9 Brothers Building Supply is your leading bulk rockgravelpebble supply company!

Riverhead Rocks

With the right rocks, you can complete your landscaping. We are your Riverhead rocks headquarters. At 9 Brothers Building Supply, we offer all the landscaping rocks you need in Riverhead for your walkway, driveway or any other area of your landscaping.

With a variety of options, you can get the rocks you need from us. We supply contractors in Riverhead, along with DIYers looking to complete projects around the home.

MSI – Beach Pebbles

When it comes to the right rocks for your Riverhead project, beach pebbles are a great option. They come colored and polished to give you the decorative look you desire. Landscaping comes together with the right pebbles for your specific needs.

With the beach pebbles from MSI, you get a stone that works great under downspouts for washouts. They can be used in the front entrance, as well. You can get these beach pebbles in five different colors. They work great outdoors and indoors as decorative rocks, too.


We also offer plenty of different types of gravel when you need gravel for your landscaping project. We have crushed bluestone gravel, white gravel, pea gravel, bluestone screening, and red crushed gravel. Choose from a few different sizes to fit your specific needs.

With the right gravel, you can create a great-looking driveway or walkway. It can also be used throughout your landscaping for many different things.


You can also get the right pebbles from us, too. We supply Mexican Beach pebbles for your landscaping needs. These pebbles, along with our white stone pebbles come bagged and ready to be used. Our Himalaya white pebbles are from MSI and offer another great choice.

Whether you’re looking for rocks to complete a driveway or just to add decoration to your landscape, we have just what you need. We are the go-to choice in Riverhead for rocks used in landscaping.

Stop by one of our two locations in Brentwood or Riverhead today. Our team will be happy to help you get the rocks you need for your landscaping projects.

Stop in or get in touch!

Brentwood Location


1670 Islip Ave. 
Brentwood, NY 11717

Riverhead Location


28 Mill Road
Riverhead, NY 11901


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Forklift & Boom Service

a mini crane service for tight or hard to reach delivery spots!

Delivery Service

with our fleet of ready to haul trucks anywhere on Long Island, NYC & 5 Boroughs

Consult Us

to build your dream backyard, driveway, landscape, pool, or patio!

Delivery across Long Island, NYC, and the 5 boroughs

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Local Pickup

Home Delivery

Contractor & Local Business Deliveries