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The handling of light regulation

Last update date March 11, 2019

4 of Yokohama-shi building standard regulations Article 4 is commentary about "we appoint at areas about limit of height of building and light time by light" by regulations of 2 Paragraph 1 of Building Standard Act Article 56.

Target building and regulation time for light regulation

Target building and table about regulation time of light regulation
Area or areaWe are subject to limit
Building
Of light
The measurement side
It is height of this
From site border
Of 5-10m
Light time of range
From site border
We exceed 10m
Light time of range
Two kinds of first low-rise building exclusive residential districts
(except 150% of floor area ratio)
The amount of eaves building more than 7m or building with ground number of floors 3 or more1.5mThree hoursTwo hours
The second kind low-rise building exclusive residential district
(150% of floor area ratio)
Four hours2.5 hours
Area without designation of restricted zone
(general area)
Three hoursTwo hours
The first exclusive residential district high-rise in two kindsHeight 10m
Building to exceed
4.0mThree hoursTwo hours
Two kinds of first residential areas
Associate residential area
Four hours2.5 hours
Neighborhood business district
(200% of floor area ratio)
Five hoursThree hours
Associate industrial district
(200% of floor area ratio)
Five hoursThree hours
Area without designation of restricted zone
(area of 50m along main line street)
Four hours2.5 hours

Light data (standard process of Yokohama-shi, 139 degrees E 39', data in 35 degrees N 40' of winter solstice day

Table of light data of winter solstice day
Apparent solar time8:008:309:009:3010:0010:3011:0011:3012:00
16:0015:3015:0014:3014:0013:3013:0012:30Unavailable
The sun magnetic declination53.3748.2842.7636.7630.2523.2415.787.990
Magnification of light7.0404.4003.2402.6002.2021.9501.7901.7001.672

We ask for coloring of list shown below to facilitate the identification when light line is complicated in Yokohama-shi.

Coloring list of light line
The time8:009:0010:0011:0012:0013:0014:0015:0016:00
ColorTeaGreenSour orangeBlueRedIndigo plantYellowPurplePeach

Precaution of light regulation

  • Building (2 Paragraph 2 of Building Standard Act Article 56) in equivalence site
    As these buildings are considered to be one building when 2 or more buildings are in equivalence site (when indivisible in use), if there are any buildings to be for, the whole building in site will receive application of light regulation, and examination that existing ridge included is necessary for existing ridge even if it is building that it is not intended in application object ridge alone.
  • Exception (2 Paragraph 4 of Building Standard Act Article 56) of area, building of area which light regulation is not applied to
    When we give light to regulation prediction areas, area even if it is building out of the area, regulation is applied prediction areas of light regulation. For example, plan place is the prediction areas outside (business district), but, in the case of the chart below, examination is necessary about each regulation level as light amounts to the first kind house for exclusive use of high-rise house, each area of neighborhood commerce among the first species which are prediction areas.

    When we plan building more than 10m in height in business district

  • When target building or the light is introduced to different area, area of limit (2 Paragraph 5 of Building Standard Act Article 56)
    • When target building is introduced to different area, area of limit, object building considers that there is in each area, area, and regulation is applied.
    • When light of target building is introduced to different area, area of limit, object building considers that there is in each area causing light, and regulation is applied.
      For example, light amounts to each area of neighborhood commerce for exclusive use of the second kind house for exclusive use of high-rise house among the second species, but height is within 10m, and, in the case of the chart below 1, examination is necessary for their local object building as it is not only by being accompanied in the first kind low-rise building exclusive residential district.
      In addition, examination is necessary about local regulation level of each as it is all local target buildings which light extends to in the case of the chart below 2.

      When, more than eaves high 7m, we plan building less than 10m in height in the first kind low-rise building exclusive residential district

      When we plan building more than 10m in height in neighborhood business district

Inquiry to this page

Housing and Architecture Bureau architecture leadership Building Guidance Division

Telephone: 045-671-4531

Telephone: 045-671-4531

Fax: 045-681-2437

E-Mail address [email protected]

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