Welcome to 9 Brothers Building Supply

Long Island, NYC, and the 5 Boroughs Largest Supplier of
Masonry, Hardscapes, Construction Materials, and Bulk Materials

Finding the right building supply company in NYC for your needs isn’t easy. at 9 Brothers Building Supply, we provide everything you need for masonry, construction, hardscapes, and many other projects. Whether you’re running a construction company, ready-to-hire homeowner, or you’re a DIYer, we have all the products you’re looking for. Our staff is friendly, knowledgeable, and ready to help you. Whether you already know exactly what type of building supply products you need or you want us to help you choose, we’re here to serve you in the Long Island area. We carry a variety of products including concrete mixes, pavers, outdoor living products, and so much more. When you want to find the top brands for your specific needs, we carry all the best carefully chosen brands at both our locations.

Long Island & NYC’s Building Supply

We’re here to consult at any level of municipal development, commercial construction, hardscaping, and home development or improvement projects. With over 40 years of experience in the Building Supply industry, we have streamlined only the best products and logistics available for a fast and easy experience. The right building supply products combined with our guidance makes everything easier. From concrete forming, to chemicals and compounds, structural reinforcement, the widest selection of masonry, for various applications gives you endless choices for your next project. At 9 Brothers Building Supply, we provide all the necessary construction and masonry products for contractors and construction companies throughout the Long Island NYC area. We even supply homeowners looking to handle their own. Our team will help you choose the right products, no matter what type of project you’re trying to complete.

Masonry & Hardscapes

Creating the right patios, driveways, walkways, and other hardscapes can be difficult with all of the various technologies and options between different brands. Attaining quality projects to create desired looks can require using multiple brands and products with different installation techniques. Our knowledge can help make any combination of products possible. Our masonry products are all quality manufactured or natural stones sourced from leading brands. Along with our bulk material offerings, compliment or change your newly created hardscape with landscaping materials, such as bulk mulch, sand, rocks, and more!

Outdoor Living

We also carry everything you need to create an outdoor living space, swimming pool deck, retaining wall, outdoor fire features, and dining spaces. Our outdoor living products can be mixed or matched to create a space everybody is sure to remember. Create a euphoric outdoor space to you can always feel comfortable in and entertain family or guests. Let us help you create the perfect combination of hardscapes and outdoor living for you or your clients, call or stop in one of our two locations today!















9 Brothers Building Supply is one of the largest suppliers of Outdoor Living products and Hardscapes on Long Island, NYC, and the 5 Boroughs. Transform your outdoor space with our best collection of quality products and wide variety of options to suit your taste. Let us help deliver your dream project today!






We’ll help you through the process

Forklift & Boom Service

Let us do the heavy lifting and ensure a smoother delivery with our forklift and boom service.

Delivery Service

Our fleet of ready to haul trucks regularly performs job site and home delivery to Long Island, and the 5 boroughs of NYC.


Our knowledgeable staff can consult your dream outdoor spaces, or guide product recommendations based on your individual needs and wants.

Stop in or get in touch!

Brentwood Location


1670 Islip Ave. 
Brentwood,  NY   11717
Phone: (631) 273-3323

Riverhead Location


28 Mill Road
Riverhead, NY 11901
Phone: (631) 208-1630