A residential area is a land use in which housing predominates, as opposed to industrial and commercial areas. Housing may vary significantly between, and through, residential areas. These include single-family housing, multi-family residential, or mobile homes. Zoning for residential use may permit some services or work opportunities or may totally exclude business and industry. It may permit high density land use or only permit low density uses. Residential zoning usually includes a smaller FAR (floor area ratio) than business, commercial or industrial/manufacturing zoning. The area may be large or small.
Gross Residential area (GRA) in real estate is the total Residential area inside the building envelope, including the external walls, and excluding the roof. Definitions of GRA, including which areas are to be counted towards it and which areas are not, vary around the world.