HOW TO MEASURE PLINTH AND CARPET AREA OF BUILDINGS AS PER IS CODE IS 3861 : 2002

 MEASUREMENT OF PLINTH AND CARPET AREA AS PER IS: 3561 (2002)

GENERAL

The areas of each of the following categories shall be measured separately and shall not be clubbed together:

a) Basement

b) Floor without cladding ( stilted floor)

c) Floors including top floor which may be partly covered

d) Mezzanine floor including addl. floor for seating in assembly building/ theatre, auditorium, etc

e) Garage

f) Accommodation for service staff

g) Stair cover ( mumty )

h) Machine room;

g) Porch and

h) Towers, turrets, domes projecting above the terrace level at terrace.

MEASUREMENT OF PLINTH AREA

Plinth area shall mean the built-up covered measured at the floor level of the basement or of any storey. For the purpose of plinth area, following shall be included:

a) Area of the wall at the floor level excluding plinth offsets, if any; when the building consists of columns projecting beyond cladding, the plinth area shall be taken up to the external face of cladding ( in case of corrugated sheet cladding outer edge of corrugation shall be considered )

NOTE — In case. a common wall is owned jointly by two owners, only half the area of such walls shall be included in the plinth area of one owner.

b) Shafts for sanitary, water supply installations, garbage chute, telecommunication, electrical, fire fighting, air-conditioning and lifts

c) Stair case

d) In case of open verandah with parapets:

1. 100percent areas for the portion protected by the projections above, and
2.  50 percent area for the portion unprotected from above.

e) 100 percent area of the balcony protected by projection above and 50 percent area of the unprotected balcony; and

f) In case of alcove made by cantilevering a slab beyond external wall:

1. 25 percent of the area for the alcove of height up to 1 m,
2. 50 percent of the area for the alcove of height more than 1m and upto 2 m, and
3. 100 percent of the area for the alcove of height more than 2 m.

The following shall not be included in the plinth area 

a) Area of loft
b) Area of architectural band, cornice, etc
c) Area of vertical sun breaker or box louver projecting out and other architectural features, for example slab projection for flower pot, etc;
d) Open platform;
e) Terrace;
f)) Open spiral/service stair cases; and
g) Area of mumty, machine room, towers, turrets, domes projecting above terrace level.

MEASUREMENT OF CARPET AREA

Carpet area shall mean the floor area of the usable rooms at any floor level

(A) From the plinth area as worked out above, the area of the wall shall be deducted ( see below). Thickness of wall shall be inclusive of finishes.
(NOTE — The various dimensions could be measured internally or externally.)

The following shall be included in the wall area:

a)Door and other openings in the wall;
b) Pillars, intermediate pillars, supports or any other such obstruction within the plinth area irrespective of their location;
c) Plaster along wall exceeding 300 cm2 in area;
d) Flues which are within the wall;
e) Built-in cupboard, almirah and shelf appearing within a height of 2.2 m from floor; and
f) Fire place projecting beyond the face of the wall in living or bed room.

The following shall be excluded from the wall area:

a) Plaster along wall not exceeding 300 cm2 in area, and
b) Chullah platform projecting beyond the face of the wall.

 (B) The carpet area shall be the area worked out as in (A) excluding the area of the following portion:

a) Verandah;
b) Corridor and passage;
c) Entrance hall and porch;
d) Staircase and stair-cover ( mumty ) ( see Note);
e) Shaft and machine room for lift;
f) Bathroom and lavatory;
g) Kitchen and pantry;
h) Store;
j) Canteen;
k) Air-conditioning duct and plant room; and
m) Shaft for sanitary/water supply installations and garbage chute, electrical and fire fighting, air-conditioning, telecommunication, lift.

NOTE — In a hall or basement, areas of portion I m beyond last step shall be part of the staircase.

The carpet areas of category mentioned in General (above) -  b), e), g), h), k) and m) are not required to be calculated.

MEASUREMENT OF RENTABLE AREA

Rentable area shall mean the carpet area at any floor level including areas mentioned below

Residential Buildings

 The rentable area shall be carpet area as worked out in 5 but shall further include the following:

a) The carpet area of kitchen, pantry, store, lavatory, bath room; and

b) Fifty percent of carpet area of unglazed and 100 percent of glazed verandah.

 It shall, however, exclude the carpet area of the covered portion of the building  such as storage space on top landings of staircase, under first landing and waist slab on floor one.

Non-Residential Buildings

The rentable area shall be carpet area increased by the carpet area of the canteen including store, kitchen and pantry attached to it.

It shall, however, not include carpet areas of bathroom and lavatory.

Balcony

A horizontal projection with a hand-rail, balustrade or a parapet, to serve as passage or sitting out place.

Mezzanine Floor

An intermediate floor in between two main floors having minimum height of 2.2 m from the floor and having a proper and permanent access to it.

NOTE — Where rules of the local bodies permit intermediate floor of minimum 1.8 m clear height, these be also considered as mezzanine floor for the purpose of measurement.

Stair Cover ( Mumty )

Itis a structure with a roof over a staircase and its landing, built to enclose only the stairs for the purpose of providing protection from weather and not used for human habitation.

 Loft

A structure providing intermediate storage space in between two main floors without having a permanent access and at a height not less than 2.0 m from the floor below.

Porch

It is a covered structure supported on pillars or otherwise for the purpose of pedestrian or vehicular approach to a building.