Where to Buy Basement Egress Windows: Types, Prices, and What to Look For

If you’re finishing your basement or converting a room into a legal bedroom down there, one thing you can’t skip is an egress window. It’s not just a code box to check – it’s the window that could let you or a firefighter get in or out during an emergency. So getting the right one, from the right place, actually matters.

This guide walks you through where to buy basement egress windows, what types are available, how much you should expect to spend, and what to look for so you don’t end up with something that fails inspection.

What Is a Basement Egress Window, Exactly?

An egress window is a window large enough to serve as an emergency escape route. The International Residential Code (IRC) sets out the baseline rules most U.S. states follow: the window must have a minimum net clear opening of 5.7 square feet, a minimum width of 20 inches, a minimum height of 24 inches, and the sill can be no more than 44 inches off the finished floor.

For basement windows specifically, if the window sits below grade (meaning it’s underground), it also needs a window well – a reinforced curved or rectangular enclosure dug out around the window to give you clear space to climb out. That well needs at least 9 square feet of floor space and a horizontal projection of at least 36 inches from the wall. If it’s deeper than 44 inches, it needs a permanently attached ladder too.

None of this is optional if your basement has a sleeping room or habitable living space. Most local building departments enforce this.

Types of Basement Egress Windows

Before you figure out where to buy one, it helps to know what you’re shopping for. Not every window style works for basement egress, and getting this wrong means a failed inspection and a redo.

In-Swing Casement (Most Popular for Basements)

This is the most common choice for basements. The sash swings inward on a side hinge, which means the window well doesn’t need to accommodate an outward-swinging sash. Because the full frame opens, a casement can meet egress requirements with a smaller rough opening compared to sliders. A 36″ x 48″ casement typically gives you around 5.7 square feet of clear opening just enough to comply.

The Escape™ Egress Window from Basement Window Systems is a single-hung, in-swing casement built specifically for below-grade installations. It comes with Low-E insulated glass, a screen, and a lock operable from inside without any tools, which is a code requirement. It’s available in multiple sizes to fit block, concrete, ICF, and precast foundations.

Tilt-and-Turn (European Style)

Tilt-and-turn windows are a dual-function design originally from Germany. Turn the handle one way, and the sash tilts inward from the top for ventilation. Turn it further and the whole sash swings in like a casement for full egress. These are growing in popularity for basements because you get ventilation control without fully opening the window every time.

The European Tilt and Turn Egress Window from Basement Window Systems starts at $890 with free shipping and comes in several sizes. The hardware is more robust than a standard casement, which also means better long-term airtightness.

The main trade-off is cost. Tilt-and-turn windows generally run higher than standard casements, and the interior swing clearance needs to be accounted for in tighter basement rooms.

Horizontal Slider

Slider windows move along a horizontal track. They’re low-maintenance – no cranks, no hinges – and bring in a lot of natural light because the frames tend to be wider. The problem for egress purposes is that only half the window opens at any given time. That means to hit the 5.7 square foot clear opening requirement, you need a slider roughly twice the size of a casement that meets the same code. That translates to more concrete cutting, a bigger well, and more excavation cost.

The G70 Series Nail Fin 4040 Slider from Basement Window Systems is designed for nail fin framing attached directly to a pressure-treated lumber frame. It’s a good option if your foundation already has a wider rough opening or if the layout makes a slider more practical.

Sliders work best in basement renovations where you have more wall space and want maximum light, and where the extra excavation cost is already baked into the project budget.

Where to Buy Basement Egress Windows

You have a few different routes here, and each one has its place depending on your situation.

Speciality Online Suppliers (Best for Selection and Code Compliance)

If you want windows that are specifically designed and sold as egress-compliant, a specialty supplier is your best bet. These companies focus entirely on basement egress products and typically list egress compliance details – net clear opening, frame type, foundation compatibility – right on the product page.

Basement Window Systems is one of the more complete sources for egress windows paired with window well systems. They sell egress windows alongside Easy-Well kits, safety grates, polycarbonate covers, and escape ladders – so you can buy the whole system in one place. Pricing starts around $875–$890 for the windows, and shipping is free. They carry all three major egress window styles: in-swing casement, tilt-and-turn, and horizontal slider.

The advantage of going this route is that you know what you’re buying is built for basement egress, not just a window that happens to be the right size. The spec sheets are available, the IRC code documentation is right there in their Resources section, and the sizing information tells you exactly what foundation opening each window fits.

Big Box Home Improvement Stores

Home Depot and Lowe’s both carry egress windows in their doors and windows departments. The selection is narrower than specialty suppliers, and you’ll often need to dig through the product specs yourself to confirm egress compliance rather than it being front and center. That said, if you need something same-day or want to physically see the product before buying, these stores work.

One thing to watch: big box stores often stock standard sizes, and your existing rough opening may not match. Custom sizing, if available at all, adds lead time.

Local Window and Door Dealers

For custom rough openings or specific local code requirements that differ from standard IRC dimensions, a local window dealer can often source the right size and provide installation services. The trade-off is usually higher pricing and longer lead times. That said, if your basement project requires matching existing windows aesthetically or dealing with an unusual foundation type, a local dealer may be worth the cost.

Buy vs. Buy-and-Install

Worth mentioning: buying a window and having it installed are two separate things. The window itself – just the unit – runs roughly $100 to $700 for standard prefab options and $500 to $700+ for custom sizes. Full installed cost including excavation, well installation, concrete cutting, permits, and labor typically ranges from $2,500 to over $6,000 per window depending on location, foundation type, and project complexity.

If you’re doing a straightforward replacement of an existing undersized window, excavation may be minimal and total cost can come in on the lower end. If you’re cutting a new opening into a concrete or block foundation from scratch, budget more.

What to Look For When Buying

Confirmed Egress Compliance

Don’t assume, verify. The product listing should clearly state the net clear opening in square feet when fully open, and it should meet or exceed 5.7 sq ft. This number is different from the window’s rough opening size. A 36″ x 48″ window sounds big, but what matters is the actual unobstructed opening when the sash is fully open.

Frame Type for Your Foundation

Most egress windows come in two frame options: block frame and nail fin. Block frames are designed for concrete, block, or masonry foundations. Nail fin frames attach to a pressure-treated lumber frame and allow for flashing tape and exterior trim – better for wood-framed rough openings or new construction. Getting this wrong means a poor fit and potential water infiltration issues.

Glass Package

Double-pane Low-E glass is the standard for most basement egress windows and handles the bulk of residential applications. Low-E glass reduces heat transfer and UV penetration without heavily tinting the glass, which matters in a basement where you’re trying to bring in as much light as possible. Triple-pane is available but adds cost and weight; it makes more sense in climates with extreme winters.

If the window bottom sits within 18 inches of the finished floor, local codes often require tempered glass. Check with your building department before assuming standard glass is fine.

Operability from Inside Without Tools

This is a hard code requirement and worth double-checking. The window must be fully openable from inside the room using nothing more than hand pressure – no keys, no special knowledge, no tools. Most reputable egress window products meet this, but it’s worth confirming rather than discovering the problem during inspection.

Window Well System Compatibility

If your window is below grade, the window you buy needs to pair with a well that meets code dimensions. Buying the window and well together – as a system – is usually the cleaner approach. Basement Window Systems offers Easy-Well systems paired with egress windows, which take the guesswork out of making sure the well projection and floor area meet IRC requirements.

Egress Window Pricing Overview

Here’s a realistic range of what you’re looking at for different parts of the project:

Window only (material cost):

Standard prefab egress window: $100–$700
In-swing casement (code-focused, ready to install): $875–$890 at basementwindowsystems.com
Custom sizes: $500–$700+

Full installed project cost (window + well + labor):

Basic replacement of existing undersized window: $2,500–$4,000
New opening cut into existing foundation: $4,000–$8,000+
Complex masonry or concrete projects: $8,000–$10,000+

These numbers vary significantly by region. Labour rates in metro areas run higher. Projects requiring structural engineering review add more. Getting two or three quotes from local contractors gives you the most accurate number for your specific situation.

The Window Well: Don’t Overlook It

A lot of people focus on the window and treat the well as an afterthought. That’s a mistake. The well has to meet its own code requirements and plays a direct role in whether the egress system actually works in an emergency.

Wells need to be large enough to give someone room to manoeuvre and climb out. If the well is deeper than 44 inches, a permanently attached ladder is required – not optional, not something you can prop in there temporarily. The well also needs proper drainage so it doesn’t become a water collection point that freezes in winter or floods during heavy rain.

Basement Window Systems sells complete Easy-Well systems made from 18-gauge galvanised steel with a stacked stone or white finish. Pair that with a safety grate and a clear polycarbonate cover, and you have a well that keeps debris out, lets light in, and holds the weight of foot traffic without blocking the window below.

Final Thought

Basement egress windows aren’t a complicated purchase, but they do require getting the details right. The window has to be the right size, installed in the right way, paired with the right well, and meet your local version of the IRC. Buy from a supplier that takes egress compliance seriously, confirm the specs before ordering, and if you’re unsure about local code variations, a quick call to your building department before the project starts saves a lot of headaches later.

If you want to start comparing options, the egress window section at Basement Window Systems has spec sheets for all three window types with sizing details and frame options clearly laid out.