Lesson 2

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Estimating Techniques
◦ Internal finishes

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Basic formula for cost
◦ Quantity x Unit Rate = Cost
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Unit rate
◦ What is this built up from

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Plant
◦ What equipment is needed
Labour
◦ What type of labour
Material
◦ What material and quantities
Time
◦ Staged work, accelerated programmes
Margin
◦ Overheads, profit

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Resources
◦ Cost databases
◦ Build up from first principles

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C= Cost of materials
C= Cartage allowance
W= Wastage
F=Fixings
(e)= Minor equipment
L=Labour

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Cost of materials
◦ Market in New Zealand
◦ Who are the main players

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Retail cost
◦ Resources
 Main suppliers
 Builders merchants
 Specialist suppliers/subcontractors
◦ Suppliers Discounts
 Bulk buying
 Certain projects
 Payment terms and conditions/rebates

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Cost of materials
◦ Understanding the specification and knowing your product.
◦ Alternative products

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Plasterboard (4 types of board and gib nails)
Metal studs and fixings ( 2 types)
Metal ceiling batten clips (3 types)
Suspended ceilings tiles (4 types)
Suspended ceiling grid (nog and perimeter trim)

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Cartage
◦ Often included in suppliers rates
◦ Bulk deliveries/small deliveries
◦ Distance – local/rural
◦ Access onto site
◦ Additional labour required for loading

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Wastage
◦ How much wastage do you think?
◦ Modular room sizes
◦ Standard sizes for board
◦ Standard lengths for steel stud/timber
◦ Screws / glues

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Fixings
◦ What type of fixings
 Carpentry nails allow kg/m2
 Quantify and price – acoustic clips

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Equipment
◦ Minor equipment such as nail guns are already part of the labour cost
◦ Any specialist equipment is priced separately

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Labour
◦ What type of skill set is required ?
◦ What is the gang size/site supervision ?
◦ Location and complexity of the project/Out of hours working
◦ The market rates – now or in the future

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Plasterboard
Walls
13mm Standard plasterboard fixed to timber, stopped to level 4 m2
Materials
 Cost of sheet of plasterboard / area of board (m2)
 Cost of delivery (quantity/amount of deliveries)
 $21.60 /(1.2 x 2.4) + $1.00 = $8.50/m2

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Wastage
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What will affect the wastage?
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Check stud heights
Check access/small rooms
Typical 10% allowed
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Material cost x 10%
$8.50 x10% = $9.35/m2

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Labour
◦ Fixing plasterboard
 On the wall
 On the stack
◦ Stopping
 Fix + stop
 ($5.00/m2 x 10%) + $6.00 = $11.50/m2

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Total unit price for 13mm plasterboard, fixed to timber, stopped to level 4 (m2)
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Materials + labour
=$9.85+$11.50
=$21.35/m2

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Labour items
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External angles (m)
◦ Materials + labour
◦ Slimline + (fix and stop slimline)
◦ $1.50/m + ($1.00 + $6.00)/m
◦ Total = $9.00/m

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Walls - 13mm Aqualine, fixed to timber, stopped to level 4 (m2)
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Ceilings – 10mm Standard above 3.0m, fixed to metal battens, stopped to level 4 (m2)
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Walls – 2 layers of 16mm fryeline, fixed to timber, stopped to level 3 (m2)
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Fire sealant (m)

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Square stopping (m)
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75mm Classic coving (m)
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Walls -1 layer 10mm Noiseline, 1 layer 13mm
Noiseline both sides, fixed to steel, stopped to level 4 (m2)
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Sound sealant (m)
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Bulkhead – 13mm Standard, fixed to timber, stopped to level 4 – 300mm wide (m)