Mastering Window Treatment Measurements in 5 Steps

Choosing the perfect window treatments can transform any room, adding style, privacy, and light control. However, the key to a flawless installation lies in accurate measurements. Whether you’re installing blinds, shades, or curtains, knowing how to measure for blinds correctly ensures a perfect fit and a professional look. This guide will walk you through five simple steps to master window treatment measurements, helping you avoid costly mistakes and enjoy your new window coverings with confidence.

Step 1: Understand the Types of Mounts

Before you start measuring, it’s important to decide how you want your window treatments to be mounted. There are two main types:

• Inside Mount: The blinds or shades fit inside the window frame, offering a clean, streamlined look.

• Outside Mount: The treatments are installed outside the window frame, covering the entire window and sometimes part of the wall.

  
  

Each mount type requires different measurement techniques. Inside mounts need precise measurements of the window recess, while outside mounts require measuring the area you want to cover.

Example: If you want to maximize natural light and keep the window frame visible, an inside mount is ideal. For better light blocking or to cover unattractive window trim, choose an outside mount.

Close-up view of window frame for inside mount measurement

Step 2: How to Measure for Blinds Accurately

Measuring for blinds involves three key dimensions: width, height, and depth. Here’s how to get each one right:

1. Width: For inside mounts, measure the exact width of the window recess at the top, middle, and bottom. Use the narrowest measurement to ensure the blinds fit inside without obstruction. For outside mounts, measure the width of the area you want to cover, adding extra inches on each side for better coverage and privacy.

   
   

2. Height: Measure from the top of the window recess to the sill for inside mounts. For outside mounts, measure from where you want the top of the blinds to start down to the bottom of the window or desired endpoint.

   
   

3. Depth: Check the window frame depth to ensure your blinds will fit without sticking out or interfering with the window operation. Most blinds require a minimum depth, so verify this before ordering.

   
   

Tip: Use a steel tape measure for accuracy and record all measurements in inches. Double-check each measurement to avoid errors.

Eye-level view of measuring tape across window width

What is the Standard Length of Window Treatments?

Understanding standard lengths can simplify your selection process. Most window treatments come in standard sizes, but custom options are available for unique windows.

• Blinds and Shades: Standard widths range from 24 to 72 inches, and lengths typically vary from 36 to 72 inches. For windows taller than 72 inches, custom lengths are often necessary.

• Curtains and Drapes: These usually come in standard lengths of 63, 84, 95, or 108 inches. The length you choose depends on whether you want the curtains to hang just below the window sill, to the floor, or puddle slightly on the floor.

  
  

If your window size falls outside these ranges, custom window treatments are the best option to ensure a perfect fit.

High angle view of various window treatments hanging

Step 4: Tips for Measuring Specialty Windows

Not all windows are rectangular or standard size. Specialty windows like arches, circles, or bay windows require extra care:

• Arched Windows: Measure the width at the widest point and the height from the base to the highest point of the arch. Consider custom blinds or shades designed for arches.

• Bay Windows: Measure each window section separately, including the angles between panes. Outside mounts often work best here.

• Skylights: Measure the width and length of the skylight opening. Choose blinds designed for angled installations.

  
  

For these windows, professional assistance or consultation with your window treatment provider can help ensure accurate measurements and the right product choice.

Step 5: Double-Check and Use Professional Services if Needed

Accurate measurements are crucial, but mistakes happen. To avoid ordering the wrong size:

• Measure each window at least twice.

• Write down all measurements clearly.

• Consider the type of window treatment and mounting style.

• If unsure, use a professional window treatment measurement service to get expert help.

  
  

Many companies offer house calls where a specialist will measure your windows and recommend the best treatments. This service can save time, reduce stress, and guarantee a perfect fit.

Final Thoughts on Measuring for Window Treatments

Mastering window treatment measurements is easier than it seems when you follow these five steps. Understanding mount types, measuring width, height, and depth accurately, knowing standard lengths, handling specialty windows carefully, and double-checking your work will help you achieve a flawless installation. Whether you’re updating your home or office, precise measurements ensure your blinds or shades look great and function perfectly.

Taking the time to measure correctly means you’ll enjoy your new window treatments for years to come, with no need for costly adjustments or returns. If you want peace of mind, don’t hesitate to use professional measurement services—they’re an investment in quality and satisfaction.