How to calculate the Plinth Area of Buildings

Definition of Plinth Area:

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

Plinth area is calculated by taking the measurements of walls outer to outer dimensions at the floor level.

While calculate the plinth area the following shall be included:

  • Area of walls at each and very floor level. If there are any common walls between two buildings, half of the area of such walls shall be considered in the plinth area.
  • Internal Shafts for Plumbing, sanitary, electrical, telecom, firefighting and air conditioning ducts of which area is less than two square meters.
  • Openings for Elevators
  • Head room (staircase room) other than terrace level
  • Open verandah with parapet
    • If the area is protected by the projections 100% shall be included.(like parapet wall from bottom side, drop wall from top side, covered with iron grills etc.,)
    • If the area is un protected by the projections 50% shall be included
  • Balconies
    • If the area is protected by the projections 100% shall be included.(like parapet wall from bottom side, drop wall from top side, covered with iron grills etc.,)
    • If the area is un protected by the projections 50% shall be included
  • Recess by cantilevering beyond external walls, bay window is the best example.
    • If the recess height is up to 1.0 meter, 25% of such area shall be includedrecess
  • If the recess height is 1.0 to 2.0 meters, 50% of such area shall be included
  • If the recess height is above 2.0 meters, 100% of such area shall be included.

While calculate the plinth area the following shall not be included:

  • Area of loft
  • Area for architectural features like patties, bands, cornice, slab projections etc.,
  • Terrace area
  • Open staircase
  • Lift machine room
  • Head room at terrace level

The following shall be considered as separate items for plinth area calculation

  • Basement floor
  • Ground floor
  • Upper floor
  • Mezzanine floor
  • Car garage
  • Maid room
  • Portico
  • Domes, Projections at terrace level

Live example for calculation of Plinth Area

Ground Floor

Walls outer to outer area          :           24’ 6” x 40’ 0” (or) (7.45 x 12.19 = 90.82 Sqm)

Deductions

Shop front side area                :           2’ 10-1/2” x 10’ 9” (or) ( 0.848 x 3.28 = 2.78 Sqm)

Backyard area                          :           1’ 9” x 8’ 3” (or) ( 0.533 x 2.52 = 1.343 Sqm)

Open to Sky area                     :           2’ 0” x 24’ 9” (or) ( 0.61 x 7.54 = 4.60 Sqm)

Total deductions                      :           8.723 Sqm

Net Plinth area of Ground Floor           :           90.82 – 8.723 = 82.097 Sqm.

ground-floor-plan

First Floor

Walls outer to outer area          :           24’ 6” x 40’ 0” (or) (7.45 x 12.19 = 90.82 Sqm)

Deductions

Open to Sky area-1                  :           1’ 9” x 8’ 3” (or) ( 0.533 x 2.52 = 1.343 Sqm)

Open to Sky area -2                 :           2’ 0” x 24’ 9” (or) ( 0.61 x 7.54 = 4.60 Sqm)

Total deductions                      :           5.943 Sqm

Net Plinth area of First Floor           :           90.82 – 5.943 = 84.877 Sqm.

1st-floor-plan

Terrace Floor

Head room                               :           Not included in the plinth area.

terrace-floor-plan

Total Plinth area of building

Ground floor                            :           82.097 Sqm

First floor                                 :           84.877 sqm

Total Plinth Area                    :           166.974 Sqm

The following were observed while calculating the Plinth area:

  • Cut out not deducted because this area is less than two square meter
  • Open to sky portions were deducted
  • Car parking at ground floor is included, because it is protected in all directions
  • Shop front side at ground floor deducted, because this is not protected by all sides
  • First floor lobby is included, because it is protected by all the sides
  • Terrace shall not include in plinth area as per definition.

Download the Building Floor Plans: FLOOR PLANS

Download for Building view of balconies : PLINTH AREA

Note:

Reference: Indian standard code for “Method of Measurement of Plinth, Carpet and Rentable areas of Buildings” IS-3861.

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