| Business | Phone |
| Gates Engineering 2864 Ray Lawyer Dr # 208, Placerville 95667 | (530) 622-9554 |
| Bailey & Kantz Placerville 95667 | (530) 622-7725 |
| D & Z Structural Engineering 1680 Shadydale Ln, Placerville 95667 | (530) 622-8190 |
| Keating Associates 847 Pacific St, Placerville 95667 | (530) 622-9013 |