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How to Calculate Floor Area Ratio [FAR] for your building project as per RAJUK rules

Updated: Jan 16





When someone decides to build a building in Dhaka City, Two obvious questions come to mind first.

  1. What will be each floor area?

  2. How many floors can be built?



So How to get the fast and accurate answer to these questions?

Easy! Check the neighbouring buildings. Oh.No! There are so many variations for the same size of land.


Now What to do? There is only one way to find the answer to these questions. Dhaka Imarat Nirman Bidhimala 2008.


So Let start to calculate as per Dhaka Imarat Nirman Bidhimala 2008.



01. To calculate we have to know the following basic information about our land.

  1. Land Area

  2. Access road width

Basically, this two information determine what will be the floor size and how many floors can be built.



02. We need to have some basic information about these two factors.

  1. Without exception, The width of any access road to a plot must be a minimum of 20 feet or 6 meters. So if your plot access road width is less than 20 feet, You have to surrender 50% amount of land area out of the total required land area to make the road width 20 feet. See the following fig to get an idea.

2. For surrendering land area for road or having a road width more than 20 feet bring some bonus area for your building.




03. Determine FAR for your land


You can determine FAR for your land from the following chart. keep in mind that to acquire a specific FAR you have to match both land area and access road width from this chart. In case it doesn't then the lower value of these two factors will determine the FAR.


Let see an example, Say You have a 15 Katha land with a 6 meter or 20 feet access road width, As per 15 Katha land you should get FAR from 12 No Slab. But you will get FAR from 9 No Slab. So Access road width plays a vital role determine the FAR. [ see the following chart fig 5.1 to find the slab FAR ]


Sometimes some additional bonus FAR can be acquired if you have surrender land area for road widening or already have wide road more than 6 meters or 20 feet. But this bonus FAR can't be more than the next slab of your basic FAR.

Say you have a land of 5 Katha with a 9-meter access road you will get FAR 3.50. And you will get some bouns FAR for having roading with more than 6 meters or 20 feet. But Total of the FAR ( Basic FAR + Bonus FAR ) can't be more than the next FAR 3.75.

Fig: 51 Table 3 (ka), Page 3035 from the Dhaka Imarat Nirman Bidhimala 2008.


04. Build Area


So if you can nearly determine FAR for your land, now you have to calculate the Build Area

Build Area = your land area x FAR

That's it. you successfully completed the mission!


Here Build Area means FAR included construction area.


What is included here?

1. Usable Floor Area

2. Lift-lobby and stair Area

3. Any common space


What is Excluded here?

1. Ground Floor Parking Area

2. Rooftop area

3. Front Verandah area

4. other Verandah area


05. Now you will get the answers to your earlier Questions.


  1. What will be each floor area?

Answer: Build area divided by floor number


2. How many floors can be built?


Answer: Build area divided by floor area.


Please note that the floor area can't be more than Maximum Gound Coverage [MGC] which is given on the FAR CHART. For specific FAR have specific MGC.

Unless more than 150-meter tall building RAJUK usually doesn't decide the building height limit. it is determined by other agency like Civil aviation, Fire department, Traffic etc.


06. Example


Say you have a land of 5 Katha with the 9-meter width access road.

What is Basic FAR for your land? The answer is 3.50. You got some bouns FAR for Extra land. [ i intentionally skip this calculation part to make things simple] than you total FAR can't be 3.75.


Build Area = your land area x FAR

So Build Area will be [3.75] x [3600sft] = [13500 sft]


Floor area = [ not more than MGC which is 62.50%] = Maximum 2250 sft


So

if you want to keep 2250sft each floor, you will get 13500/2250=6.00 no Floors without ground floor & verandah area

if you want to keep 2000sft each floor, you will get 13500/2000=6.75 no Floors without ground floor & verandah area

if you want to keep 1800sft each floor, you will get 13500/1800=7.50 no Floors without ground floor & verandah area

if you want to keep 1600sft each floor, you will get 13500/1600=8.43 no Floors without ground floor & verandah area

if you want to keep 1500sft each floor, you will get 13500/1500=9.00 no Floors without ground floor & verandah area



07. Note


Please note that the above-mentioned procedure can help you to get an initial conceptual answer to the earlier questions only. But for detail and actual calculation please consult with a professional architect or engineer.

Best of luck for your project.





You can download the document for from the below.

1. Dhaka Imarat Nirman Bidhimala 2008.

Dhaka_Imarat_Nirman_Bidhimala_RAJUK
.pdf
Download PDF • 21.74MB


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