The cost to install external wall insulation can vary and is based on a few factors:
The size of your home.
Which materials are used.
How you would like your new outside walls to look.
For example, it would cost around £11,000 for a three-bedroom semi-detached home.
(Based on April 2024 prices).
Energy efficiency:
External wall insulation is a great way to make your home more energy-efficient. It keeps it at a comfortable temperature, so you use less energy to heat or cool your home.
Here’s how much CO2 you could save depending on the size of your home:
Your home | CO2 savings (kg/year) |
One-bedroom mid-floor flat | 410 |
Two-bedroom terraced | 500 |
Detached bungalow | 500 |
Three bedroom semi-detached | 900 |
Four-bedroom detached | 1,500 |
(Data based on Energy Saving Trust. Insulating a gas-heated home, 2024 fuel prices).
How does external wall insulation work?
External wall insulation works by adding an extra layer to the outside of your house. This layer helps keep the warmth inside during the winter and keeps hot air out during the summer.
After the insulation is added, the walls are covered with a new smooth surface to make everything look like new. This helps your home stay comfortable and saves you money on your energy bills.
Average installation time:
1 week
Approximate cost saving:
Savings depends on how big your home is and your energy costs.
Here’s a breakdown of how much you could save with external wall insulation:
Type of home | Savings per year |
One-bedroom flat | £140 |
Two-bedroom terraced | £170 |
Detached bungalow | £220 |
Three-bedroom semi-detached | £290 |
Four-bedroom detached | £500 |
( Energy Saving Trust. Based on July 2024 fuel prices).
Is external wall insulation right for my house?
External wall insulation is a good choice if you want to save money on energy bills. It’s especially helpful if your house has solid walls and you want to improve its energy efficiency. The inside of your home won’t be disrupted during installation.
It can be more expensive than other types of insulation, but you can get a government grant to help cover the costs.
FAQ's - External Wall Insulation
If you want to save money on energy bills, external wall insulation is a great option. It adds an extra layer to the outside of your walls. This means you would use less energy to heat or cool your home, which saves you money. A three-bedroom semi-detached home could save around £290 a year with external wall insulation.
If you live in York, you may be eligible for a government grant to help cover the cost. Our advisers can help you choose the right insulation for your home and help you get it installed. They can also explain how to apply for a grant, making it more affordable to enjoy the benefits of insulation.
(Energy Saving Trust. Based on insulating a gas-heated home, 2024 fuel prices).
Is external wall insulation right for your home?
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External Wall Insulation
Save on your energy bills.
Get a government grant to help cover the cost.
Lower your carbon footprint.
How does external wall insulation work?
External wall insulation acts as a cosy blanket for your home. It helps keep your home warm in winter and cool in summer, so you don't need to use as much energy. It's especially useful for homes with solid walls.
To install it, your gutters and drainpipes are carefully taken off. Special insulation materials like mineral wool, PIR, XPS or wood fibre are then added to the outside of your home. Once installed, your walls get a new smooth layer of render, or an imitation brick (brick slip) to make them look fresh. Your window sills might be adjusted, and gutters and drainpipes will be put back in place.
What does external wall insulation look like and where does it fit in your house?
This special material can be fluffy like wool, made from wood, or a type of plastic. It might look like big flat panels or sheets.
The insulation is put on the outside of your house, but the installers will make everything look new again. This includes rendering the outside wall. You won’t be able to see the insulation.
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How can I make external wall insulation more cost-efficient?
External wall insulation is a great way to save on your energy bills. It can work even better when paired with other energy solutions.
Case Studies
Our case studies are real-life scenarios of York residents who have recently installed energy-efficient solutions in their homes. They have since become our Community Energy Champions, and you will be able to connect with them if you decide to use YorEnergy on your own journey towards energy efficiency!
