About Us

Advance Roofing, Windows, Siding & Doors was born of the merger of two widely-known local exterior remodeling companies in Delaware – Advance Window & Siding and Kuhn’s Roofing. Kuhn’s Roofing began in Wilmington in 1965 as your typical “neighborhood roofer”, offering repairs and re-roof jobs at a fair price. Advance Window & Siding had been a regional leader for premium exterior remodeling projects since 1989.

President Gary Derrick began working in the remodeling industry at a very young age and in doing so gained valuable insight into delivering top quality products and a great customer experience. As an engineer, Gary worked in the vinyl replacement window manufacturing business where he learned the importance of offering a premium product coupled with professional installation, all at a reasonable price. With Gary’s experience, Advance Roofing, Windows, Siding & Doors provides superior building products which are installed by certified professional installers at a price that’s affordable.

While many things have changed in the industry throughout the past 40 years, the simple values and merits of Advance Roofing, Windows, Siding & Doors has not – providing an honest contractor with the expertise to get it done right the first time, superior products, and a price that customers could afford.

View our A+ Rating on BBB.org

BBB logoOwens Corning Platinum Preferred Contractor



Why Choose Advance Roofing, Windows, Siding & Doors?

We have a comprehensive list of exterior services and strive to provide products and installations that are above and beyond anything you’ll find in exterior services anywhere else. We’re professionally certified by several of the leading home exterior product vendors and stand behind our work and our skilled installers. We want you to be so satisfied that you pass along recommendations for Advance Roofing, Windows, Siding & Doors to everyone you know!

Advance Finishing Touches™

Advance Roofing, Windows, Siding & Doors makes sure that no detail is left unfinished. When we leave your home, it’s going to look even better than it did before we arrived. We guarantee that every window is cleaned, every lock is polished, every inch of your landscaping is clear of debris, and every nail is secure! With Advance Finishing Touches™, you can be sure that none of our shingles will ever blow off your roof!!


  • BBB Accredited Business
  • State of Delaware Department of Insurance
  • Delaware Valley Consumers’ Checkbook Resource
  • State of Delaware Business License
  • ShingleMaster Qualified Workforce
  • Master Elite Contractor Status
  • Owen Corning Platinum Preferred Contractor
  • Owens Corning Top of the House Certificate
  • The State of Maryland Contractors License
  • The City of Newark Contractors License
  • EPA Lead Certification
  • NRCA Certificate
  • See our Reviews on Angie’s List
  • Advance Roofing, Windows, Siding & Doors was featured in Angie’s List Magazine as a 2011 Best Contractor in Philadelphia

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Serving DE, PA, NJ, & MD!

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