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Instead of saying I have my own house or I have my own apartment, I have heard the words 'I live by myself'.

I have heard these things from the people whose mother toungue is not English.

I think it would incorrect to say 'he lives by himself' to convey you the message that the person got his own flat or house.

Your thoughts, please.
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Quite so.
"I live by myself" means there's nobody else living with you on a regular basis.
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I take "You live by yourself" as "You live alone without assistance from other people".

paco
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Comments  
By oneself means "alone", it doesn't imply that you own the place.
 pieanne's reply was promoted to an answer.
 paco2004's reply was promoted to an answer.
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