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Basic formula for cost◦ Quantity x Unit Rate = Cost
Unit rate◦ What is this built up from
Unit Rates
Plant◦ What equipment is needed
Labour◦ What type of labour
Material◦ What material and quantities
Time◦ Staged work, accelerated programmes
Margin◦ Overheads, profit
Unit Rate
C= Cost of materials C= Cartage allowance W= Wastage F=Fixings (e)= Minor equipment L=Labour
CCWF(e)L
Retail cost◦ Resources
Main suppliers Builders merchants Specialist suppliers/subcontractors
◦ Suppliers Discounts Bulk buying Certain projects Payment terms and conditions/rebates
CCWF(e)L
Cost of materials◦ Understanding the specification and knowing your
product.◦ Alternative products
CCWF(e)L
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)
CCWF(e)L
Cartage◦ Often included in suppliers rates◦ Bulk deliveries/small deliveries◦ Distance – local/rural◦ Access onto site ◦ Additional labour required for loading
CCWF(e)L
Wastage◦ How much wastage do you think?◦ Modular room sizes◦ Standard sizes for board◦ Standard lengths for steel stud/timber◦ Screws / glues
CCWF(e)L
Fixings◦ What type of fixings
Carpentry nails allow kg/m2 Quantify and price – acoustic clips
CCFW(e)L
Equipment◦ Minor equipment such as nail guns are already
part of the labour cost◦ Any specialist equipment is priced separately
CCFW(e)L
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
CCFW(e)L
PlasterboardWalls13mm 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
Estimating calculations
Wastage
What will affect the wastage?
Check stud heights Check access/small rooms Typical 10% allowed
Material cost x 10% $8.50 x10% = $9.35/m2
Estimating calculations
Labour◦ Fixing plasterboard
On the wall On the stack
◦ Stopping
Fix + stop ($5.00/m2 x 10%) + $6.00 = $11.50/m2
Estimating calculations
Total unit price for 13mm plasterboard, fixed to timber, stopped to level 4 (m2)
Materials + labour =$9.85+$11.50 =$21.35/m2
Estimating calculations
Labour items
External angles (m)◦ Materials + labour ◦ Slimline + (fix and stop slimline)◦ $1.50/m + ($1.00 + $6.00)/m
◦ Total = $9.00/m
Estimating calculations
Walls - 13mm Aqualine, fixed to timber, stopped to level 4 (m2)
Ceilings – 10mm Standard above 3.0m, fixed to metal battens, stopped to level 4 (m2)
Walls – 2 layers of 16mm fryeline, fixed to timber, stopped to level 3 (m2)
Fire sealant (m)
Estimating calculations