| Business | Phone |
| Atic Construction Inc 1101 Oakwood Cir, Clayton 94517 | (925) 672-8438 |
| Bonnington Construction Clayton 94517 | (925) 383-5302 |
| Habig Construction 3000 Bragdon Way, Clayton 94517 | (925) 672-5000 |
| Mark Reed Construction Clayton 94517 | (925) 672-9976 |
| Michaud Construction Co Clayton 94517 | (925) 672-1922 |
| Robert A Lunghi General Contr Po Box 99, Clayton 94517 | (925) 672-3071 |