far vs further

[Learner7]

This sentence is fine: Their house is not far from us.
However, I'm confused whether "Their house is not further than us" would mean the same or not?

[Esl_Expert]

Well, although your second sentence might possibly be used in casual conversation, better wording would be this:

(2) "Their house is not further than ours."

And, no, it does not mean the same thing as your first sentence.

Sentence 1 means that their house is near our house. It refers to two places and one distance between them.

Sentence 2 refers to three places and two distances (and the two distances may be the same). It compares two distances:

(2) The distance between here and their house is the same as (or less than) the distance between here and our house.

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"Let me give you a definition of ethics: It is good to maintain and further life it is bad to damage and destroy life." ~ Albert Schweitzer

[Learner7]

Thanks...!