1. Original Affidavit of residence executed at your Embassy or consulate. (under 1 month old) If doing 2 licenses eg. car/motorbike then you can use a copy for the 2nd license.2. Non-immigrant visa.3. Passport4. Medical report from a doctor or hospital (under 1 month old & original ). About 20-50 baht cost.5. Your country driver's license to verify what license you hold (if not you take a test written multi choice & road test. If no bike or car you can rent). Watch the motorcycles as they have no brakes but the test is simple- a slalom through 5 poles.6. 2 photos size 1" X 1"7. fee baht 105 baht.The Chiangmai drivers license centre has photo copy machines, laminating machines & photo stalls etc. tests go upstairs but the Help counter will direct you. Written tests start at 1pm & a motorcycle hiring fee is 10 baht. The tests are easy but the written is somewhat ambiguous. You must get over 15 out of 20 questions but if you fail just go back and do it again. You also have an eyesight test which is simple. If you have both motorcycle & car license from your country then do both licenses using copies for the second license otherwise you have to obtain another letter (original) from your embassy. The license is current for 1 year and following the year you have 365 days to renew or you will have to do the licenses all over again.What you need: Passport & immigration copies, copy from Immigration, 4 small 1"  photos which you can normally get out at the Registration Office for 90 baht & of course the forms & drivers license. You pay 60 baht for the license and they will receipt it then you go back in the afternoon next day to pick up. Go upstairs to window 203 then pay at 202 then collect at 203. { If you need forms or want us to get in Chiangmai then ask us if not sure ). Renewal will run 105 Baht. 3 Baht for three passport copies, 90 Baht for four (4) color pictures (two of which you can keep until next year) Drivers license renewal can take place in one day providing your are prepared to return in late afternoon to pick it up. 
Don't forget to bring your passport!BANGKOK: The Driving License Sub-Division of the Motor Vehicles Registration Office, Tel: 02 279-2959 will tell you where to find the right place. Sukhumvit residents, go to Soi 99. Exit the expressway at Soi 62, turn right into Sukhumvit Road and then left (at Diethelm Building) walk down the long side street and it is on the left at the end of the street.BENEFITS OF HAVING A LICENSE: 1. Its a current driving license if you have an accident.2. The license has your passport number on it so is your ID card for renting cars, hotel stays etc.or admission into places where otherwise you need your passport.3. ID for banking & checking in or out parcels and clearances.4. Renewals are straight forward.5. You are supposed to possess one if living in Thailand after 6 months.6. It can save you a hell of a lot of money in the longrun !!!!!especially if your Inter isn't current & you cannot read the fine print on your Insurance policy.7/. On passing the test, a Thai driver’s license will be issued & is valid for 1 year. This may be renewed for a further 1 year. After 2 renewals it no longer expires.Translate your Thai License:If you have a Thai driver's license, you can have it officially translated with official stamps, your photo and all into English at the Ministry of land transport for 50 baht. This document will then serve as second license for you, a valid international driver's license usable anywhere in the world. This procedure is much easier than getting a Thai issued international driver's license which technically would not be valid in Thailand. When driving outside your home country it is recommended that you always have with you a second (international) driver's license.

Cost for driving license: 105 baht for a car and 55 baht for motorcycle. Applications for driving licenses for other forms of vehicle may not be granted. Do both licenses at the same time otherwise you may have to produce a second Embassy document stating where you live although now the new policy appears to be Immigration letter rather than the Embassy one, either or. You will probably have to sit for a written test on road rules as well. Obtaining a Thai driving license is advantageous if you do not 
have an International Driving License and want to drive in the  following countries with a Tourist Visa.: Singapore, Malaysia, Laos 

Buying a car or motorcycle:1/. Need non immigrant visa2/. Passport and copies of main page and visa page3/. House Reg lease plus now copy of landlord ID & House registration4/. Form to sign available at immigration dept.5/. 2 photos.6/. Once you get letter from immigration saying you wish to buy a vehicle then go ahead.

Make sure you get tabian (reg book) when buying a car and also have change of ownership form, ID of seller; house reg of seller & get him/her to sign a power of authority form. The vehicle must undergo test.