Are you planning for basement renovation, or creating a legal secondary suite, or addition of an extra bedroom to your basement in the Greater Toronto Area (GTA)? You probably heard the term egress window installation requirements. In most of the cases the installation of properly sized egress windows is not only a safety measure, but it is a legal mandate governed under Ontario Building Code (OBC). Failure to install a compliant egress window can result in building permits denials, legal liability and unacceptable living conditions in Brampton, Mississauga, Vaughan or anywhere within the GTA. For the purpose of this blog, we will break down:
- What is an egress window?
- When it is required
- What the building code says
- Installation considerations
- Cost and benefits
What Is an Egress Window?
An egress window is a window designed to provide exit from a room in an emergency situation, especially a bedroom located in the basement or below-grade areas. Its main purpose is life safety to enable occupants to exit the building and first responders to enter the building in the event of an emergency, such as a fire or gas leak. For legal egress window installation, it should have to comply with mandated minimum size and accessibility standards.
When Is an Egress Window Required?
Egress windows are mandatory under Ontario building code in all bedrooms, not just in basement bedrooms. However, the need becomes especially critical when you are:
- Adding a basement bedroom
- Creating an Secondary suit or basement unit
- Undertaking a legal basement renovation
- Applying for building permit
| Situation | Egress Window Required? |
| Basement bedroom | Yes |
| Above-grade bedroom | Yes |
| Basement living room (no bedroom) | Not required (but natural light/ventilation still needed) |
| Legal secondary suite in basement | Yes (for each sleeping room) |
What are the Ontario Building Code (OBC) Requirements?
The OBC Section 9.9.10.1 provides specifications for egress windows in sleeping rooms. Its requirements are as follows:
- Minimum Egress Windows Requirements:
- An unobstructed opening of at least 0.35 m² (3.77 ft²)
- No dimension of less than 380 mm (15 inches) either in height or width
- Must be able to open without tools, keys or special knowledge
- Bottom point of window opening must not be more than 1.5 m (59 inches) above the floor
In the case of a window is placed in a window well, then the well needs:
- Minimum clearance from the window should be no less than 760 mm (30 inches )
- Allows the window to open fully
Failure to meet these specifications eliminates the eligibility of the room to qualify as a legal bedroom, and the suite may be subject to possible inspection failure.
Egress Window Installation Process
A streamline process for egress window installation in Greater Toronto Area is given below:
- Assessing Location
The contractor assesses the location for window placement to meet building code requirements, natural lighting, and emergency access necessities. This is done to ensure optimal positioning for safety as well as functionality.
- Excavating
Where the installation is below the ground, one should dig a window well in order to provide exterior access. Proper excavation allows it to accommodate draining and windows opening.
- Cutting Foundation
A perfect cut is made to fit the window through the concrete or masonry foundation. Special equipment and structural experience is necessary for this step to avoid damage.
- Installing Drainage
There is a drainage system at the bottom of the window well which diverts the water away so that it will reach the foundation.This prevents the water buildup and leaks as well as structural problems.
- Window Framing & Sill Installation
A durable frame and sill is then constructed to keep the new window in place and aligned properly.The framing also covers the window cut and prepares it for installation.
- Installs Egress Window
The selected egress window is tightly fixed in the framed opening. It should open completely, evenly and fulfill all the required dimensions as mandated in the code.
- Sealing & Finishing
For complete insulation and protection against moisture on the exterior and interior all gaps are sealed. The area is then finished by trim, drywall repair and/or landscaping as required.
Cost of Egress Window Installation in the GTA
The cost of an egress window installation in GTA depends on its size, location and materials, among other considerations. An estimated costs is given below:
| Type of Installation | Estimated Price Range |
| Basic Above-Grade Installation | $2,000 – $3,500 |
| Below-Grade with Window Well | $3,500 – $6,000 |
| Structural Modifications Needed | $5,000 – $8,000+ |
Permit costs, engineering drawings, and waterproofing can add to the total.
Benefits of Egress Window Installation
Installing an egress window is a smart solution to ensure the safety, comfort, and value of your home. These windows are regarded as life-saving emergency exits particularly in basement bedrooms. This makes them essential in any legal living area. The installation of an egress window has some practical and monetary advantages in addition to complying with building codes:
- Increased Safety
- More Natural Light
- Better Ventilation
- Increases Property Value
- Rental Income Potential
Final Thoughts
So, if you still have a question such as, “is egress window installation necessary to comply with the building code requirements in the GTA?” The answer is clear: yes, it is.Properly installing an egress window in a basement, a bedroom addition, or a secondary suite is a requirement of legal code. It is also a life-saving asset. It provides additional light and safety to your home as well as adds value to your home and prevents potential legal and financial headaches later on. Consult a licensed contractor at Great Choice Construction to make sure permits mandates, and make your egress window installation stress free.
