How to Install Vertical Blinds | Snapping the Headrail Into Place

Installing vertical blinds involves mounting the brackets, then snapping the headrail into them and hanging the slats. The whole job takes about an hour.

For the full breakdown, see our best Automatic Vertical Blinds guide.

Most people assume installing vertical blinds is a fiddly job that requires a professional. In practice, the process is formulaic: measure, mark, drill, mount, and snap. The trickiest part is getting the bracket spacing and clearance right so the slats can rotate freely. This guide walks through exactly what to do.

What You’ll Need Before You Start

Gather everything before you begin, so you’re not hunting for a screwdriver mid-install. A drill with a pilot-hole bit, a screwdriver, a tape measure, a pencil, and a stepladder cover almost every scenario.

You’ll also need to decide whether you’re doing an inside mount (fitted within the window recess) or an outside mount (on the wall or ceiling above the window). This decision determines your bracket positions, so make it before you start marking anything.

The Step-by-Step Installation Order

These steps work regardless of whether your brackets are top-fix (into the ceiling) or face-fix (into the wall). The sequence stays the same.

1. Mark the bracket positions.
2. Drill pilot holes. Use a drill bit slightly thinner than your screws to prevent the wall from splitting. This matters most when mounting into wood or drywall without a stud.
3. Fasten the brackets. Screw each bracket firmly into place. If you’re using wall plugs, tap them into the pilot holes first.
4. Snap the headrail into the brackets. This step differs slightly depending on the brand. Levolor directs you to fit the top front lip of the headrail into the front part of the spring clip after positioning the bracket. Hunter Douglas says to center the headrail underneath the mounting brackets and push up until it snaps into place. Either way, you’re looking for a firm click.
5. Hang the slats and controls. Insert each louver into its carrier, then attach the valance and control wand or cord. Check that the blind traverses smoothly in both directions.

If you ever need to take the blind down, use a screwdriver to release the headrail from the clips rather than forcing it. A stubborn pull can bend the brackets.

The Clearance Rules That Everyone Misses

Clearance is where most installations quietly fail. The blind looks installed, but the slats won’t rotate fully because they’re hitting a handle or the sill.

• Inside mounts: The blind fits within the recess only if the slats have room to rotate freely. Measure the depth of your recess against the slat width before you commit to this option. You also need at least 1/2 inch of clearance above the sill or carpet so the bottom of the slats doesn’t drag.
• Obstacles near the window:
• Outside mounts: This keeps the headrail clear of the frame itself.

When in doubt, hold the headrail in place before drilling any holes and manually test how far the slats rotate.

Once your blinds are in, you may want to step up to motorized versions. For tips on picking an automatic model, see our roundup of the best automatic vertical blinds on the market.

Child Safety: The Cord Tensioner Is Not Optional

Vertical blind cords and chains present a strangulation risk if left as loose loops. The fix is mandatory hardware: a tensioning device that keeps the chain taut while still allowing it to move freely.

Mount the cord tensioner to the window opening itself for inside mounts, or to the wall for outside mounts. Install it as far from the control mechanism as possible, and use a P-Clip to hold the chain against the frame so it stays taut but slides smoothly. Do this only after the blind is fully secured.

When the installation is complete, test the blind’s full range of motion. If it sticks or drags, check your clearance measurements before adjusting anything else.