New York’s # 1 Source For

Masonry Supplies
Construction Supplies
Bulk Materials

We’re here to consult at any level of municipal development,
commercial construction, hardscaping, and home
development projects.

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When you need an Old Westbury masonry supply company, look no further than 9 Brothers Building Supply. We offer all the masonry products you need, along with construction products, hardscapes, and landscaping options. Our team will help you get just what you need, no matter where you’re located in the New York City area.

At 9 Brothers Building Supply, we offer two locations ready to serve you. Stop by our Brentwood or Riverhead location and pick up the right masonry supply products for your needs. We can even deliver many of our products directly to your job site or home.

Old Westbury Masonry Products

Our selection of masonry products ranges from ADA-compliant options to building bricks and blocks. We carry bagged masonry mix, column caps, brick columns, and so much more.

When you need the right stone coping or edging stones, we have them. Even paver sealers and cleaners are in stock at our two locations. No matter what type of masonry supply you need, we are ready to help you.

Old Westbury Hardscapes

Along with masonry products, we also offer all the hardscape options you need. Whether you’re putting in a driveway, installing a fire pit, or creating a complete outdoor living area, we have the right options. Our outdoor kitchens come from top brands and match our pavers perfectly. We also offer pizza ovens, stone steps, pergolas, and so much more.

Old Westbury Construction

When you’re taking on a construction project, we have a lumber yard, along with plenty of metal products for you to choose from. We even carry egress windows and foundation vents. Our construction products also include pool building supplies and plenty of safety products.

Old Westbury Bulk Landscape Supply

Sometimes, your project may include landscaping. When this is the case, we have all the bulk aggregates, sand, mulch, and topsoil you will need in Old Westbury. We even carry bagged ice melt rock salt products to help out in the winter months.

At 9 Brothers Building Supply, we have all the necessary products for you. Whether you’re a contractor working on masonry projects regularly, or a DIY homeowner, we’re here to help. Our team will provide the friendly service you need at both or Brentwood and Riverhead locations.

Make Plans Reality

Realize your visions with 9 Brothers Building Supply’s premium product categories. In the realm of masonry, discover a range that blends timeless craftsmanship with modern design, ensuring lasting beauty. Elevate outdoor spaces with resilient hardscapes, from elegant stone veneers to durable pavers.

For construction projects, find top-quality materials meeting the highest standards. Whether you’re a contractor or DIY enthusiast, our construction materials provide a foundation for success.

Transform landscapes with our bulk materials—mulch, topsoil, rocks, and sand. Tailor your outdoor space with precision, cultivating gardens, crafting pathways, or constructing structures. At 9 Brothers, we go beyond products; we’re your partner in turning plans into reality.

Make Plans Reality with us—your trusted catalyst for bringing visions to life. Explore possibilities, embrace potential, and experience excellence in every step of your project journey.

Outdoor Living Products

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!



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Plainview Building Supply

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

Rockville Centre Building Supply

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


70 Comsewogue Rd SUITE 9 Setauket-East Setauket, NY 11733 Phone: (631) 928-4665