Excavation Cost & Rate
Rate analysis for excavation work is comparatively easy to establish because it does not require a material analysis. Therefore, we only have to consider the Labour and Equipment cost to determine the rate of excavation work. Generally excavation can be done by handheld tools such as hoes, shovels & etc. or using excavator machine. Depending on the work, we need to decide the method we should go with.
In this article, we are going to discuss the rate analysis for manual excavation using handheld tools. Assume we have to dig a pit for a particular column footing size of 900mm in width and 900mm in length and 1000mm in depth. First thing is we have to investigate the soil type of the site to determine what are the necessary tasks to be undertaken to complete the work properly. Such works can be as follows.
Assume we need a considerable working space of 150mm for each side to get the work done. Then, the practical excavation size of footing is 1200mm width & 1200mm length and 1000mm depth.
Actual excavation volume as per the drawings;
Volume (Actual) = 0.90 m x 0.90 m x 1.00 m
= 0.81 m3
Practical volume to be excavated is;
Volume (Practical) = 1.20 m x 1.20 m x 1.00 m
= 1.44 m3
Assume that 0.50 days required to excavate 1m3 volume using one unskilled labourer. Say the rate for unskilled labourer per day is Rs.1,500.
Therefore, the labour cost of excavation for the given work is;
Labour Cost = 1.44 m3 x (0.50 days / 1m3) x (Rs. 1,500 / 1day)
= Rs.1,080
Assume Tools & Equipment Cost = 5% of Labour Cost
= 0.05 x Rs.1,080
= Rs.54
Total Basic Cost = Labour Cost + Tools & Equipment Cost
= Rs.1,080 + Rs.54
= Rs.1,134
Now let's add Overheads & Profit 20%
Therefore, Total with OH & P 20% = Rs.1,134 /(100%/(100%-20%)
= Rs.1,292.50
After calculating the total cost with OH & P, we have to find the rate for excavation work. In this step, we need to be very careful enough that the total to be divided by the actual volume which is according to drawings. (Should refer the preamble notes in the tender)
Rate for Excavation Work per 1m3 = (Total with OH & P) / Volume (Actual)
= Rs.1,292.50 / 0.81m3
= Rs.1595.68/m3
Rate analysis for excavation work is comparatively easy to establish because it does not require a material analysis. Therefore, we only have to consider the Labour and Equipment cost to determine the rate of excavation work. Generally excavation can be done by handheld tools such as hoes, shovels & etc. or using excavator machine. Depending on the work, we need to decide the method we should go with.
In this article, we are going to discuss the rate analysis for manual excavation using handheld tools. Assume we have to dig a pit for a particular column footing size of 900mm in width and 900mm in length and 1000mm in depth. First thing is we have to investigate the soil type of the site to determine what are the necessary tasks to be undertaken to complete the work properly. Such works can be as follows.
- Shoring
- Working Space
- Dewatering
- Rock required blasting
Assume we need a considerable working space of 150mm for each side to get the work done. Then, the practical excavation size of footing is 1200mm width & 1200mm length and 1000mm depth.
Actual excavation volume as per the drawings;
Volume (Actual) = 0.90 m x 0.90 m x 1.00 m
= 0.81 m3
Practical volume to be excavated is;
Volume (Practical) = 1.20 m x 1.20 m x 1.00 m
= 1.44 m3
Assume that 0.50 days required to excavate 1m3 volume using one unskilled labourer. Say the rate for unskilled labourer per day is Rs.1,500.
Therefore, the labour cost of excavation for the given work is;
Labour Cost = 1.44 m3 x (0.50 days / 1m3) x (Rs. 1,500 / 1day)
= Rs.1,080
Assume Tools & Equipment Cost = 5% of Labour Cost
= 0.05 x Rs.1,080
= Rs.54
Total Basic Cost = Labour Cost + Tools & Equipment Cost
= Rs.1,080 + Rs.54
= Rs.1,134
Now let's add Overheads & Profit 20%
Therefore, Total with OH & P 20% = Rs.1,134 /(100%/(100%-20%)
= Rs.1,292.50
After calculating the total cost with OH & P, we have to find the rate for excavation work. In this step, we need to be very careful enough that the total to be divided by the actual volume which is according to drawings. (Should refer the preamble notes in the tender)
Rate for Excavation Work per 1m3 = (Total with OH & P) / Volume (Actual)
= Rs.1,292.50 / 0.81m3
= Rs.1595.68/m3
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