What supporting documents do I need to extend my tourist visa in Thailand?

To extend your tourist visa in Thailand for an additional 30 days, you will need to gather several supporting documents. These include: proof of your address in Thailand, a signed copy of your passport data page, a signed copy of your entry stamp, a signed copy of your visa, a signed copy of your TM6 departure card (if issued), and a completed TM7 form (available at the immigration office). Additionally, you will need a passport photo and 1,900 baht for the extension fee. Some immigration offices may also require a TM30 form, which should be filed by your hotel or landlord.