Construction Calculators

Construction — materials and costs

Every renovation or construction project starts with an accurate material estimate. Paint for walls is usually the first purchase — coverage depends on the substrate absorbency, number of coats, and paint type. A standard emulsion covers 8–12 m² per litre per coat, but freshly plastered or dry-lined walls typically need a primer coat first. Floor tiles must account for a 10% waste allowance for cuts and breakages, rising to 15% for diagonal or complex layouts. The tile calculator converts the room area into an exact piece count, reducing the risk of buying a second batch with a different shade. Flooring panels are sold in packs covering a set number of square metres. The panels calculator converts room area into pack quantities including a cutting margin, factoring in the laying direction and skirting offcuts. Styrofoam insulation is a cornerstone of energy-efficient construction. The thickness of the insulation layer determines the wall U-value and annual heating costs. Under Polish WT 2021 regulations, external walls must achieve U no higher than 0.20 W/(m2·K), which typically requires 15–20 cm of EPS 031 polystyrene. Concrete is used for foundations, floor slabs, and ceilings. Volume is calculated as length × width × thickness, with a 5–10% waste addition. The concrete calculator also estimates aggregate and cement quantities for common mix classes such as C20/25 and C25/30. Renovation costs depend on the scope of work, material quality, and regional labour rates. A full apartment fit-out in Poland typically runs 800–2,000 PLN per m². The renovation cost calculator lets you itemise all trades and materials to arrive at a reliable total budget before work begins.