An under-improvement refers to a condition in which a property’s existing improvements do not fully reflect the potential supported by the land and surrounding market. The site may be capable of supporting a more valuable or higher use than what currently exists.
A common example is a small, outdated structure on a large parcel in an area of larger or more modern homes. In appraisal, under-improvement is considered in the context of highest and best use, which evaluates whether the current use is legally permissible, physically possible, financially feasible and maximally productive. If it is not, that conclusion informs the valuation analysis.
Under-improved properties may present redevelopment or renovation potential, but they can also introduce uncertainty in valuation, particularly when future costs and market response are difficult to measure.