EcoSmart Custom Built Replacement Windows designed with the highest-quality in mind.

Midwest Construction & Supply Inc. is committed to providing high-quality windows and patio doors. So we’ve partnered with a company with decades of experience in developing the highest-quality replacement windows homeowners can find – Great Lake Window. Their attention to quality originated in 1981 when the founders of the Great Lakes Window brand discovered a popular window technique used in Europe. They quickly brought it to their home in Toledo, Ohio. Today they’re still developing many innovative product lines, including EcoSmart windows.

EcoSmart windows and patio doors premium products are made using state-of-the art technology, modern equipment and cutting edge operational techniques. The strength of their parent company, Ply Gem, with over 70 years in the building products industry, provides the opportunity for the Great Lakes Window brand to bring more innovative solutions in design, performance and function that go above and beyond your expectations in replacement windows and patio doors.

Custom built for this early 1990's home:

Midwest Construction is a family owned and operated exterior remodeling company founded in 1958 by Alex P. Despenas. His slogan “Quality Products & Quality Installation” and we still live up to it today.

Midwest Construction specializes in Replacement Windows, Insulated Siding, and All Season Sunrooms. We have researched and secured the best products in the exterior remodeling industry for your project.

A remodeling project may seem overwhelming, but with Midwest Construction, Iowa’s exterior remodeling leader, the project goes smoothly. Midwest efficiently guides you through the remodeling process, from your initial design/quote appointment, through the construction phase to providing you with the best warranties in the industry for protection for years to come.

When your ready for a Free Inspection and Exact Cost, give us a call at 1-800-925-6664 to schedule a convenient time or schedule online at

2021-SE 44th Court - Grimes, Iowa 50111                     1601-South Taft Avenue - Mason City, Iowa 50401