**CENTER LINE METHOD OF ESTIMATION**

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CENTER LINE METHOD OF ESTIMATION:

There are three different
methods of estimation.

1.
Center line method.

2.
Long and short wall
method.

3.
Crossing method.

In this article, I will discuss center line
method briefly for the estimation of materials.

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WHAT IS CENTER LINE METHOD:

In this method of estimation, the total center line length of
walls in a building is first calculated, then the center line length is
multiplied with the breadth and depth of respective item to get the total
quantity at a time.

The center line length for different sections of walls in a
building shall be worked out separately. For verandah walls or partition walls
joining the main walls, the center line length shall be reduced by half of
the breadth of the layer of main wall that joins with the partition or verandah
wall at the same level. The number of such joints is studied first to obtain
the center line length.

By using this method estimation can be finished more quickly.
This method is as accurate as other methods (except unsymmetrical wall). This
method is suitably used for estimating circular, rectangular, hexagonal,
octagonal etc shaped building.

Let us take an example:

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FOR ONE ROOM BUILDING:Fig 1

First we need to calculate total center line
length of the building.

**Total center line length**= 2 x 5.3 + 2 x 4.3 = 19.2 m.

**1. Earthwork in excavation**= Total center line length x breadth x depth

= 19.2 x 0.9 x (0.3+0.3+0.3)

= 19.2 x 0.9 x 0.9

= 15.52 cu.m

**2. Concrete in foundation**= 19.2 x 0.9 x 0.3 = 5.18 cu.m

**3. a) Brickwork in foundation for 1st footing**= 19.2 x 0.6 x 0.3 cu.m

**b) Brickwork in foundation for 2nd footing**= 19.2 x 0.5 x 0.3 = 2.88 cu.m

**4. Brickwork in superstructure**= 19.2 x 3.5 x 0.3 = 20.16 cu.m

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FOR TWO ROOM BUILDING:Fig 2

**Total center line length**= 2 x (5.3+5.3) + 3 x 4.3 = 34.1 m.

**1. Earthwork in excavation**= Total center line length x breadth x depth

= 34.1 x 0.9 x (0.3+0.3+0.3)

= 34.1 x 0.9 x 0.9

= 27.62 cu.m

**2. Concrete in foundation**= 34.1 x 0.9 x 0.3 = 9.20 cu.m

**3. a) Brickwork in foundation for 1st footing**= 34.1 x 0.6 x 0.3 = 6.13 cu.m

**b)**

**Brickwork in foundation for 2nd footing**= 34.1 x 0.5 x 0.3 = 5.11 cu.m

**4. Brickwork in superstructure**= 34.1 x 3.5 x 0.3 = 35.8 cu.m

Thus you can estimate quantity of different
items such as

**Quantity of D.P.C**= Total Centre line length x Breadth of foundation x Thickness of D.P.C

**Quantity of plinth beam**= Total Centre line length x Breadth of the beam x Depth of beam.

**Quantity of wall plaster for 2 sides**= Total centre line length x Height of wall x Thickness of plaster.

**Quantity of Paint for 2 sides of wall**= Total centre line length x Height of wall x 2 = Area of paint in

**sq.ft**

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