Business Details
45 Years
experience
Your Trusted Partner for Premium Windows & Doors in Colorado
Since 1981, Signature Windows + Doors has redefined industry standards for premium window and door solutions across Colorado. As a workers cooperative with over four decades of experience, we combine deep product expertise with hands-on installation mastery to serve residential and commercial clients. Our team collaborates with globally recognized manufacturers like Marvin, Sky-Frame, and Rehme to deliver cutting-edge products engineered for performance and longevity. With showrooms in Denver, Boulder, and Basalt, we provide tailored solutions for new construction, whole-home replacements, and remodeling projects.Our in-house installation specialists ensure precision execution through full-frame replacement methods that maximize energy efficiency and structural integrity. Backed by a 7-year installation warranty and 33,440+ units installed over the past decade, we maintain rigorous quality control by employing our own skilled tradespeople rather than subcontractors. Our commitment to employee ownership through an ESOP plan reflects our culture of accountability, technical excellence, and client-centric service that transforms architectural visions into reality.
Services
New Construction
Whole Home Replacement
Remodeling
Full-Frame Replacement
Commercial Solutions
Details
- Year established: 1981
Highlights and features
- 40+ years of specialized expertise in premium fenestration systems
- In-house installation team ensures quality control and accountability
- Full-frame replacement method maximizes energy efficiency and durability
- Partnerships with globally recognized manufacturers like Marvin and Sky-Frame
- 7-year installation warranty covering all project components
Associations and certifications
- Marvin
- Sky-Frame
- Rehme
What people say
Top-notch quality
Fantastic exterior trim
Best windows reviewed
Seamless process
Expert guidance
Services
New Construction
We collaborate with architects and builders to integrate premium windows and doors into ground-up projects. Our team ensures optimal product selection based on architectural style, energy efficiency requirements, and structural demands. From modern energy-efficient designs to timeless traditional styles, we provide solutions that enhance both aesthetics and performance while meeting exact project specifications.
Whole Home Replacement
Our full-frame replacement method transforms existing homes with precision-engineered window and door systems. We remove old frames completely to address structural issues, install new units with nailing fins for secure attachment, and ensure weather-tight seals. This approach maximizes energy efficiency, enhances home comfort, and improves property value through superior product quality and installation standards.
Remodeling
We deliver tailored solutions for space expansions, layout reconfigurations, and modernization projects. Our specialists assess architectural details and performance requirements to recommend products that maintain design integrity while improving functionality. From historic home restorations to contemporary updates, we ensure seamless integration with existing structures using advanced installation techniques.
Full-Frame Replacement
Our proprietary replacement process removes existing windows completely to the rough opening, addressing hidden structural issues before installing new systems. Using laser alignment and through-jamb installation, we achieve perfect fit and weatherproofing. This method eliminates air leaks, maximizes glass area for natural light, and ensures decades of trouble-free operation with superior energy conservation performance.
Commercial Solutions
We provide large-scale window and door systems for commercial buildings with specialized performance requirements. Our team handles complex installations in office buildings, retail spaces, and institutional facilities, ensuring compliance with commercial building codes and energy standards. From product selection to precision installation, we deliver durable solutions that enhance aesthetics and operational efficiency.
People
Gwnal Hagan
President
Leads Signature Windows + Doors with strategic vision, driving growth while maintaining commitment to craftsmanship and customer satisfaction through employee ownership initiatives.
Ben Anastasio
Chief Operating Officer
Manages daily operations, ensuring seamless project execution across residential and commercial sectors while upholding quality standards in product selection and installation processes.
Bruce Wamsley
Director of Product Logistics
Oversees product supply chain management, maintaining inventory of premium brands like Marvin and Sky-Frame to ensure timely delivery for complex projects.
Melony Sebastian
Director of Business Development
Develops strategic partnerships with architects and builders, promoting Signature's unique combination of product expertise and installation excellence across Colorado markets.
Andrew Trigg
Project Manager
Coordinates residential and commercial installations, ensuring adherence to timelines and specifications while maintaining direct client communication throughout project lifecycles.
Questions
What types of window replacement methods do you use?
We specialize in full-frame replacement that removes old systems completely for structural inspection and optimal installation, unlike standard insert methods.
Do you work with both residential and commercial clients?
Yes, we provide premium window and door solutions for both residential projects and commercial buildings across Colorado.
What areas do you serve?
We serve Denver, Boulder, the Roaring Fork Valley, and surrounding Colorado regions with showroom locations in three major cities.
Are financing options available?
We partner with financial institutions to offer flexible payment solutions for large-scale residential and commercial window replacement projects.
What warranty coverage do you provide?
All installations include our industry-leading 7-year warranty covering both product performance and installation quality.
How can I schedule a consultation?
Contact us through our website or visit any of our Colorado showrooms in Denver, Boulder, or Basalt for personalized project planning.
