Cheap Charlie’s can hang on 35k but you’ll need capital to at least buy a motorbike if you are not in BKk and you will need some backup for emergencies. I spend about 115k mth but about 40k is on my little boy. In Issan you can get a 3 bedroom house for 5,000 baht. A/C will cramp your budget. I spend about 11K a month on electricity.