There was no danger that he or his family would have to look at rows of houses lived in by people who wouldn't know how to make their gardens nice _ if indeed there was room for gardens, which there probably wouldn't be.
(I can't understand this sentence and specially the word "danger" here.
"no danger" = "no risk (of the stated thing happening)". In other words, the speaker/narrator is confident that he and his family will not have to look at houses like that.
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"no danger" = "no risk (of the stated thing happening)". In other words, the speaker/narrator is confident that he and his family will not have to look at houses like that.