9 Brothers Building Supply is your leading lumberwood plankplywood supply company!

Brentwood Lumber

9 Brothers Building Supply carries a selection of Brentwood lumber. We stock your basic lumber needs like Plywoods, douglas fir, pine, and spruce cut planks available in variety of common sizes. Perfect for masons or homeowners that require some wood for assistance in their projects. Stop in at one of our locations in Brentwood or Riverhead today to see our selection of lumber for your project needs!

Stop in or get in touch!

Brentwood Location


1670 Islip Ave. 
Brentwood, NY 11717

Riverhead Location


28 Mill Road
Riverhead, NY 11901


We’ll help you through the process


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

Construction Site Delivery

Local Pickup

Home Delivery

Contractor & Local Business Deliveries