Construction Change Orders: The Complete Guide

Change is inevitable on a construction project — designs evolve, conditions surprise, owners want something different. The change order is how those changes are formally agreed and paid for. Handled well, change orders keep a project fair and on track. Handled poorly, they're where contractors lose money and relationships sour. This complete guide covers what a change order is, what causes them, the process, and how documentation decides whether you actually get paid.

This article is general information, not legal advice. Your contract governs how changes must be handled; consult a construction attorney on a specific dispute.

What is a change order?

A change order is a formal, written agreement that modifies the original construction contract — changing the scope of work, the price, the schedule, or all three. It documents a change from what was originally agreed and, once signed by the appropriate parties, becomes part of the contract. Change orders can add work, remove work, or substitute one approach for another, with a corresponding adjustment to cost and time.

What causes change orders

Change orders come from several common sources:

Design changes. The owner or architect modifies the design after the contract is signed.

Unforeseen conditions. Something discovered during the work that wasn't anticipated — unexpected soil conditions, hidden utilities, existing structures that differ from the plans.

Errors or omissions. Gaps or conflicts in the drawings and specs that require added or corrected work.

Owner requests. The owner decides they want something different or additional.

Regulatory changes. New code interpretations or requirements from the authority.

RFI outcomes. An RFI answer that reveals a change is needed.

The change-order process

While contracts vary, the typical flow is:

1. A change is identified. Someone recognizes that work differs from the contract — often flagged via an RFI or a field condition.
2. The change is priced. The contractor prepares the cost and schedule impact of the change.
3. A change order proposal is submitted. The proposed change, with pricing and time impact, goes to the owner.
4. Review and negotiation. The parties review and negotiate the price and terms.
5. Approval and signature. Once agreed, the change order is signed and becomes part of the contract.
6. Execution. The work proceeds under the agreed change.

Why documentation decides who gets paid

Here's the hard truth of change orders: the work often has to happen before the paperwork catches up, and that's where contractors lose money. An owner directs a change verbally to keep the job moving; the contractor does the work; and later the price is disputed or the change is denied because there's no record it was authorized.

The protection is documentation. When a change is directed — especially verbally — record it immediately: the date, who directed it, exactly what was asked, and the work performed, with photos. This same-day record isn't a substitute for a signed change order, but it's powerful evidence that the change was directed and the work was done, which is often what gets a disputed change paid. Contractors who document directed changes on the day consistently get paid for far more of their extra work.

The verbal-change trap

The most expensive change-order mistake is doing directed work on a verbal instruction and trusting it'll be sorted later. Later, memories differ or personnel change, and an undocumented verbal direction becomes your word against the owner's. Always follow your contract's change process — but back every directed change with same-day field documentation as insurance.

Documenting changes as they happen

The field record of a change — the direction, the extra work, the photos — is what turns a contested change into a paid one, and it belongs in your daily documentation.

BuildLog helps you capture directed changes the moment they happen: log the verbal instruction with a timestamp and who gave it, record the extra labor, equipment, and materials the change consumed, and attach photos of the changed work — all in your daily report, dated and searchable. When you go to price and submit the change order, the field record is already there to back it. It works offline and exports branded PDFs, with a free tier to start.

Frequently asked questions

What is a construction change order? A written, signed modification to the construction contract that changes the scope, price, or schedule of the work and becomes part of the contract once agreed.

What causes change orders? Design changes, unforeseen conditions, errors or omissions in the documents, owner requests, regulatory changes, and RFI outcomes.

How do I make sure I get paid for a change? Follow your contract's change process, and document every directed change the same day — the instruction, who gave it, the work done, and photos — so a disputed change has a contemporaneous record behind it.

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Document directed changes on the day. Try BuildLog free.