I do agree with Dave, it does depend on what you regard as being derelict. As he mentioned, something can be seen as derelict but still being occupied or, it can be abandoned and derelict. Each would need to be treated differently to the other. It will also depend on what the kit is made from, styrene/ABS or Wood.
My thoughts would be to build the kit in accordance with the instructions, perhaps leaving out a window and/or door or putting them in crooked etc, then weather it to suit. If you don't like the end result, you then have the option of "breaking it" to make it look more derelict.