Cost Estimation Flashcards
What is the purpose of cost estimation?
- Project viability
- Option comparison
- Funding approvals
- Cost control
- Programming/cashflow
What is the accuracy of concept stage?
50% +-
What is the accuracy of detailed design?
15% +-
What is the trend as detail becomes more accurate?
Cost estimation becomes more accurate.
What is CAPEX?
Capital expenditure (capital cost estimate)
What is CAPEX defined as?
Land, concepts, resources, investigation, design, fees, construction, supervision, financing, overhead etc.
What are the stages of design?
- Concept
- Pre-feasibility
- Feasibility
- Preliminary
- Detailed design
How much do the design phases cost?
Generally 5-10% of Capital Costs, this is subject to variation.
What are some examples of preliminary design studies?
Hydrology, seismic harzards, geotechnical investigations etc.
What are some examples of detailed design?
Detailed hydraulic analysis, earthworks, structural design, building consent application etc.
What are examples of field investigations?
Geotechnical investigations, geological, topo survey, contamination, water quality, hydrology.
What are general items in the bill of quantities?
- P&G
- Mobilisation
- Management plans and submittals
- Misc
Demobilisation.
What are volumes based on?
Geometric models.
What is OPEX?
Operating cost estimate
What do OPEX include?
Operator fees, power supply, admin, monitoring etc.