Long Island and Rhode Island's Choice For Building Supplies For Over 65 Years 
Ensure your projects are done right every time with exceptional building materials and services from Riverhead Building Supply. Our quality building supplies, pre-job planning services, installation teams and more, help you enjoy peace of mind. You can be confident that your job is being completed with only the best products and by some of the most experienced professionals in the industry. 

Builders, contractors, architects and homeowners throughout Long Island and Rhode Island count on us for a broad range of building supply products and specialty services. From lumber, tools, hardware and paint to fine cabinetry, flooring, kitchen design, windows, estimating and custom molding, we have the premium building materials and service selection you need to make every project a smooth success.