What are the considerations for inside mount vs outside mount?

Inside mount means the blind sits inside the window opening, against the frame. It creates a clean, built-in look, but it needs enough frame depth for the hardware and is unforgiving on width because the blind has to clear the narrowest point of an out-of-square opening. Outside mount means the blind mounts on the wall or trim above and around the opening. It is more forgiving on irregular or shallow windows, better at blocking light gaps at the edges, and can make a small window look larger. The tradeoff is that inside mount looks tidier but needs adequate depth and a truer opening, while outside mount handles problem windows and maximizes light blockage but covers more wall and projects farther into the room. When we measure on-site, part of what we are determining is which mount type actually works for each window. Depth, obstructions, handles, sensors, and light-control needs all factor in.