
A basement apartment or basement flat is an
apartment
An apartment (American English, Canadian English), flat (British English, Indian English, South African English), tenement (Scots English), or unit (Australian English) is a self-contained housing unit (a type of residential real estate) that ...
located below
street
A street is a public thoroughfare in a city, town or village, typically lined with Building, buildings on one or both sides. Streets often include pavements (sidewalks), pedestrian crossings, and sometimes amenities like Street light, streetligh ...
level, underneath another structure—usually an
apartment building
An apartment (American English, Canadian English), flat (British English, Indian English, South African English), tenement ( Scots English), or unit (Australian English) is a self-contained housing unit (a type of residential real estate) ...
, but possibly a
house
A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation, and air c ...
or a business. Cities in North America are beginning to recognize these units as a vital source of housing in urban areas and legally define them as an
accessory dwelling unit or "ADU".
Rent in basement apartments is usually much lower than it is in above-ground units, due to a number of deficiencies common to basement apartments. The apartments are usually cramped, and tend to be noisy, both from uninsulated building noises and from traffic on the adjacent street.
[David W. Chen]
Be It Ever So Low, the Basement Is Often Home
''The New York Times
''The New York Times'' (''NYT'') is an American daily newspaper based in New York City. ''The New York Times'' covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of ...
'' (February 25, 2004). They are also particularly vulnerable to
burglary
Burglary, also called breaking and entering (B&E) or housebreaking, is a property crime involving the illegal entry into a building or other area without permission, typically with the intention of committing a further criminal offence. Usually ...
, especially those with windows at sidewalk level. In some instances, residential use of below-ground space is illegal, but is done anyway in order for the building owner to generate extra income.
Homeowners will typically rent out basement apartments to tenants as a way to earn additional income so as to offset living expenses. Owning a home with a basement apartment can be an investment. Tenants will provide income to the home owner, reducing expenses, and equity will grow as the value of the property increases.
__NOTOC__
Health risks to tenants

Some health risks to people who live in basements have been noted, for example
mold
A mold () or mould () is one of the structures that certain fungus, fungi can form. The dust-like, colored appearance of molds is due to the formation of Spore#Fungi, spores containing Secondary metabolite#Fungal secondary metabolites, fungal ...
,
radon
Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only Rn has a sufficiently long half-life (3.825 days) for it to b ...
, and risk of injury/death due to fire. It has been suggested that a basement suite is the last type of dwelling a tenant should look for because of the risk of mold.
However, due to demand for affordable housing, basement suites are often the only available housing for some low-income families and individuals.
Airborne spores can cause mold to grow in damp and unventilated areas, such as basements.
Presence of mold can lead to "respiratory symptoms, respiratory infections, allergic rhinitis and asthma", as well as personal belongings being contaminated by mold.
Basement suite tenants are more likely to be injured or die due to a fire in the house. Many landlords do not follow fire code regulations, and often such regulations are not enforced by governments.
During flooding, these apartments are extremely dangerous. When
Hurricane Ida passed over the northeast of the United States as an extratropical storm, most of the deaths were caused due to flooding in basement apartments.
Notable people
A number of noted artistic achievements have occurred in basement apartments occupied by struggling authors, painters, and musicians.
Andy Warhol
Andy Warhol (;''Random House Webster's Unabridged Dictionary''"Warhol" born Andrew Warhola Jr.; August 6, 1928 – February 22, 1987) was an American visual artist, film director and producer. A leading figure in the pop art movement, Warhol ...
made one of his earliest films, ''Mrs. Warhol'' (black-and-white, 66 minutes), in the basement apartment of his house, where his mother (
Julia Warhola) lived.
Ruth McKenney
Ruth Marguerite McKenney (November 18, 1911 – July 25, 1972) was an American author and journalist, best remembered for ''My Sister Eileen'', a memoir of her experiences growing up in Ohio and moving to Greenwich Village with her sister Eileen ...
based a series of stories in ''
The New Yorker
''The New Yorker'' is an American magazine featuring journalism, commentary, criticism, essays, fiction, satire, cartoons, and poetry. It was founded on February 21, 1925, by Harold Ross and his wife Jane Grant, a reporter for ''The New York T ...
'', later republished in the book ''
My Sister Eileen'', on her experiences living with her sister in a moldy, one-room basement apartment, directly adjoining the
Christopher Street subway station on the , at 14
Gay Street, in
Greenwich Village
Greenwich Village, or simply the Village, is a neighborhood on the west side of Lower Manhattan in New York City, bounded by 14th Street (Manhattan), 14th Street to the north, Broadway (Manhattan), Broadway to the east, Houston Street to the s ...
for which she paid $45 a month ().
[''My Sister Eileen'', pg. 197.] The apartment was burgled within the first week during the six months they lived there.
See also
*
English basement
An English basement is an apartment (flat in UK English) on the lowest floor of a building, generally a townhouse or brownstone, which is partially below and partially above ground level and which has its own entrance, separate from those of the re ...
*
Penthouse apartment
A penthouse is an apartment or unit traditionally on the highest floor of an apartment building, condominium, hotel, or tower. Penthouses are typically differentiated from other apartments by luxury features. The term 'penthouse' originally re ...
References
{{Real estate developments
Apartment types
Subterranea (geography)