Underground Apartment Ordinance

• We have partially revised the Broom Condominium Ordinance. Along with this, the Broom Condominium Ordinance and the commentary have been partially revised. （R1.6.14）

　In recent years, there have been many disputes in slope green spaces in the city regarding "baroom apartments", which is considerably larger than the surrounding living environment.
　This is due to the revision of the Building Standards Law in 1994, the floor area ratio of the basement of the house has been reduced uniformly throughout the country, and even in low-rise residential areas that can only be built up to three floors above the ground on flat land, it is actually This is because it can be built even in middle- and high-rise apartments. In recent years, there has been an increase in the number of extreme cases that make full use of the mitigation system.
　In Yokohama City, in order to harmonize with neighboring neighborhoods and guide building activities that take into account a good living environment, we have begun to create Yokohama's unique rules for "basement condominiums." In making these rules, we organized a cross-sectional study team within the agency, set up a study group with academics, scrutinized all issues, and examined methods including ordinances. On October 16, 2003, a study group received a proposal from the study group on how to regulate basement apartments using slopes.
　Based on this proposal, the "Ordinance on Restrictions on Construction and Development of Border Buildings on Slope of Yokohama City" was issued on March 5, 2004 with the aim of harmonizing the basement apartments and the surrounding living environment. It was promulgated on the day and came into effect on June 1 of the same year.

• Ordinance　Overview (PDF: 269KB)／Text (outside site)(To the collection of regulations)
• Enforcement Rules　Overview (PDF: 256KB)／Text (outside site)(To the collection of regulations)
• Explanation (PDF: 1,129KB)　June 2019 version (enforced on June 14, 2019)

　The ordinance was partially revised on June 14, 2019. Along with this, the article-by-article commentary was partially revised on the same day. (Effective on June 14, 2019)　

• Ordinance New and Old Comparison Table (PDF: 214KB)
• Commentary New and Old Comparison Table (PDF: 377KB)

　On October 28, 2015, the commentary on each article was partially revised, and the examination criteria were added and clarified. (Effective on February 1, 2016)

• Outline of the revision of each article (PDF: 361KB)

　Along with a partial revision of the Building Standards Law on June 4, 2014 (enforced on June 1, 2015), the ordinance was partially revised on May 29, 2015. . (Effective on June 1, 2015)

• Outline of Ordinance Revision (PDF: 302KB)
• Ordinance New and Old Comparison Table (PDF: 136KB)

• Ordinance (outside site) about adjustment of Yokohama-shi development business(To the collection of regulations)
• Ordinance (outside site) on conservation, etc. of living environment pertaining to construction and development projects such as middle-high-rise buildings in Yokohama City(To the collection of regulations)
• Designation of ground surface based on Building Standard Act (Building Standards Ordinance Article 4-5)
• Restrictions in scenic areas (Building Planning Division, Building Environment Section)