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**What Is Plinth Area?**

The **total area of the building** including **interior and exterior wall,** measured at floor **level of the basement** or at any story including balconies, is defined as **Plinth Area.**

The **Plinth Area** in simple words can be defined as the **total area** from **external wall **to **external wall **instead of internal wall to the internal wall.

If the measured area is from internal wall to **internal wall **then it is called a** Carpet Area**. Besides this, in other construction terms, the plinth area can also be referred to as the** column pad area,** hence it becomes important to **clarify **before assuming anything.

However, as discussed earlier the **plinth area** is also referred to as the** total area **occupied by the building along with the **interior **or **exterior wall**. It is normally greater by **10 to 20 %** of carpet area, which includes the exclusion of walls and other components.

**Plinth Area Meaning**

**The Plinth Area** is a Covered **Built-Up Area** occupied by the building including internal and external walls, which is generally** 10-20% **more than the **carpet area**. Sometimes Plinth Area is also known as** Built-Up Area.**

**The Plinth Area** is calculated at the floor level of any story or at the **floor level** of the** building basement. **Formula wise it is calculated as the sum of the** Carpet Area **of the building, area of the **balcony**, and areas of the **walls**.

It is mandatory to calculate the** plinth area length** of a building to be** 1-inch** **adjacent **if the unit of measurement used is in **feet**. Calculation of **Plinth Area **provides the **constructor **vital information regarding the cost of the building. Hence it is important to know the** Plinth Area **of the building.

**Plinth Area Definition**

*The total area of the building including interior and exterior wall, measured at floor level of the basement or at any story including balconies, is defined as Plinth Area.*

While calculating Plinth Area, **balconies **are included whereas components such as **ducts/ services and lift shaft** (except in the lowermost floor of lift shaft) and **open cut-out areas** are excluded.

Calculation of the plinth area is done by taking the **external dimensions **of the building at the **floor level** however, in the case of calculating the** floor area** the **internal measure **of the building is which does not include the **thickness **of the walls.

**The Functions of the Plinth Area**

The Plinth Area has the following functions,

- Calculation of
**Plinth Area**provides vital information about building to**architects**and**civil engineers**. - Relying on
**Plinth Area**an architect could design the**blueprints**of construction**projects**. - In similar way,
**civil engineers**utilize the plinth area in order to construct a building unit. **Plinth Level**is laid over the calculated Plinth Area which sustains the**weight of columns**built over it.- Plinth level built over Plinth Area also blocks the
**moisture**of the**ground**to move upward and distribute the**load of columns**and**foundation**evenly. - Plinth Area could give the
**cost estimation**of a building unit after**surveying**and also provides ample information on**property taxes**imposed by some governments.

**Plinth Area Rate**

The **Plinth Area Rate** for rating area and **construction of buildings** is categorized into three parts. This is as listed as follows,

**For Residential Building****For Non-Residential Building/ Commercial Buildings****For Hospital Building**

**1. For Residential Buildings**

In the case of a **residential load-bearing structure** or building, the **foundation plinth area **rate as per the rating agency for** 1 sq.m.** Is **3870**, for super-structure is **8625**, and for finishing is **1450**.

However, for **frame structure**, the rate of the superstructure is **12025 **per **1 sq.m. **and the finishing 1530.

**2. For Non-Residential Building**

For** Non-Residential buildings** in** load-bearing **structures, the foundation plinth area rate per** 1 sq m **is **2980**, super-structure is **7310 **and for finishing is **1495**.

While for the frame structure in Non Residential type, the **foundation plinth area** rate for **1 sq m area **is 4590, with its super-structure and finishing as **9035**, and **1530 **respectively.

**3. Hospital Building**

**Hospital Building** has the lowest rate as compared to Non-Residential and Residential per plinth area. In which in case of a **load-bearing structure**, the **foundation **plinth area rate per** 1 sq.m.** is **2970**, super-structure is **8190**, and finishing is **1495**.

Similarly, for the **frame structure**, the **foundation plinth area** rate pe*r *1 sq.m. is **4590**, for super-structure is **12535**, and for finishing is **1530**.

**Read More: What is Plot Area | Built-up Area | Carpet Area | Types of Area In Building**

**Plinth Area Estimate**

**Plinth Area Estimate** is considered as an **approximate estimate i**n which the plinth area of a building is multiplied with plinth area rate to obtain an estimate for the building i.e. **Plinth area** rate **per sq m x plinth area of the building (in m).**

**Plinth Area Estimate** provides us the proper **construction cost** rather than calculating the details. The plinth area is calculated as per the **roof area** of a building using the** external dimension.** While computing plinth area **courtyard area** etc. should be excluded from it.

**Plinth Area Rates** are subtracted from the cost of the equivalent building in the same **locality **containing **approximately **or exactly the **same finishing **that too at the same **conveniences**.

With the purpose of controlling the difference in the **construction cost **of the building the **desired height **of the building should be built within the **same year **of construction or in **advance**.

The **plinth area** estimation is supported by the Report, Line Plan of building, **Detailed Specifications,** and **Line Plan** of the building for which the plinth area rate is determined.

**How to Calculate Plinth Area of a Flat?**

While we Calculate the** Plinth Area of a Flat**, we must consider the following areas,

- We must consider the area of the wall without
**plinth offsets**at the**floor level**. And if any common walls exist among**two buildings**then only half of the area of such walls should be considered in the**plinth area**. - In case of
**building**with columns that are proposed outside the cladding then**plinth area estimation**is done outside**cladding**. **Components**such as the**lift well**along with**landing**and the vertical duct for**air conditionings**are also estimated.**50%**of the area should be taken into consideration if the area is**uncovered**with**projections**.- Around
**25%**of the total area should be considered while calculating, when the**recess height**is up to**1.0 meters,**however it is to be considered**50%**when the recess height is**1.0 to 2.0 meters**. - To estimate
**plinth Area**of the internal shaft for sanitary installations, garbage chute, telecom, electrical, and**firefighting services**under the condition that these do not go beyond**2m**in the area.^{2} - The area of
**staircase**room or**head room**excluding**terrace**level should be considered. - Similarly components such as
**Machine room**and**Porch**are included as well.

**In the Calculation of Plinth Area, Some Things Should Be Considered That Are?**

- While estimating the
**foundation cost**the plinth area of the**ground level**of the building should be taken into consideration. - Even for estimating
**super-structure cost**the plinth area should be taken for the calculation. - Similarly, for the calculation of the
**roof slab finishing**the plinth area at the**Ground level**of the building is considered for**estimation**. - For Super Structure cost of school building a standard value of
**80%**of the**Super Structure**cost of Non-Residential Buildings is assigned. - For construction of
**super-structure**in earthquake-prone areas, the rates are adopted as per**Annexure-V**in**construction industry.** - For construction in
**sea water front**the construction cost per meter square of area is –**Rs.243**up to**10 km distance.** - Important increment of about
**25%**over the**superstructure**cost of the respective type of building is to be added to the**basement**or ground floor. - Taking Lift charge into consideration an extra
**Rs.34/ m2**should be added in the**plinth area**calculation for the**upper floors.**

**Read More: 18 Components of Building | Building Structure | Parts of a Building**

**While Measuring the Plinth Area, Things Should Not Be included Are?**

As we had discussed things that should be considered in the **calculation **of the **Plinth Area**, It is also important to know the things that should **not be contained.**

This helps in reducing the** construction cost** of the building, **saving **the **extra materials** to be buoyed. Things that should not be included areas listed below,

- Area of
**extra floor**for faciliting accommodation in assembly halls, auditoriums and theatres. **Open platform**- The
**Cantilevered porch**hanging outside **Balcony**of Building- The
**Lofted Area** **Terrace**made at first floor in**multi storey building****Internal sanitary shaft**and**garbage chute**are excluded if they are in excess of**2 m2**with respect to area.- If
**Spiral staircase**is present in the**building**then its area along with**landing**is excluded. - Rising Structures such as
**Towers, Turrets**and**dome**projecting over the terrace should not be calculated. - Area of
**architectural features**like**slab projection**for arranging flower pots and vertical sun breaker or**box louver**projecting out are neglected.

## FAQs

### Plinth Area Meaning

**The Plinth Area** is a Covered Built-Up Area occupied by the building including internal and external walls, which is generally 10-20% more than the carpet area. Sometimes Plinth Area is also known as Built-Up Area.

### Plinth Area Definition

The total area of the building including interior and exterior wall, measured at floor level of the basement or at any story including balconies, is **defined as Plinth Area.**

### How to Calculate the Plinth Area of a Flat?

The plinth area of the Flat can be calculated as the **sum of the Carpet Area of the building, area of the balcony, and areas of the walls.** It is mostly 10-20% more than the carpet area.

### What Is Plinth Area?

**The Plinth Area** is a Covered Built-Up Area occupied by the building including internal and external walls, which is generally 10-20% more than the carpet area. Sometimes Plinth Area is also known as Built-Up Area.

### What is the difference between the plinth area and floor area?

Talking about the **Plinth Area**, it is calculated by taking the external dimensions of the building at the floor level. However, when it comes to calculating the **Floor Area** the internal measure is necessary in order to lay the carpet which does not include the thickness of the walls and an internal measure.

### Is Verandah included in the plinth area?

**Yes,** **Verandah is included in Plinth Area **along with balconies and parapets. However, their area consideration varies accordingly, such as if this area is secured by projections, in plinth area full area is included and if un-secured by projections then only 50% of the area is included.

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