Change Order Simulation
Adjust change cost, markup, time impact and supporting evidence and observe how proposed change value, cumulative contract growth, revised duration, commercial exposure and approval readiness respond.
Control the scope, value, time and authority of a contract change together.
The worked example starts from a £5.0 million contract with a 240-day duration and £200k of previously approved changes. A new scope change is evaluated for direct cost, markup, time extension, extended overhead and supporting evidence.
Change Order Simulation — Step by Step
Eight locked stages move from change context through cost, markup, time impact, evidence strength, an urgent field-instruction challenge and a management review.
Establish the Change Order Context
Change Value, Time and Approval Readiness
Reveal the change context to begin.
Separate change entitlement, valuation, time impact and approval authority.
Scope definition
The change should identify exactly what is added, deleted or modified. Weak scope definition creates uncertainty in quantities, price, interfaces and completion obligations.
Valuation
This model shows direct cost, markup and a simplified extended-overhead amount separately. Real valuation must follow the contract’s pricing hierarchy and applicable records.
Time impact
A time extension should be supported by schedule causation. This tool treats the selected extension as justified days and applies the selected extended-overhead rate for illustration.
Authorization
Authority matters independently of technical necessity. Urgent work may require interim direction, not-to-exceed limits or provisional records when full price/time agreement cannot be reached first.
Markup Amount= Direct Change Cost × Markup %.
Extended Overhead= Time Extension × Extended-Overhead Rate per Day.
Proposed Change Order Value= Direct Cost + Markup + Extended Overhead.
Revised Contract Value= Original Value + Prior Approved Changes + Proposed Change Order Value.
Important: this is an illustrative learning model, not a legal entitlement or pricing determination. Contract terms, governing law, notice, pricing clauses, schedule analysis and authorization rules control the actual outcome.
Build Your Own Change Order Scenario
Experiment Mode is isolated from the guided demonstration. Change all commercial, schedule and evidence assumptions freely.
Quick Knowledge Check
Change Order Control Cues
Define Scope
Describe exactly what is added, deleted or modified and identify affected deliverables, interfaces and acceptance requirements.
Confirm Authority
Identify who has contractual authority to direct and approve the change. Technical need does not automatically equal commercial authorization.
Substantiate Cost
Support quantities, labour, materials, equipment, rates, quotations, credits and markup according to the contract’s pricing mechanism.
Substantiate Time
Link the change to schedule logic and show causation, mitigation and impact on controlling or critical work.
Track Cumulative Change
Monitor the combined effect of approved changes on contract value, duration, interfaces and performance risk.
Control Urgent Work
Use interim authorization, limits and contemporaneous records when work must proceed before full commercial agreement.
Urgency may justify proceeding before every term is finalized, but it should increase—not reduce—the discipline applied to authorization, records, limits, reservations and follow-up agreement.