Internal Wall Insulation
Insulate solid walls from inside. Save £300-£500/year. Often free with ECO4
Get Free Quotes from InstallersWhat is Internal Wall Insulation?
Internal Wall Insulation (IWI) involves fitting insulation boards to the inside of solid external walls, then covering with plasterboard. It's ideal when external insulation isn't possible due to planning restrictions, appearance concerns, or property type.
IWI can reduce heat loss by up to 40% and saves £300-£500 per year on heating bills. It's typically cheaper than external wall insulation and doesn't change your home's exterior appearance.
Key Benefits
Often Free
ECO4 grant covers full cost for eligible solid wall homes
Big Savings
Save £300-£500/year on heating bills
No Exterior Change
Keeps original appearance - good for listed buildings
Room by Room
Can be done gradually, one room at a time
Warmer Home
Reduce heat loss by up to 40%
Lower Cost
Typically cheaper than external wall insulation
Internal Wall Insulation Costs
ECO4 Grant - Often FREE!
Solid wall homes with low income or benefits often get IWI completely free through ECO4
Quick Grant Finder
Answer 3 quick questions to see which grants you may qualify for
Ready for Internal Wall Insulation?
Get free quotes from certified installers. Often free with ECO4 grant
Get Free Quotes from Installers