As per the definition, building bye-laws are the rules set forth by the government authorities, city corporation and developing authorities, for example Ahmedabad Urban Development Authority (AUDA). These norms are tools that control the various aspects of building to ensure the health and safety of general public and visitors. Also, to ensure the necessary protection to the labourers before starting and during construction. This provides orderly growth of a city.
• Allows planned growth
• Prevent haphazard planning of city
• It ensures the safety from fire, noise, health hazard, etc
• It ensures the appropriate climatic design of building
• Floor Area Ratio (FAR) or Floor Space Index (FSI)
• Building frontage line
• Minimum plot size
• Built up area of building
• Height of building
As per GDCR 2021, FSI means the quotient of the ratio of the combined gross built-up area of all floors, to the total area of the Building-unit.
Floor Space Index = Total built-up area of all floors / Area of the Building-unit
As per Planning Regulation 10.5.1
For Building‐units with area 500 sq.mts or less
In case of open or partially built plot, the ground coverage shall be the entire area of the Building‐unit.
As per Planning Regulation 10.5.2
For Building‐units with area more than 500sq.mts and up to 1500 sq. mts
The permissible ground coverage shall be up to maximum 75% of the entire building‐unit area.
As per Planning Regulation 10.5.3
For Building‐units with area more than 1500sq.mts
The permissible ground coverage shall be up to maximum 65% of the entire building‐unit area.
As per table in Planning Regulation 10.6
|No.||Road Width (in meters)||Maximum permissible building height (in meters)|
|1||Up to 7.5mts||Twice the width of the abutting road or open space|
|2||Above 7.5mts and up to 12mts||15.0|
|3||12.0mts and above||25.0|
As per the Planning Regulation 13.3.1
Road side margin for residential uses are as below
|No.||Road width (in meters)||Road Side Marginfor Building-unitarea up to2000sq.mts andbuilding height upto 25m (in meters)||Road Side Marginfor Building-unitwith area above2000sq.mts andbuilding height upto 25m (in meters)||Road Side Marginfor Building-unitwith height morethan 25m(in meters)|
|1||Up to 9||3.0||3.0||–|
|2||Above 9 and up to 12||4.5||4.5||–|
|3||Above 12 and up to 18||6.0||6.0||7.5|
|4||Above 18 and up to 30||6.0||7.5||7.5|
As per the Planning Regulation 13.6.5, required side and rear margin for building-units up to 500sq.mts for Dwelling-1 & 2 are as below
|No.||Area of the building unit||Required Rear Margin||Required side margin|
|1||Up to 150 sq.mts||2.25mts||Not required|
|2||Above 150 sq.mts and up to 300 sq.mts||2.25mts||1.5mts (Any one side)|
|3||Above 300 sq.mts and up to 500 sq.mts||2.25mts||3mts (Both sides)|
As per the Planning Regulation 13.6.8, required minimum margin between buildings are as below
|No.||Building heights||Required margin (in meters)|
|1||Up to 15mts||4.5|
|2||Above 15mts and up to 25mts||6.0|
|3||Above 25mts and up to 45mts||9.0|
As per the Planning Regulation 13.6.9, the required margin from the common plot are as below,
|No.||Building height||Required margins (in meters)|
|1||Up to 25mts||3.0|
As per the Planning Regulation 13.9.1, the required minimum area of common plot re as below,
|No||Use||Area of the Building-unit||Minimum required area of common plot|
|1||Dwelling-1,2&3||2000sq.mts or more||10% of the area of building unit|
As per the Planning Regulation 13.10, the minimum parking required in dwelling-1,2 & 3 are as below,
|No.||Type of use||Minimum parking required||Visitors parking and remarks|
|1||Dwelling-1,Dwelling-2||1 car parking – for more than 80sq.mts and up to 300 sq.mts ofplinth area per unit.Additional 1 car parking for every100sq.mts additional plinth areaper unit.This shall be permitted within themarginal space||Nil|
|Dwelling-3||20% of total utilised FSI||10%, of the required parking space shall be provided as visitors parking|
As per the Planning Regulation 23.2.2,
Minimum dimension of a space provided for parking a car shall be 2.5mts x 5.5mts.
Minimum dimension of a space provided for parking a two-wheeler shall be 0.9mts x 2mts.
As per the Planning Regulation 23.1.1,
The height of a boundary wall towards the road‐side shall not exceed 1.5mts from the crown of the adjacent road and 1.8mts from the crown of the adjacent road for all other sides of the building‐unit.
As per the Planning Regulation 23.1.6,
The plinth of the habitable area of any building shall be at a minimum height of 0.45mts from the established level of the building-unit.
As per the Planning Regulation 23.1.8,
The minimum clearance height for Dwelling Units or Commercial Buildings:
a. All habitable spaces shall have minimum height of 2.9mts between finished floor levels.
b. All circulation and service spaces such as veranda, bathroom, washroom, toilet, passage, puja room, store room and stair cabin shall have a minimum clearance height of 2.1mts.
As per the Planning Regulation 23.1.9,
Mezzanine floor shall have a minimum clear height of 2.1mts which may be allowed in a room at a minimum clear height of 2.1mts from the floor level if the area does not exceed 30% of the area of the enclosed space.
As per the Planning Regulation 23.1.12,
A parapet/ railing with a minimum height of 1.15mts from the finished floor level shall be provided to ensure safety at all accessible edges of a building such as roof edges, staircase, balcony, floor edges or any large openings and/or fully glazed window.
As per the table of Planning Regulation 23.1.14,
|No||Use||Height of building (mts)||Staircase|
|Min. Flight width (mts)||Min. Tread (mm)||Max. Riser (mm)|
|1||Dwelling-1&2||Three floors uo to 12m||1.0||250||200|
|2||Dwelling-3||Up to 15m||1.2||250||180|
|3||Dwelling-3||More than 15 up to 25m||1.5||250||180|
|4||Dwelling-3||More than 25m||2.0||300||160|
As per the Planning Regulation 23.12
|No||Building use||Height of building||Minimum no. of lifts (Whichever is more from column A and B)|
|1||Dwelling||Above 15mts||Minimum 1, or||1 Lift per Thirty dwelling units(excluding dwelling units on groundlevel and two upper floors or Hollow plinthand two upper floors)|
|Above 25mts||Minimum 2, or|
As per the Planning Regulation 24.4, the required width of corridor as per the length of corridor are as below,
|Length of corridor (in mts.)||Width of corridor (in mts.) for residential|
|Up to 6||1.0|
|Up to 9||1.2|
|Up to 15||1.2|
|Above 15 and up to 24||1.5|
|24 and above||2.0|