blog image

Unlocking the Mystery of Standard Window Sizes

April 05, 20244 min read


So, you've decided it's time to replace a window in your home. Easy, right? Just hop online, order a small, medium, or large window, and you're good to go. Well, not quite. Unlike your morning coffee order, windows don't come in a simple set of sizes like tall, grande, or venti. The world of windows is a bit more complex, with a vast array of sizes, styles, and materials to navigate. But fear not, we're here to shed some light on the subject and help you understand standard window sizes and measurements.


What Exactly is a Standard Window Size?

Let's start with the basics. When we talk about standard window sizes, we're referring to the most common measurements for windows. You might be familiar with the concept of a 2x4 in lumber lingo—that's a standard size for wood. But windows are a different ballgame altogether.


So, is there a one-size-fits-all standard window size? The short answer is no. Windows come in a multitude of shapes and sizes, including custom options. However, each style of window typically has its own set of standard sizes that are commonly used across various home designs. While these standard sizes can provide a helpful starting point, it's essential to remember that there can be variations between different brands and manufacturers.


How to Decode Window Sizes?

Understanding window sizes involves speaking the same language as manufacturers. When discussing window size, it's crucial to note that you'll always state the width first, followed by the height. Window size is typically expressed as a four-digit number, with the first two digits representing the width and the second two digits representing the height. For example, if you need a window with a width of 3 feet 8 inches and a height of 2 feet 2 inches, the window size would be noted as 3822.


It's important to be aware that the measurements labeled on the window may not match the actual dimensions. Manufacturers often trim a small amount from both sides of the physical window to ensure a proper fit during installation.


Standard Sizes for Different Types of Windows

While window sizes can vary significantly, there are typical ranges for different types of windows. Let's explore some common window styles and their standard size ranges:


Standard Bedroom Window Sizes:

Most bedroom windows are either double- or single-hung windows, with dimensions typically falling within the range of:

Width: 24” – 34”

Height: 36” – 62”

Fasada Windows and Doors

Casement Window Sizes:

Casement windows, which open outward on a hinge, generally have the following dimensions:

Width: 14” – 36”

Height: 30” – 78”

Fasada Windows and Doors

Double-Hung Window Sizes:

The most common type of window in modern homes, double-hung windows, typically range in size as follows:

Width: 24” – 48”

Height: 36” – 72”

Fasada Windows and Doors

Sliding Window Sizes:

Similar to double-hung windows but opening horizontally, sliding windows commonly come in these dimensions:

Width: 36” – 84”

Height: 24” – 60”

Picture Window Sizes:

Picture windows, known for their expansive views and abundant light, typically have the following size ranges:

Width: 24” – 96”

Height: 24” – 62”

Fasada Windows and Doors

Bay Window Sizes:

Bay windows, often featuring multiple panels, have dimensions that encompass the entire width and height:

Width: 42” – 126”

Height: 36” – 78”

Other Key Window Measurements

In addition to the overall window size, several other measurements are essential to consider:

Window Frame Thickness: This depends on factors such as the material of the frame and the home's location, with typical ranges for wooden, aluminum, and uPVC frames.

Window Glass Size and Thickness: Window glass thickness varies depending on the type of glass and the number of panes, with options for single or double strength.

Window Screen Sizes: Unlike windows, screens come in standard sizes such as 18” x 14”, 18” x 18”, and 20” x 20”, though custom sizes are also available.

Navigating the world of standard window sizes may seem daunting at first, but armed with this guide, you're well-equipped to tackle your window replacement project with confidence. Whether you're in the market for a cozy bedroom window or a grand picture window to frame your view, understanding standard sizes and measurements is the first step towards finding the perfect fit for your home. And if you need further assistance, don't hesitate to reach out to professionals like Fasada Windows and Doors for expert guidance and personalized solutions tailored to your needs.

Window size guideStandard window dimensionsWindow size chartCommon window sizesUnderstanding window measurementsChoosing window dimensionsWindow sizing tipsStandard window dimensions chart
Back to Blog


With 25 years of expertise in the GTA, Fasada is your premier solution for window and door needs in Oakville. Bid farewell to issues like rot, drafts, and unreliable installations. Our high-quality products and expert installation guarantee a seamless experience. Whether upgrading your existing home or enhancing a new one, Fasada is the smart choice. Explore our Oakville showroom for attractive, functional, and secure windows and doors, complemented by cozy window coverings for every room."

2512 Old Bronte Rd unit 4, Oakville, ON L6M 4J3, Canada

Oakville | Waterdown | Stoney Creek

Dundas | Ancaster | Milton | Hamilton | Burlington

Unit 4 – 2512 Old Bronte Rd. Oakville, ON L6M 4J3

Call Us Today: (905) 827-3331

Send us a Message

Unit 4 – 2512 Old Bronte Rd. Oakville, ON L6M 4J3

Call (905) 827-3331



Copyright 2024 . All rights reserved