Volume Calculators
Sizing up your project
Are you thinking of adding an extension or making changes to the roof space of your home? Try out our volume calculators to work out the cubic metres of the space to get your project started. Select the appropriate volume calculator for your project below.
Dormer window — flat roof
Calculations needed for a dormer window with a flat roof structure.
Lean-to — single pitch roof
Calculations needed for adding a Lean-to on a structure with a single pitched roof.
Pitched roof — one end hip
Larger structure require a more complicated calculation. One end hip.
Pitched roof — two end hips
Larger structure require a more complicated calculation. Two end hips.
Pitched roof — two end gables
Complete structure require a more complicated calculation.