| Business | Phone |
| Helmer & Sons 910 Howell Mountain Rd, Angwin 94508 | (707) 965-2425 |
| Bunch Construction 625 Howell Mountain Rd S, Angwin 94508 | (707) 965-3548 |
| Douglas Zimmerly Construction Po Box 312, Angwin 94508 | (707) 965-2243 |
| Henderson Construction Angwin 94508 | (707) 965-3413 |