The estimated cost of loft insulation in 2023 is between £150 and £200 per day for tradespeople, while loft insulation costs vary depending on the kind, thickness, size, and area of the insulation. For insulating a warm loft, the material utilised should be denser and more stiff than when insulating joists. There are four different types of loft insulation: blown-fibre insulation, loose-fill insulation, insulation boards fastened to roof joists, and blanket insulation installed in between joists.