{
  "cavity_wall_insulation": { "unit_cost_per_m2": 18.5 },
  "loft_insulation": { "unit_cost_per_m2": 12.0 },
  "suspended_floor_insulation": { "unit_cost_per_m2": 25.0 },
  "solid_floor_insulation": { "unit_cost_per_m2": 45.0 },
  "mechanical_ventilation": { "unit_cost_per_m2": 450.0 }
}