| Business | Phone |
| Backen & Gillam Architects 1028 Main St, St Helena 94574 | (707) 967-1920 |
| Lail Design Group 1505 Main St, St Helena 94574 | (707) 963-1565 |
| M 2 Studio 1334a Vidovich Ave, St Helena 94574 | (707) 967-8383 |
| Mary Sikes & Assoc 1472 Railroad Ave, St Helena 94574 | (707) 963-8063 |
| Valley Architects 1560 Railroad Ave, St Helena 94574 | (707) 963-1466 |
| Bouligny & Assoc 497 Silverado Trl N, St Helena 94574 | (707) 963-3013 |
| Donald J Clark 355 Crystal Springs Rd, St Helena 94574 | (707) 963-2479 |
| Robert R Gregory 1485 Main St # 301, St Helena 94574 | (707) 963-7650 |
| Leong & Assoc 1145 Crane Ave, St Helena 94574 | (707) 963-5461 |
| Ron M Nunn & Assoc 1385 Saint James Ct, St Helena 94574 | (707) 963-0899 |
| Triade Design Studio 3475 Saint Helena Hwy N, St Helena 94574 | (707) 963-0838 |