Why Some Change Orders Grow Faster Than the Work 

The most expensive part of some change orders isn’t the work – It’s the math.

And the way that math is structured can cause the final price to grow much faster than the underlying work itself.

Most owners expect a change order to cost more when the scope changes. What surprises many capital project leaders is how much more—and how often the price grows faster than the scope of work itself.

If you’re looking for a broader overview of why change orders occur in construction projects, I covered that here: Contractors and Change Orders: What You Need to Know

The reason usually isn’t hidden labor or inflated materials.

It’s how the change order is structured.

Where Change Orders Start to Grow

Construction change orders are typically built through a layered calculation. Contractors begin with the direct cost of the work and then apply contractual markups for items such as insurance, project management, overhead, and profit. 

Individually, each markup is normal.

But when percentages are applied sequentially, each one builds on the previous subtotal. That compounding effect can increase the final price faster than the underlying trade work.

That’s where the price begins to compound.

For example, a change that begins with $100,000 of direct work can grow substantially once insurance adjustments, project management fees, overhead, and profit are applied sequentially. The math isn’t complicated—but the compounding effect can be easy to miss.

This structure is common in many construction contracts. Experienced owners pay close attention to how these layers are applied and whether the starting cost of the work is clearly supported.

The Other Driver: Schedule Impact 

Another factor that can materially affect the value of a change order is schedule impact.

When a change is assumed to extend the project duration, additional general conditions may be added. These costs can include:

• field supervision
• temporary facilities
• site utilities
• safety personnel
• equipment rentals

On large capital projects, general conditions can represent a significant monthly cost. Even a modest schedule extension can add meaningful dollars to a change order.

But additional work doesn’t always require additional time. Frequently the work can be performed concurrently with other activities or absorbed within the existing construction schedule.

Understanding how the change interacts with the project timeline is essential when evaluating whether time-related costs are warranted.

How Experienced Owners Review Change Orders

Understanding these two drivers—pricing structure and schedule impact—helps explain why some change orders grow faster than the work itself.

Experienced capital project leaders typically step back and evaluate the assumptions behind the proposal.

Clarify the cost of the work.
They isolate the base cost—labor, materials, equipment, and subcontractor pricing. This establishes the foundation of the calculation.

Validate how markups are applied.
They confirm the markup structure follows the contract. The order and method of applying percentages can materially change the final value.

Assess schedule impact.
They determine whether the change actually affects project duration. Not every modification extends the overall schedule.

Looking through these lenses helps reveal how the final number was assembled—and whether it reflects the true cost of implementing the change.

The Bottom Line

Change orders are a normal and expected part of construction.

But the number presented in a change order represents a series of assumptions about scope, pricing structure, and schedule.

Owners who examine those assumptions carefully are far better positioned to ensure the price reflects the cost of the change—not simply the mechanics of the calculation.