Tamilnadu municipality byelaws
and building rules (1972)
b. For the construction,
reconstruction, addition or alteration of a building the permission will not be
granted if the clearance between the building and the aerial lines is less
1.5m for low tension and 1.75 m for high tension lines measured horizontally incase of accessible portions of the buildings
1.25m for low and high tension lines measured horizontally incase of inaccessible portions of the buildings.
2.5m for portions of the buildings not accessible to the portions measured
2. Space of buildings
street at anyplace
is less than
3.75m in width,
the building should not be
within 2m from the center point of the street.
structure than the steps, fence is permitted in the space between the building
and edge of the street.
and window shutters
should not open
Outward Street where the
more width and the buildings is built along with edge of the street.
3. Dimensions of rooms
of an average is not less than 2.75 m and 2.1m at any point measured from top
surface of the floor to the underside of the roof.
superficial area is not less than 7.5m2
is not less than 2.5m
area is 1.8m2 (1.52 x 1.2m)
closet or toilet shall be 1 m2 (1.2 x 0.9m)
cum water closet shall be 2.7m2 (1.82 x 1.52m)
4. Ventilation of buildings
room intended or used for human habitation (human activites) should have
windows and ventilators
of ventilation should not be less than 1/8 floor area or carpet area
domestic building constructed for human habitation should have at least one
side abutting for a length of not less than 2.5m on an open space either
internal/external. Such open space shall not be less than 1.75m in width.
open space either internal or external should open to sky no construction is
allowed in the open space area.
and toilets the area of windows or ventilator should not be less than
1 sqm =
0.5 sqm =
5.38 sq.ft [3' x 2' = 6 sq.ft]
5. Minimum width
doorways, windows or passage should have a minimum width of 1m. The door of kitchen,
bath and toilet should not be less than 0.6m clear width.
flush and sanitary appliances or convenience are to be provided properly in the
a. Width of the stair
width of the stair excluding hand rail shall not be less 500 mm.
b. Head room [Height from floor
headroom should be at least 2.1m measured perpendicular from the nosing
(projection on step)
c. Tread and Riser
shall not be more than 175mm and the tread shall not be less than
the sum of two risers and the tread shall not be less than 600mm and not more
than 625mm. in one flight should be not be any variation in rise / tread. No
stairs should be permitted to cut across a window.
between the landings shall not be more than 3.75 m
handrails shall be placed at the height not less than 750mm and not than 1000mm
above the projection of step.
passage giving access to the staircase width shall not be less than the stair
width. In the passage gives access to more than 1 stair its minimum width shall
be equal to the width of the stair +1.5 of total width of the remaining stair
width should not be less than stair width. If the passage gives access to the
more one stair. Its minimum width shall be equal to width of the stair. The
State and Central government building are exempted from these rules.