Beckwith was on his motorcycle when a car struck him. The unidentified driver stopped and cooperated with police. Beckwith later died at San Francisco General Hospital.
The founder of BB Design Build, Beckwith was a carpenter and contractor who went on to co-host Curb Appeal, the HGTV series in which people's outdated homes are given makeovers.
"The HGTV family is deeply saddened by Bill's tragic death, and we mourn his loss along with his many family and friends who will miss his creativity, adventurous spirit and general love of life," the network said in a statement.