Quality construction products for commercialresidentialDIY projects big and small!

Southampton Construction Supply Products

9 Brothers Building Supply is your source for Southampton construction supply products that we select for reliability and quality. We carry commercial-grade construction products that are harder to find at your local depot store. Homeowners and contractors alike please stop in at either our Brentwood location or Riverhead location to see our collections in person and let us help you make your dream become a reality!

Southampton ADA Solutions

Southampton Concrete Construction Products

Southampton Egress Windows

Southampton Foundation Vents

Southampton Lumber

Southampton Metal

Southampton Poly Sheeting

Southampton Pool Builders Supply

Southampton Construction Safety Products

Southampton Styrofoam Insulation

Delivery across Long Island, NYC, and the 5 boroughs

Construction Site Delivery

Local Pickup

Home Delivery

Contractor & Local Business Deliveries

COVID-19 Essential Businesses New York

COVID-19 Essential Businesses New York

Update – WE ARE OPEN – but here’s what changes to expect until further notice.

It is with sad dismay we must make this announcement – the COVID – 19 Coronavirus is severely impacting and changing everybody’s lives. We’re here to assist, and we are open during normal business hours – however we must make changes to how we do business at 9 Brothers Building Supply until further notice.

Essentially, we will not be coming into contact with clients.

Our stores are open for business. We ask that we limit clients to 1 client per visit, while practicing social distancing. We also encourage using phone calls and our website to browse our products.

We encourage all of our clients and Masons, Landscapers, and Contractors to PHONE-IN their order, and utilize our website catalog for shopping.

We are still delivering.

All customer payments will be digital over the phone via Debit Card/Credit Card. Only known businesses will still be able to mail a check to us. New businesses must drop off or mail a check and it must clear before any goods are shipped or released for pickup. You can become a “known” business by filling out a credit application.

If you have any questions, please ask. We urge you to visit NY Governor Cuomo’s Issues Guidance on Essential Business List.