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

A finished, code-compliant basement or a legally permitted accessory dwelling unit can add real value to a Roswell home by converting unfinished space into counted, usable square footage, though the actual dollar impact depends on permits, finish quality, and what comparable Roswell homes with similar upgrades have sold for. An unpermitted basement conversion or an ADU built without the right zoning approval can create problems at appraisal instead of adding value. A comparative market analysis built on recent comparable sales is the reliable way to see the real number for your street.