Infill housing
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Infill housing is the insertion of additional housing units into an already approved subdivision or community. These can be in the form of additional units built on the same lot, by dividing existing homes into multiple units, or by creating new residential lots by further subdivision or lot line adjustments. Units may also be used by building on what is otherwise waste land of various kinds.
The advantage of infill housing is in the fact that it does not require the subdivision of natural areas, or prime agricultural land. Another advantage is that existing infrastructure is usually almost adequate to provide all the need for utility and other services, at least at first glance.
Possible disadvantages are higher density of housing units per acre, and units that are not "up to code" or create circumstances that are illegal or unsafe. Especially if the infill was done without supervision or inspection.