windows shades in Sunnyvale, CA

Determining the size is an important first step when you are in the market for windows shades in Sunnyvale, CA. It ensures that the shades work well and look exactly like your imagination.

Taking the measurement might be tricky, but we are here to help. This guide will discuss how to measure for inside-mount and outside-mount shades.

What is Inside and Outside Mount?

Before taking the measurements, you should know where you want to mount the shades. Inside mount is inside the window frame, and an Outside mount is outside the frame.

There are advantages and disadvantages to both. Here is a quick rundown.

Inside mount: requires window that is at least three inches deep

  • Creates a clean, elegant look
  • Showcases gorgeous window trim or molding
  • Allows hanging of drapes outside the window
  • Ideal for windows without much wall space around them

The main disadvantage is it requires precise measurement and is pretty unforgiving of errors.

Outside mount: doesn’t require window depth

  • More flexible with measurements
  • Makes a window appear larger
  • Great at blocking out light

The only disadvantage is it conceals the window trim. Not great for homes with nice window frames.

How to Measure for Inside Mount Window Shades

Get a measuring tape, a piece of paper, and a pencil (or pen) to write down your measurements. If necessary, get a ladder or step stool.

Also, measure in inches, measure every window, and measure the width first and length second.

Now, follow these steps:

For Width

Measure from the left side to the right side of the window. Record your measurement in the top, bottom, and middle.

If the measurements are not the same, use the smallest size or round down to the nearest ⅛” measurement.

For Height

Measure from the top of the window to the window sill. If the window does not have a sill, measure to the point you want the shades to reach.

Record your measurement in three places: left, middle, and right. If the dimensions are not equal, use the lengthiest of the three.

For Depth

Measure the depth of the flat surface of the upper casing. It should be, at minimum, three inches deep.

If it is not, you may need to consider an outside mount.

How to Measure for Outside Mount Window Shades

To measure for outside mount shades instead, measure for:


Measure the area you want the shade to cover. To guarantee complete privacy, make sure the measurement is at least 3 inches past either side of the window.

Remember to measure in three places (top, bottom, middle) and use the smallest measurement or round up to the nearest ⅛”.

windows shades in Sunnyvale, CA


Based on where you want to place the headrail (at least 3 inches above the window), measure from there to the window sill or where you want the shades to hang down.

TIP: When measuring for outside mount window shades, it is better to have an extra length than a shorter length.

Alternatively, you could reach out to an expert. We know taking the correct measurements can be challenging, but that’s part of what we do as Sunnyvale, CA, window shades providers. Schedule a free in-home consultation with us today online, call us, or visit our office today.