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Assemblies Estimating

Design. Stage 1 Preconstruction. Stage 2: Procurement. Conceptual Planning. Stage3: Construction. Stage 4: Project Close-out. Assemblies Estimating. Assemblies (Systems) Estimating. Done in the design stage and can provide accuracy in the ± 10% range

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Assemblies Estimating

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  1. Design Stage 1 Preconstruction Stage 2: Procurement Conceptual Planning Stage3: Construction Stage 4: Project Close-out Assemblies Estimating

  2. Assemblies (Systems) Estimating • Done in the design stage and can provide accuracy in the ± 10% range • Needs at least design detail approaching the 25-30% complete range. • Not adjusted for time, location, design fees and O&P • Sales tax on material to be added. ASSUME MATERIAL COST 50% OF TOTAL COST • large companies develop their own cost guides • R.S. Means publishes “Assemblies Cost Data” which is updated annually.

  3. Using Means Assemblies Cost Data • Commercial buildings are broken-down into smaller systems “divisions” and components according to the “Uniformat”. We used the same system in SF estimate • The idea is that we are trying to create a table in the same format as the ones we used in SF detailed estimate. We are using the same systems/components column. Then, we fill the specs and the cost columns with specs and costs of our project.

  4. Examine the example page 225 of Means page L-97 with tables page 229 of Means page L-96, subdivision 1.1. Try to relate the assembly number and description to the cost. • After the costs of the 12 systems are obtained, complete a table similar to the one shown in Figure 5-16 . • Notice that tax, general conditions and O&P are computed in that table. Also, the cost is adjusted for location and time. Finally design fees are added. • The term “General Conditions Work” means all work and associated cost to complete the Construction Work that is not included in CM/Contractor’s Base Fee or in Bid Packages; including, but not limited to, items required by the exhibits.“ • Contingencies: errors and oversights, imperfections in estimating methods, accidental events during construction, economics and environmental conditions, etc • The final step is to compute the cost/SF by dividing the cost by floor area.

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