POA or a Power of Attorney is a document in which one person (the principal) appoints another person to act as an agent on his or her behalf. This confers authority on the agent or Attorney-in-Fact to perform certain acts, private affairs, business, or other legal matters on behalf of the principal.
A buyer or seller of real property who wishes to authorize another person to act on their behalf must fill in and sign the POA form specially provided by the Land Office. The Land Department branch offices in Thailand only accepts the official standard Land Department’s Thai script ‘Power of Attorney’ (Tor Dor 21 for land and house; Or Chor 21 for condominium).  Using these forms will make sure that the principal gives all the required information. The completed form, together with a certified copy of the principal’s citizen ID card or passport and visa, are then presented by the agent to the Land Office official.
To protect the interests of the principal and other interested parties, the principal must:
The principal must have the completed form legalized/notarized by the embassy or consular office/a notary public if completing the form outside Thailand.
The normal validity of a POA is 3 months from the date of signing. This shall also depend on the officer’s consideration at the Land Office.
An agent can represent both parties at the same time. If the agent represents both parties, the principal must clearly specify in the POA their consent to the agent representing the other party.
You need to submit all documents such as Birth Certificate, Marriage Certificate, Death Certificate, etc. in Thai. Translated documents must first be certified as correct translation of the original document.
