Again your barking up the wrong tree. There is no mention by the poster of selling the property which is where the folks in your link are headed.

Again the question is "do you have any relevant suggestions regarding the subject "What is the "going rate" for an home alterations?"

Please try to stay on topic.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….