8 calculators
Walls & Finishes
Drywall, plaster, insulation, paint, cladding.
Plasterboard CalculatorBoards, screws, scrim and skim for a roomPlastering & Rendering CalculatorSkim, bonding, hardwall and renderLoft Insulation CalculatorRolls to reach 270 mm, with U-valueSuspended Ceiling CalculatorTiles, mains, cross tees, wall angle and wiresWallpaper CalculatorRolls needed with pattern repeatPaint CalculatorPaint for walls and ceilings, with coats and tin sizesExterior Paint CalculatorHouse walls and gables, with surface textureCladding CalculatorCladding boards, battens and fixings
Guides for this trade
Walls & Finishes
How to estimate plasterboard for a room
Boards, screws, scrim and skim: measure once, count sheets the way installers hang them, and finish with the right consumables.
6 min readWalls & FinishesHow much paint? Coverage, coats and surfaces
Coverage rates on the tin assume perfect conditions. Here is how to adjust for surface, colour change and method so you buy the right amount.
5 min readWalls & FinishesLoft insulation: how thick, and how many rolls?
Why 270 mm is the target, how to top up existing insulation, and what it does to the U-value.
6 min read