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GENERAL BUILDING HEIGHTS AND AREAS

506.1.3 Basements. Basements need not be included in throughout with an automatic sprinkler system
the total allowable floor area of a building provided the installed in accordance with Section 903.3.1.2, use
total area of such basements does not exceed the area per- the actual number of building stories above grade
mitted for a one-story above grade plane building. plane, not to exceed four.
506.2 Allowable area determination. The allowable area of No individual story shall exceed the allowable area (A )
a
a building shall be determined in accordance with the appli- as determined by Equation 5-2 using the value of S = 1.
a
cable provisions of Sections 506.2.1 through 506.2.4 and 506.2.4 Mixed-occupancy, multistory buildings. Each
Section 506.3. story of a mixed-occupancy building with more than one
506.2.1 Single-occupancy, one-story buildings. The story above grade plane shall individually comply with
allowable area of a single-occupancy building with no the applicable requirements of Section 508.1. For build-
more than one story above grade plane shall be deter- ings with more than three stories above grade plane, the
mined in accordance with Equation 5-1: total building area shall be such that the aggregate sum of
the ratios of the actual area of each story divided by the
A = A + (NS × I ) (Equation 5-1)
a t f allowable area of such stories, determined in accordance
where: with Equation 5-3 based on the applicable provisions of
A = Allowable area (square feet). Section 508.1, shall not exceed three.
a
A = Tabular allowable area factor (NS, S1, S13R or A = [A + (NS × I )] (Equation 5-3)
t a t f
S13D value, as applicable) in accordance with Table where:
506.2.
A = Allowable area (square feet).
a
NS = Tabular allowable area factor in accordance with A = Tabular allowable area factor (NS, S13R, S13D or
Table 506.2 for nonsprinklered building (regardless t SM value, as applicable) in accordance with Table
of whether the building is sprinklered).
506.2.
I = Area factor increase due to frontage (percent) as
f NS = Tabular allowable area factor in accordance with
calculated in accordance with Section 506.3. Table 506.2 for a nonsprinklered building
506.2.2 Mixed-occupancy, one-story buildings. The (regardless of whether the building is sprinklered).
allowable area of a mixed-occupancy building with no
more than one story above grade plane shall be deter- I = Area factor increase due to frontage (percent) as
f
mined in accordance with the applicable provisions of calculated in accordance with Section 506.3.
Section 508.1 based on Equation 5-1 for each applicable Exception: For buildings designed as separated occu-
occupancy. pancies under Section 508.4 and equipped throughout
506.2.2.1 Group H-2 or H-3 mixed occupancies. For with an automatic sprinkler system installed in accor-
a building containing Group H-2 or H-3 occupancies, dance with Section 903.3.1.2, the total building area
the allowable area shall be determined in accordance shall be such that the aggregate sum of the ratios of the
with Section 508.4.2, with the sprinkler system actual area of each story divided by the allowable area
increase applicable only to the portions of the building of such stories determined in accordance with Equation
not classified as Group H-2 or H-3. 5-3 based on the applicable provisions of Section
506.2.3 Single-occupancy, multistory buildings. The 508.1, shall not exceed four.
allowable area of a single-occupancy building with more 506.2.4.1 Group H-2 or H-3 mixed occupancies. For
than one story above grade plane shall be determined in a building containing Group H-2 or H-3 occupancies,
accordance with Equation 5-2: the allowable area shall be determined in accordance
with Section 508.4.2, with the sprinkler system
A = [A + (NS × I )] × S (Equation 5-2) increase applicable only to the portions of the building
a
a
t
f
where: not classified as Group H-2 or H-3.
A = Allowable area (square feet). 506.3 Frontage increase. Every building shall adjoin or have
a access to a public way to receive an area factor increase based
A = Tabular allowable area factor (NS, S13R, S13D or
t on frontage. Area factor increase shall be determined in
SM value, as applicable) in accordance with Table
506.2. accordance with Sections 506.3.1 through 506.3.3.
506.3.1 Minimum percentage of perimeter. To qualify
NS = Tabular allowable area factor in accordance with
Table 506.2 for a nonsprinklered building for an area factor increase based on frontage, a building
(regardless of whether the building is sprinklered). shall have not less than 25 percent of its perimeter on a
public way or open space. Such open space shall be either
I = Area factor increase due to frontage (percent) as on the same lot or dedicated for public use and shall be
f
calculated in accordance with Section 506.3. accessed from a street or approved fire lane.
S = Actual number of building stories above grade
a
plane, not to exceed three. For buildings equipped

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