Green Deal Internal Wall Insulation

Internal Solid Wall Insulation

Internal solid wall insulation can cut your heating costs by helping to stop heat escaping through your internal walls. Heat loss through solid walls is around twice as much as the heat loss homes with unfilled cavity walls would experience, therefore, insulating your solid walls will dramatically reduce your heating bills and heat loss.

There are two main forms of internal wall insulation available with the Green Deal internal wall insulation funding: rigid insulation boards or a stud wall. The insulation that is best for you depends on your property and whether you require the insulation to hold heavy fittings such as radiators and kitchen units.

How internal wall insulation works

Heat will always flow to cooler spaces, so if you heat your living room the heat will escape through your internal solid walls as it is cooler outside, thus making your heating system work harder. Insulation works by decreasing this flow through effective resistance to the flow of heat. Insulation is rated by R-value, this means it is rated in terms of thermal resistance. The higher the R-value the greater the insulating effectiveness or resistance.

Pros and cons of internal wall insulation


  • Internal wall insulation is, as a rule, cheaper to install than external insulation
  • Will save you money on your heating bills - around £460 a year for a detached gas-heated home
  • Keeps your home warmer in winter and cooler in the summer
  • It also helps to reduce condensation due to warmer internal walls which will reduce the likelihood of air condensing on the wall.
  • If you have a house which is pre-1920 this is an option for you as you can not have cavity wall insulation. However, if your home was built between 1930 and 1980 then your home probably has cavity walls and would be suitable for Green Deal cavity wall insulation.

  • You could also qualify for the Energy Companies Obligation (ECO) funding scheme where your Green Deal internal wall insulation could be installed 100% free.


  • You will need to treat bare brickwork to eliminated any areas where air can escape.

  • Will make a room smaller and reduce floor space by up to 100mm.

  • Internal wall insulation is more disruptive than external wall insulation but it can be done room-by-room and when you are redecorating.

  • Skirting boards, door frames and any external fittings have to be removed and put back after the work has taken place.

  • It can be hard to attach heavy items to the insulation once it has been installed. However, special fixings are available.

  • Any damp in the walls needs to dealt with before the insulation can be installed or there will be major issues in the future due to trapped moisture underneath the insulation.

Contact us!

Call 0800 6891762 or fill in the form to the right for more info about getting internal wall insulation installed through the Green Deal, and advice on what is best for you and your property.  

You can get the finance for installing Green Deal internal wall insulation with Green Deal Upgrade, through our energy-efficiency home improvement loan scheme where you will pay your loan back through your energy bill savings. For further reading check out the Green Deal Golden Rule that protects you, the homeowner.

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