 # Estimation of A Building With Plan

Estimation of a Building with Plan

It is process predicting probable cost of project by calculating material quantity and their costing with help of market rates before undertaking of any construction project.

#### Data Required Preparing Estimate:

• Plan, Elevation & section.
• Schedule of opening of door and windows.
• Foundation drawing.
• Column & Beam drawings.

#### 1) Interpretation of Drawing:

Before you directly start calculating quantity, you must precisely and correctly read the construction drawing.

• Check dimension of each block is provided or not.
• Check Schedule of opening is there.
• Check specification of work.
• Check thickness of wall is same or changes.
• Check Rise and tread dimension of stair.
• Check type of foundation and its details drawing.

#### 2) Prepare Estimation Sheet:

Following is a sample sheet for preparing estimate.

While taking length, width and depth/ height dimension remember that not all dimension are given in drawing. Some dimension you need calculate from drawing also.

#### 3) Calculating Quantity:

For example, first quantity of estimation sheet is excavation in foundation. So find out dimension of length, width and depth of excavation from drawing.

Estimation of a Building with Plan

Keep in mind:

• Excavation depth is calculated from ground level to bottom of PCC work.
• Size of trench much be larger than size of footing to provide easy for workers.

Here, Size of footing is 1 m x 1 m. So, consider 0.25 m extra margin on both side of trench.

Length will be = 0.25 + 1 + 0.25 = 1.5 m, and Size becomes 1.5 m x 1.5 m. Depth is given 1.5 m from ground level.

Now, find number of Footing in building = 12 nos. Put this all values in Estimation sheet multiple with each other will gives you quantity of excavation.

In Similar way, you can calculate other quantity like PCC, Footing Concrete; Earth filling, Plinth beam concrete, DPC, Brick Work in Superstructure, RCC Slab Concrete etc.