I would like to build imported housing. What are the procedures required? 

There are no particular restrictions regarding importation of housing, but upon construction, the Building Standards Law must be followed. In addition, when constructing or buying/selling new housing, the constructor is liable to defect warranty, for a certain period of time, for the fundamental structure of the housing.

1. Important standards which must be complied with under the Building Standards Law are those for method of construction, fire prevention, etc., and sick-house issues.
In terms of structural method of construction, technical standards regarding wood-frame construction or log structures (such as in log cabins), which are provided in Ministerial Notification from the Ministry of Land, Infrastructure and Construction, must be met. If not, then approval from the Minister is required.

2. Some materials may also be subject to additional Ministerial approval for requirements regarding performance standards for fire prevention, depending on the construction including its scale and use. For use of materials containing chemicals such as formaldehyde and chlorpyrifos, regulations set out prohibition of use of chlorpyrifos in habitable rooms, and mandatory installation of ventilation equipment upon use of formaldehyde.

3. As for the Housing Quality Assurance Law, construction companies are liable for defect warranty in fundamental structures of new housing being constructed or being sold and bought, a liability whose period is set at 10 years. In addition, a voluntary system of housing performance labeling is established, setting new labeling standards for performance to enable comparison before contracting, and also setting up third-party agencies that conduct objective evaluation of performance.