HOW TO MEASURE FOR SHADES, BLINDS
Step-by-step measuring guide for custom shades, blinds, drapery, inside mount, outside mount, width, height, and depth requirements.
Accurate measurements are essential for custom window coverings. This guide helps you measure windows for inside mount and outside mount shades, blinds, and drapery, so your order can be quoted, produced, and installed more smoothly.
For residential, hospitality, office, and commercial projects, clear measurements help reduce mistakes, improve fit, and support a more efficient ordering process.
INSIDE MOUNT VS. OUTSIDE MOUNT: HOW TO CHOOSE THE BEST FIT FOR YOUR WINDOWS
Before measuring for your shades, start by deciding whether an inside mount or outside mount works best for your space. Each mounting style offers different visual effects, installation requirements, and functional benefits.
BEST FOR:
Clean built-in look, sufficient window depth, attractive trim, square window openings, and a more integrated appearance.
BEST FOR:
Shallow windows, uneven openings, better light coverage, more privacy, or when you want the window to appear larger.
MEASURE THE WINDOW FOR INSIDE MOUNT
STEP 1: MEASURE THE DEPTH
Measure the depth at the top of the inside window casing (from the front of the casing to the glass or back of the jamb). This tells you whether a secure inside mount is possible and whether a flush mount can be achieved. Minimum depth requirements vary by product — please check the depth requirements chart for each shade type before ordering.
STEP 2: MEASURE THE WIDTH
For width, measure the window at three places: across the top, middle, and bottom of the opening. Because window openings can be slightly irregular, take the smallest of these three measurements as your final ordering width. Round each measurement down to the nearest 1/8 inch. The headrail width = ordered width.
STEP 3: MEASURE THE HEIGHT
Measure the window’s length (height) at three places: left, center, and right. Use the largest of these three measurements as your ordering length. Round each measurement down to the nearest 1/8 inch. The total shade length should include the headrail.
Note on Side Gaps
For many inside mount shades, the fabric may be slightly narrower than the headrail to allow smooth operation and avoid rubbing against the window frame. Side gaps can vary by product type, fabric structure, control system, and headrail design.
Inside Mount Requirements for Different Shades with Example (unit: inches)
Inside Mount Options & Ordering Notes
Top Mount (default)
Top Mount (default): The product is mounted at the top of the window jamb. This is the default mounting option when you place an inside-mount order.
Side Mount
Side Mount: If you require side-mount brackets, specify “Side Mount” when ordering. If not specified, the unit will be prepared for Top Mount and side-mount hardware/adjustments will not be applied.
Insufficient depth
If your window lacks sufficient depth: Consider switching to an outside mount or selecting a product designed for shallower reveals.
Frame strength
Check frame strength: Make sure the window casing or jamb is sturdy enough to accept screws and mounting hardware.
MEASURE THE WINDOW FOR OUTSIDE MOUNT
STEP 1: CHECK THE SPACE
Before measuring, ensure the area above your window has enough flat surface space to mount the headrail and brackets securely. The headrail requires at least 2–3 inches of clearance above the window frame for proper installation.
STEP 2: MEASURE THE WIDTH
Measure the exact width of the window frame or trim (from outer edge to outer edge). For optimal light coverage and to minimize light leakage, it is recommended to add 3–6 inches (7.6–15.2 cm) to this measurement. The final width will be your ordering width and includes the width of the headrail.
STEP 3: MEASURE THE HEIGHT
Measure the height of the window from the top edge of the frame or trim to the bottom edge. To maximize light control and coverage, adding 3–6 inches (7.6–15.2 cm) to this measurement is recommended. The final measurement will be your ordering height, including the headrail and desired coverage.
Tips for Outside Mount
Check the Space
Ensure at least 2 inches (5 cm) of flat space above your window frame for bracket mounting. Includes extension brackets for clearing molding or obstructions.
Create the Illusion of a Larger Window
Extending shades beyond the window frame adds visual width and grandeur to any room.
Special Note for Roman Shades
Roman shades require 5–8 inches extra in both width and height for proper coverage and a full look.
COMMON MEASURING MISTAKES TO AVOID
- Measuring only one point instead of three
- Using the largest width for inside mount
- Forgetting to check window depth
- Not adding enough coverage for outside mount
- Ignoring handles, molding, tiles, or other obstructions
- Mixing up ordered size and fabric size
- Not confirming product-specific depth requirements
WHAT TO SEND US FOR A QUOTE
To help us provide an accurate quotation, please share:
- Product type
- Inside mount or outside mount
- Width and height
- Window depth
- Quantity
- Fabric or color preference
- Control option
- Project photos or drawings
- Destination country