| Business | Phone |
| Clark & Assoc 125 Petaluma Blvd N # C, Petaluma 94952 | (707) 765-5770 |
| Cornerstone Structural Engrs 7 Makena Ct, Petaluma 94954 | (707) 781-3150 |
| Meece Engineering 429 Magnolia Ave, Petaluma 94952 | (707) 766-6783 |
| Scott Parker Structrl Engnrng 228 Payran St, Petaluma 94952 | (707) 782-9551 |
| Yoshioka Associates 2214 Magnolia Ave, Petaluma 94952 | (707) 778-8306 |