Change Control

Change control is the formal process for managing any modification to an agreed scope of work, specification, or contract after the original agreement is in place. Without it, changes get made on verbal instruction, costs rise without authorization, and disputes follow when the final invoice doesn't match customer expectations. For project-based businesses - contractors, AV systems integrators, office furniture specialists, and commercial fit-out companies - change control is one of the highest-value commercial processes to run well. It protects margin, creates a clear record of what was agreed, and keeps customer relationships intact through the adjustments that arise on almost every project.

What Triggers a Change Control Event

Changes arrive from multiple directions. A client may request additional scope once work is underway - extra rooms included, upgraded specifications, a different product or finish. The site team may identify a practical issue that requires a design modification. External factors - a product being discontinued, a delivery delay that forces a substitution - may require a change that needs customer sign-off before work proceeds. Each of these situations needs to be captured and authorized before costs are committed or additional work starts.

The trigger for a change control event should always be documented immediately: who raised the change, what was requested, and when the request arrived. From that point, the project manager or estimator can assess cost and programme impact before communicating a revised price or timeline to the customer.

Change Control in Practice

A working change control process typically follows this sequence: the change is identified and logged with a unique reference; cost and programme impact is assessed; a formal change instruction or variation order is issued to the customer; the customer approves in writing; work proceeds and the cost is added to the contract sum. The change record becomes part of the project file and feeds directly into the final account at project close.

The label varies by industry - construction uses variation orders, AV and office furniture projects may use change instructions or scope amendments. The underlying process is the same. The key is that every agreed change has a written reference before work starts, and that reference is tracked through to invoicing.

In Zigaflow, revised quote versions can be issued and accepted independently of the original, creating a clear audit trail for each approved scope change without overwriting the original agreed price.