One-off housing is a term used in Ireland to refer to the building of individual rural houses, outside of towns and villages. The term is used to contrast with housing developments where multiple units are constructed as part of a housing estate or city street. Less commonly, the term is used to refer to infill housing in suburban areas.

Other than being located outside any town or village, a typical one-off house built in the last twenty years is likely to be a bungalow of concrete block construction 1,500–2,500 square feet in floor area, with a rectangular footprint and a pitched roof.

One-off houses exist in many forms and the builder has autonomy over what design features to incorporate, in contrast to the uniform characteristics often found in more mass-produced forms of housing such as tract housing, prefabricated housing, and apartment buildings. Nevertheless, one-off construction does not guarantee any architectural merit or uniqueness as plans are readily available off the shelf.

A septic tank is used for sewage treatment, a well is drilled to provide freshwater, while a satellite dish provides television reception.

In remote areas provision of services to one-off houses using public utilities can be prohibitively expensive or simply unavailable and an alternative will need to be arranged

Government officials stated at a planning conference in 2001 that 36% of dwellings built in 2000 in Ireland were one-off houses. Recent years have seen a huge increase in the supply of all types of housing in Ireland with 547,000 houses, equivalent to a third of the total national housing stock, built in the period 1996–2006

A 2002 publication by the ESRI reported that one-third of Ireland's housing stock consists of one-off houses.

Of 11,604 houses granted planning permission in Ireland in 2010, 48% were for one-off houses.