The Four Phases Where Capital Project Budgets Quietly Slip
Every capital project begins with a budget. Between feasibility and closeout, that budget can quietly drift in four predictable phases. Here's where owners should focus their attention to reduce risk, strengthen governance, and protect project outcomes.
Have a project in mind?
Talk to a partnerIn this article
Few capital projects exceed budget because of one major decision. More often, budgets drift through dozens of small decisions made over months. By the time an overrun becomes visible, the underlying causes are difficult—and expensive—to reverse.
The encouraging news is that budget overruns typically follow predictable patterns. In our experience supporting capital projects from planning through closeout, four phases consistently present the greatest risk. Recognizing them early enables owners to make informed decisions before small issues become costly problems.
This approach is supported by industry best practice. AACE International Recommended Practice 18R-97 recognizes that an owner's ability to influence project cost is greatest during the earliest stages of planning and design. As projects move into procurement and construction, changes become significantly more expensive and disruptive.
At a Glance
Budget overruns rarely result from a single event. They typically develop through four predictable risks:
- Planning: Unwarranted optimism. Control: Independently validate the feasibility estimate.
- Design: Incremental scope growth. Control: Track all changes with a live change log.
- Procurement: Outdated market pricing. Control: Refresh estimates using current market conditions.
- Construction: Unmanaged change orders. Control: Provide active owner oversight and disciplined contract administration.
1. Planning: Unwarranted Optimism
Every capital budget begins with assumptions. At the planning stage, however, the project is least defined, making it easy to underestimate risks such as site conditions, permitting timelines, utility conflicts, or market volatility.
Early estimates should be treated as informed ranges—not fixed numbers. Contingency should be based on documented project risks rather than a standard percentage. A transparent business case that clearly explains assumptions and risks provides a much stronger foundation for funding and governance decisions.
Catch it early
Independently validate the feasibility estimate and align contingency with documented project risks.
2. Design: Incremental Scope Growth
Projects naturally evolve as stakeholder needs, operational requirements, and technical decisions become better understood. Individually, most design changes appear reasonable. Collectively, they can significantly increase project costs before procurement even begins.
The most effective way to manage this risk is through disciplined scope management. Maintain a live change log that records what changed, why it changed, who approved it, and its impact on budget and schedule. This gives owners visibility into cumulative cost impacts and supports proactive value engineering rather than reactive cost cutting.
Catch it early
Track every scope change against the approved project baseline from the first day of design.
3. Procurement: Estimates Meet the Market
Procurement is where project estimates are tested against current market conditions. Labour availability, material pricing, contractor capacity, and supply chain pressures can quickly expose outdated assumptions.
Procurement strategy also matters. Choosing the appropriate delivery model, clearly defining project scope, and engaging the market early—where appropriate—can improve pricing confidence and reduce procurement risk. Before tendering, owners should refresh cost estimates using current market data to ensure expectations remain realistic.
Catch it early
Update estimates using current market pricing and prepare procurement documents that produce comparable bids.
4. Construction: Managing Change
Construction is where earlier decisions become visible in the budget. While change orders are a normal part of complex projects, unmanaged changes can quickly erode contingency and project value.
Independent owner oversight helps ensure that change orders remain consistent with project objectives, contractual obligations, budget, and schedule. Planning for commissioning, deficiencies, documentation, warranty management, and closeout from the beginning of the project also helps avoid unnecessary costs during the final stages.
Catch it early
Review every change order against the contract and begin planning closeout well before substantial completion.
Owner's Budget Protection Checklist
Before advancing to the next phase, confirm that these four controls are in place:
- ✓ Has the feasibility estimate been independently validated?
- ✓ Are scope changes being tracked against the approved baseline?
- ✓ Has the project estimate been refreshed using current market conditions?
- ✓ Are change orders being evaluated against the contract before approval?
The Bottom Line
Successful capital projects are not defined by perfect estimates—they are defined by disciplined decision-making. Strong governance, informed leadership, and consistent oversight allow owners to identify risks early, make better decisions, and protect project outcomes throughout the project lifecycle.
The earlier risks are identified, the less they cost to address. That is why experienced project leadership delivers value long before construction begins.
Planning a Capital Project?
Whether you're planning a new facility, major renovation, infrastructure investment, or public-sector capital program, Melicaa helps governments, municipalities, Indigenous organizations, healthcare providers, and other public-sector clients strengthen governance, manage risk, and deliver complex capital projects with confidence.
Learn more about our Project Management, Owner's Representative, and Strategic Advisory services, or contact our team to discuss your next project.
References
- AACE International. Recommended Practice No. 18R-97: Cost Estimate Classification System – As Applied in Engineering, Procurement, and Construction for the Process Industries.
- Project Management Institute (PMI). A Guide to the Project Management Body of Knowledge (PMBOK® Guide), Seventh Edition. Project Management Institute, 2021.