Controlling Change Orders and Their Impact on Contract Cost

Few construction contracts are completed without changes. Owners may refine requirements, designers may resolve coordination issues, and site conditions may call for different solutions. Each change can be reasonable on its own, but without a clear control system, many small variations can add up to significant cost overruns, delays and disputes.

Documenting the Justification for Each Change

The first question for any proposed change is why it is needed. A structured change order system records the source and reason for the variation, whether it is an owner request, a design development, an unforeseen site condition or a correction of an error. This documentation helps the owner decide whether the change is necessary and supports a fair assessment of responsibility.

• A clear description of the proposed change and the affected drawings or specifications.
• The reason for the change and who requested it.
• Any alternatives considered, including the option of not proceeding.

Pricing and Schedule Impact Before Approval

A change should be priced and its time impact assessed before approval, not after the work is done. Pricing is typically based on contract rates where applicable, with new rates agreed for items that are not covered. The schedule impact is evaluated against the current program to determine whether the change affects critical activities or can be absorbed within available float.

• A cost breakdown linked to BOQ items and agreed rates.
• An assessment of the effect on the project schedule and milestones.
• Consideration of indirect effects, such as rework or impacts on other trades.

When this information is available before approval, the owner can make an informed decision and the contractor has a clear instruction with agreed terms.

Keeping Cost Under Control and Disputes Low

A change order log that tracks all proposed, approved and rejected changes gives the project team a live view of how the contract value is evolving. Combined with regular reporting, it allows owners to see the cumulative effect of changes early and to take corrective decisions where needed.

Clear procedures also reduce disputes. When every variation is documented, priced and approved in writing, there is less room for disagreement at the final account stage.

VARIO (Al-Mukhtalef) supports clients in contract and tender management, including change order review, pricing assessment and schedule impact analysis, helping keep contract costs under control and owner-contractor relationships constructive.