External & Internal Wall Insulation

Modern External and Internal Wall Insulation is an effective way to increase the energy efficiency of your home. We offer 25 year insurance backed guarantee for all our installations. Finance Packages available.

External & Internal Wall Insulation Delivered as Part of a Whole-House System

External and internal wall insulation can significantly improve thermal performance, comfort, and energy efficiency — when correctly designed and installed. We deliver EWI and IWI solutions as part of a whole-house, system-led approach, ensuring insulation improves performance without introducing moisture, ventilation, or compliance risks.

We work with councils, housing providers, landlords, and homeowners to deliver both new installations and remedial insulation works, aligned with current standards and long-term building performance.

external wall insulation project in wales
external wall insulation project in wales

Design-Led Insulation, Not Just Installation

Wall insulation must respond to how a building behaves as a system. Our approach prioritises assessment, design, and coordination before installation.

Our process includes:
  • Property & Fabric Assessment
    We assess wall construction, exposure, moisture risk, ventilation, and existing insulation to determine the safest and most effective solution.

  • System-Led Insulation Design
    EWI or IWI is specified alongside ventilation and heating considerations to avoid unintended consequences such as condensation or overheating.

  • Retrofit Coordination & Compliance
    Works are aligned with PAS 2035 principles, with clear documentation, risk management, and sequencing.

  • Quality-Assured Installation
    Installation is delivered with robust quality control, inspection, and verification to ensure design intent is achieved on site.

This approach reduces remedial risk and delivers insulation that performs long after installation. We deliver:

External Wall Insulation (EWI)

Continuous insulation applied externally to improve thermal performance, protect building fabric, and enhance external appearance.

Internal Wall Insulation (IWI)

High-performance internal solutions for properties where EWI is not viable due to planning, access, or conservation constraints.

Remedial & Corrective Insulation Works

Investigation and correction of failed, non-compliant, or poorly performing wall insulation systems.

Integrated Retrofit Delivery

EWI and IWI delivered alongside ventilation upgrades, heating improvements, and wider retrofit measures.

What we address

Let us see how we can help you.

High Heat Loss Through Solid or Poorly Insulated Walls

Solid wall and hard-to-treat properties often lose significant heat. EWI and IWI improve thermal performance and internal comfort.

Historic or Underperforming Wall Insulation

Older installations may no longer meet current standards. We assess performance and deliver compliant upgrades or remedial solutions.

Thermal Bridging & Poor Detailing

Junctions around windows, doors, and floors are carefully detailed to minimise cold bridging and heat loss.

Key Benefits

Not always. Suitability depends on construction type, exposure, planning constraints, and existing fabric condition. We assess each property individually.
IWI is often appropriate where external changes are restricted or where specific wall constructions require internal treatment.
Poorly designed insulation can. Our system-led design considers ventilation and moisture risk to avoid these issues.
Yes. Wall insulation performs best when coordinated with ventilation, heating, and whole-house retrofit measures.

Latest Projects

Decarbonising Britain

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We offer products, solutions, and services across the entire energy value chain. We support our customers on their way to a more sustainable future – no matter how far along the journey to energise society with affordable energy systems.

Receive an accurate quote within 48 hours when you fill out this form. Or, email us on hello@myecomove.co.uk

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