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4.3 minutes

How to Measure Windows & Doors

Learn how to take initial measurements of your windows and patio doors to help get a cost estimate for your project.


If you’re considering updating or replacing the windows or doors in your home, measuring your products can provide a starting point for your conversation with a professional and help as you begin shopping for the perfect new product for your project. Follow these easy steps to measure for your tailor-made windows and patio doors.

3 Simple Steps for Measuring Your Windows or Patio Doors

When it comes to measuring your windows or doors for replacement, the three most important things to remember are to measure the width of the product, the product height and then to write both of those measurements down. Record your measurements on our free, handy measurement guide, which you can download here.

Of course, certain products need to be measured differently, so product-specific measuring instructions are below. Follow these instructions to get the most accurate dimensions.

Measuring Awning or Casement Windows

  • Measure the width of your awning or casement window at the base. Extend your tape measure horizontally from jamb to jamb or trim to trim.
  • Measure the height of your casement or awning window. Extend your tape measure vertically from header to sill or drywall to sill.
  • Make sure to capture both width and height measurements of your casement or awning window.

Measuring Sliding, Double-Hung or Single-Hung Windows

  • Measure the width of your single- or double-hung window at the center, where the two sashes meet. Extend your tape measure horizontally from jamb to jamb or trim to trim.
  • Measure the height of your double- or single-hung window. Extend your tape measure vertically from header to still or drywall to sill.
  • Make sure to capture both the width and height measurements of your single- or double-hung window.

How to Measure your Windows or Patio Doors

Measuring Sliding or Hinged French Patio Doors

  • To measure a sliding patio door or hinged French patio door, step outside your home so you're looking at the exterior of your door.
  • Measure the width of your sliding patio door or hinged French patio door at the center. Depending on the style of your home, extend your tape measure horizontally from brick to brick, siding to siding or edge of stucco to edge of stucco.
  • Measure the height of your patio door. Extend the tape measure vertically from the header to the bottom of the door sill, siding to the bottom of the door sill or edge of stucco to the bottom of the door sill.
  • Be sure the capture both the height and width measurements of your sliding patio door or hinged French patio door.

Measuring Entry Doors

  • Measure the width of your entry door at the center. Extend your tape measure horizontally from one end of the door panel to other.
  • Measure the height of your entry door. Extend the tape measure vertically from one end of the door panel to the other.
  • Make sure to capture both the height and width measurements of your entry door.

Getting the measurements of your windows or doors is a good first step in the replacement process. Having this information will provide a foundation as you start to look at the cost of various types of products and set your project budget. But don't worry, a certified Pella professional will confirm measurements and conduct an installation inspection of your home before Pella starts to build your products. Schedule your free in-home consultation when you’re ready to get started.

Published  March 13, 2020

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Pella Corporation

With Pella, you get so much more than stunning windows and doors. Since 1925, we have been a leader in innovation, going beyond requirements to make beautifully designed products you can be proud to own.

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