A prefabricated building, informally a prefab building, is a type of building that consists of several factory-built components or units that are assembled on-site to complete the unit.
Buildings have been built in one place and reassembled in another throughout history. Possibly the first advertised prefab house was the "Manning cottage". A London carpenter, Henry Manning, constructed a house that was built in components, then shipped and assembled by British emigrants. This was published at the time (advertisement, South Australian Record, 1837) and a few still stand in Australia. One such is the Friends Meeting House, Adelaide.
The peak year for the importation of portable buildings to Australia was 1853, when several hundred arrived. These have been identified as coming from Liverpool, Boston and Singapore (with Chinese instructions for re-assembly). In Barbados the Chattel house was a form of prefabricated building which was developed by emancipated slaves who had limited rights to build upon land they did not own. As the buildings were moveable they were legally regarded as chattels.
In 1855 during the Crimean War, after Florence Nightingale wrote a letter to The Times, Isambard Kingdom Brunel was commissioned to design a prefabricated modular hospital. In five months he designed a 1,000 patient hospital, with innovations in sanitation, ventilation and a flushing toilet. Fabricator William Eassie constructed the required 16 units in Gloucester Docks, shipped directly to the Dardanelles. Only used from March 1856 to September 1857, it reduced the death rate from 42% to 3.5%.
The world's first prefabricated, pre-cast panelled apartment blocks were pioneered in Liverpool. A process was invented by city engineer John Alexander Brodie, whose inventive genius also had him inventing the football goal net. The tram stables at Walton in Liverpool followed in 1906. The idea was not extensively adopted in Britain, however was widely adopted elsewhere, particularly in Eastern Europe.
Prefabricated homes were produced during the Gold Rush in the United States, when kits were produced to enable Californian prospectors to quickly construct accommodation. Homes were available in kit form by mail order in the United States in 1908.
Prefabricated housing was popular during the Second World War due to the need for mass accommodation for military personnel. The United States used Quonset huts as military buildings, and in the United Kingdom prefabricated buildings used included Nissen huts and Bellman Hangars. 'Prefabs' were built after the war as a means of quickly and cheaply providing quality housing as a replacement for the housing destroyed during the Blitz. The proliferation of prefabricated housing across the country was a result of the Burt Committee and the Housing (Temporary Accommodation) Act 1944. Under the Ministry of Works Emergency Factory Made housing programme, a specification was drawn up and bid on by various private construction and manufacturing companies. After approval by the MoW, companies could bid on Council led development schemes, resulting in whole estates of prefabs constructed to provide accommodation for those made homeless by the War and ongoing slum clearance. Almost 160,000 had been built in the UK by 1948 at a cost of close to £216 million. The largest single prefab estate in Britain was at Belle Vale (South Liverpool), where more than 1,100 were built after World War 2. The estate was demolished in the 1960s amid much controversy as the prefabs were very popular with residents at the time.
Prefabs were aimed at families, and typically had an entrance hall, two bedrooms (parents and children), a bathroom (a room with a bath) — which was a novel innovation for many Britons at that time, a separate toilet, a living room and an equipped (not fitted in the modern sense) kitchen. Construction materials included steel, aluminium, timber or asbestos, depending on the type of dwelling. The aluminium Type B2 prefab was produced as four pre-assembled sections which could be transported by lorry anywhere in the country.
The Universal House (pictured left & lounge diner right) was given to the Chiltern Open Air Museum after 40 years temporary use. The Mark 3 was manufactured by the Universal Housing Company Ltd, Rickmansworth.
The United States used prefabricated housing for troops during the war and for GIs returning home. Prefab classrooms were popular with UK schools increasing their rolls during the baby boom of the 1950s and 1960s.
Many buildings were designed with a five-ten year life span, but have far exceeded this, with a number surviving today. In 2002, for example, the city of Bristol still had residents living in 700 examples. Many UK councils have been in the process of demolishing the last surviving examples of Second World War prefabs in order to comply with the British government's Decent Homes Standard, which came into effect in 2010. There has, however, been a recent revival in prefabricated methods of construction in order to compensate for the United Kingdom's current housing shortage.
Prefabs and the modernist movement
Architects are incorporating modern designs into the prefabricated houses of today. Prefab housing should no longer be compared to a mobile home in terms of appearance, but to that of a complex modernist design. There has also been an increase in the use of "green" materials in the construction of these prefab houses. Consumers can easily select between different environmentally friendly finishes and wall systems. Since these homes are built in parts, it is easy for a home owner to add additional rooms or even solar panels to the roofs. Many prefab houses can be customized to the client's specific location and climate, making prefab homes much more flexible and modern than before.
There is a zeitgeist in architectural circles and the spirit of the age favors the small carbon footprint of "prefab." Eminent amongst the new breed of off the shelf luxury modernist products is the perrinepod, which has found favor worldwide for its green credentials and three day build time.
Prefabricated commercial buildings
In the UK, the major supermarkets have each developed a modular unit system to shop building, based on the systems developed by German cost retailler Aldi and the Danish supermarket chain Netto.
- Prefab: From Utilitarian Home To Design Icon, by Jim Zarroli, Morning Edition, September 15, 2008, NPR
- Channel 9 South Australia Pty Ltd > Postcards > Friend's Meeting House Retrieved 8 September 2011
- http://www.environment.nsw.gov.au/resources/parks/CoolamineSection3.pdf This reference has a contemporary sketch and recent photograph of the Friends' Meeting House
- Lewis, Miles (1985). "The Diagnosis of Prefabricated Buildings" (PDF). Australian Historical Archaeology 3: 58–68.
- Ali, Arif (1996). Barbados: Just Beyond Your Imagination. Hansib Caribbean. Hansib. ISBN 1-870518-54-3.
- Renkioi: Brunel's Forgotten Crimean War Hospital by Christopher Silver
- Belle Vale, Liverpool
- Gillilan, Lesley (March 23, 2002). "The prefab four". The Daily Telegraph (London). Retrieved May 22, 2010.
- "New age of the prefab house". This is Money.
- "Transportable Homes, Explained". Transportable home finance. Retrieved 2008-11-26.
- "PREFAB FRIDAY: Perrinepod". inhabitat.com.
|Wikimedia Commons has media related to Prefabricated buildings.|
- National Association of Home Builders (US) - "NAHB's Building Systems Council's Concrete, Log, Modular, and Panelized Homes
- Estate of Prefabs in SE London is listed for preservation
- Full questions and answers to building a prefab home
- Article about Mobilhome Corporation of America, which sold completely prefabricated homes from 1946-1952