Cavity-wall insulation
The cavity filled through small holes drilled in the mortar joints: ± € 1,500-3,000 per home.
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With cavity-wall insulation the installer fills the air gap between the inner and outer wall with insulation material — EPS beads, glass-wool flakes or PUR foam. It is done from the outside, through small holes drilled in the mortar joints that are neatly finished afterwards. In most homes the work is completed in a single day.
For an average home you pay € 1,500 to € 3,000, including labour and materials. The facade surface drives most of the price: a terraced house has two facades to insulate, a detached home four. Beforehand, the installer checks with a borescope inspection whether the cavity is suitable — wide enough, clean and dry — and whether protected species (such as bats) are present in the cavity; that check is part of a proper quote.
Good to know: a national insulation subsidy (ISDE) exists. The conditions change regularly — ask the installer about the current scheme and have it named in the quote.
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