Mounting horizontal blinds that are too narrow Menu

Occasionally blinds are measured incorrectly and they are not wide enough for your window. Manufacturers will typically deduct approximately 1/2" from the specified measurement for proper clearance. If you have ordered blinds that are too narrow sometimes you can still mount them by installing them as a ceiling mount to the top of the window sill. Installation will be similar to an outside mount. You will need the following tools:
  • A hand, electric or cordless drill with a 1/4" nut driver or a slotted screwdriver bit
  • 3/32" drill bit
  • A pencil
Here are some simple installation steps to follow:
  1. Position Headrail
    Mount blinds with slight gap between the window sill and the blind headrail Place blind centered in the window with the brackets and mark with a pencil on the top of the window sill on each side of the blinds headrail. Make sure that the distance from the edge of the headrail to the sides of the window sill are the same on both sides.
  2. Installing the mounting brackets
    Screw the mounting screws through the brackets into the top of the window sill rather than the side. Remember, there will be a slight gap between the edge of the bracket and the window sill.
  3. Install blinds
    Slide the blinds into the brackets and close the hinges.
  4. Install the valance
    Once the blinds are installed you can put the bracket on the blinds with the mounting clips provided. You may want to re-order a new valance to match the exact width of the window so there are no gaps on the sides of the valance.
Was this article helpful?
Free Shipping on Everything
Let Us Help
Live Chat 888.257.1840

6:30 AM–6:00 PM PST Monday-Friday
Closed- Saturday & Sunday
Text/SMS not available on all devices | Data rates may apply

Take Your
We are glad you popped in
Take Your Windows Shopping

Sign up now for insanely amazing inside deals!

    No thanks. I'm closing the window on this opportunity.
    We're serious about your privacy. Learn how we protect it here

    Thanks for Signing Up!

    Check your inbox for something special from


    Let's get started on selecting your new window treatments!

    Questions? Contact Us