Your contractor shows up on a Monday morning and discovers the foundation has a crack that needs repair before framing can start. You authorize the work verbally over the phone. Two weeks later, the invoice arrives for $3,800. You thought it was covered. Your contractor thought you approved it as extra work. This situation happens because the line between change orders and extra work orders is blurred—and that blur costs money.

Why the difference matters on your project

During my 25 years in construction, I have seen more budget overruns caused by loose language around scope than by dishonesty. The contractor is not trying to surprise you. You both simply disagree on whether something was included in the original bid or if it requires separate payment.

A change order is a legal document. It modifies the contract itself. When you sign it, you are acknowledging that the scope has changed and you agree to the new price and timeline. Both you and the contractor have recourse if something goes wrong. An extra work order is vaguer. It might be a formal document your contractor uses. It might be a handwritten note. Either way, it does not carry the same contractual weight as a change order.

The problem is that extra work orders can sit unsigned or unacknowledged. Weeks later, when payment is due, you have no clear record of what you authorized. The contractor assumes the work was approved. You assume it was a mistake or should have been bid differently. No one is being unreasonable. The system just failed.

Understanding a change order

A change order is a written amendment to your contract. It identifies what work is being added, removed, or modified. It states the new cost impact and any timeline adjustment. Both you and the contractor sign it before the work begins (or immediately after, if it was an emergency).

Change orders are the standard way to handle scope changes in professional construction. They protect both sides. If you later dispute the price, you have signed documentation. If the contractor later claims you did not approve the work, the change order proves you did. I have built homes with zero change orders by working with a clear scope from the start, but some change orders are inevitable on any project longer than a few weeks.

Change orders should include a description of the work, the reason for the change, the cost impact, any schedule impact, and the signature line for both owner and contractor. You should review our guide on how to handle change orders without derailing your project to understand how to evaluate them properly.

Understanding an extra work order

An extra work order is a request or instruction to do work that was not in the original scope. It is less formal than a change order. Some contractors use it as a preliminary document before a change order is drafted. Others use it as a standalone record of work authorized verbally.

The problem with extra work orders is inconsistency. There is no standard format or legal standing across the industry. One contractor’s extra work order might be binding in their company’s process. Another contractor’s might be just an internal memo. You cannot assume an extra work order has the same status as a change order.

Extra work orders can also create scope creep without clear pricing. You approve $500 in extra work, but the contractor later bills $750 because they discovered additional issues once they opened the wall. The extra work order did not specify what would happen if conditions changed, so now you are in a negotiation instead of operating from a clear agreement.

Step 1: Establish your contract language before construction starts

The time to define how change orders and extra work will be handled is before the first shovel hits the ground. Your contract should state exactly what process will be used when scope changes arise. This prevents confusion and conflict later.

• Require that all scope changes over a certain dollar amount (for example, $500) must be documented in a signed change order before work begins
• State whether emergency or urgent work can be authorized verbally, and if so, require written documentation within 24 hours
• Define what counts as extra work versus what is the contractor’s responsibility to address (for example, normal site cleanup versus discovering unexpected structural damage)
• Specify that extra work orders are not binding until converted to a formal change order and signed by both parties
• Include a clause stating that if extra work is authorized but not formalized within a set timeframe (for example, 10 days), it will be treated as part of the contractor’s scope at no additional cost
• State who has authority to approve extra work—you or your owner’s representative—so the contractor knows whom to ask

Example: “Any work outside the original scope exceeding $250 must be documented in a written change order signed by the owner and contractor before work begins. Emergency repairs discovered during construction may be authorized verbally by the owner’s representative, but must be documented in writing within 24 hours and converted to a formal change order within 5 business days.”

Step 2: Document every extra work request in real time

When your contractor discovers something unexpected—a pipe that needs rerouting, a structural issue that requires reinforcement, or a building code violation in the existing structure—document it immediately. Do not wait for a formal change order. Take photos, write down the description, and note the date and time.

• Take a photo or video of the issue with a timestamp visible
• Write down what was discovered, why it requires additional work, and when you were notified
• Note whether you authorized work verbally or asked the contractor to provide a proposal first
• Record the date and time, and include the names of people present when the issue was identified
• If work is authorized verbally, send the contractor an email summarizing what you approved and what you expect the cost to be
• Keep this documentation in one organized location so you can reference it when the change order arrives

Example: “Tuesday, March 14, 10:30 AM. GC found water damage in framing above kitchen window during drywall removal. Affects 8 linear feet. Repair requires replacing two studs and treating for mold. Contractor estimates $1,200. I authorized work to proceed pending formal change order. Photo taken and filed.”

Step 3: Request a formal change order within 48 hours of authorizing extra work

Do not let extra work orders linger. The longer the gap between authorization and documentation, the more room there is for misunderstanding. If you have authorized work, ask for a change order immediately.

• Send the contractor a written request for a change order within 24 hours of authorizing the work
• Reference your documentation—the date, time, photos, and your verbal authorization
• State what you expect the change order to include: description of work, cost, and schedule impact
• Give the contractor a deadline to submit the change order (for example, 48 hours later)
• If the contractor provides an estimate that differs significantly from what you discussed, ask why before signing
• Do not approve payment for extra work that has not been formalized in a signed change order

Example: “Per our phone conversation on March 14, please submit a formal change order for the water damage repair above the kitchen window discovered during framing removal. Include the scope description, materials cost, labor cost, and expected completion date. Please send by end of business tomorrow.”

Step 4: Review the change order against your original scope

When the change order arrives, compare it carefully to your original contract and scope. Make sure the work described was not already included in the original bid and that the pricing seems reasonable for the work involved.

• Check your original contract and bid to confirm the work was not already included
• Verify the description matches what you discussed and what you documented
• Ask for a breakdown of costs: materials, labor, equipment, and overhead
• If you received multiple bids, compare the change order price to what other contractors quoted for similar work
• Check whether the change order adjusts the schedule and, if so, whether that impacts your timeline or finances
• Confirm whether the change order is for a one-time cost or an ongoing cost (for example, an allowance for future discovery)
• Do not sign a change order that is vague or that includes work you did not authorize

Example: “The change order states ‘$1,200 for water damage repair,’ but does not break down labor versus materials. I requested a detailed estimate showing the cost of the two studs, mold treatment, and labor hours at the contracted rate. The breakdown revealed the contractor was charging $400 for materials and $800 for labor (12 hours at $65/hour), which matched the original contract rate.”

Step 5: Establish a process for handling discovery and contingencies

Unexpected conditions are the leading cause of change orders on renovation and new construction projects. The best way to manage them is to anticipate them upfront. Work with your contractor and architect to build in a process for handling discoveries without constant delays or disputes.

• Discuss which types of work are expected to have unknowns (excavation, demolition, foundation work) and plan for discovery
• Include a contingency in your budget—typically 10 to 15% of the total construction cost—to cover unexpected conditions
• Establish a threshold: for example, issues under $1,000 will be handled by the contractor at cost, and issues over $1,000 require a change order
• Create a standard process: contractor notifies you, provides photos and description, submits a proposal, you approve or negotiate, work proceeds
• Reserve the right to hire an independent inspector if you dispute the contractor’s assessment of what needs to be done
• Make clear that you will approve repairs for legitimate code violations or safety issues, but the change order must clearly identify why the work is necessary

Example: “During foundation excavation, the contractor discovered 18 cubic yards of rock that required removal with a jackhammer. The original site survey had not indicated this. Cost: $2,100. The contractor provided photos and a geotechnical report explaining why the rock had to be removed. I approved the change order because the discovery was legitimate and the price was reasonable.”

Step 6: Track all change orders in a single log

By the end of a construction project, you may have approved 10, 20, or more change orders. Losing track of them is easy. A simple log keeps you accountable and helps you spot patterns—like a contractor consistently adding charges that should have been in the original bid.

• Create a spreadsheet with columns for: date, description, approved amount, reason (design change, discovery, owner request, code requirement)
• Add a column for the signed change order date so you know which ones are still pending
• Track the cumulative total so you always know how much the project has grown
• Flag any change orders that seem related or that might have been combined (which would reduce administrative burden)
• Note whether each change order includes a schedule impact, and update your expected completion date accordingly
• Review the log monthly with your contractor to confirm all outstanding change orders are in progress toward approval

Example: “By month three, my change order log showed six approved orders totaling $8,400—all from discoveries during demolition and framing. When I reviewed it with my contractor, I realized three of them could have been avoided with a more thorough pre-construction site assessment. We agreed to do a full structural inspection before moving to the next phase.”

What to watch for

• A contractor who refers to verbal approvals as “extra work orders” but never submits formal change orders—this is a way to avoid signed documentation
• Change orders submitted weeks after the work was completed, when you no longer have photos or documentation to verify what was actually done
• A change order that lists multiple unrelated items in a single document—this makes it hard to dispute one item without rejecting the whole change order
• Extra work that keeps growing over time (for example, “the mold is worse than we thought”) without a clear stopping point or maximum cost
• A contractor who pressures you to sign a change order by claiming the work cannot stop mid-process—legitimate work can always be paused while you review
• Extra work orders that do not include any cost estimate, leaving you to dispute the bill later when it arrives

Questions to ask your contractor

Before construction starts, clarify how your contractor will handle scope changes. These questions establish expectations and prevent misunderstandings when extra work arises.

• What is your process for documenting extra work? Do you use an extra work order form, or do you go straight to a change order?
• If I authorize work verbally, how quickly will you provide a formal change order for my signature?
• What dollar amount triggers a change order requirement? Can you do small extras without formal documentation?
• If you discover something unexpected during construction, what is your process for notifying me and getting approval before you start the work?
• Will you provide a detailed cost estimate before starting extra work, or do you bill for it after the fact?
• If a change order grows or changes scope after we sign it, how do we handle the additional work?
• Who on your team has authority to approve extra work orders? Whom should I contact if I have questions?
• Have you ever had a dispute with an owner over extra work orders that were not formalized? What happened?

The bottom line

A change order is a legal amendment to your contract. An extra work order is an informal request or preliminary document that may not have binding status. The difference matters because extra work that is not formalized in a change order can create disputes about whether it was authorized and what it should cost.

Protect yourself by requiring signed change orders for all scope changes before or immediately after work begins. Document everything in real time. Request formal change orders within 48 hours of authorizing extra work. Track every change order in a log so you can see cumulative cost growth and spot patterns. Your contract should clearly state this process before construction starts, so both you and your contractor know the rules.