I know the OP is not in Pattaya but I have worked out a budget for a single farang living in a condo in Pattaya without insurance, please tell me if it's right and anything I left out
Monthly budget
studio Condo jomtien 10k
Electric 2k
Water 500
Transport 500 ,motorbike taxi,bus etc
Food supermarket 8000
Internet cable 2k
Entertainment 5k
Other expenses - 3k, gym , medical etc etc
30,000 baht