San Diego County construction activity, measured in building permit valuations, rose 46 percent in the first 10 months of 2011 compared with the same period a year ago, according to the latest data from the Construction Industry Research Board.

Figures released Nov. 22 by the nonprofit industry research bureau showed that builders took out more than $1.9 billion in residential and commercial permits from January to October, compared with just over $1.3 billion in the same period of 2010. Figures cover new construction, renovation and expansion projects.

Residential permit valuations were up 30 percent, to just over $1 billion, boosted largely by multifamily projects, where the total valuation more than doubled year-over-year.

Commercial permits rose 70 percent, to more than $913 million, largely thanks to a 62 percent jump in renovation and expansion projects.

— Lou Hirsh