Welcome to our guide to standard window sizes including size charts for popular types and dimensions. Homes that are 30 to 50 years old are typically fitted with standard window sizes that apply to many types and shapes of windows.
Manufacturers have defined measurements for each kind of window in several sizes. However, whether you're shopping for new home windows or replacement windows makes a tremendous difference when ordering.
A new home build has window openings precisely measured and the windows, generally standard sizes, fit in the rough opening with little to no adjustments.
Whereas replacement windows, even if they're standard sizes, may mean more adjustments need to be made to the existing opening. Knowing what to expect before ordering windows saves a lot of time and money for any homeowner.
This guide contains information about standard window sizes and the many variations you may encounter when purchasing windows. Included at the end, is a section on how to measure windows and a handy list of FAQ's.
What Is A Standard Window Size?
When shopping for windows, it's just as important to know the individual sizes of the windows on your home as the manufacturer's standard window sizes.
However, starting with the standard sizes allows a foundation to perform accurate measurements. Today's window suppliers provide a numeric, replacement window size to help homeowners identify the correct windows. This window sizing process is known as the window size notation.
As an example, a standard single hung window that is 2-feet, 9-inches wide, and 3-feet, 4-inches high would include a size notation of "2934." The window size notation includes four numbers; the first two digits represent the width and the second two digits represent the height.
These notations are the manufacture's measurements with an additional ½ inch less or more to provide room for installation. For example, a "4444" size notation represents a window 44-inches wide and 44-inches tall.
The actual measurement may be 43 ½-inches wide by 44 ½-inches high. The ½-inch provides room for flashing materials and ensures the window opens and closes easily.
Another way a window size is noted is with an actual size of 29.5-inches wide and 35.5-inches high and a common size of 30-inches wide and 36-inches high.
The common size is the standard window size and both these sizes may be found in the windows listed specifications and label. Some manufacturers may use their own size notation numbers so always check with the sales clerk before you buy.
Standard Window Width – The most common window is a double hung window, which slides up and down, found on many homes. The width of these windows includes the standard measurements of 24-inches wide, 28, 32, and 40-inches.
Standard Window Height – The same window's standard height includes 36-inches, 44, 52, 54, and 62-inches. (See more in the window size charts below.)
Below are the standard window sizes for the different types of windows. When measuring for custom windows, it helps to begin with these common sizes.
Double Hung Window Sizes
and
Single Hung Window Sizes
WINDOW TYPE
STANDARD WIDTHS
STANDARD HEIGHTS
SIZE NOTATIONS
Double Hung Window Standard Sizes and Single Hung Window Standard Sizes
(They measure the same for standard sizes)
24-in
24-in
24-in
24-in
24-in
24-in
24-in
24-in
36-in
44-in
48-in
52-in
54-in
60-in
62-in
70-in
2030
2038
2040
2044
2046
2050
2052
2060
28-in
28-in
28-in
28-in
28-in
28-in
28-in
28-in
36-in
44-in
48-in
52-in
54-in
60-in
62-in
70-in
2430
2438
2440
2444
2446
2450
2452
2460
32-in
32-in
32-in
32-in
32-in
32-in
32-in
32-in
36-in
44-in
48-in
52-in
54-in
60-in
62-in
70-in
2830
2838
2840
2844
2846
2850
2852
2860
40-in
40-in
40-in
40-in
40-in
40-in
40-in
40-in
36-in
44-in
48-in
52-in
54-in
60-in
62-in
70-in
3430
3438
3440
3444
3446
3450
3452
3460
44-in
44-in
44-in
44-in
44-in
44-in
44-in
44-in
36-in
44-in
48-in
52-in
54-in
60-in
62-in
70-in
3830
3838
3840
3844
3846
3850
3852
3860
48-in
48-in
48-in
48-in
48-in
48-in
48-in
48-in
36-in
44-in
48-in
52-in
54-in
60-in
62-in
70-in
4030
4038
4040
4044
4046
4050
4052
4060
Picture Window Sizes
WINDOW TYPE
STANDARD WIDTHS
STANDARD HEIGHTS
SIZE NOTATIONS
Picture Window Standard Sizes
24-in
24-in
24-in
24-in
24-in
24-in
24-in
24-in
24-in
12-in
18-in
24-in
36-in
48-in
52-in
60-in
72-in
96-in
2010
2016
2020
2030
2040
2044
2050
2060
2080
36-in
36-in
36-in
36-in
36-in
36-in
36-in
36-in
36-in
12-in
18-in
24-in
36-in
48-in
52-in
60-in
72-in
96-in
3010
3016
3020
3030
3040
3044
3050
3060
3080
48-in
48-in
48-in
48-in
48-in
48-in
48-in
48-in
48-in
12-in
18-in
24-in
36-in
48-in
52-in
60-in
72-in
96-in
4010
4016
4020
4030
4040
4044
4050
4060
4080
60-in
60-in
60-in
60-in
60-in
60-in
60-in
60-in
60-in
12-in
18-in
24-in
36-in
48-in
52-in
60-in
72-in
96-in
5010
5016
5020
5030
5040
5044
5050
5060
5080
72-in
72-in
72-in
72-in
72-in
72-in
72-in
72-in
72-in
12-in
18-in
24-in
36-in
48-in
52-in
60-in
72-in
96-in
6010
6016
6020
6030
6040
6044
6050
6060
6080
96-in
96-in
96-in
96-in
96-in
96-in
96-in
96-in
96-in
12-in
18-in
24-in
36-in
48-in
52-in
60-in
72-in
96-in
8010
8016
8020
8030
8040
8044
8050
8060
8080
Single Slider Window Sizes
WINDOW TYPE
STANDARD WIDTHS
STANDARD HEIGHTS
SIZE NOTATIONS
Single Slider Window Standard Sizes
36-in
36-in
36-in
36-in
12-in
14-in
18-in
24-in
3020
3030
3040
3050
48-in
48-in
48-in
48-in
12-in
14-in
18-in
24-in
4020
4030
4040
4050
60-in
60-in
60-in
60-in
12-in
14-in
18-in
24-in
5020
5030
5040
5050
72-in
72-in
72-in
72-in
12-in
14-in
18-in
24-in
6020
6030
6040
6050
84-in
84-in
84-in
84-in
12-in
14-in
18-in
24-in
7020
7030
7040
7050
Casement Window Standard Sizes
WINDOW TYPE
STANDARD WIDTHS
STANDARD HEIGHTS
SIZE NOTATIONS
Casement Window Standard Sizes
12-in
12-in
12-in
12-in
12-in
12-in
14-in
18-in
24-in
30-in
1616
1618
1620
1626
1656
14-in
14-in
14-in
14-in
14-in
12-in
14-in
18-in
24-in
30-in
1816
1818
1820
1826
1656
18-in
18-in
18-in
18-in
18-in
12-in
14-in
18-in
24-in
30-in
2016
2018
2020
2026
2056
24-in
24-in
24-in
24-in
24-in
12-in
14-in
18-in
24-in
30-in
2616
2618
2620
2626
2656
30-in
30-in
30-in
30-in
30-in
12-in
14-in
18-in
24-in
30-in
3016
3018
3020
3026
3056
Bay Window Sizes
The size of the window opening determines how a bay or bow window is configured. Bay and bow windows can be made from casement windows, double hung, and fixed windows. Fixed windows are typically used when the window is just for appearances.
A bay window or bow window that opens is preferred in living rooms, kitchens, and bedrooms for air circulation. Bay and bow windows are sized according to the existing rough opening and made with several sashes.
The difference in standard sizes for bay and bow windows are based on the angle of the windows and size of the three sashes. Typically, the middle sash is ½ the total width of the window and the two side sashes are ¼ the window width.
WINDOW TYPE
TYPE & ANGLE
STANDARD SIZES
Middle Window width and Side Windows width
Projection from Outside Wall
Bay Window Standard Sizes and Projection from Wall
30-Degree 3-sash Bay
36-in
18-in
10 -in
48-in
20-in
11 7/8-in
60-in
24-in
13 1/8-in
72-in
30-in
16 7/8-in
45-Degree 3-sash Bay
36-in
18-in
15 3/8-in
48-in
20-in
16 3/4-in
60-in
24-in
19 5/8-in
72-in
30-in
23 7/8-in
Awning Window Sizes
WINDOW TYPE
STANDARD WIDTHS
STANDARD HEIGHTS
SIZE NOTATIONS
Awning Window Standard Sizes
12-in
12-in
1616
14-in
14-in
12-in
14-in
1816
1818
18-in
18-in
18-in
12-in
14-in
18-in
2016
2018
2020
24-in
24-in
24-in
24-in
12-in
14-in
18-in
24-in
2616
2618
2620
2626
30-in
30-in
30-in
30-in
12-in
14-in
18-in
24-in
3016
3018
3020
3026
Standard Bedroom Window Sizes
Standard bedroom windows sizes are larger than years ago to allow more light and fresh air in the room. There are standard sizes found in new home builds and existing homes.
Below are the sizes and include either single hung windows or double hung windows, the most common types used in bedrooms. Other types of bedroom windows include sliders.
WINDOW TYPE
STANDARD WIDTHS
STANDARD HEIGHTS
Bedroom window Sizes
24-in
36-in
24-in
46-in
28-in
54-in
28-in
66-in
28-in
70-in
34-in
46-in
34-in
62-in
Bathroom Window Sizes
There aren't any tried and true standard bathroom window sizes besides the standard single hung and double hung windows whose size depends on the location and size of the bathroom.
As a general rule standard bathroom picture windows range from 24″ to 96″ wide and 12″ to 96″ high. A standard bathroom sliding window ranges from 36″ to 84″ wide and from 24″ to 60″ high.
Many bathroom windows are associated with privacy meaning small sizes. However, depending on the size of the bathroom, location of the window, and type of window, bathroom window sizes vary. Bathrooms present much less working space than other rooms in a home.
When possible, the largest size window should be chosen for a bathroom to allow more natural light and air flow. If a bathroom is on a second or third floor and is out of view from onlookers or neighbor's windows, a large bay or bow window is a great choice.
Many homes use glass block windows or frosted glass above a jet tub or in a shower providing extra privacy. Typical bathroom windows include single hung and double hung windows.
A great design element in a bathroom is adding several windows such as a horizontal block of transom windows or two single hung windows side-by-side with wall space in between.
Short, wide casement windows are great to add to the upper part of a shower when privacy is needed and a short, wide slider works as well.
Window Sizes Frequently Asked Questions
Should I replace all my windows at once or can I replace a few at a time?
It may save money up front to replace a few windows but it will cost more if the entire house needs windows replaced.
Buying all the windows in one order provides seller discounts and the cost of labor to install the windows is lower when the whole house is done in one job.
In order for the window installers to be at your home, bring the required equipment, and manage work schedules, one complete job costs less.
What season is the best to have replacement windows installed?
Warm weather is always preferred for replacement installation. Once the existing windows are removed, cold and inclement weather poses troubles. If the weather is too hot, such as summers in the high deserts of Arizona, the intense heat will infiltrate your home.
Any extreme temperatures may cause caulking for sealing the windows to not perform well leading to possible air leakage later.
Vinyl and aluminum windows, if exposed to extreme heat or cold, will expand. This may cause gaps between the rough opening and window frame after the temperatures return to a moderate level.
Can I install my replacement windows myself?
If you're a licensed contractor and have plenty of experience, the answer is yes. If you're a DIY homeowner, it's not recommended.
Are Replacement Windows The Same Size As New Construction Windows?
Replacement windows present some challenges new construction windows do not. New home builds mean precut window openings, professional builders, and proper fitting.
Replacement windows involve precise window measurements with the possibility of adjustments once the windows are purchased. The rough opening for new windows includes nailing fins when the window is installed.
Replacement windows, although water tight, do not require or include nailing fins possibly allowing some water infiltration.
Always use replacement windows for existing homes. Once a window is taken out, other elements that are affected include the wall, trim, and siding causing a new construction window to not fit properly.
Replacement windows slide into the existing window space and typically only require some trim adjustments. This ensures a better fit. We've written an article about replacement vs new construction windows here.
How To Measure For Replacement Windows
On the Energy.gov website, the result of improperly fitting windows causing air leaks leads to a large amount of energy loss.
"Heat gain and heat loss through windows are responsible for 25%–30% of residential heating and cooling energy use." (Source: Energy.gov)
Purchasing the right size windows means preventing energy loss and reduces monthly heating and cooling costs.
Measuring for replacement windows isn't as difficult as it may sound but if measurements are wrong, it will cost a high price when the windows you ordered don't fit. If the company you're purchasing the windows from offers free measurement services, let them do the measuring.
If you have to measure yourself, below are the steps to measure for replacement windows.
Check that the windows are square by holding a tape measure on the inside of the window in the top right corner. Pull the tape measure down to the bottom left corner and write down the measurement.Reverse this and measure from the top left to the bottom right. The window is square of the two measurements match or are within ¼-inch of each other. If not square, the frame will need to be adjusted.
Measure the width, not including the window trim, by placing the measuring tape on the left side inside jam and stretching it to the inside of the jam on the right side.Do this for three different spots on the window, middle and near the top and bottom, and use the largest number for the width.
To measure a window's height, extend the tape measure from the sill to the top of the window opening. Do not measure from the trim board. The sill is where the window sash sits when closed.Do this measurement from the middle of the sill, the right, and the left sides. Take the largest number and this is the height of the window.
Always double-check your measurements and if possible, have someone else check them and compare the results.
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