thailand visa for bangladeshi

How to extend Thai Visa?

No such thing as a 3 month tourist visa. You better check again what type of visa you got, because a Bangladeshi citizen can only get a tourist visa good for 30 days.

That being said. Yes you can extend a tourist visa at any immigration office here in Thailand. This is what you need:

You will need your passport with a photo copy of all pages.
Two 4 cm x 6 cm passport photos
Fill out form Tm 7 Here is one you can download http://www.immigration.go.th/nov2004/dow…

If you need to extend an entry by another 30 days, its pretty easy at least if you are based in Bangkok.
Take the BTS to Mo Chit and get a taxi to the Government Building (another respondent here provided a link). If you go at an offpeak time you will be done in 30 mins to an hour.
If you do a visa run across land and come straight back (i.e. without getting another visa) this will only give you an extra 15 days as far as I am aware.
if say you go to a neighboring country (like Cambodia) you will get a longer extension but my advice to you is
Get a multiple entry visa in your homeland if possible.
Thais do not seem to have a 3 months in 6 rule as is the case in certain 'developed' countries, i.e. you can come and go as you please on a Thai tourist visa.
At the airport you have to play the game and look respectable.
Source(s):
lived in BKK a long time, frequent traveler in and out of BKK

thailand visa fee for bangladeshi

Transit Visa (30 days) — 800 baht - 2000 taka
Tourist Visa (30/60 days) — 1000 baht - 2500 taka per entry
Non-Immigrant Visa (90 days) single entry — 2000 baht - 5000 taka
Non-Immigrant Visa multiple entry — 5000 baht - 12500 taka

An additional service fee of 400 taka (in cash) will be levied.
A bank draft fee of 40 taka needs to be paid.

Bangladeshi Embassy in Bangkok, Thailand
727 Sukhumvit Soi 55 (Thonglor)
Bangkok 10110
Thailand
City: Bangkok
Phone: (+66) 2392-9437 - 8
Fax: +66) 2391-8070
Email: bdoot@samart.co.th
Office Hours: 08.30 - 12.30 and 13.30 - 16.30 Visa: 9.00-12.30

Bangladeshi Consulate in Chiang Mai, Thailand
Consulate General of Bangladesh in Chiang Mai, Thailand
95 Huay Kaew Road
T. Suthep, A.Muang
Chiang Mai 50200
Thailand
City: Chiang Mai
Phone: (+66) 53 212373 - 4
Fax: (+66) 53 223524
Office Hours: 13.00-16.00 hrs


http://www.vfs-thai.com.bd/visafees.aspx