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Installing Horizontal Blinds

Installing Horizontal Blinds

Horizontal blinds with variable-pitch slats regulate light levels, ranging from gentle filtering to near darkness. Slats are made of aluminum, vinyl, PVC or wood and come in many widths. Blinds are installed two basic ways: mounted inside or outside the window opening. An outside mount makes the window look large because the stack goes above the window. Inside-mounted blinds look trim. Because they don’t overlap the window opening, they admit more light around the edges. Careful measurement is important to ensure that they’ll fit the space.




• Measure all windows for the blinds.
• If you plan to hang aluminum blinds in a nursery, make sure the paint on them is certified lead-free by the 



• If you have young children in the home, consider choosing blinds that use wands instead of rope to open and 
• Keep cords out of their reach by installing cleats or shortening the control close.
• The longer the blinds are, the more difficult they are to raise and lower. Consider installing several 
  narrower blinds rather 



• Consider using the less expensive option of ready made, pre-cut blinds, instead of custom versions, if your 
   windows fall within a certain range of standard sizes.




Step 1

Step 1: Measure the width for an inside and outside mount

A. For an inside mount, measure the width at the top, middle and bottom. Use the smallest figure. Unless specified by the manufacturer, do not measure for clearance. That will be accounted for when the blinds are cut to size. Measure the height at the left and right sides and center. Use the largest figure.

B. For an outside mount, measure to the outside edges of the moulding. Measure the exact height of the window from top edge of moulding to bottom edge or to top of sill if there is one. If blind or shade extends to the floor, deduct at least 1/2" for clearance. You may adjust the length to your preference.


Step 2

Step 2: Install the brackets

Install the brackets

Note that on some units, the same brackets are used for inside and outside mounting. Hold the end brackets (and central bracket if included) in place and mark for pilot screw holes. Use a level to make sure each set of holes is even with the others. Drill the holes for the screws and install the brackets. In wood or wood framing, drill the hole slightly smaller than the screw you’ll use. If you aren't going into wood trim or wood framing, use wall anchors, toggle bolts, or other hardware and follow the directions supplied


Step 3

Step 3: Install the head rail

Install the head rail

Place the head rail into the brackets and lock it in place. If blinds hang long check the directions for removing some of the slats from the bottom.


Step 4

Step 4: Attach the valance and wand

Attach the valance

If the blinds have a decorative valance, attach it as instructed. Also attach the wand for adjusting the vanes.