One good way to help you determine whether to use a contractor or not is to check with some of his past clients and find out from them what they have to say about the contractor's quality, work ethic, communication level, attention to detail and general customer service.
Listed here are several names and phone numbers of customers who I have had the opportunity to do work for over the past several years. Please feel free to contact any or all of them.
Richard and Pat Marcogliese (925) 855-4600
Nick and Britney Fanelli (925) 548-9801
Ben and Mary Morris (925) 687-0383
Casey Campbell (510) 853-4333
Pat Fiore (650) 544-3597
Dick and Kitty Hay (925) 229-2496
Robin and Nancy Wendt (925) 838-6956