A barn raising, also historically called a raising bee or rearing in the U.K., is a collective action of a community, in which a barn for one of the members is built or rebuilt collectively by members of the community. Barn raising was particularly common in 18th- and 19th-century rural North America. A barn was a necessary structure for any farmer, for example for storage of cereals and hay and keeping of animals. Yet a barn was also a large and costly structure, the assembly of which required more labor than a typical family could provide. Barn raising addressed the need by enlisting members of the community, unpaid, to assist in the building of their neighbors' barns. Because each member was entitled to recruit others for help, the favor would eventually return to each participant.
The tradition of "barn raising" continues, more or less unchanged, in some Amish and Old Order Mennonite communities, particularly in Ohio, Indiana, Pennsylvania, and some rural parts of Canada. The practice continues outside of these religious communities, albeit less frequently than in the 19th century. Most frames today are raised using a crane and small crew.
A large amount of preparation is done before the one to two days a barn raising requires. Lumber and hardware are laid in, plans are made, ground is cleared, and tradesmen are hired. Materials are purchased or traded for by the family who will own the barn once it is complete.
Generally, participation is mandatory for community members. These participants are not paid. All able-bodied members of the community are expected to attend. Failure to attend a barn raising without the best of reasons leads to censure within the community. Some specialists brought in from other communities for direction or joinery may be paid, however.
One or more people with prior experience or with specific skills are chosen to lead the project. Older people who have participated in many barn raisings are crew chiefs. On the whole, the affair is well organized. At most barn raisings, the community members have raised barns before and approach the task with experience both in the individual tasks and the necessary organization. Young people participating physically for the first time have watched many barn raisings and know what is expected of them.
Only certain specialists are permitted to work on the more critical jobs, such as the joinery and dowling of the beams. (Post and beam construction is the traditional method of construction in barn raisings.) There is competition for these jobs, and they are sought after. Workers are differentiated by age and gender: men construct the barn, women provide water and food, the youngest children watch, and older boys are assigned to fetch parts and tools.