Excavation and Filling: Cost Analysis and Construction Factors

Question 1
Excavation and filling
A) Site preparation
Site preparation in this case involves removing top soil and a cart to heap the soil within
the site for future use.
The unit cost of site preparation involving clearing removing top soil and mechanized
heaping the soil is £ 16.47/m2
To get the total cost, we multiply the unit cost to the total area (shown in attached excel
file attached).
Total cost for site preparation ¿ 16.47∗11250=£ 18528.50
B) Bulk excavation not exceeding 2m deep. The excavation is from 100 mm below ground
level. The unit price for such excavation is £ 19.90/m3
Total cost for bulk excavation not exceeding 2m deep ¿ 19.90∗2813=£ 55972 .07
C) Foundation excavation commencing from 350 mm up to a depth not exceeding 2m deep
is priced at £ 23.35/m3
Total cost for foundation excavation not exceeding 2m ¿ 23.35∗445=£ 10338.50
D) Foundation excavation from a depth of 2 m to 4m is priced at £ 24.00/m3
Total cost for foundation excavation of d >2 m = 24∗375=£ 9008.00
E) Disposal of materials to a nearby disposal site situated 5 km away is priced at £ 6.30/m3
The total cost for disposing materials ¿ 6.30∗2813=£ 17719.80

Filling obtained from excavated material
A) final thickness of filling exceeding 500 deep was priced at £ 2.35/m3
Total cost for filling using excavated material ¿ 2.35∗820=£ 1927.00
B) Imported filling done using clean bricks is priced at £ 5.32
Total cost for import filling ¿ 5.32∗1488=£ 7913.50
Ground remediation and soil stabilization
Compaction
C) Compacting the subgrade is valued at a rate of £ 10.56
Total cost for compacting ¿ 10.56∗355=£ 3752.32
This cost is inclusive of cost of hiring compaction machine as well as paying the operator
of the machine.
In situ Concrete works
Plain in-situ concrete
A) Mass concrete in trench filling is priced at £ 62.52/m3
This includes all equipment used and the materials involved.
Thus, total cost for concreting in trench filling ¿ 65.52∗315=£ 20638.00
Reinforced in-situ concrete
B) Mass concreting in isolated foundation. This is priced at £ 65.00/m3
The unit cost is inclusive of equipment and materials used.
The total cost for concreting in isolated foundation ¿ 65.00∗168=£ 10920.00
C) Horizontal work in structures less than 300 mm thick is priced at £ 58.98/m3

This composes of equipment and materials used.
Total cost for horizontal work ¿ 58.98∗761=£ 44883.78
Masonry
A) Brick work ; engineering bricks; in cement mortar ratio 1:4
The cavity wall will be half brick thick. The unit price for the materials that is cement
mortar plus the bricks is £ 6 .52.
The total cost for brick work ¿ 6 .52∗275=£ 1789 .74
B) Block work 100 mm thick made up of concrete blocks. Face size is 440*125 mm
(Towey, 2012). The unit price for the block work described is £ 15.30
The total cost of the block work ¿ 15.30∗275=£ 4199.85
Summing up the costs, we get;
Cost of construction ¿ £ 374350.86
The profit margin = 3%
Profit ¿ 3
100∗374350.86=£ 11230.53
Overhead = 4%
Overhead ¿ 4
100∗374350.86=£ 14974.03
This means that, the total cost of construction will be ¿ 374350.86+11230.53+14974.03
Total cost=£ 400555.42