I just did last week at Jomtien for the first time you need passport photos . TM30 , copy of passport photo page and immigration stamp Page x 2 signed ,if in condo a letter or contract to show you reside there then get Residence certificate which you also get from immigration. Go to information they will tell you if you have everything and give you a queue number . Have to do residence cert get a copy then information again for extension . A few hours to do all . I did over 2 days. You can only extend when 7 days or less