How to Install Inside-Mount Window Blinds

Window blinds are the simplest way to gain instant control over your home's light and privacy. A clean, professional installation makes a massive difference in how a room feels, transforming a drafty, bare window into a finished architectural feature that complements your decor. Getting it right comes down to measuring twice and choosing the correct mounting method. Whether you are installing wood, faux wood, or aluminum blinds, the secret lies in perfectly level brackets. When you take the time to align your hardware correctly, the blind will operate smoothly for years without snagging or crooked gaps.

1. Measure Three Times, Cut Once. Measure the width of the window frame at the top, middle, and bottom, using the smallest number to determine the width of your blinds. Do the same for the height, ensuring the frame is deep enough to accommodate the mounting hardware.
2. Bracket Alignment Sets Your Success. Hold the brackets inside the top corners of the window frame, approximately 2 inches from the sides. Use a pencil to mark the screw holes, ensuring both brackets are perfectly aligned with each other.
3. Pilot Holes Prevent Splitting. Use a drill bit slightly smaller than your screws to create pilot holes at your pencil marks. This prevents the wood or trim from splitting when you drive the screws in.
4. Level Brackets Equal Level Blinds. Place the brackets over the pilot holes and drive the screws in until firm. Do not overtighten, as this can strip the wood or crack the plastic housing of the bracket.
5. Listen for That Satisfying Click. Slide the blind's headrail into the brackets until you hear a definitive click. If the headrail includes a decorative valance, snap it onto the front of the headrail now.
6. Test, Smooth, Done. Connect the tilt wand or cord mechanism to the hook on the underside of the headrail. Test the rotation to ensure the slats open and close smoothly without obstruction.