Can anyone tell me the actual location of the Immigration Office in Kanchanaburi town? That is, the office which processes visa extensions (i.e 3 month OA extension to 12 months)

thanks

There's an immigration office next to the court house. If you come from the BKK direction, turn left at the redlight in front of the province office / land office (shortly before whatever that hospital is called). Before you get to the river you'll see the sign on the left hand side.

Not sure what services they provide though.

address here http://www.imm3.police.go.th/eng/imm_border.htm

Thank you for your helpful assistance gentlemen.