Many foreigners, they don’t know whether they can extend their visa in Pokhara or not. Infact they can extend their visa in Pokhara but still, it’s good to know that not all the visa processes here, you might have to go Kathmandu as well.
The immigration office is located along with Nepal Tourism Board, Pokhara office. It is situated near by Rastra Bank Chowk on the way to Birauta. The office opens at 10 AM in the morning and closes at 4:30 PM. Since, it is located nearby Lakeside; you can get there by walking as well. If you want to get there by vehicle then you can find public buses and taxi easily. You can find the route on Google Maps here.