Most homeowners choose standard window sizes when they have to install new windows or replace their existing ones.They’re easy to find and often more affordable than custom-made windows. Most top quality window brands offer standard sizes for different types of windows. In this article, we’ll review the standard sizes for the most common window types below and share our recommendations for professional installation companies.
Renewal by Andersen
Buy One Window or Door, Get One 40% Off
Pros and Cons
What We Liked
- Features proprietary window frame material that is stronger and more durable than vinyl
- Includes a transferable 20-year warranty on glass and a 10-year warranty on non-glass materials
- Provides full-service window replacement services
Keep in Mind
- Doesn’t sell aluminum, fiberglass, or wood frame windows
- Provides fewer window styles than other brands
Window Styles Offered
Renewal by Andersen offers up to eight window styles, which you can customize to fit your home’s aesthetic. Here is the full list of window styles Renewal by Andersen offers:
- Specialty
- Awning
- Bay
- Bow
- Casement
- Double-hung
- Picture
- Sliding
Survey Insights
- According to This Old House’s 2025 window survey of 1,000 homeowners, Renewal by Andersen was chosen by 16% of respondents—making it one of the most popular window brands alongside Andersen Windows (20.9%) and Pella (11.7%). The average cost per Renewal by Andersen window was $612.18, which falls in the mid-range compared to other major brands.
What Is a Standard Window Size?
Standard window sizes are the measurements of common window openings. Though you can choose custom windows, selecting standard window sizes will make for a quicker and cheaper installation process because you won’t have to wait for the window to be built, and your contractor likely won’t have to do additional prep work.
If you’re wondering how much professional window services cost, we’ve provided the typical price points for replacements, repairs, and window cleanings below.
- According to This Old House’s 2025 window survey of 1,000 homeowners, the average cost per window varies significantly by brand. While the overall average across 17 major brands is $553.84 per window, prices range from budget-friendly options like Harvey at $338.33 per window to premium brands like Ply Gem at $896.67 per window.
What Home Window Size Do I Need?
The size of your window depends on which type you’re installing. Each window type comes in a few standard sizes. Below are the most common types of windows and their standard heights and widths. We’ve also included each window size notation, which is the four-digit number that’s used to identify your specific window size when ordering.
Awning windows open outward and upward. They’re commonly used in bathrooms and kitchens over sinks or countertops. Awning windows come in the following standard sizes:
- 2 feet, 5 inches wide by 1 foot, 8 inches high (2518)
- 2 feet, 9 inches wide by 1 foot, 7 inches high (2917)
- 3 feet, 7 inches wide by 7 foot, 8 inches high (3778)
- 4 feet wide by 1 foot high (4010)
Because bay windows—sometimes called bow windows—are angled, their sizing isn’t as standardized as other types. However, they typically fall between the following ranges:
- 3 feet, 6 inches to 10 feet, 6 inches wide
- 3 feet to 6 feet, 6 inches high
Casement windows are common in bathrooms and kitchens. This is because they open outward to the right or left, similar to a door, increasing ventilation. They come in the following standard sizes:
- 1 foot, 7 inches wide by 1 foot, 4 inches high (1714)
- 1 foot, 7 inches wide by 2 feet, 5 inches high (1725)
- 2 feet, 3 inches wide by 2 feet, 3 inches high (2323)
- 2 feet, 9 inches wide by 2 feet, 9 inches high (2929)
- 3 feet, 5 inches wide by 2 feet, 5 inches high (3525)
Pro Tip: When planning kitchen windows, placement matters as much as size. According to TOH Magazine’s planning guide, “Double-hung windows over sinks are tough to open and close; casements are the best choice when you have to reach over a sink or counter to get at them.”
Picture windows, sometimes called fixed windows, don’t typically open. They’re common in living rooms and kitchens because they increase natural light and provide an outside view. They come in the following standard sizes:
- 3 feet wide by 2 feet high (3020)
- 5 feet wide by 3 feet high (5030)
- 6 feet wide by 4 feet high (6040)
- 4 feet wide by 5 feet high (4050)
- 8 feet wide by 5 feet, 2 inches high (8052)
Single- and double-hung windows are the most common window style in homes. Each type has two sashes—the part of the window that holds the glass in the frame. Only one sash opens in single-hung windows, whereas both sashes open in double-hung windows. Here are the standard single- and double-hung window sizes:
- 2 feet wide by 3 feet high (2030)
- 2 feet wide by 4 feet, 4 inches high (2044)
- 2 feet, 8 inches wide by 4 feet high (2840)
- 2 feet, 8 inches wide by 5 feet, 2 inches high (2852)
- 4 feet wide by 6 feet high (4060)
Pro Tip: According to a recent This Old House survey, double-hung windows remain the most popular choice among homeowners, with 21.54% of respondents selecting them for their window projects, followed closely by sliding windows at 21.60%.
Sliding windows open horizontally, except they slide from side to side instead of opening on a hinge. They’re wider than they are tall and come in several standard window measurements, including the following:
- 3 feet wide by 2 feet high (3020)
- 3 feet wide by 3 feet wide (3030)
- 5 feet wide by 3 feet high (5030)
- 6 feet wide by 4 feet high (6040)
- 7 feet wide by 4 feet high (7040)
Getting a Custom Window Size
If you want a unique design or are replacing windows in a house with uncommon window dimensions, a specialist can take measurements and create the size and shape you want. Be aware that custom windows take longer to order, and the cost to replace these windows is more due to the additional labor to install. Expect to pay roughly 50% more for a custom window.
Top 7 Window Installation Companies
Working with a professional window installation company can reduce your chances of making costly mistakes. Below are our picks for the top window installation companies based on 400+ hours of research and interaction with window companies:
- Renewal by Andersen: Most Hands-Free Install
- Champion Windows: Best Financing and Discounts
- Power Home: Most Customizable
- Castle Windows: Best Warranty
- Milgard Windows: Best Fiberglass Windows
- Marvin Windows: Most Innovative Windows
- Harvey Windows and Doors: Best Custom Hardware
Our Conclusion
Buying common window sizes makes window installation and replacement easier and more affordable for homeowners. While some older homes have uncommonly sized windows, most new homes have the standard window sizes listed above. To figure out which size you need, measure your window opening and look for the corresponding size notation online or in-store. We recommend hiring a licensed window specialist to help you determine the best window size for your home improvement project if you have limited DIY window installation experience.
- According to our 2025 survey of 1,000 homeowners who purchased windows, 31.4% hired professional installers specifically to ensure correct installation, while 24.9% cited safety concerns as their primary reason for choosing professional help over DIY.
FAQ About Window Sizes
Are there standard window sizes for replacement windows?
Yes, there are standard sizes for replacement windows. Window manufacturers make various window types in standard sizes, and most new homes have standard-sized window openings. You may have to order custom windows if you live in an older home.
What is the size of a typical bedroom window?
The typical bedroom window is single- or double-hung. Standard single- and double-hung window sizes range from 2 feet by 3 feet to 4 feet by 6 feet.
What are standard sliding window sizes?
Standard sliding window sizes are 3 feet by 2 feet, 3 feet by 3 feet, 5 feet by 3 feet, 6 feet by 4 feet, or 7 feet by 4 feet.
What is a standard window rough opening?
A standard window rough opening is half an inch larger than the actual size of the window. You can add half an inch to the standard window sizes listed in this article to get the rough opening size.
