I hope this is the right place for this, if not, apologies.
I bought a house about 8 years ago, second hand. It is about 35 years old and as you can imagine its energy rating would not be that good. I was looking to insulate it better and have done the attic myself. However I would also like to do the walls. Now as the house is not that big I do not want to loose any area on the inside so am thinking about insulating the external walls.
Has any one done this?
What is the average width that is added to the outside wall? I ask this as we have small enough side passage where we can bring our bins out and the lawn mower etc. and I do not want to make that too small either.
Finally, costs. What does it cost, I guess every house is different but a square meter or something?