| Business | Phone |
| Encon General Engineering 16060 Sonoma Hwy, Sonoma 95476 | (707) 933-8483 |
| Eric Strand Construction 1201 E Macarthur St, Sonoma 95476 | (707) 935-9628 |
| James Grossi Construction Po Box 660, Sonoma 95476 | (707) 996-9198 |
| John R Benward Co 21750 8th St E, Sonoma 95476 | (707) 996-7809 |
| Mak Engineering 547 4th St E, Sonoma 95476 | (707) 938-5394 |
| Serres Corp 16060 Sonoma Hwy, Sonoma 95476 | (707) 996-6776 |