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About law pertaining to construction, development
Laws pertaining to construction, development, etc., include the Building Standards Law, the City Planning Act, and the Residential Land Development Regulation Law. These laws set standards for protecting the lives, health and property of citizens and harmonize the city. Failure to comply with these standards may result in violation buildings and violations, which may have a significant impact on the life, health, and property of users and third parties, and may cause neighborhood troubles. Therefore, we ask that all of you to comply with all laws and regulations and cooperate in preventing violations. If you have any questions, please contact an expert.
Last update date May 12, 2023
- About Building Standard Law
- About the City Planning Act
- About residential land development regulation law
- About precautions when we build building or use change
- Frequently Asked Questions (Frequently Violations, etc.)
About Building Standard Law
The Building Standards Law stipulates minimum standards for building sites, structures, facilities and uses of buildings.
Figure left: Structure Safety, Medium Figure: Safety of fire prevention and evacuation, right figure: Environmental Health
| Structure safety | Safety of fire prevention and evacuation | Environmental Health |
|---|---|---|
| This is a standard for building buildings that are resistant to earthquakes, etc. Even small extensions must adhere to the standards. | This is a standard for building a fire-resistant building. You must prevent burning and collapse so that you can evacuate safely. | This is a standard for ensuring a comfortable indoor environment and living healthy. The size of the window and the height of the ceiling are determined. |
Figure left: Roads and Sites, Medium Figure: Use of the building, right figure: The height and area of buildings
| Roads and Sites | Use of buildings | The height and area of buildings |
|---|---|---|
| This is a standard for evacuation from buildings, comfortable traffic and firefighting activities. The site must be in contact with a road at least 4 meters wide. （※１） | This is a standard for protecting the characteristics of the region. Use, scale, etc. of buildings are determined for each region. | This standard is used to protect the environment, such as sunshine and ventilation to the neighborhood. The height and area of buildings are determined for each area. |
※1 If the width of the road in contact with the site is less than 4 meters, the building and gate wall must be retreated.
About procedure of building
According to the Building Standards Law, if you are going to build a building (new construction, extension, renovation, etc.) or change the use in order to confirm the safety and performance of the building, the plan conforms to the Building Standards Law and related regulations It is stipulated that construction should be started after confirming in advance whether it conforms to the above. In addition, after construction is completed, it is necessary to undergo an inspection.
If you do not confirm these, the building may be violated, so be sure to consult with an architect and proceed with the procedure.
About procedure when we build building
Don't make an extension without necessary/required procedures
Applications that require procedures when changing usage
When changing the use of an existing building, as an example, the total floor area of the part to be used as shown in the figure (referred to as a "special building") and the total floor area of the part to be used for that purpose is 200 m2 Those that exceed the above, procedures are required (excluding changes to the same use or change of use between similar uses).
Figure: Examples of special buildings
Figure left: Theaters, movie theaters, meeting places, etc. Medium figure: Hotels, inns, etc. Right figure: Hospital, clinics, etc.
Figure left: Apartment houses and dormitories, etc. Medium figure: Restaurants and merchandise stores, etc. Right figure: Warehouse, etc.
Contact information
General consultation and window guidance on construction and residential land
About the City Planning Act
The City Planning Act stipulates standards for city planning to promote sound development and orderly maintenance of cities.
About building in urbanization adjustment area
In Yokohama, the entire city is divided into an urbanization area and an urbanization adjustment area based on the City Planning Act, and 1/4 is designated as an urbanization adjustment area.
The urbanization adjustment area is an area established based on the City Planning Act as an area where urbanization should be suppressed, and in principle, buildings cannot be built.
It is sold in a state where land such as forests in the urbanization control area is maintained and leveled, and there are many cases of trouble.
If you plan to build a building on these lands, be sure to check with an expert.
In addition, please talk with Housing and Architecture Bureau residential land examination department adjustment area section by all means if you are unsure.
Construction in urbanization control areas is prohibited in principle.
Figure of urbanization area and urbanization adjustment area
Precautions at the time of construction in the urbanization control area (PDF: 255KB)
Example treated as a building (PDF: 298KB)
Contact information
Residential land examination department (inquiry and consultation on adjustment areas, etc.)
About residential land development regulation law
The Residential Land Development Regulation Law stipulates necessary standards for preventing disasters due to landslides or runoff of sediment associated with residential land development.
About the regulation law procedure such as residential land development
In Yokohama City, about two-thirds of the city area area is designated as a residential land development construction restricted area based on the Regulation Law for Residential Land Development. Must be done.
Please refer to the following website for definitions and detailed overview of terms such as cliffs.
In addition, if you have any questions, please consult the Housing and Architecture Bureau Residential Land Examination Department Residential Land Examination Division.
Landslides caused by heavy rain
Figure of residential land development construction restricted area
Outline of the Regulation Law for Residential Land Development (Definition of terms and construction related to target residential land development, etc.)
Outline of Regulation Law for Residential Land Development
Contact information
About videos and leaflets
To avoid violations (buildings, land development, etc.)
FAQs
We are considering installing storerooms and carports. Do I need to do it?
Building refers to thing having roof and pillar or wall (including fence or gate) among public works fixed on land. Therefore, sheds and carports are treated as buildings, in principle, regardless of the basis. When considering purchasing, check with an architect or other expert about necessary/required procedures.
Examples of violating buildings (steel storage, carports, prefabricated unit house, simple roofing)
I'm thinking of purchasing a building (new construction / used). Is there anything to be careful?
When purchasing, please make sure that a certificate of confirmation and inspection have been issued. (Confirmation certificate and inspection certificate are issued to the builder.)
About record of grant, we can investigate in Housing and Architecture Bureau Information Consultation Section on the next agency.
In addition, a certificate of confirmation and inspection are required in principle each time a new construction or extension is performed.
In addition, it is safer to ask an architect or other expert to conduct a survey before purchasing.
About certification, reading about construction and development
Where can I find the rules of the area where I live?
Please refer to the information about your area.
i-mappy (Yokohama City Administrative Map Information Providing System Town Development Map Information)
You can check it.
Other common questions such as architecture and development are introduced at the link below.
Frequently Asked Questions such as Architecture and Development
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For inquiries to this page
Violation Countermeasures Section, Housing and Architecture Bureau Building Inspection Department
Phone: 045-671-3856
Phone: 045-671-3856
Fax: 045-664-2667
Email address: kc-ihanzesei@city.yokohama.jp
Page ID: 587-370-427
