Window contractors replace old or damaged windows and install new ones in additions and remodels. They measure openings, recommend frame materials and glass options, and install and seal windows to keep out drafts and water.
Common window services include:
Consider window replacement when windows are drafty, fogged between panes, hard to open, rotting or letting in water, or when you want better comfort and appearance. Glass-only repairs and window cleaning are separate categories.
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Colonial Construction has served the Greater Saint Louis area since 1977 as a family-owned exterior contracting company focused on high-quality siding, windows, and doors. The company provides comprehensive exterior project services with an emphasis on communication, professionalism, attention to detail, and customer-first service, aiming to transform homes and deliver long-lasting results backed by decades of local experience.
Empire Supply Co is a third-generation, family-owned glass and window supplier serving Greater St. Louis since 1931, offering residential and commercial glass solutions including insulated replacement windows, custom mirrors, storm windows and doors, aluminum commercial windows, and energy-efficient options such as Low-E and double- or triple-pane glass. Empire Supply Co operates a stocked showroom at 7286 Manchester Rd in Saint Louis, provides on-site quotes and installations, and emphasizes craftsmanship, local service, and decades of experience supporting homeowners and businesses across the St. Louis area.
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Penny Window is a family-owned St. Louis window, door, siding, and gutter company serving the St. Louis metro area since the 1950s, offering replacement and new-construction windows, entry and patio doors, storm windows, siding, and related exterior services with an emphasis on energy-efficient glass options and custom solutions. Penny Window provides free estimates, works with industry-leading brands and warranties, maintains in-house installation crews to ensure consistent craftsmanship, and focuses on delivering durable, energy-saving products and personalized service backed by decades of local experience.
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STL Windows Direct is a family-run window and door company serving the St. Louis metro area that offers ProVia and Pella products and professional installation of energy-efficient windows and doors as well as exterior and interior home services including siding, decks, kitchens, and baths; the company operates a showroom in St. Peters and an office in Maryland Heights, brings over 80 years of combined industry experience, and focuses on improving home comfort, efficiency, curb appeal, and long-term value for local homeowners.
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Universal Windows Direct is an exterior remodeling company offering custom UniShield® vinyl windows, entry and patio doors, vinyl siding, gutter protection, roofing, attic insulation, and related home-improvement products and installation services; Universal Windows Direct emphasizes energy efficiency, a True Lifetime Warranty, flexible financing, white-glove customer service, and more than two decades of industry experience while operating multiple regional locations (including St. Louis) and participating in community giving programs.
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Window World of St. Louis is the St. Louis–area branch of Window World that provides American-made vinyl replacement windows, entry and patio doors, and vinyl siding with professional, factory-trained installation backed by a lifetime warranty. Window World of St. Louis offers free in-home estimates, financing options (including promotional 0% APR terms), and emphasizes energy-efficient products and precise installation to improve home comfort, curb appeal, and long-term value; the company is based at 3600 Rider Trail South, Earth City, MO.
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A window contractor measures openings, helps you choose window styles and materials, removes old windows, installs new units with proper flashing and insulation, and finishes trim. Some also cut new openings or enlarge existing ones.
Insert replacement fits a new window into the existing frame and disturbs less trim. Full-frame replacement removes the old frame, which allows inspection for rot and better flashing. An installer can recommend the method after checking your frames.
Compare window brands, frame materials, glass packages and energy ratings, along with installation details, cleanup and warranties for both product and labor. Ask whether a permit is needed and who measures and orders the windows.
Cost depends on the number, size and style of windows, frame material, glass options, the installation method, repairs to rotted framing, interior and exterior trim work, upper-floor access and local permit requirements.
Remove window treatments and hardware, move furniture away from windows and clear a path for the crew. Take down fragile items nearby and plan for rooms to be open to the outdoors briefly while each window is replaced.