Window Company

303-WINDOWS is a full-service window replacement and installation company serving Denver and Front Range communities. We offer top-quality vinyl replacement windows and doors for homes.

Contact us today to schedule a free estimate for window replacement or installation.

Company History

303-WINDOWS started in January 1995 as Centennial Home Improvements, Inc. Our original plan was to be a full-service residential home improvement company. Our services included: replacement windows, siding, roofing, fences, concrete work, deck construction, patio enclosures, entry doors, garage doors, gutters, and downspouts. We also offered bathroom, kitchen, and basement renovations. We were ambitious!

By June of 1997, approximately 75% of our business was replacement windows. As the demand for replacement windows in the Denver Metro area continued to grow, we decided to specialize in window service.

We saw the benefit in offering expert window installation service to meet the needs of Colorado homeowners. Gradually, we phased out our other home improvement services. Today, we offer only residential vinyl replacement windows and patio doors.

Best Replacement Windows Denver

The Best Denver Window Company

You and your home deserve superior service, lasting quality, and proven results. Windows are a long-term investment in your home. Don’t settle for less than the best. Work with your trusted Denver window partners at 303-WINDOWS.

Quality and Loyalty

Dedicated to a high level of customer satisfaction, 303-WINDOWS prides itself on quality installation with top products. We offer vinyl replacement windows from Anlin, a trusted and durable brand.

We’ve proven our loyalty to our Colorado customers. We’ve offered reliable window service to homeowners in the Denver area for 30 years from the same location. When customers choose 303 Windows, they know we’ll be there to offer support and answer questions after installation. We aren’t just concerned with booking the next project. We want to build ongoing relationships with our customers.

Energy Efficiency to Protect Beautiful Colorado

Today, energy efficiency matters. As Colorado experiences climate change, we all want to do our part to protect the environment. One way to show our love of Colorado is by offering energy-efficient products.

Vinyl windows provide superior energy savings with Low-E glass, insulation, weatherstripping, and customized glazing systems to minimize heat transfer and maximize thermal performance. We recognize that our customers want to protect the environment and save money on energy costs. We offer windows from Anlin, an ENERGY STAR-rated company because they support our goal to provide energy-saving window products.

Locally-Owned and Operated

As a local, family-owned Colorado business, we depend on valued relationships. We live in the communities we serve. Plus, we understand what it takes to make a home operate its best in the Colorado climate.

We aren’t a huge corporation that doesn’t understand the local area or homeowners’ needs. When you choose 303-WINDOWS, you choose to work with your neighbor. And we know our success depends on treating each customer with the respect and appreciation we would show to our friends, family, and neighbors.

We love Colorado! We want to do our part to make Colorado’s homes look and function their best!

Got some questions? We’ll be happy to assist!