Cavity wall insulation
Cavity Wall Insulation

Cavity Wall Insulation

Around 33%* of a home’s heat is lost through uninsulated cavity walls. By having insulation professionally installed into the space between your home’s two layers of brick, you will save energy and reduce your heating bills.

You can expect to save around £300* per year on your energy bill (based on a gas-heated semi-detached home) rising to £520* per year (based on a gas-heated detached home).

Get cavity wall insulation today!

Cavity wall insulation is a simple yet highly effective way to improve your home’s energy efficiency. Whether you’re a homeowner looking to reduce energy bills or a landlord aiming to meet legal requirements, cavity wall insulation offers numerous benefits.

The advantages are clear, from reducing heat loss to enhancing indoor comfort and contributing to environmental conservation. Ready to make your home more energy-efficient? Book a free home visit with Evolve HES today and start enjoying the benefits of cavity wall insulation. Our team is here to guide you every step of the way, ensuring a smooth and hassle-free process.

hot offer fully funded insulation

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What is cavity wall insulation?

Cavity wall insulation is used to fill the gap between two brickwork layers that make up many homes’ external walls. If left uninsulated, this gap, or cavity, can be a significant source of heat loss. By filling this space with insulating material, homeowners can significantly reduce the heat that escapes through their walls. This leads to lower energy costs and a more comfortable living environment.

How does cavity wall insulation work?

Insulating cavity walls involves injecting an insulating material into the cavity. This is typically done by drilling small holes into the external wall of the property. The insulation material, often foam or beads, is injected into the cavity. Once the cavity is filled, the holes are sealed, ensuring the insulation remains effective.

Learn about the steps our team takes to install a cavity wall:

Assessment:
• A professional assessor examines your walls to determine whether they suit cavity wall insulation.
• They check for any existing insulation and assess the condition of the cavity.
Preparation:
• Small holes are drilled into the external walls at regular intervals.
• These holes provide access points for the insulation material.
Injection:
• The chosen insulation material is injected into the cavity through the drilled holes.
• This process ensures an even distribution of the material within the wall cavity.
Sealing:
• Once the cavity is filled, the holes are sealed with cement or a matching material to restore the appearance of the wall.
• The entire process is usually completed within a few hours for an average-sized home.

What are the benefits of cavity wall insulation?

Cavity wall insulation is an effective way to improve your home’s energy efficiency and reduce heating costs. Filling the gap between the exterior and interior walls with insulating material helps to prevent heat loss and maintain a consistent indoor temperature. This leads to a more comfortable living environment and reduces energy bills and carbon footprint. Explore the key benefits of cavity wall insulation and how it can be a valuable investment for your property:

Energy Efficiency:

Reduces Heat Loss:

  • Around 33% of a home’s heat is lost through uninsulated cavity walls.
  • Insulating your walls can prevent this heat loss, making your home more energy-efficient.

Lower Energy Bills:

  • Homeowners can save approximately £300 per year on energy bills for a gas-heated, semi-detached home.
  • For a gas-heated detached home, savings can rise to £520 per year.

Improved Comfort:

Stable Indoor Temperatures:

  • Insulation helps maintain a consistent and comfortable indoor temperature.
  • This reduces the need for excessive heating or cooling.

Enhanced Well-being:

  • A well-insulated home is more comfortable to live in.
  • Improved thermal comfort can have positive effects on health and well-being.

Environmental Benefits:

Reduced Carbon Footprint:

Sustainable Living:

  • Energy efficiency is a critical component of sustainable living.
  • By reducing energy consumption, you are contributing to environmental conservation.

WATCH: our handy video guide

Our handy video guide to cavity wall insulation

What are the costs and funding options?

The cost of cavity wall insulation can vary based on the size and condition of your property. However, as an accredited installer, Evolve HES has access to various funding sources that can make insulation free or very low-cost for you. Funding comes from:

Cavity Wall Insulation Cost:

  • The cost of cavity wall insulation varies depending on the size of your property and the type of insulation used.
  • Typical costs range from £300 to £700 for an average-sized home.
  • However, many funding options are available to help cover these costs.

Cavity Wall Insulation Grants

Great British Insulation Scheme (GBIS):

  • The GBIS enables millions of UK homes to receive cavity wall insulation for free.
  • The funding is provided by energy companies, local authorities, and the government.
  • Our team will check your eligibility and guide you through the application process.

Local Authority Grants:

  • These grants can significantly reduce or even eliminate the cost of installation.
  • Some local authorities offer grants or subsidies for cavity wall insulation.

Who needs cavity wall insulation?

Wondering if you need cavity wall insulation? Our team can help determine whether your property is suited for the insulation. Explore the different types of properties and people that might benefit from this insulation:

Homeowners:

Older Properties:

  • Homes built with cavity walls before the 1980s often lack adequate insulation.
  • Insulating these properties can bring them up to modern energy efficiency standards.

Newer Homes:

  • Even newer homes can benefit from additional insulation.
  • Enhancing existing insulation can further improve energy efficiency.

Landlords:

Tenant Satisfaction:

  • Providing a well-insulated property can enhance tenant satisfaction.
  • This can lead to longer tenancies and reduced turnover.

Legal Requirements:

  • Landlords may be required to meet certain energy efficiency standards.
  • Insulating cavity walls can help comply with these regulations.

How do I start?

Initial Contact:

  • Reach out to our team via phone or email.
  • We’ll ask a few questions to understand your needs and property type.

Free Home Visit:

  • We’ll schedule a free home visit at a convenient time for you.
  • Our Home Surveyor will assess your property, confirm suitability, and take measurements

Installation:

  • Our friendly technicians will install the insulation shortly after the assessment.
  • The process is quick and minimally disruptive.

Enjoy the Benefits:

  • Benefit from lower energy bills and reduced environmental impact.
  • Start enjoying a more energy-efficient and comfortable home.

Identifying your wall type

As well us using the age of your property to determine its wall type, you can also take a look at the brick pattern.

Example of solid wall

Solid wall

The bricks will have an alternating pattern so that some bricks are laid lengthways and some bricks are laid widthways, showing the smaller ends.

Example of cavity wall

Cavity wall

The bricks will have an even pattern with all the bricks laid lengthways.

Best quality,
guaranteed

EvoBead is our sister company that manufactures and supplies high-performance EPS bead for cavity wall insulation from their premises in South Wales.

All our cavity wall installations are carried out using the EvoBead product meaning we are absolutely guaranteed of its thermal properties and performance.

evolve hes logo
  • Award-winning
  • KIWA approved 
  • 10-year product guarantee
  • No water absorption 
  • Thermal rating of 0.033 W/mK
  • 50% fewer drilling/injection holes 
  • 33% reduction in ladder movements

evolve installation team

Why choose Evolve?

We’re great at what we do and our team has over 450 years’ experience between us so we know how to do an excellent job. We only use the best materials and all our surveyors and engineers are highly trained and take pride in their work.

2015

Established in 2015

60

60 members of staff

450

450 years of combined experience

15,000

Over 15,000 homes decarbonised since 2015

80

A further 80 homes decarbonised every week

3,000

3,000 cavity extractions project managed

call us today evolve home energy solutions

We’re open between 9am and 5pm, Monday to Friday. Or drop us a message and we’ll get back to you ASAP.

Cavity Wall Insulation FAQs

What is a cavity wall?

A cavity wall is a construction type whereby a wall is constructed of two layers of a brick with an air gap (or cavity) between them. It is how homes have typically been constructed in the UK since the 1930s.

What is cavity wall insulation?

Cavity wall insulation is when insulation is injected into the air gap (or ‘cavity’) between the two layers of bricks that make up a cavity wall. The insulation creates a thermal barrier, preventing excessive heat loss through a home’s walls.

Why should I have cavity wall insulation?

Homes should be cavity wall insulated, if possible, to help the occupants reduce their energy usage and therefore lower their energy bills.

How long does cavity wall insulation take to install?

A typical three-bed semi can be installed in around half a day.

What prep do I need to do before cavity wall insulation is installed?

The installation crew need good access to your home’s exterior walls so please move flower pots, hanging baskets and other obstructions.

How much money can cavity wall insulation save me on my heating bills?

Cavity wall insulation can save up to £520 per year* on a gas-heated, detached home’s energy bills.

What insulation product do you use?

We install EvoBead, manufactured by our sister company so we are 100% sure of its exceptional insulating properties and performance.

How much does cavity wall insulation cost?

It depends on a range of factors so it is hard to give a figure. Plus, we often have access to funding that can make cavity wall insulation free or partially funded, depending on your circumstances. Our Home Energy Surveyor will advise on this during their home visit.

Can I get cavity wall insulation for free?

Yes, sometimes we can install cavity wall insulation completely free of charge, depending on the funding that is available at the time, your circumstances and your property type.

* Estimates taken from the Energy Saving Trust, August 2023 (www.energysavingtrust.org.uk)