The Ultimate Guide to Blinds for Bay Windows

Benjamin Serven | 15 Jun 2015 | Window Treatments

Bay windows can be beautiful. Challenging. Lovely. Difficult.

Ordering blinds for these angular spaces can be a bit intimidating. But few things make a room look polished as much as a well dressed bay window. Today, we’re going to walk you through the “how-to” of bay windows to make this potentially complex window covering a cinch.

Bay windows are defined by a projection from the wall of your house, usually including at least 3 windows. 2 angled windows, and 1 in the middle. The main challenge of bay windows is getting the blinds to fit in the allotted spaces without colliding in the corners.

Need the short version? Depth is important! Choose a blind or shade that takes up a little depth as possible to simplify your installation. Our top 3 product picks for bay windows linked below.

How to Measure Blinds for Bay Windows

Measurements are always an important part of the process, but especially for bay windows. Because the windows are at angles with each other, there are a few more measurements to take into account.


There are a couple of ways that you can hang blinds in a bay window. An inside mount, a partial inside mount, and an outside mount.

How To Measure for Inside Mount Bay Window Blinds

For an inside mount shade, taking your measurements is easy. First, confirm that your window has enough depth to fit your shade by measuring from back to front. Compare this number with minimum fully recessed depth for your particular product. This can be found under the “Measuring and Install Specs” tab on the product page. If your window’s depth is equal to or greater than this number, you have enough depth to mount your blinds flush with the window frame.

Depth requirements do vary between products, so make sure to check to help your window treatment fit perfectly.

measure and install details

Next, measure from left to right in 3 places and choose the narrowest width of your window for the overall width. Lastly, measure from top to bottom in 3 places, and choose the longest measurement for your window height. You’re ready to order!

How to Measure for Partial Inside Mount and Outside Mount

Partial inside mounts are where things can get a little tricky. As you can see in the drawing below, the blinds protrude out into the room but have a small amount of space in between them to allow for the angle positioning.

Check your window depth first. This will determine how your window treatment will be mounted, and what types of products will fit. For example, if you have 2″ of depth, and your blind’s headrail is 3″ deep, then your blind will protrude by 1″. Since the 2 blinds will be protruding at an angle, finding the collision point is key. This is done by first knowing your window depth, then your headrail depth.

To find the collision point, take an index card or another piece of paper, measure it to your window depth, cut to size, and then make another one to match. These will represent the edges of your blinds. Position the forms (A and B)in the window frame as pictured below to find the point at which they collide.

With a pencil, mark on the ceiling the farthest point blind headrail A can extend without intersecting headrail B. A simple line will be perfect. Mark B as well. The lines you’ve drawn will connect and indicate the collision point of the blind. Repeat the process on the other side of the window for blinds C and D.


Now that you have your collision points marked out, it’s time to measure your window width. For the left most blind, measure from the edge of the collision point, to the outer left edge of the window frame(A). For the center blind or blinds, measure the distance between the 2 collision points(B/C). Lastly, for the right most blind(D), measure from the edge of the collision point, to the outer edge of the window frame.

Now, a quick measurement from top to bottom in each of your windows. Make sure to measure on the left, middle and right to find the longest point in the window frame. This will ensure that your window is completely covered.

As with all windows, choose the narrowest width, and the longest height. This will ensure not only that your window is fully covered, but also that your blinds do not collide with each other.

Don’t erase these collision points when you’re finished measuring. You’ll use them again when you install your blinds.

Choosing your Window Treatment Classic Roman Shades

Bay Window Roman Shades

Now that we know the restrictions in your window, it’s time to pick a window treatment. Depth is again an important consideration here. Which ever window treatment you choose, make sure to check what the minimum depth requirements are before you commit to that product.

Second, in order to ensure that the color/pattern is what you want, make sure to order samples. Window treatments are an investment that will beautify and increase the value of your home, so it’s important to choose carefully.

If you want free help from an interior designer, call us at 800-505-1905 and we’ll help you walk through the process of picking the best window treatment for your home

Best Window Treatments for Bay Windows

Most wood blinds, faux wood blinds, roller shades and vertical blinds require more than 3 inches of depth to mount properly in a bay window. Slimmer products like cellular shades and 1″ Blinds are easier to mount and fit more closely together to give you more light blockage and privacy.

Learn more about Bay Window Blinds.

1. Cellular Shades

Bali DiamondCell Shades are one of slimmest cellular shades we carry. With a minimum inside mount depth of 3/4″, this shade will fit in almost no space, and is a perfect choice for a new home with a flush or low depth glass window. Only 1 7/8″ is required for a fully recessed inside mount. This bay window shade option is great for insulation and light filtering as well.

2. Mini Blinds

Bali 1″ Customiser Mini Blinds are a classic and durable, plus they’re the smallest blind we carry. With a fully recessed depth of 1 5/16th’s, and a minimum depth of  3/4″, this blind fits in almost NO space.

3. 1″ Faux Wood Blinds

8313 - No Hts - Pure White - BRW0906_RN101507CA

Many people like faux wood blinds, and 1″ Faux Wood Blinds is a perfect choice for cheap blinds for bay windows. It’s a low profile blind, with just 1″ needed for a partial inside mount. To be fully recessed, you’ll need 1.5″ of space in the window.


Installing blinds in a bay window one of the more challenging installation scenarios, but with our help, you can do it! Because precise alignment is necessary, be patient and give yourself about 2 hours to tackle this project.

Let’s start the installation!

First, we need to position the brackets. Depth is again the key consideration here.

All installations are different, so follow the provided instructions with your blinds. However, what makes bay window installs different is aligning the brackets. We’ll walk you through this process. If you need help, call one of our installation experts at 1-800-505-1905.

Inside Mount


Measure back from the outermost edge of the window in the amount of minimum fully recessed depth. Mark with a pencil, and mount your bracket square with the front of the window.

Partial Inside Mount

Bali 2 1/2" Double Beveled Composite Faux Wood Blids

Measure back from the collision point you have already established outside the window. You will either be mounting your brackets at the very back of your window, or partially forward. Measure back the amount of the minimum fully recessed depth and mark with a pencil. Place the back of your bracket on this mark and align square with the front of the window.

If you don’t have enough depth the fully recess your blinds, place your bracket as far back as you can.

Outside Mount

Bali Solar Shades

For an outside mount, your process will be the same as the partial inside mount, but you will be entirely outside the window. Most outside mounts are mounted directly to the wall, instead of the ceiling like an inside mount. Mark the collision point on the wall above your window rather than inside the frame. Align the outer edge of your bracket with the collision point line.

While an outside mount is possible in a bay window, you must keep in mind that the blinds will stick out from the wall quite far. The window treatments are more apt to collide when raised and lowered, so use an inside mount whenever possible.

Love your new window coverings?

Tell us about it! We love to hear your stories and see your pictures! Still have a few questions? Call one of our expert designers, and they’ll be happy to work with you to complete your window covering project.

  • About Author

    Benjamin Serven is a new member of the PR and Social media team. Chief Pinner, Instagrammer, and Facebooker, he's the social media czar at the B dot C. Concurrently working with our service team, Benjamin brings an in-depth technical knowledge to the social team, and can answer just about any "how-do-I-fix-this" question you may have. Find him instagramming @gentlemanhipster and occasionally on twitter @hungrytoothpick and @BlindsDotCom