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SECTION 503 GENERAL BUILDING HEIGHT AND AREA LIMITATIONS

TABLE 503 ALLOWABLE BUILDING HEIGHTS AND AREASa, b Building height limitations shown in feet above grade plane. Story limitations shown as stories above grade plane. Building area limitations shown in square feet, as determined by the definition of "Area, building," per story


GROUP TYPE OF CONSTRUCTION
TYPE I TYPE II TYPE III TYPE IV TYPE V
A B A B A B HT A B
HEIGHT (feet) UL 160 65 55 65 55 65 50 40
STORIES(S)
AREA (A)
A-1 S
A
UL
UL
5
UL
3
15,500
2
8,500
3
14,000
2
8,500
3
15,000
2
11,500
1
5,500
A-2 S
A
UL
UL
11
UL
3
15,500
2
9,500
3
14,000
2
9,500
3
15,000
2
11,500
1
6,000
A-3 S
A
UL
UL
11
UL
3
15,500
2
9,500
3
14,000
2
9,500
3
15,000
2
11,500
1
6,000
A-4 S
A
UL
UL
11
UL
3
15,500
2
9,500
3
14,000
2
9,500
3
15,000
2
11,500
1
6,000
A-5 S
A
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
B S
A
UL
UL
11
UL
5
37,500
3
23,000
5
28,500
3
19,000
5
36,000
3
18,000
2
9,000
E S
A
UL
UL
5
UL
3
26,500
2
14,500
3
23,500
2
14,500
3
25,500
1
18,500
1
9,500
F-1 S
A
UL
UL
11
UL
4
25,000
2
15,500
3
19,000
2
12,000
4
33,500
2
14,000
1
8,500
F-2 S
A
UL
UL
11
UL
5
37,500
3
23,000
4
28,500
3
18,000
5
50,500
3
21,000
2
13,000
H-1 S
A
1
21,000
1
16,500
1
11,000
1
7,000
1
9,500
1
7,000
1
10,500
1
7,500
NP
NP
H-2 S
A
UL
21,000
3
16,500
2
11,000
1
7,000
2
9,500
1
7,000
2
10,500
1
7,500
1
3,000
H-3 S
A
UL
UL
6
60,000
4
26,500
2
14,000
4
17,500
2
13,000
4
25,500
2
10,000
1
5,000
H-4 S
A
UL
UL
7
UL
5
37,500
3
17,500
5
28,500
3
17,500
5
36,000
3
18,000
2
6,500
H-5 S
A
4
UL
4
UL
3
37,500
3
23,000
3
28,500
3
19,000
3
36,000
3
18,000
2
9,000
I-1 S
A
UL
UL
9
55,000
4
19,000
3
10,000
4
16,500
3
10,000
4
18,000
3
10,500
2
4,500
I-2 S
A
UL
UL
4
UL
2
15,000
1
11,000
1
12,000
NP
NP
1
12,000
1
9,500
NP
NP
I-3 S
A
UL
UL
4
UL
2
15,000
1
10,000
2
10,500
1
7,500
2
12,000
2
7,500
1
5,000
I-4 S
A
UL
UL
5
60,500
3
26,500
2
13,000
3
23,500
2
13,000
3
25,500
1
18,500
1
9,000

(continued)


TABLE 503—continued ALLOWABLE BUILDING HEIGHTS AND AREASa, b


GROUP TYPE OF CONSTRUCTION
TYPE I TYPE II TYPE III TYPE IV TYPE V
A B A B A B HT A B
HEIGHT (feet) UL 160 65 55 65 55 65 50 40
STORIES(S)
AREA (A)
M S
A
UL
UL
11
UL
4
21,500
2
12,500
4
18,500
2
12,500
4
20,500
3
14,000
1
9,000
R-1 S
A
UL
UL
11
UL
4
24,000
4
16,000
4
24,000
4
16,000
4
20,500
3
12,000
2
7,000
R-2 S
A
UL
UL
11
UL
4
24,000
4
16,000
4
24,000
4
16,000
4
20,500
3
12,000
2
7,000
R-3 S
A
UL
UL
11
UL
4
UL
4
UL
4
UL
4
UL
4
UL
3
UL
3
UL
R-4 S
A
UL
UL
11
UL
4
24,000
4
16,000
4
24,000
4
16,000
4
20,500
3
12,000
2
7,000
S-1 S
A
UL
UL
11
48,000
4
26,000
2
17,500
3
26,000
2
17,500
4
25,500
3
14,000
1
9,000
S-2 S
A
UL
UL
11
79,000
5
39,000
3
26,000
4
39,000
3
26,000
5
38,500
4
21,000
2
13,500
U S
A
UL
UL
5
35,500
4
19,000
2
8,500
3
14,000
2
8,500
4
18,000
2
9,000
1
5,500

For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
A = building area per story, S = stories above grade plane, UL = Unlimited, NP = Not permitted.
a. See the following sections for general exceptions to Table 503:
    1. Section 504.2, Allowable building height and story increase due to automatic sprinkler system installation.
    2. Section 506.2, Allowable building area increase due to street frontage.
    3. Section 506.3, Allowable building area increase due to automatic sprinkler system installation.
    4. Section 507, Unlimited area buildings.
b. See Chapter 4 for specific exceptions to the allowable height and areas in Chapter 5.


503.1 General.

The building height and area shall not exceed the limits specified in Table 503 based on the type of construction as determined by Section 602 and the occupancies as determined by Section 302 except as modified hereafter. Each portion of a building separated by one or more fire walls complying with Section 706 shall be considered to be a separate building.

503.1.1 Special industrial occupancies.
Buildings and structures designed to house special industrial processes that require large areas and unusual building heights to accommodate craneways or special machinery and equipment, including, among others, rolling mills; structural metal fabrication shops and foundries; or the production and distribution of electric, gas or steam power, shall be exempt from the building height and area limitations of Table 503.
503.1.2 Buildings on same lot.
Two or more buildings on the same lot shall be regulated as separate buildings or shall be considered as portions of one building if the building height of each building and the aggregate building area of the buildings are within the limitations of Table 503 as modified by Sections 504 and 506. The provisions of this code applicable to the aggregate building shall be applicable to each building.
503.1.3 Type I construction.
Buildings of Type I construction permitted to be of unlimited tabular building heights and areas are not subject to the special requirements that allow unlimited area buildings in Section 507 or unlimited building height in Sections 503.1.1 and 504.3 or increased building heights and areas for other types of construction.