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External Wall Insulation

External Wall Insulation in London & the Home Counties

Improve your property's energy efficiency, cut heating bills and transform its appearance with a professionally installed EWI system — free survey, no-obligation quote.

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What Is EWI?

Insulation That Pays For Itself

External wall insulation (EWI) fits an insulating layer to the outside of your property, then finishes it with a durable weatherproof render. It's one of the most effective ways to improve a solid-wall property's thermal performance — cutting heat loss, lowering energy bills, and giving the whole exterior a modernised finish at the same time.

We install EWI systems using a range of insulation boards, finished with your choice of render — silicone, acrylic, K Rend or traditional sand & cement — selected to suit your property, budget and the look you're after.

External wall insulation render being applied on scaffolding

Our Process

How It Works

1

Free Survey

We visit your property to assess condition, scope and the right options for your project at no cost.

2

Tailored Recommendation

You'll get a clear, no-obligation quote and a system recommendation suited to your home.

3

Installation

Our in-house team carries out the work to schedule, keeping disruption to a minimum.

4

Aftercare & Support

Our team remains on hand for ongoing support after completion.

Why Choose EWI

The Benefits of External Wall Insulation

A well-installed EWI system does more than cut your heating bills.

Our Work

Recent EWI Projects

A selection of real external wall insulation projects completed by Dan Rendering Ltd.

External Wall Insulation — Before & After
External Wall Insulation — Before & After
External Wall Insulation — Before & After
External Wall Insulation — In Progress

Contact Us

Get Your Free Quote

Book a free survey and get a no-obligation EWI quote from your local Dan Rendering Ltd team.

Contact Details

Request Your Free Quote

Fill in the form below and a member of the team will be in touch to arrange your free survey.

FAQs

Common Questions

What is external wall insulation?

External wall insulation is a layer of insulation board fitted to the outside of a property and finished with a protective render. It improves thermal performance without losing any internal floor space.

Is my property suitable for EWI?

Most solid-wall properties are suitable, and it can also suit some cavity-wall properties. We'll assess your specific property during a free, no-obligation survey.

How much does EWI cost?

It depends on the project — cost varies with property size, insulation type and finish chosen. We provide a free, no-obligation quote after survey.

Will EWI change how my house looks?

Yes — for the better. EWI is finished with a render coat available in a wide range of colours and textures, giving your property a modernised, uniform exterior.