Question: how much does it cost to insulate walls in an existing homes?
Answer: As a rough guide, these are some sample prices taken for batt insulation, to give you an idea of what costs you are looking at per R value: R 2.0 batts: around $35 to cover 8.17m2 of wall or ceiling space. R 2.5 batts: around $58 to cover 7.0m2 of wall or ceiling space.