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When it comes to choosing a commercial window contractor for your business IN Chicago, quality and trust should never be compromised. Working with a professional is an absolute must. With over 20 years experience and a real focus on customer satisfaction, you can rely on us for your Chicago commercial window installation project. Our installations are carried out by fully trained staff to the highest professional standards. Always on time and on budget.

Plus One Windows  has extensive experience working in sensitive, occupied spaces ranging from residential buildings to hospitals to office buildings. Long before any window is replaced in an occupied facility, Plus One Window personnel meet with the property managers or building owner to address concerns regarding the replacement project. Safety, noise, clean-up and traffic control are a few of the issues Plus One addresses when performing a replacement project in an occupied facility. During installation, we remain sensitive and flexible to the customer’s changing needs. Project managers work with crew foremen to schedule around customers.

We offer customized and cost-effective window solutions to projects distinctive by size, type, region and sector.

• 15 windows or 15,000 windows.

• Aluminum, Vinyl, Steel, Fiberglass or Wood windows.

• Mid-west regions.

• High-rise/Mid-rise (Condo/Co-Op/Office), Apartment/Multi-Family, Corporate/Office, Mill/Building Conversions, Institutional/Religious, Medical/Healthcare, Hospitality/Conference Center, Senior/Assisted Living and Historic Restoration Sectors.

commercial window installation
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Commercial window projects are a world apart from home window projects. We have extensive experience working on commercial window projects. We provide a professional experience from start to finish, from detailed quotes & window recommendations to working with you throughout the project.

  • Experienced commercial windows staff
  • Superior Quality and Craftsmanship
  • Quality and Value to the Projects We Deliver
  • Highest Standards in Cost Control
  • On Time and on Budget
  • Real Focus on Customer Satisfaction


  • How much does a window project cost?

    The cost of a commercial window project can vary dramatically depending on style, brand, size & quantity of windows. Please contact us to get an exact quote.

  • What is the timeline for a project?

    A commercial window project timeline can vary greatly. From measuring to ordering, window construction, installation & completion. Every project will have a different timeline. Please contact us for more information.

  • Do you offer financing?

    Yes. We offer financing. Please contact us.


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When your project requires commercial windows with special color appeal, energy savings and style, Plus One Windows is the perfect choice for your commercial window project. We work with our premier window supplier Lindsay Windows on every project. Our vents, hoppers, casement and fixed windows feature heavy duty corner keys with mitred corners, superior white bronze hardware and double weather-stripping in thermal and non-thermal configurations.

Lindsay Windows stocks a large selection of commercial windows and serves the building industry from coast to coast. We carry a wide variety of storefront systems including sash and division bar; flush glazing; pressure walls; and a complete line of bar stock, sheets, angles and channels. We also have an extensive array of panels to our selection of architectural shapes.

Our entrances range from specialty reinforced narrow stile to heavy duty types. We manufacture a wide variety of standard entrances, however, our ability to fabricate to your custom specifications is unparalleled.

Plus One Windows have been fully tested to meet stringent requirements. Please discuss with an architect or engineer whether a specific window is suitable for your application or if a different window 
series might be more appropriate.

Proper glazing procedures are required for successful application of these products.

When you are looking for the perfect windows to enhance your building’s facade, you can count on Plus One Windows experienced staff to assist you in every way possible. We will naturally help you with product selection and design. Plus One has been providing that kind of “old fashioned” service that architects and contractors have come to rely on. You see, Plus One Windows is independently owned and operated, so you deal with on-the-job, caring owners.


We have over 20 years of commercial window experience.

Hotels / Hospitality Industry

• STC necessitations are no problem with our ability to use thicker glass within pre-set glazing pockets.

• At Plus One, we understand that limitations in function are important on some floors, while full functionality and egress safety codes take precedent on others.

• Working in this sector have made us the Hospitality Experts.


Institutions & Educational

• All styles of operating and fixed windows are available including project-in and project-out operational styles, traditionally the most popular for these projects.

• Custom options can be designed to fit your project’s unique character, especially in historical replication instances.

• Additional safety features can be added to lessen the chance of unwanted entry.


• We offer a complete product line of windows and doors for multi-family and assisted living facilities.

• Entry doors with automatic openers, problem-free patio doors that are easy to operate, and maintenance-free windows.

• Durable and economic for large complexes

Energy Efficiency

• Energy Star Approved

• Exceeds NFRC Standards

• Qualifies for the Federal Tax Credits


• Lifetime, Non-Prorated, Transferrable Warranty

• Pinnacle Warranty

Copyright 2018 Plus One Windows Chicago
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