Create Custom Window Treatments

Measuring Window Treatments

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Interior Design Workroom & Decor Alteration Studio (303)665-5835
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C Winn Designs Onsite Measuring

We at CWinn Designs pride ourselves on the level of quality and service we provide to all of our clients and customers. If you have a project that you need help measuring then allow us to assist you.

Please feel free to Contact Us or read more on our Onsite Measuring services for Colorado clients within 100 miles of the Denver Metro area.


How to Measure for Window Treatments

What are you trying to measure for?

Measuring for Shades

Inside Mount or Outside Mount?

Decide whether you want your shade to mount to the inside our outside of you your window framing/moulding. Ther are advantages and disadvantages to both styles.


inside mount

Inside Mount Shade

Provide a clean custom look when using the tailored shade styles.

Deeper windows integrate better with inside mounted shades to allow room for mechanics (1 1/2" inside mount space required).

Works best with Flat Roman Shades or shades that have a linear finish. Not recomended for shades with bottoms that have a swagged or bell appearence.

Note: Inside mounted shade not recomended for a window that is not square.

square window

Determine if window is square for an inside mounted shade:

This can be done by measuring from corner to corner (diagonally). So long as the measurments match up the window is square.


Measuring for Inside Mount Shade:

Measure the width and length, inside the moulding, to acheive shade size corredtly. Be sure to double check all measurments.

It is important to note that the width of your shade will need to be atleast 3/8" more narrow, when finished, than the inside of the window framing to allow for smooth opperation. Make sure you communicate you measurments accuratly with C Winn Designs. Provide us exact measurments, we will deduct accordingly to properly fit your shade.


shade outside frame

Outside Mount Shade

Can hide imperfections on the framing/molding of the window. Outside mounted shades also allow you to bring attention to a smaller window or make it appear larger by increasing the overlap.

Works best with any type of shade. Is most appropriate for shades with swagged or bell bottoms.


To Measure:

Start with the horizontal and vertical measurments of the outside of the framing/molding. Then add overlap to the top bottom and sides to satisfy desired look. The more overlap the less likely light will come through.


  • Remember to add atleast 3" of overlap to the top of the shade to account for mechanics and mounting brackets for outside mount. Inside moununt shades are mounted into framing.
  • A template will be needed to custom fabricate any shade with circular or irregular shaped framing.

Measuring for Drapes

Drapes can offer a multitude of asthetic sloutions and functions. Start with these questions to decide:

  • Do I want the drapery to go from the floor all the way to the ceiling?
  • Do I want the drapery to be wider than my atcual window space?
  • Are ther any obstacles (light switches, outlets) that cannot be covered on either side of my window?
  • Taller draperies can add height to a room, and adding width to the drapery can make the window space look wider.

Find out what Dimensions you need to have Draperies custom made installed and installed:

measure window thumb

1. Determine the flat space to be covered by your drapery treatment by measuring the outermost part of your window (some windows have wood framing, or moulding, and some do not) first.

2. Then decide how much wall space above, below, and to the right and left of your window you’d like your drapery to cover.  Measure in several locations for each of these additional factors to ensure that the floor or ceiling is not warped.  Also be mindful of obstacles  (floor vents, ceiling vents, mantels, light switches) when calculating these measurements. It is highly recommended that you allow at least 4 to 5 inches above your window for drapery rods and hardware.

3. When looking at how much space is available to the right and left of your window, keep in mind that when your drapery is open, the fabric will take up between ¼ and 1/3 of the available space.  If you want the window completely uncovered when the drapery is open, you need to allow ‘stacking’ space on either side of your window.

4. Next decide how much fabric, or how full, you’d like your drapery to be.  Standard draperies are made 2.5 times wider than the space to be covered.  Some fabrics have a lot of body and do not need this amount of fullness, conversely, sheer fabrics do need more fullness to drape appropriately across the window. 


  • When deciding on the finished length of your drapery consider the rod you wish to use and how much wall space will be needed to accommodate the hardware.
  • A quick 2D sketch on paper can help you proprotion your project elements and also help you record the measurments you need. Grid paper works great!
  • Please call us for a free quote! Click Here...

Measuring for Valances or Cornice Boards

  • These treatments can add interest to a window or space that may not need full coverage (such as a leaded glass window) with a drapery or shade.
  • There are several shapes and contour lines available that will give depth to simple fabrics.
  • Can give height to the window and the entire space
  • Work best over windows that are at least 4” below the ceiling line

How to measure:

1. Begin by measuring the width of the window from the outer most edges of the framing. Also measure the distance from the top of the window to the ceiling line or crown moulding.

2.It is suggested that cornices and valances be made at least 4” wider than the entire window space so that the window does not look crowded.

3.If you are putting a valance or cornice over a drapery or roman shade, you need to consider the absolute width of your other window treatment.  Valances and cornices need to be at least 4” wider than a drapery treatment to allow for hardware space.

4. If your valance or cornice board is going over an inside mount roman shade, you need to add 4” to your window width from the outside edges of the window framing.

5. To calculate the depth of the valance or cornice board, consider any window treatments that are already present.  Most valances will be at least 3” deep to allow for mounting hardware.

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