The Velux Roof Windows Estimating Calculator estimates the Materials, Labour and Plant required to fit a roof window.

This Estimating Calculator is linked to the Specification. Therefore many of the items required for the window are specified from the Specification you have chosen.

To complete an estimate in the Velux Roof Windows Estimating Calculator,  you use the picker to select the window, flashing kit, an insulation collar, an underfelt collar, a vapour barrier collar and a window blind and then review the dimensional information.

The combination of resources taken from the Specification and the dimensional information will then calculate the following items automatically:

  1. Frame fixings
  2. Plastering
  3. Decorating

To estimate multiple roof windows of the same size, enter the number of windows when prompted. For example, if you were estimating three 660 x 1180 roof windows, you would enter 3. This multiplies all Materials, Labour and other associated Resources by three and consequently increases the cost threefold.