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PrimeStone Construction Group
PrimeStone Construction Group
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Egress Window

PrimeStone delivers professionally engineered, code-compliant egress window solutions in Colorado.

Egress Window Installation in Colorado

Egress Window

PrimeStone offers comprehensive, professionally engineered egress window solutions:

Egress Window Installation

Structural assessment and engineering guidance
Excavation and foundation wall cutting
Lintel and structural framing designed for safety
Custom window well installation
Waterproofing and drainage improvements
Interior finishing and trim work
Egress Window Replacement & Upgradess

Replacement of non-compliant or aging windows
Enlargement of existing openings for code compliance
Energy-efficient window upgrades
Custom Window Wells & Drainage

Durable steel or composite window wells
Drainage systems to prevent water intrusion
Integrated safety steps or ladders

Because we are structural engineer–owned, all installations are reviewed for structural integrity, proper load paths, and compliance with applicable codes.

Our Process

Site Evaluation & Engineering Review Our team—led by licensed structural engineers—assesses your basement layout, foundation conditions, and structural requirements.
Design & Code Compliance Planning We determine the correct window size, location, well design, and structural modifications to meet IRC egress standards.
Professional Installation Our construction team performs all work according to engineered details, ensuring long-term durability and safety.
Final Inspection & Certification We coordinate inspections and verify the installation is fully code-compliant and structurally sound.
Why Choose PrimeStone for Egress Windows in Colorado?

Structural engineer–owned company ensuring technical accuracy and safe construction
Code-compliant egress window design and installation
Full service: engineering, permits, construction, and inspections
Transparent pricing and detailed scopes of work
Trusted by homeowners, investors, and real estate professionals
Serving the Denver Metro Area and the Colorado Front Range

With engineering oversight, you receive higher-quality workmanship and peace of mind that your egress window meets all requirements.

The PrimeStone Process

How We Install an Egress Window

Six stages from the first measurement to the final inspection.

Step 1Site check & sizingStep 2Permit & plansStep 3Excavating the wellStep 4Opening & structural headerStep 5Window installed & sealedStep 6Well finished & inspected
  1. 1

    Site Check & Sizing

    We confirm the wall, soil, and window size needed so the opening meets egress requirements.

  2. 2

    Permit & Plans

    Engineering details and the permit application are prepared and managed where required.

  3. 3

    Excavate the Well

    The soil outside the wall is carefully excavated to make room for the window well.

  4. 4

    Cut the Opening

    The foundation wall is cut and a structural header is set to carry the load above.

  5. 5

    Install & Flash the Window

    The window is set, sealed, and flashed so the opening stays watertight.

  6. 6

    Well, Ladder & Inspection

    The window well and ladder or steps are finished, and the work is inspected.

Get an Egress Window Quote → 720-468-0686

Structural engineer–owned. Free consultation.

Schedule Your Egress Window Consultation

An egress window is one of the most important upgrades you can make for basement safety and usability.

Contact PrimeStone today for a consultation and a detailed estimate.

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Helpful Guides: Egress Window & Legal Bedroom Guides

Egress Windows as Part of Basement Finishing

Aurora · Castle Rock · Centennial · Highlands Ranch · Lakewood · Thornton · Westminster

Egress Window FAQ

What is an egress window and why is it required?
An egress window is a code-required emergency exit installed in basements or bedrooms to allow safe escape in case of fire or emergency. Colorado building codes and the International Residential Code (IRC) mandate egress windows for any legal basement bedroom.
What are the size requirements for an egress window in Colorado?
To meet IRC standards, an egress window must generally have:
• Minimum net clear opening: 5.7 sq. ft. (5.0 sq. ft. at grade)
• Maximum sill height: 44 inches above the floor
PrimeStone ensures all sizing meets code through structural engineer–reviewed designs.
Do I need a permit to install an egress window?
Yes. Egress window installation requires a building permit because it involves cutting into the foundation wall and modifying structural elements. We handle the entire permitting process, including engineering details and inspections.
How long does it take to install an egress window?
A standard egress window installation typically takes 1–3 days depending on excavation needs, weather conditions, and interior finishing. More complex installations may take longer.
Will cutting into the foundation weaken my house?
Foundation cuts must be engineered correctly. Because PrimeStone is structural engineer–owned, all structural modifications—lintels, framing, load paths, and foundation cuts—are designed and reviewed to maintain the integrity of your foundation.
Do I need a window well with my egress window?
Yes, if the window is installed below grade. Window wells provide space for escape and must meet code for:
• Size
• Ladder or steps (if deeper than 44 inches)
• Drainage
We offer custom steel, composite, or stone-look window well options.
How do you prevent water from entering through the egress window?
We use a combination of:
• Proper grading and backfill
• Waterproofing membranes
• Window well drainage (connected to a drain or sump pump)
• High-quality seals and flashing
Our engineering oversight ensures long-term moisture control.
Can you replace my old basement window with a code-compliant egress window?
Yes. We can upgrade small or non-compliant windows to full egress size, including enlarging the opening, installing new structural framing, and adding a window well if needed.
How much does an egress window installation cost in Colorado?
Costs generally range from $3,500–$8,500+ depending on:
• Excavation depth
• Window and well type
• Drainage requirements
• Interior finishing
We provide detailed, transparent estimates before starting any work.
Can I turn my basement into a legal bedroom after installing an egress window?
Yes. A code-compliant egress window is one of the main requirements for converting a basement space into a legal bedroom. We can also assist with other code compliance needs during your basement remodel.
What makes PrimeStone different from other egress window installers?
PrimeStone is structural engineer–owned, meaning:
• Every foundation cut and structural modification is engineered
• All installations meet IRC and Colorado code requirements
• Safety, durability, and drainage are professionally evaluated
You get higher-quality workmanship and peace of mind that your installation is safe and compliant.

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Need any helps?

Questions about your project? Call us for a free consultation.

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720-468-0686
Email us
info@primestonecg.com