Retail store & yard

21 Railroad Avenue, East Hampton, NY 11937

Monday – Friday: 7:00 am – 4:00 pm
Saturday: 7:00 am – 3:00 pm
Sunday: 7:00 am – 12:00 pm

Kitchen showroom

15 Railroad Avenue, East Hampton, NY 11937

Monday – Friday: 8:00 am – 4:00 pm
Saturday: 8:00 am – 3:00 pm
Sunday: closed

Riverhead Building Supply is located across from the train station in the Village of East Hampton.

Located inside the store is our millwork showroom containing interior and exterior doors, windows, and architectural hardware for every style and budget. This showroom is staffed with Millwork and Hardware experts that can educate you and help in your product selection.

Our Kitchen & Bath Showroom is located at 15 Railroad Avenue in the brick building on the corner of Lumber Lane. Here Kitchen Designers are available to craft the kitchen of your dreams.

Take advantage of these two showrooms for product selection or to get inspiration for your project!

Featured products


  • Delivery service
  • Blade sharpening service
  • Tool repair service
  • Lockset re-key
  • Decking & railing displays
  • Roofing displays & samples
  • Siding displays & samples
  • Paint & stain mixing, color matching paint only
  • Propane gas tank refills

Installation services

  • Andersen® service & repair
  • Marvin service & repair
  • Storm & screen door installation
  • Window & Door installation and replacements
  • Lift & slide ‘big door’ installation
  • Bilco® basement door installation
  • Screen enclosure installation
  • Gutter installation
  • Garage Doors parts and installation

Interested in a design consultation?

Tell us about your project and a designer will reach out to you