Riverhead Building Supply is Long Island and Rhode Island’s Leading Source for Custom Windows & Doors.
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Custom Doors and Windows in Long Island and Rhode Island

Long Island and Rhode Island's Leading Source for Custom Doors and Windows

Riverhead Building Supply offers our Long Island and Rhode Island customers the widest selections of quality doors and windows, providing you with the confidence and flexibility to help your clients make the best decisions. We deal with manufacturers that can supply the exact shape and size windows and doors for a truly custom look, or a standard size unit for quick turn-around. From gliders to bows, double-hung windows to French doors, all with a wide range of glazing options, grille configurations and shapes, we can customize each item to your exact specifications. When your order arrives, we'll deliver it to your job site free of charge.

Eagle Logo
Mathews Brothers Logo

We carry doors and windows from the following manufacturers:


If you have any questions about our custom doors and windows, contact us or call us today at 1-800-378-3650 (New York), 1-800-874-9500 (Rhode Island).  Find out how easy it is to Build Smarter. Build Better.