Estimation 1Lesson 2

Estimating Techniques

◦ Internal finishes

Estimation 1

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

Resources◦ Cost databases◦ Build up from first principles

Unit Rate

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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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

Square stopping (m)

75mm Classic coving (m)

Walls -1 layer 10mm Noiseline, 1 layer 13mm Noiseline both sides, fixed to steel, stopped to level 4 (m2)

Sound sealant (m)

Bulkhead – 13mm Standard, fixed to timber, stopped to level 4 – 300mm wide (m)

Estimating calculations