Calculating the cost of an external wall insulation (EWI) system is not as simple a task as you might think; the price not only accounts for the insulation materials but also the installation of the system, labour costs, square meterage (for example, our reinforcement mesh comes in 50m rolls while a bag of EWI-220 Adhesive will cover 3m2 of the wall), the choice of decorative finish and so on. What’s more, not only do the prices of materials vary, but some materials require fixings and some adhesive which will also be included in the price. Therefore, the cost of your EWI system depends entirely on the needs of your project. So, how does one go about calculating the cost of their EWI system?

Calculating the cost of the External Wall Insulation Materials

At EWI Store, we have just the solution for you. Not only do we have an excellent team on hand who will be happy to provide a quote – simply give them a call with some rough measurements of the area that needs to be insulated, and they can quickly calculate the EWI materials you need using their expertise – but we also have a fantastic tool available at your fingertips…

The EWI Materials Calculator

Whether you have experience with external wall insulation, or you’re keen to have a go, you can use our accurate, easy-to-use EWI materials calculator!

What is the EWI Materials Calculator?

The EWI Materials Calculator is an online tool that enables homeowners, installers and architects to quickly and accurately calculate the correct EWI materials needed to meet their requirements for their next project. The calculator will ask a series of questions to gather how much the system will cost depending on your needs.

The questions the EWI Materials Calculator will ask are as follows:

The information you need for the EWI Materials Calculator

You can choose between three options depending on what you are interested in: eco, premium and standard. This relates to the decorative finish you want on your walls.

  •  Amount of metres squared needed

To calculate the number of metres squared needed, multiply the width by the height of each wall you are going to insulate. Do not subtract windows or doors; this will give you an incorrect result as our calculator considers wastage in the final calculation.



So, whether you are a homeowner looking to install external wall insulation or apply a fresh new render façade to your home, a solid wall insulation installer looking for an easy-to-install product (at a great price) or an architect looking for a way to vastly improve the thermal efficiency of an old property, you have come to the right place.

Trade installers get fantastic prices and warranties on the system

As an installer, you may well be eligible for our trade discount prices too; so, not only will you get a BBA-approved external wall insulation system delivered directly to the site, but also the materials you need at a great price. As a trade partner, we are also able to offer system warranties provided the installers have been on our free training course. Be sure to sign up to our Trade Account for free to receive your discounts!

So, there you have it – if you need some help calculating the material requirements for an EWI job, give us a call or use our EWI Materials Calculator today!

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