| Business | Phone |
| D R Lemings Construction Co 1460 Washington Blvd # C3, Concord 94521 | (925) 672-5600 |
| Independent Construction Co 3911 Laura Alice Way, Concord 94520 | (925) 686-1780 |
| Pacific Mechanical Corp 2501 Annalisa Dr, Concord 94520 | (925) 827-4940 |
| William P Young Construction 4055 Nelson Ave, Concord 94520 | (925) 602-6410 |
| Bel Aire Engineering Inc Concord 94520 | (925) 680-1710 |
| Geotivity Inc 2465 Vista Del Monte, Concord 94520 | (925) 688-2338 |
| Lyone Construction 3737 Northpark Ct, Concord 94519 | (925) 827-1520 |
| Nagara K Naidu 4413 Weeping Spruce Ct, Concord 94521 | (925) 676-3316 |