How do I extend my stay in Bangkok? Getting the 30 day extension as an American in Thailand in 2025

On the ground walkthrough of obtaining a 30 day tourist extension in Bangkok for 2025.
Explains who is eligible, what documents to bring, the required forms and fee, office logistics, typical queueing and processing tips, and practical steps to complete the extension smoothly. Aims to prepare travellers for the in person immigration visit and expected procedures.