Scenario 2 – role of the contractor, QS and unit rate estimating – in CMA1 The inexperienced client is interested in understanding the cost breakdown of the project and has asked you to review the estimating data in the table below. Use this to assess the unit rates produced by the Contractor QS and the returned priced Bill of Quantities included in the CMA. Estimating data for unit rate pricing Material Details Waste Cost Mortar: 1:3 gauged mortar mix 5% Cement Sand 1m3 cement,1400kg 3m3 sand, 4800kg Shrinkage 25% £90.00 per tonne £30.00 per tonne Bricks Assume 10m2 102.5mm brickwork, to be in Staffordshire Smooth Blue Facing Perforated. Laid in stretcher bond, gauged mortar 1:3 0.05m3 mortar for 10m2 7% 600 half-brick £250.00 per thousand delivered to site, Unloading Cement Bricks Per tonne NA 1 labourer £30 Included in cost of material Labour details Gang Output cost Brickwork 2 Bricklayers 1 labourer Output of 1 bricklayer 60 brick per m2 1 Bricklayer £60.00 per hour 1 labourer £30 per hour Plant Type of Plant Output Cost Mortar Mix 100-litre mixer 4m3/hour £20.00 per hour Allow 15 % for overheads and profit
Scenario 2 – role of the contractor, QS and unit rate estimating – in
CMA1
The inexperienced client is interested in understanding the cost breakdown of the project and has
asked you to review the estimating data in the table below. Use this to assess the unit rates
produced by the Contractor QS and the returned priced Bill of Quantities included in the CMA.
Estimating data for unit rate pricing
Material Details Waste Cost
Mortar: 1:3 gauged mortar mix 5%
Cement
Sand
1m3 cement,1400kg
3m3 sand, 4800kg
Shrinkage
25%
£90.00 per tonne
£30.00 per tonne
Bricks
Assume 10m2
102.5mm brickwork, to
be in Staffordshire
Smooth Blue Facing
Perforated. Laid in
stretcher bond, gauged
mortar 1:3
0.05m3 mortar for 10m2
7% 600 half-brick
£250.00 per thousand
delivered to site,
Unloading Cement
Bricks
Per tonne
NA
1 labourer £30
Included in cost of
material
Labour details Gang Output cost
Brickwork 2 Bricklayers
1 labourer
Output of
1
bricklayer
60 brick
per m2
1 Bricklayer £60.00
per hour
1 labourer £30 per
hour
Plant Type of Plant Output Cost
Mortar Mix 100-litre mixer 4m3/hour £20.00 per hour
Allow 15 % for overheads and profit
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