Your contractor says the project cost jumped by $85,000 due to "unforeseen conditions," but you never approved it. Change orders are how scope creep becomes your problem—unless you understand how to manage them. This guide walks you through what they are, why they happen, and how to protect your budget on commercial construction projects.
What Is a Change Order?
A change order is a written document that modifies the original construction contract. It details what's changing, why, the cost impact, and any timeline adjustments. Without a signed change order, there's no legal protection for either you or the contractor—which is why it's the most important document you'll handle after the initial contract.
In commercial construction, change orders aren't optional paperwork. They're the only mechanism that keeps the project scope, cost, and schedule aligned when conditions shift.
Common Reasons Change Orders Get Issued
Not every change order means someone miscalculated. Here's what typically triggers them:
- Site conditions: Discovering underground utilities, contaminated soil, or structural issues once work begins
- Design changes: Owner requests (e.g., upgrading HVAC systems or relocating a wall)
- Code compliance: New interpretations from building inspectors or updated regulations
- Material delays or price spikes: Supply chain disruptions affecting labor-intensive workarounds
- Hidden damage: Water intrusion, asbestos, or deteriorated structural elements only visible during demolition
The source matters. Owner-initiated changes and design errors are typically paid by you. Contractor oversights or site prep mistakes may fall under their responsibility, depending on contract language.
How to Review a Change Order
When your contractor submits one, don't rubber-stamp it. Take these specific steps:
Request a detailed breakdown. A $50,000 change order needs itemization: labor hours × hourly rate, material costs with quotes, equipment rental, and contingency percentage. Vague totals are red flags.
Verify the scope. Confirm the work described actually addresses the problem. A contractor claiming they need 200 extra labor hours to install additional electrical outlets should trigger questions.
Check pricing against the original contract. Compare labor rates and markups. If the base contract specifies a 15% overhead but the change order jumps to 25%, negotiate.
Request supporting documentation. Photos of the issue, engineer reports, supplier quotes for materials, and crew timesheets provide evidence. Reputable contractors provide these without hesitation.
Review the timeline impact. Does this work extend the project by 10 days or 4 weeks? That affects your occupancy date and may trigger additional costs (temporary facilities, staging, staffing overlaps).
Negotiating and Approving
You have leverage, especially early in the project. If a change order seems high:
- Get a second opinion from your project manager or a construction consultant (costs $150–300/hour but prevents expensive mistakes)
- Request the contractor re-bid the work with cost-saving alternatives
- Ask if the work can be phased or postponed to a maintenance contract later
- Negotiate the contingency percentage (10% is standard; 15% suggests uncertainty)
Once you agree on scope and cost, sign and date both copies. Verbal approvals don't hold up legally. Your contractor needs written authorization to proceed; you need documentation of what you approved and what you'll pay.
Cost Impact: What You Should Expect
On a $2 million commercial build, expect 3–5% in change orders ($60,000–$100,000) for typical projects. Older buildings undergoing renovation see 5–10% because hidden conditions are common. A $50,000 change order on a $1.5 million project is normal; a $300,000 order suggests either a major scope shift or poor initial planning.
If change orders exceed 10% of the original contract value, pause and reassess. Excess changes indicate the project wasn't properly estimated or designed upfront.
Red Flags to Watch
- A change order requesting payment before work is complete
- Vague descriptions ("miscellaneous adjustments" instead of specific line items)
- Contractors pressuring quick approval or threatening work stoppage
- Markup percentages that differ significantly from the original contract
- No supporting documentation or quotes
Frequently Asked Questions
Q: Can I refuse to pay a change order once work is already done? Once work is complete and incorporated into the building, refusal becomes complicated and costly (litigation, project disputes). Always approve in writing before work begins.
Q: What if the contractor won't provide an itemized breakdown? Request it in writing. Most reputable firms provide detailed quotes as standard practice. Reluctance is a warning sign to escalate concerns with your project manager or legal counsel.
Q: How do I reduce change orders on future projects? Invest in thorough site investigations, detailed design documents, and contingency budgets (10–15%) built into the original contract. This front-loads costs but prevents surprises.
Ready to move forward? Mercoly helps you find, compare, and hire trusted commercial construction contractors who maintain transparent change order processes and deliver on budget.