Actually the main immigration office at the government complex out on Chaengwattana Road is NOT where you go to get a 30 day extension on a visa exempt entry 😮 🙁
You go to the immigration office located at IT Square Laksi Plaza. That's the ONLY office in Bangkok to get 30 day extensions on visa exempt entries.
It's here
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You also need to have a TM30 filed by your hotel or where ever you stay showing you're registered as staying in Bangkok. There are copy/photo shops next to the immigration office.
If I was a betting man I'd bet they will say NOPE and then tell you that you can do a report in person from 2 weeks before the due date until 1 week after the due date.
As Ellie said, all you can do is ask, you're out nothing by doing it 🙂
Remember the 90 day reporting room at Chaengwattana moved up one floor to it's own separate room (so on the 3rd floor). They do resident certificates, TM30's and 90 day reporting up in that room now.
and now that we have every Tom, Dick and Somchai 😮 weighing in on the time frame depending on the office I'd say we're done and the O/P has more than enough information to know what's what with their upcoming retirement extension application 🙂
Okay SOME offices (Bangkok, Pattaya, Phuket, Chiang Mai, etc) allow you to apply when you have 45 days or less left on your current stamp but MOST of the other 80+ offices scattered around the country allow you to do it when you have 30 days or less left on your stamp
Seeing as the O/P didn't say where they are in the 513K square kilometers that comprise the glorious "Land 'O Thaiz" I went with the "when you have 30 days or less" seeing as that will work at EVERY office 😉
Not to mention that their current stamp runs out in just 29 days anyway 😛