what finish can I choose, and who will look after the details properly?

What it means for your home

Insulating walls externally is often the best route for older solid-wall properties

External wall insulation is fitted to the outside of your home, so the cold wall is wrapped in a continuous layer of insulation before being finished with a protective render system. For older solid wall homes, non-cavity wall properties, tired pebbledash and hard-to-heat rooms, this can improve comfort without losing space inside.

Rockwarm surveys each property before recommending a system. We check access, substrate condition, damp risks, roofline details, pipework, windows, ventilation and the finish you want, because external wall insulation only performs properly when the details are installed properly.

Book a free EWI surveyRead customer reviews

External wall insulation cost guide

See the main factors that affect price before booking a survey, including property size, scaffolding, wall condition and finish choice.

Solid wall insulation guide

Understand why older non-cavity homes often need a different insulation approach from modern cavity-wall properties.

What happens during installation

Walk through the installation process, from survey and scaffolding through to the finished rendered exterior.

House rendering explained

Compare render-only refreshes with external wall insulation systems when appearance, weather protection and warmth all matter.

Questions to ask EWI installers

Use this checklist to compare installers, workmanship, systems, guarantees and aftercare before making a decision.

External Wall Insulation

See the difference a wrap makes.

Recent before-and-after projects from Rockwarm installations across the Midlands.

See more of our work
After External Wall Insulation
Before External Wall Insulation
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BeforeAfter

Drag the slider to compare the transformation.

After External Wall Insulation
Before External Wall Insulation
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BeforeAfter

Drag the slider to compare the transformation.

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 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.

G
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.

Book free survey