The team which builds the shrine is typically formed around a few factors. Since many of the building techniques haven't changed since the creation of the Ise Shrine, the workers who are hired to build the shrine must be skilled in specific techniques. Power tools are not allowed within the area of the shrine, which means that skilled artisans and carpenters known as "miyadaiku" are necessary in the construction process. The unit of workers is also organized around relative skill levels, and less experienced workers will work on smaller tasks than more experienced workers. The importance of hiring specifically local artisans has decreased throughout time, for the pool of available miyadaiku has thinned out. Specialized work and the specific materials come with a cost; in 2013, the shrine was built from private donations alone, totaling 57 billion Japanese Yen (US$550 million).