Egress Basement Window Installation Cost in Canada 2026

Key Insights: Egress Basement Window Installation Costs

• Casement windows: the most cost-efficient egress option because the full frame opens, so a smaller concrete cut meets code compared to a slider or double-hung that only opens halfway.
• Labour and site access: typically 60 to 70% of the total quote; soil conditions or a narrow side passage can add $500 to $1,500 to an otherwise straightforward project.
• Existing opening vs. new cut: enlarging an existing opening costs $150 to $600 in concrete work; a new cut starts at $800 and can reach $2,000.
• Window well drains: add $500 to $1,500 to the project and are required by many municipalities; some cities offer flood-proofing rebates if you apply before work begins.
• Permits: required in virtually every Canadian municipality for foundation wall modifications; work done without one can cause complications when you sell.

In this guide, you’ll read about:

1. Average Cost for Basement Egress Windows
2. Cost Breakdown to Put in an Egress Window
3. How to Reduce the Cost to Put in an Egress Window
4. When Is a Basement Egress Window Required?
5. Find a Pro for Basement Egress Window Installation on HomeStars
6. Frequently Asked Questions

Average Cost for Basement Egress Windows

The cost to put in an egress window ranges from around $700 to replace a window in an existing same-size opening up to $15,000 or more for a multi-window project with full excavation and structural work. For a single new cut with a standard casement window, window well, and permit, most Canadian homeowners budget $3,500 to $8,000 as of 2026.

Project type	Typical cost range
Replacing a window in an existing opening (no structural changes)	$700 to $2,000
Enlarging an existing opening to meet egress code	$1,500 to $4,000
Cutting a new opening with window and window well	$3,500 to $8,000
Multiple windows (two or more, full installation)	$6,000 to $15,000+

Costs are significantly lower when an opening already exists and only needs to be widened or deepened. The jump to a new cut adds excavation, a lintel to carry the structural load above the opening, and in most cases a window well with drainage, all of which compound quickly.

For broader context on window costs, see our guide to window and door installation costs.

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Cost Breakdown of Putting in an Egress Window

The total cost to put in an egress window depends on several factors, from the type of cut required to site conditions and permit fees. The sections below break down each component so you know where the money goes and where there is room to manage the budget.

Labour

Labour is typically the largest single line item on an egress window quote. A new-cut installation involves concrete cutting, debris removal, framing the rough opening, setting the lintel, installing the window, and finishing the interior. Expect to pay $1,000 to $2,500 for labour alone on a single-window project, with more complex projects going higher.

If the project requires a structural engineer to review the opening, which is common on block foundations or when the cut falls near a load-bearing point, add $500 to $1,500 for the consultation and any required drawings.

Materials

Below are prices for the most commonly used materials on a basement egress window installation. Vinyl is the standard choice for window frames, though material selection, glass specification, and well construction all affect the total.

Component	Typical cost
Vinyl casement window (standard egress size)	$500 to $1,200
Fiberglass or wood-clad window	$900 to $2,500
Steel or polypropylene window well	$150 to $500
Window well drain and gravel bed	$500 to $1,500
Lintel or header (steel or LVL)	$200 to $600
Interior trim and drywall finishing	$300 to $1,000

Vinyl handles moisture well, requires no painting, and costs less than fiberglass or wood-clad. Triple-pane glass adds to the window unit cost but improves energy performance, which makes a practical difference in colder climates.

Window size

Going larger than the minimum measurements set by the National Building Code of Canada increases material costs and the scope of concrete work, but it also brings in more light and makes the space feel significantly less like a basement. Standard egress casement sizes such as 24 by 36 inches or 30 by 36 inches are the most economical to source. Custom dimensions add $200 to $500 to the window unit cost and can extend lead times.

Window type

The window type affects both the unit cost and the size of the rough opening required.

• Casement windows: the most popular and cost-efficient egress option, as the full sash swings open and a standard-size unit meets code with the smallest foundation cut.
• Sliding windows: require a larger rough opening because only one sash moves, so you need roughly double the area to achieve the same clear opening, meaning more concrete cutting.
• Double-hung windows: similar issue to sliders: only half the opening is usable for egress, so both the window and the rough opening need to be larger to comply.

For most basement installations, a casement window is the practical default.

Number of windows

A second or third window does not cost the same as the first. Some costs (contractor mobilisation, equipment, site setup) are fixed regardless of how many windows are being installed. Installing two egress windows in one visit rather than separately typically saves $500 to $1,500 on the total project compared to booking two separate projects.

Site access and excavation

Exterior excavation is required on virtually every new-cut installation. A standard single-window well excavation adds $500 to $2,000, depending on foundation depth, soil conditions, and access. A finished garden, paving stones, or a narrow side yard increases that cost because debris removal is slower and equipment access is more limited.

Buried gas lines, old drainage tile, and large rocks are common surprises. Your pro is required to call before digging to mark utility lines, which is both legally required and free.

Waterproofing and damp-proofing

Improperly sealed windows at the basement level are one of the most common sources of moisture problems in a home, so it’s best to ensure that the opening around your new window is protected against leaks. Basic sealant and flashing around the rough opening is usually included in the installation quote; a more thorough waterproofing treatment of the surrounding wall costs an additional $300 to $1,500 depending on the area and product used.

Required permits for the project

A building permit is required in virtually every Canadian municipality for any work that cuts or modifies a foundation wall. Permit fees typically run $100 to $500, with some cities adding a separate inspection fee of $50 to $200. The permit process also ensures that your lintel sizing and structural work are reviewed, which matters on a home inspection report when you go to sell.

Skipping the permit is not a saving: unpermitted foundation work can be flagged during a sale, require costly remediation, or affect your insurance coverage on related claims.

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How to Reduce the Cost of Putting in an Egress Window

Most of the cost variables on a basement egress window project are set before the contractor arrives: the type of opening required, the window you choose, and how you schedule the work. A few practical decisions made early can reduce the quote without changing the outcome.

• Timing: scheduling egress window work alongside other foundation or basement renovation work reduces mobilisation costs.
• Window type: choosing a casement minimises the concrete cut needed, which is often the most expensive part of the project.
• Existing opening: even a small existing window can serve as a starting point for an enlargement, which is significantly cheaper than a new cut.
• Multiple windows: installing two windows in one visit typically saves $500 to $1,500 compared to booking two separate projects.

When Is a Basement Egress Window Required?

The National Building Code of Canada requires every sleeping room to have at least one operable window that can serve as an emergency escape. This applies to any room being used or finished as a bedroom below grade, whether in a primary home or a secondary suite.

In practical terms, this means:

• Basement bedrooms: any room below grade used for sleeping requires a compliant egress window, regardless of whether the basement is newly finished or has been used as living space for years.
• Secondary suites and basement apartments: every bedroom in a legal suite requires its own egress window. A shared exterior door may satisfy the requirement for the level in some cases, but not necessarily for each individual bedroom, depending on the municipality.
• Legal bedroom designation: a basement room cannot be listed as a bedroom on an MLS listing or advertised as a rental bedroom without a compliant window, which has direct implications for property value and rental legality.

National Building Code minimum requirements

The NBC specifies the following for a compliant egress window:

• Minimum clear opening area: 0.35 m² (3.77 sq ft)
• Minimum dimension in any direction: 380 mm (15 inches)
• Maximum sill height above finished floor: 1,500 mm (59 inches)
• Window well clearance (for below-grade windows): at least 760 mm (30 inches) from the window
• Operation: must be openable from inside without keys, tools, or special knowledge

Provincial differences

Provincial building codes layer additional requirements on top of the national standard. Requirements vary across Canada, so it is always worth checking with your local building department before planning the work. A few examples:

• Ontario: the 2024 Building Code aligns with the NBC on egress dimensions but adds energy performance and fire separation requirements that affect window selection and rough opening details.
• Alberta: the Safety Codes Council requires specific window well drainage standards that can increase project costs depending on existing foundation conditions.
• British Columbia: the province's 2023 housing legislation legalized secondary suites province-wide, increasing demand for egress upgrades in existing basements. The BC Energy Step Code also sets energy performance requirements for new windows that run parallel to egress compliance, so product selection needs to satisfy both.

Note: if your basement has a walkout door that leads directly to grade, your building department may consider the egress requirement satisfied for the level as a whole. Confirm this with your municipality before assuming the window is not needed.

For related costs, see our basement finishing cost guide.

Find a Pro for Basement Egress Window Installation on HomeStars

Cutting a foundation wall is a structural modification, and the results are inside your home for decades. HomeStars connects you with window contractors near you who handle egress window installations, so you can read reviews from other homeowners, compare approaches, and make an informed decision before any work begins. Post your project for free, describe your basement setup (new cut, enlargement, or window replacement), and let interested pros respond with their assessments and quotes.

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Your Common Questions About Basement Egress Window Costs Answered

How long does a basement egress window installation take?

A straightforward replacement with no structural changes typically takes one day. A new-cut installation with excavation, concrete cutting, lintel setting, window installation, and window well usually takes two to three days. Projects with difficult soil conditions, a finished interior, or multiple windows can extend to four or five days. Most pros will give you a realistic timeline when they assess the site.

Do I need a structural engineer for a basement egress window installation?

Not always, but in some situations yes. If you are cutting a new opening in a poured concrete or block foundation, a structural engineer may be required to confirm that the lintel above the opening is adequately sized for the load. Many municipalities require engineering drawings as part of the permit application for new foundation openings. Your contractor should be able to confirm whether an engineer is needed before you apply for the permit.

What is the difference between a window well and a window well drain?

A window well is the curved retaining structure excavated around a below-grade window that allows light in and provides the clearance required for egress. A window well drain is a separate component, typically a perforated pipe set in a gravel bed at the base of the well, that carries rainwater away before it accumulates and forces water into the basement. Many municipalities now require a drain as part of any new window well installation. Some municipalities offer rebates for this work under flood-prevention programs, but you typically need to apply before work begins.

Does adding a basement egress window affect my home's value?

In most cases, yes. A basement bedroom that has a compliant egress window can be listed as a bedroom on MLS and advertised as a rentable room. A basement room without one cannot. In most Canadian markets, the cost of adding the window is less than the difference in listed price between a home with one more legal bedroom. Beyond the financial side, it also brings the room into compliance with the life-safety requirement it was built around. Pros on HomeStars can advise on steps to take so that your egress window installation project positively impacts home value.