Details for Built up area, Plinth area, Carpet area & Rental area in Building construction .

Ramesh Chandra Blog for Calculation of Built up area, Plinth area, Carpet area & Rental area in Building constructions :-  

( A ) Buit up Area from above Drawing :-

1. Living Area= 10.75’ *16.67’=179.20 sq ft

2. Bed Room= 11.5’*12.0 ‘ =138.0 sq ft

3. Kitchen area =11.75’ *8.58’ =100.82 sq ft

4. Toilet Area = 7.17’*5.5’ = 39.44 sq ft

5. Staircase =    8’*3.5 ‘  = 28.0 sq ft

----------------------------------------------------------Total Built up Area-------= 485.46 sq ft

( B ) Carpet Area for above Drawing :-

1. Living Area= 10.75’ *16.67’=179.20 sq ft

2. Bed Room= 11.5’*12.0 ‘ =138.0 sq ft

3. Kitchen area =Not to be add.

4. Toilet Area = Not to be add.

5. Staircase =    Not to be add.

----------------------------------------------------------

   Carpet Area ---------------------317.20 sq ft

From the above (A ) - ( B ) = 168.26 sq ft

Hence carpet area is 168.26 sq ft less then built up area or 168.26/485.46* 100=34.65 % less then built up area .

 Note:- Carpet area vary from 65 %to 70  % of built up area.

TERMINOLOGY FOR AREA CALCULATIONS :-

1. Plinth Area-  shall mean the built-up covered area measured at the floor level of the basement or of any storey of the building.

2. Carpet Area- shall mean the floor area of the usable rooms at any floor level means (Built up area – Service area = Carpet area.)

 (Service Area= Toilets area+ kitchen area + balcony area +shaft area.)

3. Balcony Area - A horizontal projection from Rooms, Kitchen with a hand-rail, balustrade or a parapet, to serve as passage or sitting out place in a house or flat .

 4. Mezzanine Floor Area- 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.

5 Stair Cover ( Mumty ) –It is 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.

6. Loft - A structure providing intermediate storage space in between two main floors without having a permanent access and at a height not less then 2.0 m from the floor below of plinth of Building.

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

It shall be measured to nearest 0.01 m, and areas shall be worked out to the nearest 0.01 m2.

3.2 The areas of each of the following categories shall be measured separately and shall not be clubbed together: Basement; Floor without cladding ( stilted floor); Floors including top floor which may be partly covered; Mezzanine floor including additional floor for seating in assembly building/theatre, auditorium, etc; Garage; Accommodation for service shaft Stair cover (mumty ); Machine room; Porch; and Towers, turrets, domes projecting above the terrace level at terrace.

IN GENERAL -

1. Linear measurements shall be measured to nearest 0.01 m, and areas shall be worked out to the nearest 0.01 m 2.

2. The areas of each of the following categories shall be measured separately and shall not be clubbed together.-

 Basement; Floor without cladding ( stilted floor); Floors including top floor which may be partly covered; Mezzanine floor including additional floor for seating in assembly building/theatre, auditorium, etc; Garage; Accommodation for service shaft Stair cover ( mumty ); Machine room; Porch; and Towers, turrets, domes projecting above the terrace level at terrace.

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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. Shafts for sanitary, water supply installations, garbage chute, telecommunication, electrical, fire fighting, air-conditioning and lifts; Stair case; In case of open verandah with parapets: 1) 100 percent areas for the portion protected by the projections above, and 2) 50 percent area for the portion unprotected from above. 100 percent area of the balcony protected by projection above and 50 percent area of the unprotected balcony; and In case of alcove made by cantilevering a slab beyond external wall:  25 percent of the area for the alcove of height up to 1 m, 50 percent of the area for the alcove of height more than 1.0 m and up to 2 m, and 100 percent of the area for the alcove of height more than 2 m.

.2 The following shall not be included in the plinth area ( see 2.1 ): 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; O Open spiral/service stair cases; and g) Area of mumty, machine room, towers,turrets, domes projecting above terrace level.

 5.1 The following shall be included in the wall area:  Door and other openings in the wall; Pillars, intermediate pillars, supports or any other such obstruction within the plinth area irrespective of their location; Pilaster along wall exceeding 300 cm2 in area; Flues which are within the wall; Built-in cupboard, almerah and shelf appearing within a height of 2.2 m from floor; and Fire place projecting beyond the face of the wall in living or bed room. 5..2 The following shall be excluded from the wall area: a) Pilaster along wall not exceeding 300 cm2 in area, and b) Chullah platform projecting beyond the face of the wall. 5.2 The carpet area shall be the area worked out as in 5.1 excluding the area of the following portion:  Varandha; Corridor and passage; Entrance hall and porch; Staircase and stair-cover ( mumty ) ( see Note); Shaft and machine room for lift; Bathroom and lavatory; Kitchen and pantry; Store; Canteen; Air-conditioning duct and plant room; and 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. 5.2.1 The carpet areas of category mentioned in 3. are not required to be calculated.

6. MEASUREMENT OF RENTABLE AREA-  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.

6.1- It shall, however, exclude the carpet area of the covered portion of the building specified in 5. such as storage space on top landings of staircase, under first landing and waist slab on floor one.

6.2 While accounting the rentable area for category mentioned in 3., one-fourth carpet area shall be accounted for. 6.2 Non-Residential Buildings The rentable area shall be carpet area as worked out in 5 increased by the carpet area of the canteen including store, kitchen and pantry attached to it. 6.2.1 It shall, however, not include carpet areas of bathroom and lavatory.

6.2.2 While accounting the rentable area for the category mentioned in 3 one-fourth carpet area shall be accounted for.

Er.  Ramesh Chandra