Building Bye Laws, Standard Dimensions Of Building & Tips For Civil Engineer -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

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Apr 19, 2021

Building Bye Laws, Standard Dimensions Of Building & Tips For Civil Engineer

 What is Building Bye-Law?

The building Bye-Laws are the restrictions set by the municipal authorities, urban development and other government departments of the urban planning trusts related to the free space to be left around the building, the allowed construction area, etc.

Therefore, the proposed building plan must be prepared. according to the legal ordinance that is verified and approved by the mentioned authorities. It determines the standard size of building components.

Building Bye Laws

Minimum Depth Of The Foundation

To get rid of weather effects and for better stability, the minimum depth of the foundation should be kept 1 m below ground level. The width of the foundation should be such that the soil pressure is within its safe bearing capacity.


Minimum dimension for plinth beam foundation

its height can range from 300mm to 600mm, but 450mm is the most common. For waterproof and important buildings, the minimum foundation height is 600 mm. With a height of more feet, the building acquires a majestic appearance.


Built-Up Area

The built-up area should be at least 1.2 times the floor area of ​​the building. The minimum width of the foot is 100 m higher than the one above and the minimum vertical depth is 4” (100 mm) for the standard brick depth. When multiple footers are provided their depth will be kept equal.

The width of the cement concrete bed of the foundation = the width of the brick foot + 4”+ 4” immediately above the concrete bed. (I.e. 4” (100) mm is the minimum offset for a concrete bed).


Minimum width of footing = 2w + 2o


w = wall thickness immediately below the base level (not less than 200 mm)

o = concrete offset (not less than 100 mm)


Thickness Damp Proof Courses

damp proof courses thickness should be 20 mm to 25 mm.


Thickness Of The Cement Concrete

The thickness of the cement concrete base should be at least 100 mm. Floor finish results are usually with cement mortar or tiles with a thickness of 10 mm to 20 mm.

Ceiling Height

·       The main rooms (i.e., bedroom) ceiling height of the residential building should be 3000 mm to 3600 mm.

·       Bath and W.C. Ceiling height can range from 2000 mm to 2750 mm. (Maximum height of the building depends on the type of structure)

Area of the carpet

The area of the carpet should be 50 to 65% of the area of the floor.


The standard size of door

The main entrance door of a residential building should be 1000 mm x 2100 mm in size. The minimum width of other doors should be 900 mm and 2000 mm high. The doors to the garage are 2500mm x 2300mm and W.C. And bathrooms with single-leaf shutters ranging from 600mm to 750mm x 1800mm.


How to calculate Size Of Windows

The size of the windows depends on the total area of ​​the required window openings.

Guidelines Should Be Kept In Mind:

·       Window width = 1/8 (room width + room height).

·       Glass area in windows should be 10% to 20% of the floor area of ​​the room (for good lighting).

·       At least one sq. m. A window area should be provided for every 30 cubic meters of living room space.

·       Generally, the minimum size of the window is 750 mm x 1000 mm



Minimum Room Dimensions for Residential Building.




To read click: How to Calculate Number of Riser and Treads of staircase?

The thickness of the RCC lintel

The thickness of the RCC lintel beam 4” to 9” and 6” are the most common.

ALSO READ:  How To Calculate Steel Quantity Of Lintel Beam - Bar Bending Schedule


The thickness of the R.C.C. roof slab

4” to 6” (6” is more common) and that of sunshades is 2” to 3”.


Sunshade Projection Length

Sunscreen projecting 450 mm or 500 mm beyond the face of the exterior wall.


Width of verandah

It ranges from 1.8 m to 3 m and the width of the passage is 0.8m to 1.2 m in residential houses.


Height of parapet wall

It should not be less than 0.60 m and not more than 1.2 m above the finished ground level.



To read click: Height of various building components and Standard height of a building:

MUST-READ: Unit Conversion | Measurement Units | Site Engineer Must Read

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