You can extend your stay in Thailand by requesting the extension of your permit or visa for an additional 30 days at the immigration offices in Bangkok.
To obtain this extension, you must go to the immigration complex, located north of the city, near Don Mueang International Airport.
You can take a taxi directly or approach first with the MRT subway (Chatuchak station, Exit 2) or with the BTS Skytrain (Mo Chit station, Exit 3) and, at the exit, take a taxi.
It is located 14 km (25 minutes) from the MRT and BTS stations.
*** Long stay visits 2020–2021
Under the STV program, long-stay visitors can stay in the country for 90 days, which can be extended twice, each for an additional 90 days. The visa will cost 2,000 baht for each extension.
This program is expected to go into effect after the official announcement and will be available until September 30, 2021.
The STV will be granted to long-stay visitors who comply with the preventive and control measures of COVID-19 in Thailand at all times: An alternative local state quarantine (ALSQ) of 14 days upon the arrival (update before travelling). They must also justify their long-term residence by booking accommodation, rental agreement or ownership of a condominium.
Source: tatnews.org / September 2020
The information is out of date. Extensions ar no longer issued ay Chaeng Wattana.
Thanks for the warning KRBW.
The situation is unstable due to the pandemic, we will update the information when normality returns. For now, I will notify in the post.