Assistant District Attorney Anna Ferguson said 41-year-old Kurt Schoemig was charged Monday with two counts of involuntary manslaughter.
She said in a statement he "played a substantial factor" in causing the deaths of 69-year-old Albert Senzatimore of San Jose and 57-year-old Gary Trovinger of Los Gatos at Trovinger's home in Tahoe Donner in October.
Ferguson said Schoemig, president of Cedar Ridge Builders, didn't have the necessary permit for work done last year.
Police say an employee cut a furnace exhaust pipe, but the project wasn't completed, leaving the pipe to vent into the home when the heater started.
A measure on the California November ballot would reduce some drug possession and theft-related felony crimes to misdemeanors. Proponents say it would reduce prison overcrowding and prison costs. Opponents say it would put dangerous criminals back on the streets and overcrowd local jails.
Stockton Police are looking to question a man who might have dropped off the gunmen in the Bank of the West robbery and shootout in July.
After a dramatic drop in Stockton's homicide rate over the last couple of years, the violent death numbers are going back up again.
The City of Sacramento Police Department says the crime rate has dropped significantly for the second year in a row. The police chief credits more community involvement.