Colorado Window & Siding

Our Journey

Colorado Window & Siding (CWSI) has been transforming homes in Colorado since 1983. Founded on the values of honesty, integrity, and exceptional customer service, we're a family-owned and operated business serving Denver, Boulder, and the Front Range.

From humble beginnings in a home office, CWSI has grown into one of the most respected window and siding companies in the state. Founded by Bob and Diana Zimmermann, our journey has been fueled by a passion for delivering quality craftsmanship and personalized experiences.

Our Team

Led by Scott Zimmermann, a third-generation family member, CWSI boasts a team of skilled professionals with decades of experience in the industry. We believe in empowering our employees to deliver exceptional service and ensure your complete satisfaction. Our installers are highly trained and certified, while our office staff is dedicated to handling your inquiries with care and efficiency.

Our Services

CWSI offers a comprehensive range of services to meet your home improvement needs:

Windows

• Wood windows by Weather Shield
• Vinyl windows from trusted manufacturers
• Fiberglass windows for durability and energy efficiency
• Specialty windows for unique architectural features

Siding

• Expert installation and replacement of all major siding materials
• Comprehensive consultation to find the perfect solution for your home

Doors

• Stylish and secure patio doors, including hinged and sliding options
• Quality entrance doors that enhance security and energy efficiency

Our Commitment

At CWSI, we believe in:

• Honesty: We provide upfront pricing and transparent communication.
• Customer-centered approach: We prioritize your needs and preferences.
• Quality craftsmanship: Our installations are precise and completed to the highest standards.
• Unwavering support: We are dedicated to providing exceptional customer service throughout the process.

Experience the CWSI Difference

Contact us today to schedule a free consultation and discover the exceptional service and quality products that have made CWSI the leading window and siding company in Colorado.