Solid Wall Insulation (IWI)

Insulating solid walls could cut your heating costs considerably, because they let through twice as much heat as cavity walls

Internal Wall Insulation Grants

Internal wall insulation can dramatically reduce the amount of warmth that escapes from a property thereby reducing energy bills and creating a warmer home.

Properties built prior to 1930 will most likely have solid walls. These typically allow more heat to pass through than a standard cavity wall, but can still be insulated.

Solid walls can be insulated from the inside. Typically this will cost more than insulating a standard cavity wall, but the savings on your heating bills will be bigger too.

Typical installation costs for a solid wall insulation is around £7,400, However this can be done for free under ECO3

*Based on a typical semi-detached house in Great Britain


About Eco Home Network

Our organisation is ranked among one of the best for ECO3 funding in the UK. We’ve been blessed with amazing partners who have helped us through our journey and help us provided outstanding service for our customers.

Boiler Replacement is one of many energy efficency grants we can provide for you, others include:

  • Room in the Roof Insulation
  • Internal Wall Insulation
  • Smart Thermostat Controls
  • Free Boiler Replacement
  • First Time Central Heating Systems
  • Electric Room Heaters
  • Electric Storage Heaters
  • Air Source Heat Pumps
  • Cavity Wall Insulation
  • Underfloor Insulation
  • Loft Insulation

Check your eligibility

Use our simple online form to find out if you qualify for government-backed ECO3 grants.

Fill out in 30 seconds & see if you qualify!

Frequently Asked Questions

Is internal wall insulation messy to install?

Internal wall insulation is disruptive but can be done room by room. Light fittings, radiators and pipework on internal walls will need to be removed and reattached so that they are flush with your new ‘wall’. Leaving you with a freshly plastered interior wall.

How can you tell if you do not have cavity walls?

Solid walls were generally used in building before the early 1930s, so knowing the age of your home is the first useful step in figuring out if you have them. If your home was built before 1930, then it’s highly likely you have solid walls.
Another useful trick is to look at the pattern of your house bricks. A regular pattern of bricks – where all the bricks have square pattern mixed between the usual laid on the long side.
But please don’t worry, we’ll assess your property thoroughly to see if you have solid walls when we come to see you..

Does internal wall insulation cause damp?

No, as it is installed on the inside of your property, if you do notice damp, you need to urgently weatherproof your external walls as they have failed.

What does Solid wall Insulation cost?

Based on a 3-bed semi-detached house, typical installation costs* of solid (Internal) wall insulation is around £7,400.
ECO3 covers internal Wall Insulation so you could have it installed for free if you receive one of the qualifying benefits

Do I need to be a homeowner to qualify for Solid Wall Insulation grant?

No, If you privately rent and not social housing, you should qualify as long as you also in receipt of an ECO3 qualifying benefits

Is Solid wall insulation worth it?

Yes, Especially through ECO3, You can save thousands on the installation alone, plus your reduced energy usage will save you a lot of the next decade.

The brighter way to save energy

The new Nest Learning Thermostat

A thinner, sleeker design. A bigger, sharper display. Hot water control. The 3rd-generation Nest Thermostat is more beautiful than ever. With Farsight, it shows you the time or the temperature you've set from across the room. And the Nest Thermostat saves energy. That's the most beautiful part.

Top features:

  • Energy-saving smart home temperature control
  • Remote control and smart home integration with Alexa and Google Assistant
  • Home Report shows how much energy you've saved and helps you use even less
  • Auto-switch on when you walk into the room with Farsight

Nest Learning Thermostat, 3rd Generation


Save energy with the 3rd-generation Nest Learning Thermostat. Featuring a stylish and slender design, you can control the temperature of your home using your smart device.

After just one week's use, the Nest thermostat learns your preferences and not only adjusts the heating in the way you like, but goes to Eco mode when it senses you've left the house.


Remote control

You can access your Nest Thermostat remote control via a smartphone, tablet, or laptop to prepare the house for your arrival, and there's also control for your hot water tank, so you only heat what you need.

It is also compatible with Smart Home products – with two Skills for Amazon Alexa voice control, and Google Assistant and Google Home, making temperature control seamless.

Home Report

The Nest heating app shows you a breakdown of daily energy use and provides a monthly Home Report, so you can see how much you're using.

If there are peak times where energy use is high it also suggests how you can use less, saving you money in the long run.

Auto-switch on

Thanks to Farsight, the smart thermostat now lights up when you enter the room, showing you the temperature, weather, or time.

No matter if it's a bit chilly outside in the winter, or bright and sunny in the summer, as Nest Sense takes this information into account when working out how warm to keep your home.