The following is the table of costs of construction costs in Bangkok Thailand as of Mid 2020 conducted by the Thai Appraisal and Estate Agents Foundation which is a principle member of FIABCI.  Dr.Sopon Pornchokchai, President of Agency for Real Estate Affairs (www.area.co.th) is the President of FIABCI-Thai and the Foundation.

Please see the costs of construction at the following link:
http://www.thaiappraisal.org/english/the2001/default.php