How much does a finished basement or a legal ADU add to my Johns Island home's value?

A legal ADU tends to add more measurable value on Johns Island than a finished basement would, since basements are uncommon across the Lowcountry's high water table while an ADU creates genuine additional living or rental space that a buyer's lender can recognize. Permitting status matters enormously here, since an unpermitted structure can subtract value rather than add it. Brian Beatty checks permit records before crediting either feature in a Johns Island valuation.