Visa extensions are possible in Dhaka at the Immigration and Passport Office, Agargaon Rd. Fees are the same as a single-entry visa, even if just trying to expand your 15 day pittance into a full-fledged 30-90 day visa, making a sidetrip from India for longer than 15 days an expensive endeavor. If you want to stay only a little longer, it's better to just pay the overstay fee of Tk 200/day for up to 15 days, which grows substantially to Tk 500/day thereafter. Some of the smaller backwater crossings such as Tamabil may not even notice that you've overstayed if don't point it out yourself.
The Most Frequently Asked Travel Questions about Bangladesh
Where To Stay & Best Hotels in Bangladesh - updated Mar 2024
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Bangladesh Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.