8.5 Contingency Planning & Management

Contingency planning and management represent the financial and schedule manifestation of the risk management process. In construction management, contingency is not a generic "slush fund" or a buffer to hide poor performance; rather, it is a systematically calculated reserve of money and time set aside to cover the cost and schedule impacts of identified, accepted risks and unforeseen events.

Defining Contingency: Cost vs. Schedule

Under CMAA standards, contingency is categorized into two types:

1. Cost Contingency: A monetary reserve added to the project budget to cover unforeseen cost increases.
2. Schedule Contingency (Schedule Buffer): A time reserve added to the project schedule (often placed at the end of the project or before critical milestones) to absorb delays along the critical path without pushing out the contract completion date.

Types of Project Reserves

In a standard project delivery system—particularly in a Construction Management at Risk (CMAR) or Design-Build arrangement—project reserves are structured into three distinct categories:

1. Owner's Contingency (Project Contingency)

The Owner's Contingency is held and controlled by the Owner, with the CM serving as the key advisory administrator. This fund is reserved for risks that are contractually allocated to the Owner.

• Purpose: To pay for Owner-directed scope changes, design errors and omissions (since the Owner typically holds the design contract), regulatory changes, and unforeseen site conditions (e.g., encountering hazardous materials).
• Management: The CM evaluates all requests for Owner's Contingency to ensure they represent legitimate Owner-responsible changes. The CM then processes them via formal Change Orders.

2. Contractor's Contingency (Construction Contingency)

In a Guaranteed Maximum Price (GMP) or CMAR contract, a specific contingency is established within the GMP. This fund is held and managed by the Contractor to cover risks associated with the execution of the work.

• Purpose: To cover execution risks, such as minor estimating omissions, subcontractor default, trade coordination clashes, weather-related delays, and repair of damaged work where the responsible party cannot be identified.
• Management: The Contractor must notify the CM when they intend to draw from the Contractor's Contingency, providing documentation of the execution issue. Under many CMAR contracts, any unused Contractor's Contingency at the end of the project is returned to the Owner or shared between the Owner and Contractor according to a pre-negotiated Shared Savings Clause (e.g., 70% to Owner, 30% to Contractor). This shared savings model incentivizes the contractor to manage execution risks efficiently.

3. Management Reserve

The Management Reserve is a separate fund held at the executive level of the Owner’s organization, outside the project manager’s baseline budget.

• Purpose: Unlike project contingencies, which cover "known unknowns" (risks identified in the risk register), the Management Reserve covers "unknown unknowns"—catastrophic, unforeseeable events that completely disrupt the project (e.g., a natural disaster, a national economic collapse, or a global pandemic).
• Management: Accessing the Management Reserve requires high-level executive authorization and a formal amendment to the project's overall capital budget baseline.

Sizing the Contingency

The CM plays a critical role in advising the Owner on the size of project contingencies. There are two primary methods for sizing contingency:

1. Deterministic Method (Percentage-Based): Historically, contingency was sized as a flat percentage of the estimated construction cost (e.g., 10% during the conceptual design phase, reducing to 5% during the construction phase). While simple, this method does not reflect the unique risk profile of the project. A standard commercial warehouse and a high-tech cleanroom project would be assigned the same contingency percentage, despite having vastly different risk profiles.
2. Probabilistic Method (Risk-Adjusted): In accordance with modern CMAA standards, the CM utilizes quantitative risk analysis to size contingency. By running a Monte Carlo simulation or calculating the project's total Expected Monetary Value (EMV), the CM can recommend a contingency budget linked to a specific confidence level. For example, the simulation might indicate that a cost contingency of $600,000 gives the project a P80 (80% probability) of finishing within budget. The Owner can then align the contingency size with their risk tolerance.

Contingency Management and the Drawdown Curve

Managing contingency is a dynamic process. The CM tracks the remaining contingency balance using a Contingency Drawdown Curve. This S-curve plots the planned versus actual contingency expenditure against project time or physical progress.

Early in the project, during excavation and foundation works, the risk profile is at its highest, and the slope of the drawdown curve is typically steep. As the project reaches major milestones—such as topping out the structure, drying in the building, and completing MEP rough-ins—the risk profile decreases. This is known as Risk Retirement.

When a risk is retired without occurring, the CM should recommend releasing the corresponding contingency funds. Releasing contingency allows the Owner to either:

• Reallocate the funds to purchase project enhancements or upgrades that were previously deferred.
• Return the funds to the organization's capital budget for use on other projects.

Scenario: Contingency in Action

Consider a CMAR project for an office tower:

• Event A (Ductwork Clash): During the mechanical rough-in, the contractor discovers that a major HVAC duct clashing with a structural steel beam. The clash was caused by poor trade coordination during the contractor's drafting of shop drawings. The cost to reroute the duct and refabricate several fittings is $15,000. Because trade coordination is an execution risk, this cost is funded by the Contractor's Contingency. The contract price (GMP) remains unchanged.
• Event B (Unmapped Foundation): During excavation, the contractor strikes an old concrete foundation from a building demolished decades prior. The concrete must be hammered out and hauled away, costing $25,000 and delaying excavation by three days. Because this is an unforeseen subsurface condition (an Owner-held risk), the CM evaluates the claim and authorizes a change order funded by the Owner's Contingency. The GMP is increased by $25,000, and three days are added to the schedule contingency.