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## Building Estimation By **Center Line Method**

**In this method**, sum **total length** of **center lines of walls,** long and s**hort has to be **found out. **Find the total **length of **center lines** of walls of the **same type.** Long and short have the same **type of foundation** and footing and they **find the quantities** by multi-plying the** total center length** by the respective **breadth and height.**

In t**his method,** the length will** remain the same** for excavation in the** foundation** for concrete in the** foundation.** For all footings and **for the superstructure**. (With slight difference **when there are** cross walls or the** number of junctions)**. This method is** quick **but **requires special **attention and** consideration** at the junction,** meeting points **of cross walls**, etc.**

**Read More: Residential Building Estimation Excel Sheet**

## How to Calculate Center Line In Plan

**Center line length of one wall = inner dimension of room + Wall thickness**

**= Inner dimension of room + ½ x Wall thickness of one side + ½ x wall thickness of other.**

**Centre line length of horizontal wall**

= 4 + 0.45 + 0.45

**= 4.90 m**

**Centre line length of vertical wall**

= 3 + 0.45 + 0.45

= 3.90 m

**Total Length of excavation for foundation**

= 2(4.90 + 3.90)

= 17.6 m

**Quantity of excavation for foundation**

= **Total length** of centre **line of walls **x **breath of trench** x **Depth of trench**

= 17.6 x 0.9 x 1.2

**= 19.01 m3**

**For rectangular,** circular or** polygonal buildings** having no inter **or cross walls,** this method is **quite simple** but for buildings **having a cross or partition** walls, **for every junction of partition** or cross walls **with main walls, **a half breath of the** respective item** or **footing **is to be **deducted** from the **total center length.**

**Net Centre line length – (½ x breath of wall x number of the junction)**

**Following Points in relation to the center line method should be noted.**

- The
**term junction**is used to**indicate**the meeting**points of cross walls**or partition walls with**main walls.**

**For instance,**if there is**one cross wall**there will be**two junctions**. At the**corner of a**building,**no junction**is formed.

**For rectangular**building with**no cross wall**there will**not be any junction**and hence no**deduction**from the**centre line length**will be required. It is**fact that**is certain portion taken**twice is counter**balanced by**same amount**portion left out**at the corner.**

- T
**he breath indicates**the width of**item**whose**centre line**is being**worked**, for**instance it**will be the**width of trench**of excavation and**foundation concrete.**But for**brick masonry**up t**o plinth**or for superstructure**will be equal**to the corresponding**thickness of wall.**

**For a two-room building **with the inner **cross wall**, two junctions **will be formed** shown in fig.

**Total Centre Line length**

= (2 x AB + 2 X BC + EF)

= (2 X 9.50 + 2 X 5.5 + 5.5)

If this **center line length** is multiplied **by the width** and depth, **the quantity at** junction P and **Q will come twice**, the quantity of** each being equal** to ** ( ½ x width x Depth )**.

**Hence **the quantity of these** two junctions **must be deducted to **get the net center line length.**

**Net Center Line Length **

**= (Total Centre line length – (width/ 2) x No. of junction)**

= 35. 50 – (½ x 0.90) x 2

**= 34. 60 m**

## Center Line Method of Building Estimation Example

Let’s t**ake** on the **example** of a** building plan **and c**alculate its quantity **by using **the center line method of estimation.**

**Building Estimation by Center Line Method Excel Sheet**

**Download Building Estimation Excel Sheet**

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