Can someone who's not MP...

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Right, that's British not U.S.-related topic, but...

My question is as follows: can technically someone, who's neither a member of Commons and Lords, become the Prime Minister?

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The Prime Minister is answerable to the House, therefore, the Prime Minister must be a member of the House.

Right, which was the reason Douglas Home resigned his peerage to gain a seat in by-election, so he could be member of commons.

However, strictly technically, would a non-House PM allowed?

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The Prime Minister is answerable to the House, therefore, the Prime Minister must be a member of the House.

Right, which was the reason Douglas Home resigned his peerage to gain a seat in by-election, so he could be member of commons.

However, strictly technically, would a non-House PM allowed?

Home, IIRC, was PM for a few weeks prior to winning a by-election.  Technically, yes.

Constitutionally, in the British sense of the word, no, as a permanent arrangement.  The Prime Minister must be a member of the Commons (not the Lords).

Thanks J.J. I wasn't sure at which point Home became PM and at which exact point also a PM.

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Things have changed from that point though; it would no longer be possible for anyone without a seat in the Commons to be appointed as PM.

Yes, but I was talking about strictly technically possibility.