What sizes are available for skylights?

Roof windows – standard or customised?

Roof windows are available as standard windows and made to measure. The typical residential roof windows move within a size grid (matrix). Skylight window sizes are given according to the outer dimension of the frame. Any insulation installed is not taken into account in the measurements.

Example: The roof window is specified with an external dimension of 114 x 140 cm. Due to an all-around, 3 cm thick PU insulation on the outside of the frame, the roof window has dimensions 120 x 146 cm.

The widths of the roof windows in the standard range start at 54 cm and end at 134 cm. The length dimensions (height) start at 78 cm and end at 180 cm. Not all width/length combinations are possible.

FAQ overview