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How to Measure for a Replacement Window

Be Precise

If your home’s windows are old and no longer providing the level of performance you want, it might be time for a window replacement project. Depending on the number of windows you need to replace, this project could turn into a significant investment in your home – though it’s one that could pay off in the form of improved energy efficiency and curb appeal. One way you can save time and expense is to do your own measurements for the window contractor you choose so they can simply order your new windows and provide installation.

Accuracy is Key

There are three steps involved in the gathering of proper measurements for your window installation project:

  1. Measure for width – Measure the horizontal distance across the window frame at the top, middle, and bottom. The smallest of the three measurements is your rough opening width. Be sure to measure from the surface of the jambs, not from the trim strips or parting beads.
  2. Measure for height – Measure the vertical distance across the frame on the left, middle, and right from the head jamb to the window sill. Once again, the smallest measurement is the one you should use for the window height.
  3. Measure for depth – There are many types of windows that may be too deep to fit in a typical opening, so this measurement is extremely important. Measure from the outside to the inside of the frame in several locations on the window, and once again use the smallest measurement as your final dimension.

Choose a Window Installation Contractor You Can Trust

Measure for Width

NEWPRO has been providing home improvement services to New England homeowners since 1945 and offers high-performance NEWPRO MAX series replacement windows, which are stylish, durable, and energy efficient. You can choose from three different product levels – EcoMax, SuperMAX, and UltraMax – and customize your windows to fit your preferences. Whichever product line and styles you choose, you can count on our certified technicians to install them with precision.

Contact NEWPRO today if you would like to schedule a free consultation at your New England home to discuss our much-sought-after replacement windows.

June 26, 2019
Energy Efficient Windows,

Featured Testimonials

Siding Replacement Project

The NEWPRO process was fantastic.

They showed us a full 3D rendering of the final result before anything ever got started.

Peter & Jessica
Kingston, MA

Window Replacement Project

Quality of the windows was superior to the others we looked at. Now, our windows tilt in, so it's going to be much easier to clean them.

Pembroke, MA

Pool House Doors Project

Cold stays out in the winter. Cold stays in during the summer.

The best thing I love is the craftsmanship from NEWPRO. You'd never know we had the old door cut out because it was rotted from the New England weather.

Scott Zolak

Windows Replacement Project

The sales guy was very thorough and answered all of my questions. The guys that installed the windows were fantastic.

My heating bills have dropped significantly — by about 30% than what they were before.

Ed Morneau

Whole Home Solutions

Go with NEWPRO like I did, they are my home improvement partners for life.

They've replaced my roof, my front door, 38 windows around my house, my guest bath, and the doors on my pool house.

Scott Zolak

1-Day Bath Install

We totally fell in love with the designs.

NEWPRO really gave us an idea of how beautiful our bathroom could be.

Josh & Daisy
Methuen, MA


Not only will it beautify your home, it will protect it for years to come.

The process is actually very easy. Call NEWPRO — they'll tell you exactly what your home needs.

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Wrentham, MA

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It’s easy to see what makes NEWPRO New England’s go-to home improvement company.

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  • 350k+ Smilesby happy homeowners in the New England area
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NEWPRO is proud to support worthy initiatives in the communities we serve. Through our exceptional products and services, we help those in need make upgrades to their homes that have a meaningful impact on their lives.

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