Clause 2.2 Size of SS

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2.2.1 Area and Volume

a. The minimum internal floor area and minimum internal volume of a SS or S/C SS shall be based on gross floor area (GFA) of dwelling unit and nominal occupancy of dwelling unit in accordance with TABLE 2.2.1.

b. The maximum internal floor area of a SS or S/C SS shall be 32m².

c. For the S/C SS, the aggregate planar area of the staircase entrance landing, intermediate landing and the staircase treads (excluding the over-lapping tread at each riser and area taken up by the internal SS door) of each storey is taken as its internal floor area.

d. The product of the internal floor area of the S/C SS and its clear height, measured from the finished floor level (FFL) to the soffit of the ceiling staircase slab, is taken as the internal volume of the S/C SS.

e. The maximum internal length of any floor and roof slab of a SS shall be 10000mm. The minimum internal width of a SS or S/C SS shall be 1200mm. Refer to FIGURE 2.2.1(a) and 2.2.1(b).

f. For S/C SS, the minimum internal width of staircase flight shall be at least 1150mm. See FIGURE 2.12.1(f).

g. The ratio of the internal length to the internal width shall not exceed 3:1.

2.2.2 Heights

a. The minimum SS clear height shall be 2400mm. Refer to FIGURE 2.2.1(a). The minimum NS clear height shall be 2400mm

b. The minimum S/C SS or scissor S/C SS clear height shall be 2400mm. Within the S/C SS or scissor S/C SS tower, where the storey height deviated from the typical storey height, the minimum clear height of NS in S/C SS or scissor S/C tower shall be 2000mm. Refer to FIGURE 2.2.2(a).

c. The maximum clear height of a SS, S/C SS, scissor S/C SS and NS shall be 3900mm. Refer to FIGURE 2.2.1(a), 2.2.2(a) and TABLE 2.3.1.

TABLE 2.2.1 : MINIMUM INTERNAL SS FLOOR AREA AND VOLUME
*Gross Floor Area (GFA) of Dwelling Unit**	Nominal Occupancy of Dwelling Unit (No. of persons catered for in SS)
GFA ≤ 45m²	2
45² < GFA ≤ 75m²	3
75m² < GFA ≤ 140m²	4
GFA > 140m²	5
Note: The GFA of the dwelling unit excludes the area of balconies that are open on at least two sides to make the balconies conducive for sky-rise gardening in accordance with URA guidelines. Area of Storey Shelter = TNO x 0.6m² Volume of Storey Shelter = TNO x 1.8m³ TNO = Total Number Occupancy of units served by Storey Shelter

TABLE 2.3.1 : REQUIRED MINIMUM SS AND NS WALL THICKNESS
Storey Height (SH) (mm)	SS/NS Clear Height (Ht) (mm)	Setback Distance of SS Wall (mm)	Wall Thickness (mm)
SH ≤ 4000	2400 ≤ Ht ≤ 3400	≤ 6000	300
	2400 ≤ Ht ≤ 3400	> 6000	250
	3400 < Ht ≤ 3900	≤ 6000	325
	3400 < Ht ≤ 3900	> 6000	275
4000 < SH ≤ 6000	2400 ≤ Ht ≤ 3400	≤ 7000	300
	2400 ≤ Ht ≤ 3400	> 7000	250
	3400 < Ht ≤ 3900	≤ 7000	325
	3400 < Ht ≤ 3900	> 7000	275
6000 < SH ≤ 8000	2400 ≤ Ht ≤ 3400	≤ 8000	300
	2400 ≤ Ht ≤ 3400	> 8000	250
	3400 < Ht ≤ 3900	≤ 8000	325
	3400 < Ht ≤ 3900	> 8000	275
8000 < SH ≤ 10000	2400 ≤ Ht ≤ 3400	≤ 9000	300
	2400 ≤ Ht ≤ 3400	> 9000	250
	3400 < Ht ≤ 3900	≤ 9000	325
	3400 < Ht ≤ 3900	> 9000	275

TABLE 2.2.1: MINIMUM INTERNAL SS FLOOR AREA AND VOLUME

FIGURE 2.2.1(a): TYPICAL LAYOUT OF SS

FIGURE 2.2.1(b): TYPICAL LAYOUT OF S/C SS

FIGURE 2.12.1(f): TYPICAL PLAN OF S/C SS COMPARTMENT

FIGURE 2.2.2(a): SECTION OF S/C SS TOWER SHOWING S/C SS AND NS CLEAR HEIGHT

FIGURE 2.2.1(a): TYPICAL LAYOUT OF SS

FIGURE 2.2.1(b): TYPICAL LAYOUT OF S/C SS

TABLE 2.3.1 : REQUIRED MINIMUM SS AND NS WALL THICKNESS

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TABLE 2.2.1: MINIMUM INTERNAL SS FLOOR AREA AND VOLUME

FIGURE 2.2.1(a): TYPICAL LAYOUT OF SS

FIGURE 2.2.1(b): TYPICAL LAYOUT OF S/C SS

FIGURE 2.12.1(f): TYPICAL PLAN OF S/C SS COMPARTMENT

FIGURE 2.2.2(a): SECTION OF S/C SS TOWER SHOWING S/C SS AND NS CLEAR HEIGHT

FIGURE 2.2.1(a): TYPICAL LAYOUT OF SS

FIGURE 2.2.1(b): TYPICAL LAYOUT OF S/C SS

TABLE 2.3.1 : REQUIRED MINIMUM SS AND NS WALL THICKNESS