Tobacco barns are an integral component of the agricultural heritage and landscape of Southern Maryland . However these barns are being lost at an alarming rate to suburban sprawl and neglect. This conceptual project is a case study in the preservation and adaptive re-use of a Southern Maryland tobacco barn. Re-Barn is quite literally a barn reborn. The architectural approach for this project involves inserting a new single family home inside the existing barn. This approach preserves the barn and agricultural heritage of the property while creating a new green home. The property can remain in use as a working farm, operated either by the home owner or through a lease to a local farmer. Re-Barn’s main gesture is to modify the skin (walls & roof) of the barn to accommodate a new home inside. Taking a cue from vernacular design of tobacco barns, the skin is modified to include flaps, shutters and sliding panels in the locations of doors and windows. When closed, Re-Barn is almost indistinguishable from a typical tobacco barn. When open, the building takes on the appearance of a contemporary home. This operability of the building’s skin gives the residents numerous options for solar control, privacy and an ever changing appearance to the home. Sustainable features include: preservation and adaptation of an existing historic structure reduces material required for construction while also providing control strategies for a passive solar design. A solar array (PV and thermal) as well as rainwater catchment are integrated into the existing roof . A constructed wetland naturally treats wastewater on site.