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I can't imagine they'd make too much money on it. The upper limit for that street would, I would imagine, be verging on a normal house price. Judging by the house you can see in the back of the first photo the back garden isn't massive. Yet they doubled the floor space and slapped a flat roof on it that WILL leak in 10 - 15 years.
Edit - oh you can even see in the lowish Res photo that a shit job was done on the black render for that bay window.
Selling / sold too, off to ruin another house!