Our Services

As one of the only window and door wholesalers in the St. Louis area that has full-time service professionals on staff, our team at XL Building Products is here to provide you with the product knowledge and assistance you need. Whether you need specification requirements or application and repair information, we take the time to deliver quality customer service backed by our industry experience, professional training and local resources.

Specification

Our skilled professionals support you throughout the entire specification and selection process. We offer on-site measuring assistance and consulting to help determine your specific needs based on architectural design, style preferences and price point. Tell us about your project and the features most important to you and we will work with you to ensure the perfect product is chosen for your project. As ordered, your windows and doors will arrive to specs within the scheduled timeframe.

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Installation

Not only do we provide a variety of products, but we partner with qualified local builders so we can refer recommended contractors for professional installation. Whether you’re building a brand new home in St. Charles or replacing windows in a 100-year-old home, our network of preferred contractors can install windows and doors for virtually any scenario.

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Repair

For your convenience, XL Building Products refers preferred local contractors for window and door repairs. Not only does our local network of builders and contractors provide smooth installation and repair services, but it enables us to offer our customers further support services successfully, which assists in satisfying our customers even more.

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Water and Air Testing

Water and air testing for windows is essential to ensure energy efficiency by reducing HVAC costs and improving indoor comfort. It also helps prevent water leaks, which can lead to mold growth, wood rot, and serious structural damage. These tests verify the quality of window installation, particularly in new construction or after retrofits, and help ensure that installations meet building codes or warranty requirements, including compliance with ASTM standards or AAMA certification.

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RRT - Rapid Response Team

 

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Engineering Services

Door and window installation engineering is a specialized field within building design and construction that ensures doors and windows are properly selected, positioned, and installed to meet structural, thermal, acoustic, and weatherproofing requirements. It involves both design-phase planning and on-site execution, particularly in complex or high-performance commercial and residential projects.

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Take off Services

XL Building Company provides comprehensive takeoff services, accurately quantifying and itemizing all materials, components, and labor required for a project based on construction drawings and specifications. This essential process serves as the foundation for preparing detailed bids, estimates, and material orders.

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Show Drawings

XL Building Company can create detailed technical drawings create for contractors, suppliers, or manufacturers for your window and door installation projects.

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Project Management

Let XL Building Company handle your window and door installation project. XL will oversee every aspect of the planning, coordination, and execution of installing doors and windows on a construction project. This ensures that the work is completed on time, within budget, to specification, and in compliance with code and quality standards.

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Value Engineering (VE) Preconstruction

Value engineering (VE) during for window and door installation is a strategic process used to evaluate design, materials, and methods in order to optimize performance, reduce costs, and maintain or enhance value. 

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Historic As-Built Drawings

Historic as-built drawings are critical for ensuring that replacements, restorations, or retrofits of doors and windows preserve the architectural integrity, meet regulatory requirements, and fit existing openings precisely.

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Measuring and Installation of Historic Tax Credit Windows

XL Building Company specializes in the precise measuring and expert installation of windows that meet the stringent requirements of Historic Tax Credit (HTC) projects. Our team understands the critical balance between preserving architectural integrity and ensuring modern performance and compliance.

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