Render and EWI solutions offer a quick, cost effective and safe method to protect external facades, improve thermal performance and visually improve the appearance of buildings.
external wall insulation render

Rendering external walls is a great way to improve and update the appearance of the existing building. Not only beneficial for aesthetic purposes, Render will also protect the substrate and provide water resistance, reducing any water ingress and generally acting like a protective layer against the elements.


Technologically advanced silicone and acrylic-based Render systems with impressive performance levels are now readily available. These products allow for flexibility to meet the most demanding designs, façade curvatures, or colour options while at the same time improving and optimising façade performance and durability.


External Wall Insulation Systems predominantly have a Render finish which is suitable for application on a wide variety of buildings. BTS work with many suppliers who have an extensive range of systems to accommodate the requirements of a particular project, from directly fixed systems to systems incorporating a cavity. The use of insulation within the system allows high levels of thermal performance to be achieved, with the thickness being calculated based upon the specific wall build-up and the u-value required for the project, improving the overall energy efficiency of the property and reducing carbon outputs.

Our PAS 2030 accredited teams ensure EWI systems are designed and installed to the highest standards and provide assurance the completed project meets compliance Building and Fire Regulations.
Our EWI installations are also backed by The Solid Wall Insulation Guarantee Agency (SWIGA) providing assurance of safe, compliant, quality installations. The SWIGA guarantee offers cover for; external wall, internal wall and hybrid render systems for traditional solid wall properties, non-traditional properties such as no-fines concrete and frame buildings. As well as providing cover for low- and high-rise apartments.

Benefits of using Render

Whether to an existing building or a new development, Build-Therm Services has the experience, wealth of knowledge and dedicated in-house and supply chain labour to ensure the right render/finish will be selected to create inspiring, functional, and durable façades.
Provides protection against cracking surfaces

Enhanced algae and fungus resistance

Suitable for application onto many surfaces incl. masonry and SFS

Available in a wide range of colours

Polymeric for enhanced water repellent and weather protection


Vapour permeable for façade breathability

Render Projects

Latest News

  • Build-Therm Services appointed to Fusion21 Decarbonisation Framework We are delighted to confirm that Fusion21 has appointed Build-Therm Services to Lot 1 (Whole House Refurbishment up to £500m) of their Decarbonisation Framework.  Working alongside other specialist firms BTS will deliver decarbonisation works to support organisations such......

  • Reducing waste and finding the façade solution to benefit you and the environment   Over one-third of the UK’s waste comes from the construction industry alone.   We, the construction industry, consume the largest number of the UK’s natural resources. The sector uses 400 million......

  • We are the award winning façade company and we have the trophies to prove it! It is an extremely exciting year-end for Build-Therm Services. We are proud to announce we have been awarded for two projects within our portfolio. Wembley Point was successful in achieving......

  • Howard Gardens has been shortlisted at this year’s Insulated Render and Cladding Association (INCA) Awards! Alongside SPS Envirowall we are super excited to announce Howard Gardens has made the shortlist within the New Build – Insulation, Clay, Brick, Ceramic or Stone Finish category. Howard Gardens, Cardiff has......