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 fenestration solutions across Colorado. As a worker-owned cooperative with 40+ years of expertise, we combine cutting-edge product partnerships with meticulous installation practices to deliver architectural integrity and lasting value. Our in-house team of 26 seasoned professionals with an average tenure of 7 years specializes in full-frame replacements and custom installations for residential and commercial projects. By maintaining complete control over product selection, structural integration, and installation processes, we ensure every project meets exacting performance standards while honoring architectural vision.Our 7-year installation warranty and employee-led service model distinguish us as a trusted partner committed to resolving challenges proactively. With showrooms in Denver, Boulder, and Basalt, we serve luxury single-family residences and commercial clients throughout Colorado's Front Range and Roaring Fork Valley.
Services
New Construction
Window Replacement
Door Installation
Full-Frame Replacement
Custom Solutions
Structural Integration
Product Consultation
Project Management
Energy Efficiency
Service Maintenance
Details
- Year established: 1981
Highlights and features
- We specialize in full-frame replacement for superior energy efficiency and structural integrity
- Our employee-owned team ensures consistent quality and complete project accountability
- We maintain exclusive partnerships with top-tier manufacturers like Marvin and Sky-Frame
- 40+ years of Colorado-specific installation expertise with 33,440 units installed
- 7-year installation warranty covers every project from design to final walkthrough
What people say
Unmatched precision
Fantastic team
Top-notch quality
Seamless installations
Trusted partner
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 precision-engineered products that enhance energy efficiency and architectural aesthetics. With expertise in modern and traditional designs, we ensure seamless integration with structural requirements while maintaining strict performance standards for Colorado's climate conditions.
Full-Frame Replacement
Our full-frame replacement method removes existing windows down to the rough opening for structural assessment and proper installation. This process eliminates air leaks, improves insulation, and maximizes glass area for better natural light. Using nailing fins and through-jamb installation techniques, we guarantee weather-tight seals and lasting performance backed by our 7-year warranty.
Custom Solutions
We specialize in creating customized fenestration solutions that match unique architectural visions. From historic preservation projects to contemporary designs, our team works with premium brands like Marvin and Sky-Frame to deliver products that balance aesthetic appeal with thermal performance. Each solution undergoes rigorous quality checks to ensure perfect fit and function.
Structural Integration
Our installation process prioritizes structural compatibility and long-term durability. By examining rough openings for potential issues before installation, we address water damage risks and reinforce building envelopes. This meticulous approach ensures windows and doors become integral components of the building's structural integrity rather than mere surface treatments.
Product Consultation
We offer expert guidance through our curated selection of premium window and door systems. Our consultants help clients navigate performance specifications, design options, and installation requirements while considering Colorado's environmental factors. With deep product knowledge from partners like Rehme and Reynaers, we ensure optimal selections for both aesthetic and functional requirements.
People
Gwnal Hagan
President
Gwnal Hagan leads Signature Windows + Doors as President with over two decades of industry experience. He oversees strategic direction while maintaining focus on operational excellence and customer satisfaction across Colorado's Front Range.
Ben Anastasio
Chief Operating Officer
Ben Anastasio manages daily operations as Chief Operating Officer, ensuring seamless execution of projects. With extensive construction management background, he maintains quality control standards across all installations and service deliveries.
Bruce Wamsley
Director of Product Logistics
Bruce Wamsley directs product logistics operations, leveraging 15+ years of supply chain expertise. He ensures timely delivery of premium window and door systems while maintaining strict quality control throughout the distribution process.
Melony Sebastian
Director of Business Development
Melony Sebastian leads business development initiatives with a focus on expanding Signature's market presence. Her strategic partnerships with architects and builders have strengthened the company's position in Colorado's luxury construction sector.
Andrew Trigg
Project Manager
Andrew Trigg manages complex installations as Project Manager, applying technical expertise to ensure flawless execution. With 8 years at Signature, he coordinates between design teams and installation crews to maintain project timelines and quality standards.
Questions
What areas do you serve?
We serve Denver, Boulder, Basalt, and the Roaring Fork Valley with showroom locations in Aurora, Boulder, and Basalt.
Do you handle commercial projects?
Yes, we provide premium window and door solutions for both residential and commercial applications across Colorado.
What makes full-frame replacement better?
Full-frame replacement removes old frames completely, allowing structural assessment and eliminating air leaks for superior energy efficiency and durability.
Are your installers employees or subcontractors?
All our installers are direct employees with specialized training, ensuring consistent quality and complete project accountability.
Do you offer warranties?
Every installation includes our 7-year warranty covering both product and installation quality for complete peace of mind.
How do I schedule a consultation?
Contact us at 303-442-4277 or through our website to connect with our consultants and begin your project planning.
Reviews (4)
C. M.
Nov 22, 2017
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We have a 1904 house and are replacing a few windows at a time. Bobby and Gwanael at Signature Windows have been great to us and to our neighbors who recommended them. They have answered our questions, have responded quickly, and worked out follow-through issues with us after our first set of windows was installed. We had Marvin wood windows installed that are fabulous - they honor our historic house and function like a dream (no more drafty bedrooms). Bobby helped us recreate some decorative wood mullions so we wouldn't lose the character of our old windows. The price of windows and installation
Park Hill P.
Jun 01, 2015
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Im having difficulty understanding why this company is still in business. After our experiences with them, I'm positive that we can't be the only customers that feel the same way, so read on and decide for yourself... Our first few discussions with Terry were very positive and reassuring. He has incredible sales skills and knows his products quite well. In fact,our decision to go with solar glass was based purely on the information and experience we had with Terry. We trusted Terry and felt very comfortable with his recommendations and advice. We learned that most people are looking
Ryan C.
Dec 12, 2014
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Recommend replacing Windows and doors from Solarglass! Had all my builders grade vinyl windows and patio doors replaced in my home with Marvin Integrity line. Received another bid for the same windows and the other company was $2000 higher. Boy the difference in sound, heat transfer, and overall look of Windows is very noticeable. Neighbors have already commented how good they look! I agree they are a stand out.
Jason and Oshon were great thru the whole install process and it does show that they really care about their work. They were on time, courteous, and do good work. Another shot out to sales
Jason and Oshon were great thru the whole install process and it does show that they really care about their work. They were on time, courteous, and do good work. Another shot out to sales
Joshua G.
Feb 10, 2012
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Last summer we had Solarglass replace 8 windows on our second floor, as well as 1 on the main floor and 1 in the basement. We worked very closely with Ed, who is incredibly knowledgeable and told me more about windows than I probably ever wanted to know. Though it took a little longer than we had hoped for the windows to arrive from the factory, the work was completed quickly and on time, and very much to our satisfaction. We went for some high-end windows and it was kind of pricey, but 6 months later we haven't had any issues whatsoever. The air leaks, rattles, wind noise, and heat loss
