How Much Can External Wall Insulation Save You on Your Energy Bill?

Jub Systems • April 13, 2022

With inflation baring its teeth at British households, external wall insulation is definitely an option that can increase your energy cost savings. However, how do you know if external wall insulation is right for your home?

Is External Wall Insulation Right For You?

Essentially, what external wall insulation does is reduce the heat lost from your home. It’s a type of insulation that involves fixing an insulating material to external walls, with a protective render over the top. 


You will need to be aware of the type of walls the property has to know if you can have external wall insulation installed. If the property was built in the past 20 years, it's likely that it has cavity walls and they have already been insulated. If the property is more than 100 years old, it's likely to have solid walls, which means it will need external wall insulation installed to stop heat from escaping.


Once your external insulation is fitted, the decorative coatings will improve your home's kerb appeal. This can match a variety of homes depending on your existing features and preferences, including Georgian, Victorian and Edwardian properties.


External insulation is generally more expensive than internal, although you'll avoid the significant redecorating that comes with internal insulation. In addition,  there are government subsidies available that can help you cover most of the costs. 


We have gathered some information on the funding available here. It also might be worth contacting your council's energy efficiency officer to find out if something might be available in your area.


Another thing to keep in mind is if you’d need planning permission to have external wall insulation installed. Planning permission is not usually necessary for external wall insulation. 



However, if your property is listed, is in a conservation area or if the insulation will drastically change the appearance of your property, you should consult your local planning authority. If you’d like to learn more about planning permission, you can do so here.

External Wall Insulation Energy Savings

If your property meets the requirements for external wall insulation, you could save £115-360 a year. About a third of UK homes can be more energy-efficient with the help of external wall insulation, according to the National Insulation Association (NIA). And an estimated 45% of the heat from these homes could be escaping through the walls.


The exact amount of savings will depend on the type and size of the property. Here are some estimates on average reductions to heating bills and CO2 emissions for homes of different sizes.

Savings Per Year CO2 Savings Per Year
Detached house (four bedrooms) £650 1500kg
Semi-detached house (three bedrooms) £390 910kg
Mid-terrace house (three bedrooms) £245 580kg
Detached bungalow (two bedrooms) £260 610kg
Mid-floor flat (two bedrooms) £195 450kg

All data obtained from the Energy Savings Trust (EST).


If you’re considering having external wall insulation installed on your property but don't know where to start, our team is more than happy to help. We have built relationships with a range of professional and approved contractors across the UK. Contact us to learn more.

Modern detached house in the UK with JUB EWI and external render installed.

Transforming Your Home Exterior: Benefits of External Wall Insulation

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By Jub Systems • 19 Jul, 2023
Introducing the Great British Insulation Scheme, previously known as ECO+, a government initiative aimed at helping households insulate their homes, improve energy efficiency and reduce energy bills. With the scheme already launched and set to run until March 2026, it's time to discover how this £1 billion programme can benefit households across the UK. In this blog post, we'll delve into the details of the scheme, its eligibility criteria and the range of energy-saving measures available. Benefits of the Great British Insulation Scheme The Great British Insulation Scheme aims to support approximately 300,000 households by providing financial assistance for home insulation. By participating in the scheme, households can save an estimated £300 to £400 per year on their energy bills. The focus is on helping those with the lowest incomes, while also extending support to households living in energy-inefficient homes with Energy Performance Certificate (EPC) ratings of D or below, as well as those in lower Council Tax bands (A-D in England, A-E in Scotland and Wales). This inclusive approach ensures that more people, especially those struggling with high energy costs, can benefit from making their homes more energy efficient. The Aim of the Great British Insulation Scheme  The Great British Insulation Scheme has a clear goal: to deliver single insulation measures to two main groups of customers. The first group consists of low-income individuals who do not meet the minimum requirements for ECO4 assistance. The scheme aims to provide them with valuable insulation measures to improve their living conditions. The second group includes households based on council tax band and Energy Performance Certificate (EPC) rating, targeting a wider range of individuals who can benefit from energy-saving upgrades.

External Render Repair and Maintenance: Preserving Your JUB Render

By Jub Systems • 12 Jul, 2023
Welcome to our guide on external render repair and maintenance. Whether you have a JUB render and/or an external wall insulation system, proper maintenance is essential to ensure longevity and visual appeal. By following our step-by-step instructions, you can reduce the need for extensive render repairs in the future, saving you both time and money. Let's dive into the key steps for effective render repair and maintenance. Step 1: Thorough Cleaning and Primer Application Before starting any redecoration work, it's crucial to clean the external render thoroughly. Remove any visible dirt or dust from the surface, ensuring a clean and smooth base for the upcoming paint application. If necessary, treat the facade with JUB Fungi Wash to eliminate any fungal growth or contaminants. However, avoid using acid-based cleaners or solvents, as they can damage the external wall insulation system. To enhance the adhesion and durability of the new paint, we highly recommend applying an appropriate paint primer to the cleaned render. Step 2: Choosing the Correct Paint Choosing the correct paint is crucial for achieving a long-lasting and visually pleasing exterior finish. Take into account the type of render you have and consult our technical department at technical@jub.org.uk for guidance on the suitable paint product. Avoid using masonry paint that JUB Systems UK Limited hasn't advised to maintain warranties and prevent short-term maintenance cycles. Keep the original render's colour code on file for future reference to ensure accurate colour matching.

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