Gross floor area equals the plot ratio multiplied by the site area
A worked RES examination question on plot ratio gfa, from our Paper 1 bank — with the rule it turns on, and why each of the four options is right or wrong.
The question
A developer holds a plot with a Master Plan plot ratio of 2.5 over a site of 2,000 square metres, and wants to know the gross floor area he may build on it. He recalls that the plot ratio and the site area give the gross floor area when the two are multiplied together, but he wants his consultant to confirm the figure before he plans the scheme, and to make sure he has not mistaken the method for one of dividing or adding.
Which figure is correct?
The answer, and why
Answer: A
The rule. Gross floor area equals the plot ratio multiplied by the site area.
Why A is correct. 2.5 × 2,000 = 5,000 square metres.
The other options.
- B divides.
- C adds.
- D rounds the plot ratio down before multiplying, which the rule does not do.
Exam note. Multiply, do not round or add. The plot ratio is used as it stands.
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Independent study material. Not affiliated with or endorsed by the Council for Estate Agencies. No pass guarantee — for study use only.