Since 1978, Royal Prime has offered a variety of windows to fit different budgets and designs. The company specializes in residential and light commercial products. Each of its windows offers insulation, durability and easy maintenance. Its materials are tested at private labs to ensure consistent quality. Royal Prime s line of windows include double-hung vinyl; casement, bay and bow vinyl; welded double-hung; and Euro-weld tilt. The company also offers a variety of patio doors. Royal Prime is located in Elizabeth, N.J.