Few phrases make a commercial property owner’s stomach drop quite like “We need to talk about a change order.” For many owners, those words are synonymous with budget overruns, schedule slippage, and the uncomfortable feeling of being at a disadvantage in a conversation with their contractor.
The reality is more nuanced. Change orders in construction are common, sometimes unavoidable, and not always a sign that something has gone wrong. But they can absolutely become a source of high cost and conflict when they’re not well understood, well managed, or well anticipated.
This guide explains what commercial construction change orders are, why they happen, how to evaluate one when it lands on your desk, and most importantly, what you can do before a project starts to minimize a change order.
What Is a Construction Change Order?
A change order is a formal written modification to an existing construction contract. It documents a change to the original scope of work, and it does one or more of three things: adds cost to the contract, reduces cost from the contract, or adjusts the project schedule, or some combination of all three.
Change orders in construction are legally binding documents. Once both parties (the owner and the contractor) sign a change order, it becomes part of the contract. That’s why the process matters: no work should proceed on a change, and no additional cost should be incurred, until a change order is signed by both parties.
⚠️ A word of caution: Never authorize additional work verbally. “That’s fine, just do it” spoken on a job site is not a binding agreement and creates serious risk for the owner. If your contractor asks for approval to proceed with out-of-scope work, require a written change order with a firm cost and schedule impact before giving the green light.
Why Do Change Orders Happen?
Understanding the root causes of commercial construction change orders helps owners separate the inevitable from the preventable, and recognize when a change order is reasonable versus when it warrants pushback.
- Owner-initiated changes. The most straightforward category. The owner decides mid-project to modify the design, change a material specification, add a feature, or expand the scope. These are voluntary changes that are entirely within the owner’s control. They’re also among the most expensive, because changing direction after construction has begun disrupts labor schedules, delays material orders, and may require rework. Decisions made during design cost a fraction of what the same decision costs during construction.
- Unforeseen site conditions. No matter how thorough the pre-construction investigation, some site conditions can’t be fully known until work begins. Demolition reveals unexpected structural issues. Excavation uncovers buried utilities, rock, or contaminated soil that weren’t identified in the geotechnical report. In renovation projects, opening walls exposes outdated wiring, asbestos, or plumbing that doesn’t meet current code. These discoveries are genuinely unforeseeable and typically result in legitimate change orders.
- Design errors or omissions. Construction documents are complex, and no set of drawings is perfect. When a dimension is missing, systems conflict with each other, or a specification is ambiguous, the contractor encounters a condition in the field that the drawings don’t address. How these situations are handled, and who bears the cost, depends on the contract and the relationship between the designer and contractor.
- Code and regulatory changes. If a permit review requires modifications to the design, or if an inspection reveals a code compliance issue that wasn’t anticipated, the required corrections typically become change orders. These are generally unavoidable, though thorough code review during design reduces their frequency.
- Scope gaps in the original contract. Sometimes change orders arise not because the project changed, but because the original contract didn’t clearly define what was included. Vague scope language (for example, “install new flooring as needed” rather than specifying type, area, and material grade) creates openings for disputes over what was and wasn’t part of the base contract.
How to Evaluate a Change Order Before You Sign
When a change order lands on your desk, slow down. You are under no obligation to sign immediately, and a contractor who pressures you to do so without adequate explanation is a red flag. Here’s what to review:
| Review this | Ask yourself |
| Scope description | Is the work clearly described? Does it match what was discussed verbally? |
| Cost breakdown | Are labor, materials, and markup itemized separately? Does the total seem proportionate to the work? |
| Schedule impact | Does this change add days to the project? Is the added time justified? |
| Cause of the change | Was this triggered by your decision, an unforeseen condition, or a design issue? The cause affects who should bear the cost. |
| Contract language | Does your original contract address how change orders are priced and approved? Follow that process. |
| Timing | Is the contractor asking for approval before work begins, or after? Always before — never after. |
If something doesn’t add up, ask for clarification before signing. A legitimate contractor will welcome the conversation. If the explanation doesn’t satisfy your questions, it’s reasonable to request a second opinion on pricing from another qualified source.
How to Minimize Change Orders Before Your Project Starts
The most effective change order strategy is prevention, and prevention happens almost entirely before construction begins. The decisions made during pre-construction planning have more influence over a project’s final cost than any other factor. Here’s where to focus:
Invest in thorough pre-construction services. A comprehensive pre-construction phase (site analysis, geotechnical investigation, detailed scope development, and constructability review) surfaces the conditions and questions that become change orders if left unaddressed. Every hour spent in pre-construction is worth many hours of change order management later.
Demand complete construction documents. Incomplete or poorly coordinated drawings are among the leading causes of change orders in construction. Before a project goes to permit or bid, have your contractor review the construction documents for conflicts, gaps, and ambiguities. In a design-build arrangement, this review happens as part of the process: the contractor’s field knowledge is applied to the design before it’s finalized.
Define scope precisely in the contract. General descriptions leave room for disagreement. Specify materials by type and grade, define work areas clearly, and document any allowances explicitly. If a decision isn’t made at contract time (a flooring selection, for example), establish the allowance value in writing and understand that changes from that allowance will generate a change order.
Make decisions early and stick to them. Owner-initiated changes are the most controllable category of change orders in construction, and among the most expensive. The earlier in the process a decision is made, the lower the cost of making it. A flooring change decided during design is free. The same change decided after subfloor installation has been completed may require rework, restocking fees, reordering, and schedule impact.
Build a contingency into your budget. Even with the best pre-construction planning, some change orders are unavoidable. A realistic contingency (typically five to ten percent of the contract value depending on project type and site conditions) means that when legitimate change orders do arise, they don’t derail the project financially. An owner who has no contingency is an owner who is always negotiating from a position of panic.
How CBF Contracting Approaches Change Orders
At CBF Contracting, our goal on every project is to complete the work we contracted to do at the price we agreed to. Full stop. That means doing the pre-construction work to surface potential issues before they become field surprises, writing contracts with clear scope definitions, and communicating proactively when conditions arise that could affect cost or schedule.
When a legitimate change order is necessary, we document it clearly, price it transparently, and present it to the owner before proceeding. Never after. Our clients know exactly what they’re signing and why. That’s not just good practice. It’s the only way to build the kind of long-term relationships we’ve built with clients across Western Pennsylvania, Eastern Ohio, and Western New York for over four decades.
The Bottom Line
Change orders in construction aren’t inherently bad. They’re a mechanism for managing the reality that complex projects rarely go exactly as initially planned. What matters is how they’re handled: whether they’re communicated proactively, priced fairly, documented properly, and minimized through thorough planning up front. An owner who understands the process is an owner who stays in control of their project and their budget.
