This database consists of key contacts at construction companies, covering those that build houses, residential buildings, industrial buildings, highways and streets, bridges and tunnels, water / sewer / power lines, and heavy structures. Also included are special trade contractors that provide related services such as those that deal with structural design; plumbing, heating, AC; painting, paper hanging, decorating; electrical work; masonry and stone setting; plastering / drywall / acoustics /insulation; terrazzo, tile, marble, mosaic work; carpentering; floor laying, carpet and tile; roofing and sheet metal work; excavating and foundry work; wrecking and demolition work; installation of building equipment; fence construction; etc.