Change orders are one of the leading causes of commercial construction budget overruns, but most can be prevented through thorough preconstruction planning, complete documentation, and clear contractor communication before work begins.

Why Change Orders Matter to Your Bottom Line

Change orders occur when the scope, materials, or conditions of a construction project shift after the contract is signed. According to industry data from the Construction Industry Institute, unplanned change orders can increase total project costs by 10% to 15% on average, and in complex commercial builds, that figure can reach 20% or more.

For commercial developers and fuel station operators in Idaho and the Treasure Valley, even a modest 10% cost increase on a $1.5 million project translates to $150,000 in unplanned spending. Understanding what drives change orders — and how to prevent them — is essential for any owner managing a commercial construction budget.

How Change Orders Are Generated on Commercial Projects

Change orders typically originate from four sources: incomplete design documents, unforeseen site conditions, owner-requested scope modifications, and regulatory changes discovered mid-project. Incomplete drawings are the most common cause, especially when a project moves to bid before the design team has fully coordinated structural, mechanical, and civil plans.

Unforeseen site conditions — such as undocumented underground utilities, unstable soil, or environmental contamination — are particularly common in older commercial areas across the Pacific Northwest. Fuel station redevelopment projects, for example, frequently encounter legacy tank infrastructure or soil contamination that was not identified during due diligence, which can generate significant change orders once excavation begins.

Owner-initiated changes, such as modifying store layouts, adding canopy lighting upgrades, or changing fuel dispenser configurations after construction starts, are also a major driver. These changes may seem minor but can require rework, material reorders, and schedule extensions that compound costs quickly.

Key Considerations for Reducing Change Order Risk

The most effective strategy for limiting change orders is investing in thorough preconstruction services before a shovel enters the ground. This includes completing a full geotechnical investigation, coordinating all design disciplines before issuing bid documents, and conducting a detailed constructability review with the general contractor.

Owners should require 100% construction documents — not design development drawings — before soliciting bids. Projects bid on incomplete documents almost always generate change orders because contractors are forced to make assumptions to fill gaps in the design. Those assumptions rarely match what the owner intended or what field conditions require.

A practical tip: require your contractor to submit a formal Request for Information (RFI) log at every progress meeting. Tracking RFIs in real time helps identify recurring ambiguities in the drawings before they become costly change orders. Projects with active RFI management typically see fewer disputes and more predictable final costs.

Regulatory changes mid-project can also generate unexpected costs, particularly in Idaho counties and municipalities that are updating zoning codes, stormwater requirements, or fire marshal standards. Engaging early with local building departments in jurisdictions like Ada County or Canyon County can surface pending regulatory changes before they disrupt a project already under construction.

Contract language also plays a significant role. Owners should ensure their construction agreement includes a clearly defined change order process with required written authorization, a specified markup cap for contractor overhead and profit on changes (typically 10% to 15%), and a time limit for submitting change order requests after a triggering event occurs.

Key Takeaway

Change orders are not inevitable. Most originate from preventable causes — incomplete documents, skipped site investigations, and poor pre-bid coordination. Commercial project owners who invest in preconstruction planning, require complete construction documents before bidding, and establish clear change order protocols in their contracts consistently experience fewer surprises and more predictable project outcomes.

For Idaho and Pacific Northwest developers managing fuel stations, retail developments, or commercial facilities, understanding how to structure a project from the front end is the most reliable way to protect the budget from the back end. Detailed information on preconstruction planning approaches is available through PNC’s commercial construction services, and project-specific guidance can be explored through the PNC project inquiry page. Additional context on regional commercial construction practices is outlined on the Pacific North Contractors homepage.

Pacific North Contractors brings over 25 years of commercial construction expertise to Idaho and the Pacific Northwest, specializing in fuel stations, retail, and commercial development.

Frequently Asked Questions

What is the average cost impact of change orders on a commercial construction project?

Industry research from the Construction Industry Institute indicates that change orders typically add 10% to 15% to the final cost of a commercial project. On complex builds or projects with incomplete design documents, that figure can exceed 20%. For a $2 million commercial project, that represents $200,000 to $400,000 in unplanned costs that were not included in the original budget.

What is the most common cause of change orders in commercial construction?

Incomplete or poorly coordinated design documents are the most frequently cited cause of construction change orders. When structural, mechanical, electrical, and civil drawings are not fully coordinated before bidding, contractors encounter conflicts in the field that require design resolution, additional materials, and rework — all of which generate change orders.

Can unforeseen site conditions always be avoided through due diligence?

Not entirely, but the risk can be significantly reduced. Conducting a geotechnical investigation, reviewing environmental records, locating all underground utilities, and performing a phase one environmental site assessment before finalizing project documents substantially lowers the likelihood of costly surprises. Fuel station sites and older commercial parcels in the Treasure Valley and broader Pacific Northwest are particularly prone to undocumented underground conditions.

How should a commercial owner respond when a contractor submits a change order?

Owners should review every change order against the original contract drawings and specifications before approving it. The change order should include a detailed cost breakdown showing labor, materials, equipment, and the contractor’s markup. If the change involves work that was reasonably implied by the original contract documents, the owner may have grounds to dispute the change order. Timely written review is important because most contracts include deadlines for owner response.

What contract provisions help limit change order exposure on commercial projects?

Key contract provisions include a clearly defined change order authorization process requiring written approval before work proceeds, a markup cap on contractor overhead and profit for changes (commonly set at 10% to 15%), a deadline for the contractor to submit change order requests after a triggering event, and a defined process for handling disputes. Owners working on fuel station or retail projects in Idaho should also ensure their contracts address regulatory change scenarios, given that local jurisdictions may update code requirements during a project’s construction window.