What documentation do I need to provide for renewing my Non O retirement extension when renting a condo in Thailand?

Now my extensions are based on marriage and not retirement, but I have had to supply copies of the housebook and ID of the owner, and the rental contract, chanote and housebook for the accommodation itself...

And in Cha Am/Petchaburi they also wanted a yearly note from the landlord saying that I was indeed still staying at their accommodation.

Retirement may be different.

However, the trick is to go ask a month or so in advance of your application, so you'll have plenty of time to arrange documents.

no

Have you been to your Immigration Office to ask for their latest list of requirements for the extension you are applying for?

Sadly many immigration offices seem slightly different

As mentioned above

Hua Hin was different

Best to ask your local office what they require

They asked me for a rental contract if I wanted a tm30 receipt at CM. I said I stayed at my partners house with no contract so didn't need to provide one.

Usually rental agreement is what I have seen accepted without issue.

There may be differences between offices, but I've always had to show a rental agreement in Bangkok, Hua Hin and Chiang Mai.

The TM30 may need to be stamped by the IO at which point they may ask you for the contract. Owner’s Thai ID may well be part of the contract as was in my case.