extruberescence - (n) - an architectural feature, usually an addition, which does not match the original style of the building to which it is attached, in an unattractive and particularly noticeable manner. Also: a general term for an architectural crime.
Example: "Ooo, what a
lovely Craftsman!" "Wait, what's that extruberescence on the side of
the house?" "MY GOD, it's a vinyl-sided hot tub enclosure with sliding