Business Details
45 Years
experience
Premium Windows & Doors in Colorado
Founded in 1981 as a workers cooperative, Signature Windows + Doors has built a 40-year legacy of excellence in premium window and door solutions across Colorado. Our deep expertise in fenestration systems, combined with partnerships with globally recognized brands like Marvin and Sky-Frame, enables us to deliver custom residential and commercial projects with unmatched precision. As a Colorado-based company transitioning to employee ownership, we maintain rigorous quality standards through in-house installation teams and a commitment to structural integrity, energy efficiency, and architectural harmony.Our 26 team members with four or more years of experience ensure continuity, while our 7-year installation warranty demonstrates confidence in our workmanship. With showrooms in Denver, Boulder, and Basalt, we serve luxury single-family projects, new construction, and full-home renovations, prioritizing accountability through direct client collaboration from design consultation to final execution.
Services
New Construction
Replacement Windows + Doors
Full-Frame Replacement
Custom Solutions
Energy Efficiency
Details
- Year established: 1981
Highlights and features
- We offer 40 years of expertise in premium fenestration solutions for Colorado properties
- Our in-house installation teams ensure quality control and accountability
- Full-frame replacement method maximizes energy efficiency and structural integrity
- Employee-owned culture fosters long-term commitment to client satisfaction
- 7-year installation warranty demonstrates confidence in workmanship
What people say
Unmatched precision
Energy efficiency improvements
Professional installation teams
Exceptional craftsmanship
Long-term durability
Services
New Construction
We provide comprehensive window and door solutions for ground-up construction projects. Our team collaborates with architects and builders to select and install products that meet exact architectural specifications while optimizing energy efficiency and aesthetic continuity. With expertise in modern and traditional designs, we ensure seamless integration with structural requirements and performance standards.
Full-Frame Replacement
Our full-frame replacement method removes existing windows down to the rough opening for structural inspection and precision installation. This approach eliminates air leaks, maximizes glass area, and ensures lasting performance. We use nailing fins and thru-jamb installation for weather-tight seals while preserving architectural integrity during home modernization projects.
Custom Solutions
We deliver bespoke fenestration solutions matching unique architectural visions. From historic preservation to contemporary designs, our expertise in product selection and installation accommodates specialized requirements. Our partnerships with premium manufacturers like Marvin and Sky-Frame enable customized configurations for both residential and commercial applications across Colorado.
Energy Efficiency
Our energy-efficient window and door systems reduce thermal transfer while maintaining aesthetic appeal. Through full-frame replacements and proper sealing techniques, we enhance insulation performance. We specify products with optimal U-factors and solar heat gain coefficients tailored to Colorado's climate, helping homeowners achieve long-term energy savings without compromising design quality.
Remodeling
We specialize in window and door integration for home remodeling projects. Our team addresses structural compatibility, thermal performance, and design cohesion during renovations. Whether expanding living spaces or updating historic homes, we provide solutions that balance modern functionality with architectural authenticity while maintaining strict installation quality standards.
People
Gwnal Hagan
President
Gwnal Hagan leads Signature Windows + Doors with strategic vision, overseeing operations and long-term growth while maintaining commitment to quality craftsmanship and client satisfaction across Colorado projects.
Ben Anastasio
Chief Operating Officer
Ben Anastasio manages daily operations, ensuring efficient execution of projects while upholding the company's standards for precision installation and exceptional customer service in all Colorado markets.
Bruce Wamsley
Director of Product Logistics
Bruce Wamsley oversees product logistics, maintaining seamless supply chain operations that ensure timely delivery of premium windows and doors to support Colorado's construction and renovation projects.
Melony Sebastian
Director of Business Development
Melony Sebastian drives business growth initiatives, expanding Signature's reach while maintaining focus on premium fenestration solutions tailored to Colorado's architectural landscape.
Andrew Trigg
Project Manager
Andrew Trigg coordinates project execution, ensuring meticulous attention to detail from design consultation through installation for both residential and commercial window and door projects.
Questions
What services does Signature Windows + Doors offer?
We specialize in new construction window and door installations, full-frame replacements, and custom fenestration solutions for residential and commercial properties across Colorado.
Do you serve areas outside Denver?
Yes, we serve Boulder, Basalt, the Roaring Fork Valley, and surrounding Colorado regions with the same quality standards as our Denver operations.
What makes your replacement method different?
Our full-frame replacement removes old frames completely, addressing structural issues and ensuring superior energy efficiency compared to standard insert installations.
Do you offer warranties on installations?
Yes, all installations come with our industry-leading 7-year warranty covering both products and workmanship for complete customer confidence.
Are your installers employees or subcontractors?
We employ our own installation teams to maintain quality control, ensuring consistent craftsmanship and accountability for every project.
Can you handle commercial projects?
Yes, our expertise extends to commercial applications with the same attention to detail and premium product selection as residential projects.
