Building Bye-Laws are the restriction laid down by municipal, urban development authorities, and other government departments a town planning trusts related to clear space to be left around the building, permissible construction area, etc.
Hence the proposed plan of the building is to be prepared according to the bye-law which are checked and approved by the above authorities.
This decides the Building Dimensions Standard in residential buildings.
Building Dimensions Standard
Following are the Standard Dimensions of Building and Building Size,
1. In order to be free from weathering effects and for better stability, the minimum depth of the foundation is kept 1m below the ground level.
For water logging prone and important buildings, the minimum plinth height is 600 mm. With greater plinth height, the building gets a majestic appearance.
3. Plinth Area should be a minimum of 1.2 times the floor area of the building. The minimum width of the footing is 100 m more than the one above and the minimum depth of footing is the depth of the standard brick 100 mm.
4. When a number of footings are to be provided preferably their depths are kept equal.
The width of the cement concrete bed of foundation = width of the brick footing immediately above the concrete bed + 100 mm + 100 mm. (i.e. 100 mm is the minimum offset for the concrete bed).
5. Minimum width of footing = 2t + 2j
Where, t = Thickness of wall immediately above basement level (Not less than 200 mm )
j = offset of concrete (Not less than 100 mm)
7. Thickness of the cement concrete floor is a minimum of 100 mm plus floor finish over it. Floor finishes are generally 10 mm to 20 mm thick cement mortar or tiles.
8. Ceiling height (i.e., headroom) for main rooms of the residential building should be 3000 mm to 3600 mm.
For bath and W.C. the ceiling height may be 2000 mm to 2750 mm. (maximum height of the building depends upon the types of structure)
9. The carpet area should be 50 to 65% of the floor area.
10. Main entrance door of a residential building should be 1000 mm x 2100 mm in size. Other doors should have a minimum width of 900 mm and a height of 2000 mm.
Doors for the garage are 2500 mm x 2300 mm and for W.C. and bathrooms are 600 mm to 750 mm x 1800 mm with the single–leaf shutter.
11. The size of windows depends on the total area of window openings required.
The following guidelines should be kept in mind,
(i) Window width = 1/8 (width of room + height of room).
(ii) Glass area in windows should be 10% to 20% of the floor area of the room for good lighting.
(ii) At least one sq.m. of window area should be provided for every 30 cubic meters of inside room space.
Generally, the minimum size of the window is 750 mm x 1000 mm
12. The minimum size of the ventilator is 1000 mm x 500 mm in order to provide good ventilation for any habitable room.
For bath and W.C. it should be a minimum of 450 mm x 300 mm. Its depth is greater than 450 mm or otherwise privacy is lost.
13. Minimum Room Dimensions for Residential Building.
|Name of Room||Minimum Dimension||Maximum Dimension|
|1.||Drawing Room or Living Room||4200 mm x 4800 mm||5800 mm x 7200 mm|
|2.||Bed Room or Master Bed Room ||3000 mm x 3600 mm||4200 mm x 4800 mm|
|3.||Dining Room||3600 mm x 4200 mm||4200 mm to 4800 mm|
|4.||Kitchen||2500 mm x 3900 mm||3000 mm x 3000 mm|
|5.||Bath / WC Combined||1800 mm x 1800 mm||1800 mm x 2500 mm|
|6.||Bath (Separated)||1200 mm x 1800 mm||–|
|7.||W. C. (Separated)||1200 mm x 1200 mm||–|
|8.||Guest Room||3000 mm x 3600 mm||3000 mm x 3000 mm|
14. Standard Stairs Size
- Rise in residential building = 130 mm to 190 mm.
- Rise in office building = 125 mm to 150 mm.
- Going – 275 mm to 350 mm for public buildings.
- Going 250 mm to 300 mm for residential buildings.
- For selecting the rise and tread of a building, the following thumb rules are followed,
- 2T X R = 550 to 650
- T x R = 39000 to 48000
- The width of the steps is 900 mm for residential buildings and 1000 mm for public buildings.
- Number of Riser = (Total Height of floor / Height of riser)
- Number of treads = Number of riser – 1
15. Thickness of R.C.C. I lintel beam of 100 mm to 250 mm and 150 mm is more common.
16. Thickness of R.C.C. roof slab is 100 mm to 150 mm (100 mm is more common) and that of sunshades is 25 mm to 50 mm.
17. Sunshade projection length in cm: sunshade projection through 450 mm or 500 mm beyond the facing of an external wall.
18. Width of the verandah is from 1.8 m to 3 m and the width of the passage is 0.8m to 1.2 m in residential houses.
19. The height of the parapet wall should not be less than 0.60 m and not more than 1.2 m above the finished floor level.
20. Height of various building components and Standard height of a building
|1||Plinth Level||450 to 600 from GL|
|2||Window Sill Level||900 from floor level|
|3||Lintel Level||2100 from floor level|
|4||Roof Slab Level||3000 to 3600 from floor level|
|5||Parapet Wall||600 to 900|
|6||Courtyard or Garage||1500 from GL|
|7||Foundation for Single Story||1000 below GL|
|8||Foundation for Double Story||1000 to 1200 below GL|
|9||Railing Height||850 from thread|
|10||Rise of Step||150 to 190|
21. Standard Size of Sunshade:
The primary purpose of providing Sunshade is for controlling the amount of direct sunlight through your building’s window.
Where to shed?
Eastern, Southern, and western exposure of your building will derive benefits from solar shading and the southern exposure is best for sun shed and provides the greatest energy savings. Occupants, however, will appreciate any reduction in the morning glare of the sun (Eastern Exposure) and afternoon glare of the sun (Western exposure).
Northern exposure does not require shading of solar, the only reason for shading a northern exposure is for creating uniformity in the building appearance. Otherwise virtually no energy benefit can be gained from shading the northern side of the building. The standard size of sunshades for roof slabs is 25mm to 50mm.
Watch Video: Building Bye-Laws and Standard Size of Building Components
What do you mean by building bylaws?
Building Bye-Laws are the restriction laid down by municipal, urban development authorities, and other government departments taking into account the requirement of building and simultaneously ensuring safety.
Why are bye-laws important?
Bye-laws are the restrictions which are for ensuring the proper building of a structure taking into consideration the safety and avoiding any further damage that might cause to the building.
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