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External Wall Insulation

Fully Qualified Plasterers

Ralph Plastering is certified by British Gypsum, holds accreditations with CHAS and SMAS Worksafe Contractor and is recommended by Weber.


Our plastering company has over 20 years of experience in the industry working on all types of domestic and commercial projects.​

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Our plasterers in South London and Surrey come highly recommended and always strive to reach complete customer satisfaction.

External Wall Insulation London

EWI Installer Providing All Aspects Of Exterior Insulation

Ralph Plastering provide external wall insulation London and Surrey and have over 20 years experience installing exterior insulation systems. We trained Weber Recommended Contractors, EWI Pro Recommended Installers, offer 10 year product warranties and workmanship guarantees to ensure customers have total peace of mind.

Having external wall insulation installed (EWI) is a highly effective way of insulating your property. Exterior insulation is suitable for houses without a cavity or solid wall construction and is designed to make your significantly home warmer. Our EWI systems can be finished and covered with either lightweight monocouche or silicone rendering.

If you are looking London based external wall insulation specialists to help install an exterior insulation system, then get in touch with us to request a free quote and consultation today. From here we can book a date for a free survey and then discuss next steps. Click the make an enquiry button below to get started on your EWI project today!

Looking For An External Wall Insulation Installer? Book a call today!

External Wall Insulation London - EWI Installation - Ralph Plastering

Is External Wall Insulation Worth It?

EWI Installer Providing All Aspects Of Exterior Insulation

We are often asked whether or not getting external wall insulation installed is worth it in terms of return on investment. We believe it is! As you can see from the house diagram up to 33% of heat is lost through the walls of our home. This causes a constant chill which leads people to switch the heating up full which costs a significant amount of money.

When you heat a cold room with freezing walls it forms condensation on the exterior wall. The same thing happens to your windows. The warm air hits the cold walls which creates moisture. As a consequence, due to the constant cooling and heating, moisture builds up producing mould and damp, which can lead to high potential repair costs.

External walls are cold because they are the only barrier between the room and outside and typically have no cavity. External wall insulation is easier to install compared to internal wall insulation because it involves the hassle of removing skirting boards, carpets/flooring, plastering boarding, painting and decorating, removing radiators, etc. 

External Wall Insulation Prices

There are several factors that will determine your external wall insulation quote. For example, whether you have solid walls, the type of insulation components required, how much scaffolding is needed, what rendering finish you choose (silicone or monocouche), etc, etc.

Approximately you can expect a professional and fully trained EWI specialist to charge between £150 to £200 per m2 (including labour and materials). You DO NOT want to go cheap on exterior insulation because a poorly installed system will lead to you having to pay even more to fix it, ripping off the old and starting again, further down the line.

It is worth considering other potential costs including scaffolding and alterations to window sills, guttering and down pipes and verge trims to accommodate the additional 90-120mm for the render. Please click here to see our rendering prices and here to read our full guide on how much does external wall insulation cost.

Our EWI Installation Process

Our EWI installers has over 20 years of experience and come highly recommended by previous customers who have commented on how much care and respect our team had whilst carrying out the work on their home. We will do everything we can to ensure your experience with Ralph Plastering is that of total satisfaction.

The process for insulating exterior walls is as follows:

  1. Scaffolding erected to provide easy and safe access.
  2. Protect windows, guttering and other external fixtures.
  3. Install EPS boarding and prepare all areas requiring EWI.
  4. Base coat and mesh application.
  5. Finish with customers choice of appropriate renders.
  6. Waste disposal, cleaning and dismantling scaffold.

Looking For External Wall Insulation In London or Surrey?

Ralph Plastering has over 20 years of experience and is a highly recommended and EWI Pro approved installer of exterior wall insulation in London and Surrey.