Choosing the right size for your new single-hung windows involves more than just aesthetics; it’s crucial for proper fit, function, and safety, especially concerning egress requirements for emergency escape.
This guide covers tailles standard de fenêtres à guillotine simple, how to measure, and the important egress code rules you need to know, particularly for bedrooms and basements.
Need a basic definition first? Learn ce qu'est une fenêtre à guillotine simple.
Common Single-Hung Window Sizes
While windows can be custom-made, manufacturers offer many standard sizes that are readily available and often more affordable. Sizes are typically listed as Width x Height (e.g., 3050 means 30 inches wide by 50 inches tall).
Common Standard Widths:
- 24 inches (2′-0″)
- 28 inches (2′-4″)
- 32 inches (2′-8″)
- 36 inches (3′-0″)
- 48 inches (4′-0″)
Common Standard Heights:
- 36 inches (3′-0″)
- 48 inches (4′-0″)
- 54 inches (4′-6″)
- 60 inches (5′-0″)
- 72 inches (6′-0″)
Example Standard Size Combinations:
- 2436 (2030)
- 2848 (2440)
- 3254 (2846)
- 3660 (3050)
- 4872 (4060)
While these are common, many suppliers offer a wide range of dimensions, including custom size single-hung windows if standard options don’t fit your needs.
How to Measure for Replacement Windows
Accurate measurements are essential for ordering the correct size. Measure the existing window opening carefully:
- Largeur: Measure horizontally inside the frame at the haut, milieu et bas. Use the le plus petit of the three measurements.
- Hauteur: Measure vertically inside the frame on the left side, center, and right side. Use the le plus petit of the three measurements.
- Record: Note your measurements as Width x Height.
Rough Opening vs. Window Size: Remember, the actual window unit will be slightly smaller (typically ~1/2 inch less in width and height) than the rough opening in the wall framing to allow for shimming and proper installation. (See our window installation guide).
Understanding Egress Window Requirements (Safety First!)
What is Egress? Egress means a path or way out. An egress window is one large enough to be used as an emergency exit, typically required in chambres et finished basements.
Why Are They Required? Primarily for fire safety, allowing occupants to escape and firefighters to enter.
IRC Egress Code Minimums (Check Local Codes Too!):
The International Residential Code (IRC) generally requires egress windows to meet tous these minimums:
- Minimum Net Clear Opening Width: 20 inches (the actual open space)
- Minimum Net Clear Opening Height: 24 pouces (the actual open space)
- Minimum Net Clear Opening Area: 5,7 pieds carrés (Width x Height of the actual opening). Exception: 5.0 sq ft for grade-floor or below-grade openings.
- Maximum Sill Height from Floor: 44 inches (bottom of the clear opening cannot be higher than this from the room’s floor).
Important: “Net Clear Opening” refers to the actual free space you can climb through when the window is fully open.
Can Single-Hung Windows Meet Egress Codes?
Yes, but careful selection is needed. Because only the bottom sash opens on a single-hung window, the net clear opening height is limited to less than half the total window height.
- Calculation: To meet egress, the open space created when the bottom sash is fully raised must satisfy the 20″ width, 24″ height, AND 5.7 sq ft area minimums.
- Size Implication: This often means a single-hung window needs to be significantly taller than other window types (like casements) to provide the required 24-inch clear opening height.
- Common Egress Sizes?: While a 3050 (36″x60″) pourrait meet egress in some cases depending on the specific frame and how high the sash opens, you must always verify the net clear opening dimensions provided by the manufacturer for the specific window model you are considering. Don’t assume based on overall size alone.
If a standard single-hung window doesn’t meet egress for your bedroom or basement, you may need to:
- Choose a larger single-hung window.
- Select a different window type (casement windows often meet egress in smaller overall sizes).
- Modify the rough opening (a more involved renovation).
Choosing the Right Size: Factors to Consider
- Egress Requirements: Priority #1 for bedrooms and basements. Verify net clear opening specs.
- Existing Opening: Match measurements for straightforward replacement.
- Esthétique: Proportions should suit your home’s style.
- Ventilation & Light: Larger windows offer more of both.
- Efficacité énergétique : Window size and glass package impact performance. (Learn about efficacité énergétique des fenêtres).
- Coût: Standard sizes are typically cheaper than custom. (See window cost factors).
Foire aux questions (FAQ)
- What’s the smallest standard single-hung window?
Usually around 24″ wide x 36″ high (2030), but smaller custom sizes exist. - Can I get non-standard single-hung window sizes?
Yes, many manufacturers and suppliers offer custom sizing. Explore options for ordering custom size windows. - What single-hung size meets egress?
There’s no single answer. A larger window (e.g., 36″ wide x 60″ high or taller) is often needed, but always check the manufacturer’s specific net clear opening dimensions against code requirements (min. 20″ W, 24″ H, 5.7 sq ft area). - Is a 3050 single-hung window egress compliant?
Maybe, maybe not. It depends entirely on the actual clear opening height when the sash is raised. Verify the specific window’s specs.
Conclusion
Single-hung windows come in various standard sizes, offering affordable options for many homes. When selecting sizes, accurate measurement is key for replacement projects. Most importantly, for bedrooms and basements, ensure your chosen window meets local egress code requirements by checking the manufacturer’s net clear opening dimensions.
If standard sizes don’t work or meet egress, consider custom single-hung window sizes or alternative window types. Consulting with window professionals can help ensure you choose safe, compliant, and appropriately sized windows for your home.
