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National Building Regulations
Part A. Administration

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A21. Population

The population of any room or storey or portion thereof shall be taken as the actual population of such room, storey or portion thereof where such population is known or, where such population is not known, the population shall be calculated from the criteria given in Table 2.
In the case of any occupancy classified as F1, where the total floor area is more than 500 m², that portion of the floor area that is in excess of 500 m² shall, for the purposes of calculation of the population be reduced by an amount of 20%.

Table 2 - Design Population

Class of occupancy of room or storey or portion thereof	Population
A1, A2, A4, A5	Number of fixed seats or 1 person per m² if there are no fixed seats.
E1, E3, H1, H3, H4	2 persons per bedroom
E4	16 persons provided that the total number of persons per room is not more than 4
H5	16 persons per dwelling unit provided that the total number of persons per room is not more than 4
G1	1 person per 15 m²
J1, J2, J3, J4	1 person per 50 m²
C1, E2, F1, F2	1 person per 10 m²
B1, B2, B3, D1, D2, D3	1 person per 15 m²
C2, F3	1 person per 20 m²
A3, H2	1 person per 5 m²