Mainstream Home Improvement: A Trusted Quad Cities Roofing, Windows, and Siding Contractor

Mainstream Home Improvement in Moline, IL, is a locally owned and operated contractor specializing in exterior home improvements. Founded in 2001, the company focuses on residential projects, bringing factory-certified expertise to every job. The team is available during standard business hours for consultations and scheduled work, providing reliable service for homeowners throughout the region.

Business Overview

Mainstream Home Improvement serves residential clients in the Quad Cities and beyond. The company is licensed and adheres to all local building codes and industry standards. With a dedicated team, they handle projects from initial inspection to final installation, ensuring each home is treated with care.

Key Services

Mainstream Home Improvement offers a full range of exterior services to protect and beautify your home. Their main services include:

• Roofing: New roof installation, roof repair, roof replacement, reroofing, and thorough roof inspections.
• Windows: Installation, repair, and replacement of energy-efficient windows, including skylights. They are the exclusive local dealer for premium Infinity from Marvin products.
• Gutters: Installation, repair, and replacement of seamless gutters and gutter protection systems.
• Siding: Professional siding installation and replacement to refresh your home's exterior.

These services help Quad Cities homes withstand local weather, from summer storms to winter snow.

Areas Served

Mainstream Home Improvement proudly serves a wide area across Illinois. This includes Moline, Rock Island, East Moline, Silvis, and the greater Quad Cities region. They also extend service to Peoria, Bloomington, Galesburg, Pekin, Canton, Kewanee, Princeton, and many surrounding communities. Their extensive local experience means they understand the common architectural styles and maintenance needs of homes in these areas.

Company History

The company opened its doors on July 31, 2001. Founder Spencer Sierra started with a vision centered on trust and craftsmanship, believing that strong word-of-mouth referrals would come from treating every customer right. Over more than two decades, that philosophy has remained core to their operations. A significant milestone was reached in 2025 when Mainstream Home Improvement became the exclusive Quad Cities dealer for Infinity from Marvin windows, enhancing their product offerings for local homeowners.

Leadership

Spencer Sierra, a lifelong Quad Cities resident born and raised in Silvis, leads the company. His deep community roots and personal values shape the business's customer-first approach. Married with two daughters, Spencer is an active parishioner in his local Catholic church. Outside of work, he enjoys family time, reading, and is known to have a fondness for Whitey’s Ice Cream. His leadership is driven by a simple motto: to build a great company, not just a great home improvement company.

Specialties & Highlights

Several key features set Mainstream Home Improvement apart:

• Exclusive Product Partnership: As the only Infinity from Marvin dealer in the region, they offer premium, high-performance window solutions.
• Strong Workmanship Guarantee: All projects are backed by a lifetime workmanship guarantee, providing long-term peace of mind.
• Local Expertise: With over 20 years in business, they have deep knowledge of local building codes and typical home styles in the Moline, IL area.
• Award-Winning Reputation: The company has received multiple awards for its contributions to the community and quality service.

Why Locals Choose Mainstream Home Improvement

Homeowners in Moline, IL, and the wider service area choose Mainstream Home Improvement for their reliability and established local presence. The combination of a five-year workmanship guarantee, exclusive product lines, and a founder deeply embedded in the Quad Cities community builds strong trust. They focus on doing the job right the first time, with a humble and careful approach that has earned them a lasting reputation. For exterior projects, many turn to Mainstream Home Improvement in Moline, IL, for quality that stands the test of time.