What Is a Change Order in Construction?

A construction contract fixes a scope, a price and a duration. Any change to those three is a change to the bargain, so it needs the same agreement the original bargain had. That is why a change order carries signatures rather than an acknowledgement, and why the amount and the time extension are stated explicitly rather than reserved for later.

The failure mode is predictable. Under schedule pressure the field agrees to proceed on a verbal instruction and the paperwork follows "when things calm down". It does not calm down, the project ends, and the contractor is left arguing entitlement for work nobody disputes was performed. Getting the instrument signed before the work proceeds is unglamorous and it is the entire protection.

Four categories account for nearly all of them. Owner-directed changes are the cleanest: the owner wants something different, and the only questions are price and time. Errors and omissions in the contract documents are the contested ones, because they raise who should have caught it and whether the cost is a betterment the owner would have paid anyway.

Differing site conditions cover what was concealed — rock where soil was assumed, existing conditions that do not match the as-builts on a renovation. External events cover code interpretations at plan review, material discontinuation, and regulatory change. Sorting a claim into the right category usually decides who pays, which is why the categorisation is argued as hard as the number.

It usually begins with a proposal request or an RFI response that reveals a change. The contractor prices it and submits a change order request with a cost breakdown and any time extension claimed. The architect reviews the pricing against the contract’s allowances for overhead and profit, the owner accepts or negotiates, and an executed change order issues.

When the owner needs work to proceed before the price is agreed, the mechanism is a construction change directive: the owner directs the change unilaterally, the work starts, and the cost is determined afterwards — often on a time-and-materials basis until a number is settled. It keeps the job moving and it is the most expensive way to buy anything, so it is reserved for genuine schedule emergencies.

Change order disputes are rarely about whether work happened. They are about entitlement — whether the contract already required it — and about time, whether the change actually delayed the critical path or ran concurrently with something else. Both questions are answered from the record: the RFI that raised the issue, the response that changed the requirement, the daily reports showing when the crew was affected, the schedule updates.

Projects that lose these arguments usually lost them months earlier by not connecting the documents. The RFI response that created the change sits in one system, the cost proposal in another, the schedule impact nowhere. Reconstructing that chain after the fact is expensive, and the reconstruction is what claims consultants are paid to do.