Measure exterior walls, subtract windows and doors, then estimate insulation panels or mineral wool packs and their cost. For early planning only.
Estimate insulation ↗Excludes labor, fixings, membranes, cladding and delivery. Entered thickness is not a building-design recommendation.
For a simple rectangular house, enter the exterior length, width and wall height. The calculator multiplies the perimeter by height; subtract the summed areas of windows and doors. Gables, recessed walls and irregular elevations must be measured and added separately. Do not confuse floor area with wall area.
Real insulation boards and batts are sold in packs with a specified coverage measured in m² at a particular thickness. Enter that coverage from the manufacturer’s label. Apply an allowance for cutting and offcuts; the number of packs rounds up to whole packs. Areas of corners, returns, reveals and door/window junctions may need additional detail or material.
Thickness alone is not a sufficient insulation specification. Check the product’s declared thermal conductivity, fire classification and suitability for the substrate. Existing wooden walls need an assessment of moisture, drainage, air leakage and drying potential. Exterior wall build-ups and vapor control should be designed for the house and climate before materials are bought.
An 8 × 6 m rectangular house with 2.6 m exterior walls has 72.8 m² gross wall area. Subtract 12 m² of openings and add a 10% cutting allowance: the buying area is 66.88 m². If one pack covers 5 m² at the chosen thickness, buy 14 packs. At €35 per pack the indicative material cost is €490, excluding fixings, membranes, render, installation and VAT differences.
No. The tool calculates rectangular exterior walls only. Measure the roof and attic separately.
No. Pack cost is for insulation material only. Compare labor scopes and request a written quote.