Do I need to apply for a new TM30 if returning to the same address in Chiang Mai?

OP should have enough information to decide how she wants to do.

Thank you everyone for your comments.

I went to CM Immigration recently.. with the same dilemma after returning from an overseas trip.. they told me that it WAS necessary to file a new TM30 even though i was returning to the same address after only a 2-week break.. though they did not complete any new forms or take any payment.. they simply updated the computer and tippex/ed out the date on my existing acknowledgement slip.. then wrote the new date on it.. was in the office (aka cabin in rear car park) all of 5 minutes!

CM definitely do ( I have lived in CM since 2010 ) and have done for a long time if you are returning from a trip to another country . Should update the TM30 within 24 hours of re- entry but I have found officers at CM Immigration quite flexible if you are a couple of days late .

As others have noted it's local office specific, if you are returning on a re-entry permit/same extension/visa they might allow it, but doubtful if it's a completely new entry stamp.

CM usually requires you to update TM30 when you return from outside Thailand.

I just experienced this exact scenario today in CM. They required a current TM30 even though I had one dated from late April. It hasn't been the case in the past...so I had to leave and get another issued by my landlord. Best be safe than to lose a day at immigration.

Totally depends on your local immigration office so you need to ask them. And be aware that requirements change with staff changes. I had to do so this year for the first time in 6 years

They would notice your international arrival and this is different from just visiting another province, for which they said it is not required. I'd say yes, you need one to play it safe.

To be Safe, have a New TM30 filed. And next time you are in the Chiang Mai Thai Immigration office, ask them for their TM30 filing requirements.