Measuring guide for windows

Before you proceed, please double check your measurements carefully. All manufacturing sizes must include a cill, and in line with the G.G.F (Glass and Glazing Federation) guidelines recommend you measure:

• Width, from outside, brick-to-brick, at the bottom, middle and top of the opening. Please supply the smallest dimension minus 1cm (10mm) to allow for fitting tolerance.
  
• Height, from outside, brick-to-brick, at the left-hand side, middle and right-hand side of the opening. Please supply the smallest dimension minus 1cm (10mm) to allow for fitting tolerance.