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- General Measuring Instructions
- Vienna Shades Measuring Instructions
General Measuring Instructions

Where Do You Want To Mount Your Blind
Before you measure, consider whether you want to mount your window blinds inside the window frame or outside the window on the wall or trim.
Inside or recessed mount hangs inside the window frame. The top of the blind does not project out of the window opening and provides a neater, more finished look without hiding wood trim.
Outside mount hangs either directly on the wood trim or above and outside the wood trim on either side. In either outside mount situation, your wood trim is covered when the blind is closed. Although an inside mount is usually preferred, an outside mount can make a window appear larger, hide unattractive windows or provide total light control.
In addition to personal decorating preference, consider that for an inside mount, your casing or sill must have a minimum depth of 1 ½" for 1" blinds and 2 ½" for 2" blinds to be totally recessed.
How to Measure for Horizontal Blinds
Inside Mount Installation
To find width: Measure exact distance to the nearest 1/8" between inside surfaces of window frame at the top, middle and bottom, and use the narrowest width. Do not make any width deductions since the factory will do so in production. Refer to the specific product page for width deductions.
To find length: Measure exact distance from inside surface at top of window to sill. If you prefer blind not to touch sill, deduct 1/4". If there is no sill, measure length to point where shade is to reach.
Outside Mount Installation
To find width: Measure exact distance to the nearest 1/8" between the outermost points where the blind is to be placed. For optimum light control, this measurement should extend 3/4" beyond the window opening on each side (or 1-1/2" for the entire width).
To find length: Measure exact distance from where top of shade (the headrail that is) will be located to top of sill. If there is no sill or if shade is to overlap window frame, measure to point blind is to reach.
Information provided courtesy of Levolor Home Fashions, Inc. © Copyright 1996-98 Levolor Home Fashions, Inc.
On a very wide windows, we recommend ordering multiple individual blinds, rather than two blinds on 1 headrail (2 on 1) or 3 blinds on 1 head rail (3 on 1) blinds. It is usually less expensive and much easier to install.
How to Measure for Vertical Blinds
Inside Mount Installation
To find width: Measure the opening across the top where the headrail is to be installed from inside of jamb on left to inside of jamb on right. Round the measurement down to the nearest 1/8". Do not make any width deductions since the factory will do so in production. Refer to the specific product page for width deductions.
To find length: Measure from the inside top of the opening on the left, at the center, and on the right to the sill; round the measurement down to the nearest 1/8" and note the smallest dimension. Do not make any allowances: the factory will make all adjustments so the headrail will fit the opening properly and the vanes will clear the sill by 1/4" to 1/2".
Outside Mount Installation
To find width: Measure the width of the area to be covered at the place where the headrail will be installed to the nearest 1/8". Blind should overlap opening at least 4" on each side to ensure privacy.
To find length: Measure the length of the area to be covered and round down to the nearest 1/8". Blind should extend at least 3" above and 3" below opening or window moulding. For ceiling-to-floor installations, make adequate allowance for carpeting. Specifying OB measurement means the factory makes no deduction allowances.
Page provided courtesy of Levolor Home Fashions, Inc. © Copyright 1996-98 Levolor Home Fashions, Inc.
How to Measure for Patio Doors
To find width: Measure the width of the area to be covered at the place where the headrail will be installed to the nearest 1/8". Blind should overlap opening at least 4" on each side to ensure privacy.
To find length: Measure the length of the area to be covered (including the headrail height) and round down to the nearest 1/8". Blind should extend at least 3" above opening or window molding. For ceiling-to-floor installations, deduct 1/2" for proper clearance. Specifying "Outside mount" when ordering means the factory takes no deductions or allowances.
To ensure easy access through the door and allow adequate overlap, consider the stack width. For questions concerning the calculation of stack width, call us at our toll free 1-866-894-LESS (5377).
Information provided courtesy of Levolor Home Fashions, Inc. © Copyright 1996-98 Levolor Home Fashions, Inc.
How to Measure for Cellular Shades
Inside Mount Installation
To find width: Measure exact distance between inside surfaces of window frame at the top, middle and bottom, and use the narrowest width. Do not make any width deductions. Do not make any width deductions since the factory will do so in production. Refer to the specific product page for width deductions.
To find length: Measure exact distance from inside surface at top of window to sill. If you prefer blind not to touch sill, deduct 1/4". If there is no sill, measure length to point where shade is to reach.
Outside Mount Installation
To find width: Measure exact distance between the outermost points where the shade is to be placed. This measurement should overlap each side of the window by at least 1-1/2". Factory makes no deduction from your fabric width dimensions.
To find length: Measure exact distance from where top of shade (the headrail that is) will be located to top of sill. If there is no sill or if shade is to overlap window frame, measure to point blind is to reach.
NOTE: We recommend the top down bottom up feature on doors so that you do not have to release the blind from the hold downs every time you want to raise the shade.
Page provided courtesy of Levolor Home Fashions, Inc. © Copyright 1996-98 Levolor Home Fashions, Inc.
How to Measure for French Doors
The wider and taller you specify your product, the better your privacy, insulation, and light control. We recommend 2" at the top for the mounting brackets and 2" at the bottom for the optional hold-down brackets (so your shade does not come away from the door during door opening and closing). We recommend adding a total of 4" to the length of the door glass opening measurement.
For the width, add at least an inch or two on both sides of the glass. Bring the shade as close to the door handle as possible.
If ordering cellular shades: We recommend the top down bottom up feature so that you do not have to release the blind from the hold downs at the bottom every time you want to raise the shade.
If you have a lever handle on your door: For cellular, pleated and roller shades the blind will usually slip between the handle and the door.
For wood and other horizontal blinds, we recommend changing the door handle to a non-lever variety to avoid damage to the blind.
If your doors have molding around the glass: Be sure to specify spacer blocks for mounting when ordering. The spacers go between the door and the headrail of the blind to avoid unnecessary rubbing on the blind by the molding.
Measuring Corner Windows (By Hunter Douglas)
Butt and Bypass Shades
When two shades butt against each other at a corner, as shown in the overhead views below, one shade is the "butt" shade and the other is the "bypass" shade. Measure for each shade separately using the procedures described for a standard shade, and then subtract headrail depth from the butt shade to obtain the proper ordering width. With outside mounts, remember to allow for overlap on the sides and at the bottom.
Corner Windows when not using Butt and Bypass
Some window fashions such as Stardust cannot use the Butt and Bypass. They are then measured to meet in the corner.
  1. Measure the width of both openings to the common corner.
  2. Deduct the necessary depth of the treatment from the width of each measurement so they will meet in the corner but not overlap. Important: If spacer blocks or extension brackets will be used for extra clearance on outside mounts, add the amount of extra clearance to the deduction.
  3. Order the width less the deduction for each window.
Measuring Bay Windows (By Hunter Douglas)
With bay windows, locations of the window treatment and the ordered width are marked and measured as illustrated below.
  1. Determine the depth of the product you are mounting and use this for the width of your poster board.
  2. Cut two pieces of poster board (depth determined from #1 above) wide by 12" long. Important: If spacer blocks or extension brackets will be used for extra clearance on outside mounts, add the amount of extra clearance to the width dimension of the poster board before measuring.
  3. Place the strips in the left angle first, and bring them together until the front corners of the poster board meet. Mark points "A" and "B".
  4. Repeat this step for the right side angle, marking points "C" and "D".
  5. Measure between points "B" and "C" to obtain the width measurement of the center window treatment.
  6. Measure from point "A" outward to the desired width to obtain the width measurement of the left window treatment.
  7. Measure from point "D" outward to the desired width to obtain the width measurement of the right window treatment.
Measuring Skylight Windows (By Hunter Douglas)
With skylight shades, the procedures for outside mounts are almost the same as for standard rectangular shades.
With inside mount shades:
  1. Measure the width and height inside the window opening in at least three locations each.
  2. If the window opening is longer than 96", measure the width every 48".
  3. Order the shortest height and the narrowest width.
Round your inside mount measurements up to the nearest 11/48", not down as with other inside mounts. The factory deductions take into account the application of compressible foam tape (rail seal) to the outside of the rails.
For fully recessed inside mounts, a 2" minimum mounting depth of the window opening is required. Non-flush mounted inside mounts are not recommended; but, if necessary, a shade may protrude up to 11/42". Note that mounting depths must take into account any obstacles to shade movement, such as window cranks or handles.
Outside mounts require only a 11/42" flat surface for bracket attachment.
In addition to shade measurements, the angle of the window should also be noted on the order.
Measuring Arches, Circles and Quarter Circle Windows (By Hunter Douglas)
With skylight shades, the procedures for outside mounts are almost the same as for standard rectangular shades.
  1. For inside mounts, measure the exact width and height inside the window opening. Do not make any width deductions since the factory will do so in production. Refer to the specific product page for width deductions.
  2. For outside mounts, measure the desired width and height.
  3. Measure the height at its tallest point.
  4. With quarter circles, height will equal width. In perfect arches, height will equal one-half the width.
  5. With imperfect arches, or eyebrows, exact height/width relationships do not occur, so extra care must be taken to ensure a good fit (see below). Please note that a template is required for imperfect shapes.


Vienna Shades Measuring Instructions
Follow the following instructions prior to measuring
  1. Use a steel measuring tape.
  2. Measure to the nearest eighth of an inch - don't round your measurements and do not take your own deductions.
  3. On your notes, clearly indicate which measurement is the width and which is the height. It is very common to transpose measurements. Always indicate the WIDTH measurement first, then the HEIGHT last. (W x H)
    Remember one very important thing when measuring for an inside mount - Take the ACTUAL WINDOW OPENING SIZE to give to us, We will take all the proper allowances for it to fit into that opening. Before taking any measurements, determine if you want to mount the window treatment inside mount (inside window recess), or outside mount (on the wall or molding). See picture below. For an inside mount, the window opening must have enough unobstructed depth to allow mounting. When measuring for an outside mount, be sure to allow for the height of the product's head rail in your measurements. We will custom make your blinds to the sizes you write on the order. If these sizes are incorrect it is impossible to change the blind, so take your time and double check your measurements.
INSIDE MOUNT MEASUREMENT INSTRUCTIONS
WIDTH: Measure the width of the window opening in 3 places (top, middle, and bottom). Take the smallest of the 3 measurements and write it down. This is the width you will order. Do not make any deductions!
HEIGHT: Measure the window opening height in 3 places (left, middle, right) and take the smallest measurement. This is the height you will order. Do not make any deductions.
IMPORTANT NOTE: When you specify inside mount, the factory will make your blind slightly narrower than you specified to allow for operating clearance. The fabric will be 1 1/8" narrower (5/8” on the lift cord side and 1/2” on the opposite side) than the head rail (see picture below). Therefore on all inside mounts you will have a possible light gap on the sides unless there is a window frame, trim, or drapery covering this space.
OUTSIDE MOUNT MEASURMENT INSTRUCTIONS
WIDTH: Measure the width of the window opening from left to right and add 4"to 6" for maximum light gap coverage and privacy. If the shade is to be mounted to trim or framing around the window, measure from the trim's outside edge left to right then deduct 1/4". Keep in mind that on outside mount Shangri-La shades the head rail will measure 3/16" wider than the ordered width and the fabric will measure 3/4" less than the ordered width (see picture below). Once you determine the desired width, write it down. This is the width you will order.
HEIGHT: To determine the height measure the window opening from top to bottom and add 3" to 6" inches to this measurement to allow space for mounting brackets above the opening and enough overlap at the bottom to avoid a light gap. You must add at least enough space to mount the brackets above the window which measure 1 1/4" tall. Once you determine the desired height write it down. This is the height you will order. The factory will make no deductions or additions to your height measurement. If there is trim or framing around the window, measure from the trim's outside edge, top to bottom and this is the height you will order, provided the trim provides the flat space required for an outside mount. If not, you can mount the blind to the wall above the trim. In addition, if the window sill protrudes outside the window opening at the bottom of the window, measure just to the top of the sill then deduct 3/8".
Outside mount shades are mounted outside the window opening and attach either to a wood trim/frame around the window or to a wall. Outside mounts are ideal for windows with little or no window depth. The minimum amount of flat space requires is 3/4” and Mount bracket height is 1 1/4” height.
IMPORTANT NOTE: On outside mounted Soft Sheer horizontal, the fabric will be 3/4" narrower (7/16” on the lift cord side and 5/16” on the opposite side) than the head rail (see picture below). In addition the head rail will measure 3/16" more than the ordered width. You may compensate for the fabric deduction by adding to your width measurement for an outside mount, keeping in mind that the head rail will measure 3/16" wider than the ordered width.
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