9 Brothers Building Supply is your Amityville Pool Builders Supply. We carry lumber, forms, concrete products, metal, and coping needed for pool construction, repairs, or renovations. With our wide variety of products we are a one stop shop for contractors and homeowners can get an idea for their pool coping and patio by viewing our expansive collection of paving stones. Stop in at one of our locations in Brentwood or Riverhead to see our full offering of pool building products today!