Renick Subaru has added 3,500 square feet to the dealership in Fullerton, taking it to about 212,000 square feet.
The dealership had about $50 million in sales in 2011 and has seen an 80 percent increase over the first six months of this year, said spokeswoman Erin Peacock.
“Renick Subaru is experiencing one of our best sales years ever,” said James Renick, vice president of Renick Subaru.
The dealership was founded in 2001 and sells Subaru cars, sedans, crossovers, wagons and SUVs. It is a sister dealership to Renick Cadillac, also in Fullerton.