Project Management guide · Cost and resources
Project Cost Management: Processes, Tools and Examples
Project cost management is the work of planning, estimating, budgeting and controlling costs so that a project is completed within its approved budget. It turns scope and schedule into money, sets a baseline, and then tracks actual spending against it so problems are spotted early.
Key takeaways
- Cost management covers planning, estimating, budgeting and controlling costs.
- The cost baseline is the time-phased budget that performance is measured against.
- Earned value shows whether money spent is buying the planned amount of work.
- Forecast early and often so overruns are caught while they are still small.
The four core processes
The PMBOK Guide (6th edition) describes cost management as four processes. Later editions organise the material differently, but the underlying work is the same.
| Process | What it produces | Key question |
|---|---|---|
| Plan cost management | A cost management plan | How will we estimate, budget and control costs? |
| Estimate costs | Cost estimates and their basis | What will each piece of work cost? |
| Determine budget | The cost baseline and funding requirements | How much do we need, and when? |
| Control costs | Performance measures, forecasts and change requests | Are we on budget, and where will we finish? |
Types of project cost
| Cost type | Meaning | Example |
|---|---|---|
| Direct | Traceable to the project | Contractor fees, project software licences |
| Indirect | Shared overheads allocated to the project | Office rent, finance team time |
| Fixed | Does not change with volume of work | A one-off equipment purchase |
| Variable | Changes with the amount of work | Hourly labour, materials per unit |
| Sunk | Already spent and cannot be recovered | Money spent on a cancelled design |
| Opportunity | The value of the best alternative given up | Profit from a project you chose not to run |
How cost management works in practice
- Agree how costs will be estimated, measured and reported in the cost management plan.
- Break the work down with a work breakdown structure and estimate each work package.
- Add contingency reserves for known risks and roll the estimates up into a time-phased cost baseline.
- Secure funding, including any management reserve held by the sponsor.
- Record actual costs as work is done and compare them with the plan using earned value management.
- Forecast the final cost, take corrective action, and raise change requests when the baseline must change.
Worked example
A website rebuild has a cost baseline of $200,000 spread over eight months. At the end of month four the plan said $80,000 of work should be done (planned value). The team has completed work worth $70,000 (earned value) but spent $85,000 (actual cost).
- Cost variance = EV - AC = 70,000 - 85,000 = -$15,000 (over budget).
- Cost performance index = EV / AC = 70,000 / 85,000 = 0.82: each dollar spent is producing about 82 cents of planned work.
- Estimate at completion = BAC / CPI = 200,000 / 0.8235 = about $242,857 if this efficiency continues.
The project manager now has a clear, early signal and can look for the cause before the overrun grows.
Tools and techniques
- Cost estimation methods: analogous, parametric, bottom-up and three-point.
- Reserve analysis for contingency and management reserves.
- Earned value management and the S-curve.
- Financial appraisal: cost-benefit analysis, net present value and return on investment.
- Spreadsheets or project management software with budget and timesheet features.
Common mistakes
- Estimating before the scope is clear, then treating the estimate as a promise.
- Leaving out indirect costs, licences, training or the cost of internal staff.
- Tracking spend only, without measuring how much work it bought.
- Hiding contingency inside individual estimates instead of showing it openly.
- Waiting for month-end finance reports instead of tracking costs weekly.
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Frequently asked questions
What is project cost management?
It is the set of processes used to plan, estimate, budget and control project costs so the project finishes within its approved budget.
What are the four processes of project cost management?
In PMBOK 6 they are plan cost management, estimate costs, determine budget and control costs.
Why is project cost management important?
Without it, overspending is often discovered too late to fix. Good cost management gives early warning and supports better decisions about scope and priorities.
What is a cost baseline in project cost management?
The approved, time-phased budget for the project's work, including contingency reserves but excluding management reserve. Performance is measured against it.
What is the difference between a budget and an estimate in project cost management?
An estimate is a prediction of what work will cost. A budget is the approved amount of money, built from the estimates plus reserves.
What are direct and indirect costs in project cost management?
Direct costs can be traced to the project, such as contractor fees. Indirect costs are shared overheads, such as office space, allocated to it.
Who is responsible for project cost management?
The project manager manages costs day to day, while the sponsor approves the budget and holds the management reserve.
How does earned value management support project cost management?
It compares planned value, earned value and actual cost to measure cost and schedule performance; see earned value management.
How do you control costs as part of project cost management?
Track actual costs against the baseline regularly, analyse variances, forecast the final cost and take corrective action or raise change requests early.
Do Agile projects use project cost management?
Yes. Agile teams often fix cost per sprint or release and vary scope, tracking burn rate and value delivered rather than detailed task budgets.
What is a cost overrun in project cost management?
Spending more than the approved budget. Common causes are unclear scope, optimistic estimates, scope creep and poor tracking.