| Business | Phone |
| A B Electric 26584 Lake Forrest Dr, Twin Peaks 92391 | (909) 337-6585 |
| Bates Construction Svc Po Box 808, Twin Peaks 92391 | (909) 337-6033 |
| Mike's Alpine Electric Po Box 178, Twin Peaks 92391 | (909) 337-3373 |
| Ron Gritton Construction Twin Peaks 92391 | (909) 336-1701 |