Riverhead Building Supply is an authorized dealer of Andersen® windows and doors

Andersen® is the largest window and door manufacturer in North America and is the brand pros trust for dependable, high-performing windows, replacement windows, doors, parts, and accessories. We carry a full line of Andersen products including the 400 Series, A Series, and others.

Andersen is the #1 trusted window and door brand.* Andersen 400 Series are the windows contractors trust the most.** Andersen is the #1 brand for window replacement.**

* 2022 Andersen brand surveys of U.S. contractors, builders & architects. ** 2022 Andersen brand survey of U.S. contractors.

Visit a design showroom to see

Andersen products and speak with a Specialist

Andersen windows, replacement windows, doors, parts and accessories

Andersen has beautiful windows and doors to fit any design, function, or budget. For new construction or renovations, our innovative and high-quality Andersen products are the perfect choice.



High-quality Andersen products are the perfect choice for any design, function or budget.
  • Series – 400 Series, A-Series, and E-Series
  • Styles — Casement, awning, double hung, gliding, picture, bow, bay, and specialty sizes
  • Materials — Wood, vinyl, composite (Fibrex®), aluminum and fiberglass

Installation services are provided for window replacement and repair

Learn about our many Andersen collections

Visit a showroom and speak with a specialist today

Connect with a millwork specialist