Measure Guide Guide How to measure your windows Accurate measurements are the key to a perfect fit. Follow these simple steps before you order. Grab your tools Use a steel measuring tape (not fabric), a pencil and paper. Always measure in millimetres for accuracy. Choose your mount Decide between an inside mount for a clean, built-in look, or an outside mount for maximum coverage. Measure & record Take width and drop in three places each and record the values. This is where the diagrams below come in. Inside (Recess) Mount Measure the exact width inside the recess at top, middle and bottom.Record the narrowest width — the factory makes deductions.Measure the drop from inside the top to the sill in three places.Check the recess depth is sufficient for the blind bracket. Outside (Face) Mount Measure the window opening width, then add 40–75 mm overlap each side.Measure the desired drop, adding overlap above and below for light control.Ensure there is flat wall or architrave to fix the brackets to.No deductions are made — order the exact size you want the blind to be. Not confident measuring? Our team offers a professional measure-and-quote service. Book a time and we'll take care of the technical details for you. Contact Us