Blinds.com recommends at least 1.5" of overlap on each side of the window for blinds and shades, and 2" of overlap on each side for solar or roller shades and vertical blinds. The extra width provides more privacy and light blockage. As always, record your measurements down to the nearest 1/8 inch.
Where should inside mount blinds be placed?
Attaching Brackets:For outside mount, the brackets should be placed on the face of the window outline on the two sides of the window. And for inside mount, the brackets should be put up against the inside top corner of each side window.Aug 28, 2017
How much room do you need for interior mount blinds?
As a general rule: 2" horizontal blinds such as faux wood blinds and wood blinds need at least 1.5" inches and 3" for a flush mount. Honeycomb Shades for instance require less space needing just under 1" depth and 2" for a flush mount blind.
How much depth is needed for inside mount roller shades?