How to Install Roman Shades on Bay Windows

White Roman shade on a window
What You'll Need
Metal self-locking tape measure
Pencil and notepad
3 Roman shades properly sized, with suitable headers
Installation hardware
Power drill and drill bits
Screw fasteners and supports for the frame material
Screwdriver set
An assistant

The curvature of bay windows lends itself to the rippling effect of Roman shades. Fitting your Roman shades correctly into these deeply inset windows will ensure they look their best and function properly every time. Here are suggestions for how to install roman shades on bay windows to make sure they provide an elegant finish to your room decor.

Step 1 - Measure the Window Bays Carefully

With the tape measure, check the width of each window section in three places: at the bottom, in the middle and at the top. Total and average the measurements, then reduce this average to the nearest 1/8 inch. A slightly narrower shade fits better than one that is too wide. Measure the length of each window bay from the inside frame top to the bottom at the left, center, and right. Average these lengths, and add 1/8 inch. A long shade is preferable to one that is too short. Record these measurements in your notepad.

Step 2 - Purchase Three Matching Roman Shades in the Correct Sizes

You will need to buy three ready-made, order custom-made, or make your own Roman shades in identical fabric and style.

Step 3 - Mark the Placement of Installation Hardware for Each Bay

Start with the largest Roman shade, in the center panel of the bay window. From the edge of the window frame top, measure inward two inches on each side and draw an X on each side of the window frame with pencil. Starting on the left side, have your assistant hold the shade headrail up to the window frame, near the X mark you made before. Draw a horizontal line along the top edge of the headrail, starting at the top left rear corner. This will show where the headrail edge will be. Set the headrail assembly down and measure the distance from the horizontal line to the window glass. Mark this distance with a vertical line that forms a right angle with the horizontal line through the X mark. Measure and mark the other side of the window frame, making sure all measurements are identical so the top of your headrail will be level. Repeat this measuring and marking for each window bay.

Step 4 - Attach the Installation Brackets

Align each installation bracket against the window frame, so one arm is against the window and the other arm sticks out from the top. The edge of the bracket must be at the two-inch X mark and the bracket bend is at the horizontal line marking the headrail top corner. Drill holes for the support screws through the bracket holes, and fasten with screws to stabilize until both brackets are up. Tighten the screw fastenings securely with the screwdriver or drill.

Step 5 - Hang the Roman Shades

Push the headrails into the brackets and tighten the wing nuts to hold the headrails solidly in place. Pull down each shade to test its operation.