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Insulation Boards
The boards would need a stud wall, adding 2 ½ - 4 inches to the current walls, and would require the refixing of items such as switches, radiators and kitchen units. The installation would result in a loss of space in the property. The majority of costs will be labour, so acquiring the thickest insulation possible is recommended.
Including stud wall and installation.....................................£100/m2