Basement Egress Window Installation

Pennsylvania follows the International Residential Code for egress window requirements, which apply to any basement room used as a sleeping room. 

The code requires a minimum net clear opening of 5.7 square feet, a minimum clear opening height of 24 inches, a minimum clear opening width of 20 inches, and a maximum sill height of 44 inches above the finished basement floor.

Net clear opening refers to the actual usable opening when the window is fully open, not the rough opening or overall unit size, an important distinction when comparing window styles. 

A casement window, which swings fully open on a hinge, typically delivers a larger usable clear opening for a given unit size than a sliding window, making it the more common choice for egress.

Beyond the window itself, code addresses the well: wells below a certain depth require a permanent ladder or steps, and the well needs adequate drainage so it doesn't collect water against the window and foundation. 

Permit requirements and local amendments vary by township across Bucks County, Montgomery County, and Philadelphia, confirm current requirements with your building department; we handle that coordination as part of installation.

Egress window installation cost depends primarily on the foundation material being cut, poured concrete versus block, the depth and size of window well required based on sill height and grade, whether a ladder or steps are needed, and whether drainage needs to tie into an existing footing drain or a new line. 

A shallow well with straightforward access costs less than one requiring deeper excavation or drainage work.

The structural component adds real cost beyond the window unit itself: cutting the foundation opening, installing an engineered lintel to carry the load above it, and waterproofing the cut edges are all part of a code-compliant installation, not optional add-ons. Permit fees, which vary by township, are separate and passed through at the actual municipal rate.

We provide exact pricing after a free on-site evaluation, since foundation type, well depth, and drainage tie-in vary enough between properties that a general number wouldn't reflect your project. Financing options are available. Call (800) 902-5311.

You need an egress window if any room in the finished basement will be used or marketed as a bedroom. 

Code requires a compliant emergency escape and rescue opening in any sleeping room, and without one, that room cannot legally be permitted or represented as a bedroom, regardless of how it's finished.

If the basement won't include a bedroom, a family room, office, or recreation space, an egress window isn't required by code, though many homeowners add one anyway for natural light and a secondary exit. The requirement is tied specifically to the room's use as a sleeping space.

This matters more at resale than most homeowners expect. A basement room used as a bedroom without a code-compliant egress window is a common inspection finding, and it can affect both appraisal and buyer confidence, even if never formally permitted as a bedroom. 

If a bedroom is part of your plan, install the egress window before framing and drywall close in the space, cutting the foundation afterward is far more disruptive. 

See basement finishing for how egress fits into a full project.

Egress window installation typically takes one to two days for the core installation, cutting the foundation opening, installing the lintel, setting the window, and excavating and building the well, though the exact timeline depends on foundation material, well depth, and whether drainage tie-in work is needed. 

Poured concrete takes longer to cut through than block, and a deeper well with a ladder adds time.

This timeline covers physical installation and does not include permit approval, which happens before work begins and varies by township, some municipalities turn around a straightforward egress permit quickly, others take considerably longer depending on current volume and whether additional structural review is required for the lintel design. Build permit lead time into your overall project schedule.

We handle the permit application and inspection scheduling, and we walk through the expected timeline for your specific township during the free on-site evaluation, so there are no surprises about how installation fits into a broader finishing schedule.

Yes, any egress window installed below grade needs a window well, and that well needs proper drainage tied into the home's existing drainage system. 

The well holds back surrounding soil and gives the window room to open to its full net clear opening. 

Without a drain, the well fills with rainwater and snowmelt and sits against the window and foundation, effectively becoming a bathtub against your foundation rather than a safe exit.

The drain needs to tie into the home's existing footing drain, or route to a dedicated line running to daylight or a sump basin, simply backfilling with gravel and hoping water disperses is not adequate, and it's one of the most common mistakes we see from installers who treat the well as an isolated project. 

This is why we approach egress as waterproofing contractors first: we already understand where your home's drainage runs.

A well cover reduces debris and standing water from direct rainfall while still allowing full emergency access, and is required in many jurisdictions. 

Wells below a certain depth also require a permanent ladder or steps, separate from the drainage requirement.