Delay & Disruption Protocol

Navigating Construction Claims: A Practical Guide to the SCL Delay and Disruption Protocol

In complex construction projects, timeline overruns and workflow interruptions frequently lead to costly disputes between employers and contractors. To manage these challenges fairly and efficiently, the Society of Construction Law (SCL) published the 2nd Edition of its Delay and Disruption Protocol to provide a practical and principled framework for resolving time and cost claims without resorting to litigation. Applicable to projects of any scale or complexity, the SCL Protocol serves as an industry benchmark for good change management and dispute avoidance.

1. Understanding the Difference: Delay vs. Disruption

Although frequently conflated in practice, delay and disruption represent distinct legal and technical concepts under the Protocol:

Delay focuses on time and project duration. It occurs when work activities take longer than planned, specifically impacting the critical path to project completion. A critical delay entitles the contractor to apply for an Extension of Time (EOT) to adjust the contractual completion date and gain relief from liquidated damages.
Disruption focuses on productivity and work efficiency. It involves disturbance or hindrance to normal working methods, causing resources to accomplish lower output rates than reasonably anticipated. Disruption leads to loss and expense regardless of whether the affected activities lie on the critical path.

While disruption can cause activity delay, and project delay can force accelerations that disrupt working methods, each requires a separate analytical approach and distinct evidentiary proof.

2. Core Principles for Extension of Time (EOT) Claims

The Protocol outlines 22 Core Principles designed to balance the risk allocation between contracting parties. Key principles governing time extensions include:

Contemporaneous Assessment (“Do Not Wait & See”): The Protocol explicitly discourages waiting until project completion to assess delay impacts. EOT applications should be submitted and evaluated as close in time to the delay event as possible—typically utilizing a Time Impact Analysis (TIA) on a logic-linked Critical Path Method (CPM) programme.
Robust Record Keeping: Contracting parties should reach a clear agreement on the types of records to be kept (e.g., daily site reports, resource logs, updated programmes) and allocate adequate resources to maintain them.
Ownership of Float: Unless the contract expressly states otherwise, total float belongs to the project. An EOT is only granted if an Employer Risk Event uses up available total float and extends the critical path beyond the current completion date.

3. Concurrent Delay and Monetary Compensation

One of the most contentious issues in construction management is concurrent delay, which occurs when an Employer Risk Event and a Contractor Risk Event happen at the same time and both independently cause delay to the completion date.

EOT Entitlement: Under Core Principle 10, a contractor’s concurrent delay does not reduce the EOT due for the employer’s delay.
Prolongation Compensation: Entitlement to an EOT does not automatically confer an entitlement to monetary compensation. For prolongation costs under Core Principle 14, a contractor can only recover compensation if it can isolate the additional costs caused specifically by the employer delay; if those costs would have been incurred anyway due to the contractor’s concurrent delay, compensation is not recoverable.

4. Substantiating Disruption Claims

The objective of a disruption analysis is to measure the loss of productivity and demonstrate the resulting loss and expense caused by employer risk events.

To prove disruption, the Protocol strongly favors project-specific, productivity-based methodologies over cost-based comparisons. In particular, the Measured Mile analysis is highlighted as the most reliable method. It compares productivity achieved during unimpacted periods or areas of the project with productivity achieved during disrupted periods on identical or similar work activities.

Cost-based methods (such as comparing estimated tender costs against actual incurred costs) are considered far less persuasive because they fail to isolate productivity losses caused by contractor inefficiencies, poor supervision, or tendering errors.