Estimate of Building Work

Long Wall Short Wall Method

The Long Wall Short Wall method is a straightforward approach for estimating quantities of different construction tasks. Here’s how it works:

Understanding the Walls

• Long Walls: These run in a longitudinal direction, determining the external length of the structure.
• Short Walls: These are internal walls, generally running transversely.

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Calculating Quantities

To find the quantities of various tasks, follow these steps:

• Measure the lengths of both long and short walls.
• Multiply these lengths by the width and height of the wall.

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Special Considerations

Be mindful of differences in dimensions at various heights due to factors like footing or height offset.
Example
Let’s take a look at an example:

Item Description	No.	Length (m)	Width (m)	Height (m)	Quantity (Cum)	Remark
Earthwork in Excavation
Long Wall	2	7.20	0.90	0.90	11.664	Length = 6.30+0.90 = 7.20m
Short Wall	2	4.40	0.90	0.90	7.128	Length = 5.30-0.90 = 4.40m

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Centre Line Method

The Centre Line Method offers a quick way to estimate building work, especially for circular or polygonal structures:

Determining Centre Line Length

• Calculate the total centre line length of long and short walls with similar foundations and footings.
• Multiply this length by width and height to find the quantities.

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Considerations

• This method is suitable for buildings with no inner or cross walls.
• Special attention is needed at junctions.

Example

Item Description	No.	Length (m)	Width (m)	Height (m)	Quantity (Cum)	Remark
Earthwork in Excavation	1	23.2	0.90	0.90	18.79	Total Center length = 23.2
Foundation Concrete	1	23.2	0.90	0.30	6.26
Foundation Brickwork
– First Footing	1	23.2	0.60	0.30	4.176
– Second Footing	1	23.2	0.50	0.30	3.48
– Plinth Wall	1	23.2	0.40	0.60	5.568
Superstructure Brickwork	1	23.2	0.30	0.30	2.088	Deduction for opening has to be done.