Highrise Services Calculation 1

First of all, these are the general information that you have to have.

1. Plot ratio of the site
2. Allowable plinth area of the site
3. Open space of the site
4. Total site area
5. Proposed quantity of floor (does not include the number of basement/s)

Example,
Total site area = 8371.76m²
Allowable plinth area = 60%
Open space = 40%
Plot Ratio = 1:7
Quantity of Floor = 34 storeys

1. Gross Floor Area (GFA)

= Site Area x Plot Ratio
Example,
8371.76m² x 7
= 58602.32m²

2. Plinth Area

= Allowable plinth area x site area
Example,
60% x 8371.76m²
= 5023.06m²

3. Size per floor

GFA / Quantity of floor
Example,
58602.32m² / 34
= 1723.60m² (does not determine the size of basement/s)

* The size per floor usually be determined first based on the space requirements set out by the client.

4. Net Lettable Area (NLA)

GFA - 30%GFA or 70% of GFA
(30% of GFA is the area reserved for services)
Example,
58602.32m² - 30%(58602.32m²)
= 58602.32m² - 17580.70m²
= 41021.62m²

5. Maximum number of occupants

= NLA / area per person
(Let say 10m² per person, please refer Neufert for this)
Example,
41021.62m² / 10m²
= 4102 person

* Number of occupants usually be determined based on the building program and the space planning.

6. Maximum number of occupants per floor

= Maximum number of occupants / Quantity of floor
Example,
4102 / 34
= 410 occupants per floor

7.Number of Car parking space

NLA / Specified number by the local authority
(125 is the number specified by the local authority, in this case it is the number provided by the Johor City Council in the Local Development Plan)
Example,
41021.62m² / 125
= 328 parking

8. Number of Motorcycle parking space

30% x Car parking space
Example,
30% x 328
= 98 parking

*Note that this calculation is just a general guideline, it DOES NOT have to be precisely followed.