Samui today. 30 day exemption extension. In and out in less than 1 hour. Thanks to admins for advising what was needed...none of the 'extras' suggested by 1 person (for a different office) such a form completed by a local/landlord or overstay waiver :)
TLDR : Answer Summary
A user successfully obtained a 30-day visa exemption extension in Samui, completing the process in under one hour. They credited the advice from the community for their preparation, noting that no additional paperwork, such as landlord forms or overstay waivers, was required.