What Is an Egress Window?
An egress window is a standard window that complies with specific size and operational requirements to serve as an emergency exit. These windows are critical for safety, ensuring occupants can escape or first responders can enter during emergencies like fires. Egress windows are not a special type of window—they are simply standard windows that meet building code size requirements.
When Are Egress Windows Required?
Egress windows are mandated by building codes in certain areas of the home to ensure safety:
Bedrooms: Every bedroom must have at least one egress window.
Basements with Sleeping Areas: Any basement containing a sleeping area must include a code-compliant egress window.
Habitable Attics: Attics used as living spaces also require egress windows.
In new construction, architects and builders plan for these requirements as part of the design. However, during remodels or window replacements, older homes may not have windows that meet modern egress standards. This often requires re-sizing or custom solutions to bring the home up to code.
What Are the Requirements to Meet Code?
The International Residential Code (IRC) specifies the following minimum requirements for egress windows:
- Minimum Width: 20 inches
- Minimum Height: 24 inches
- Minimum Clear Opening: 5.7 square feet (5.0 square feet for ground-level windows)
- Maximum Sill Height: No more than 44 inches above the floor
- Ease of Operation: Windows must open without tools or keys.
If an egress window is installed under a deck, porch, or overhang, there must be at least 36 inches of clearance for unobstructed access.
These standards ensure the window is large enough for someone to crawl through and, in many areas, accommodate a firefighter with their equipment.
In Massachusetts, the State Building Code provides specific allowances for double-hung windows used as emergency escape and rescue openings, which differ from the International Residential Code (IRC) standards. According to the Massachusetts State Building Code, double-hung windows are permitted to have a minimum net clear opening of 3.3 square feet, with minimum clear opening dimensions of 20″ x 24″ inches in either direction.
This adjustment allows certain window sizes, such as a 30-inch by 52-inch double-hung unit, to meet egress requirements. However, it’s important to note that this exception applies specifically to double-hung windows. Casement windows and other types must adhere to the standard IRC requirements, which typically mandate a net clear opening of 5.7 square feet, with minimum dimensions of 20 inches in width and 24 inches in height.
What’s the Difference Between an Egress Window and a Regular Window?
There’s no special category of “egress windows.” Any standard window can serve as an egress window if it meets the size and operational requirements outlined by building codes. The distinction lies in compliance:
- Egress Windows: Must be sized and installed to meet specific safety and accessibility standards.
- Regular Windows: May lack the required dimensions or functionality for use in emergencies.
For example, window styles like casement, slider, and double-hung can all function as egress windows when designed to meet code specifications:
- Casement Windows: These are a popular choice for egress windows because they swing open fully, providing maximum clear opening space. They’re particularly useful in smaller openings or tight spaces.
- Slider Windows: These offer a sleek, modern look but often need larger dimensions to meet egress requirements due to their horizontal sliding operation.
- Double-Hung Windows: A traditional option where both sashes open. To qualify as an egress window, double-hung styles often require larger dimensions to meet the necessary clear opening area.
- Custom Windows: When existing openings or layouts are unique, custom egress windows can provide tailored solutions that meet code and match your home’s aesthetic.
Pro Tip: If you live in an older or traditional-style home with double-hung windows, consider replacing one with a casement window. To maintain a cohesive look, add a simulated check rail to give the casement window the appearance of a double-hung window, ensuring it meets egress standards while preserving your home’s style.
By selecting the right window style and ensuring it meets code, you can create a safer home without sacrificing functionality or design.
Ready to Replace Your Windows?
If you’re planning a remodel or replacing older windows, ensuring they meet egress requirements is crucial for both safety and compliance. Homes with non-code-abiding windows may require resizing or installing custom solutions to meet modern safety standards.
When it’s time to upgrade, JB Sash provides expert guidance and high-quality window and door solutions. We’ll ensure your project meets egress requirements while delivering energy efficient, safe, stylish and functional windows for every room in your home. Contact JB Sash today to schedule a consultation or visit our showroom to explore your options.
