The Change Order Pricing Formula Every GC Should Know by Heart

Why Your Change Order Pricing Breaks Down Before You Submit It

Most change order disputes do not start with a disagreement over whether the work happened. They start because the GC submitted a number without showing the math. The owner or architect pushes back, the GC scrambles to reconstruct the cost, and time turns a fair markup into a negotiated loss.

The fix is a consistent pricing formula, applied the same way on every job, every time. This article walks through that formula component by component: labor, materials, equipment, and markup. It also covers how to stack those components correctly so your final number is defensible when a project architect calls you to negotiate.

The Four-Component Framework

Every change order cost breaks into four buckets. Some changes will not have all four, but you should always think through each one before you submit pricing. Missing a bucket on a $40,000 change order is how you leave $6,000 on the table.

• Labor (wages, burden, supervision)
• Materials (installed materials, consumables, small tools)
• Equipment (owned or rented)
• Markup (overhead and profit applied to the subtotal of the above)

Build each component as its own line item. When you roll them up, both you and the owner can see exactly where the number came from.

Component 1: Labor

Labor is where GCs most often under-price change orders. The mistake is pricing only the base wage rate. The correct figure is the fully burdened labor rate, which includes every dollar the employer actually spends per hour of work.

What Goes into Burdened Labor

• Base hourly wage
• FICA (Social Security and Medicare, currently 7.65% of gross wages up to applicable wage bases)
• Federal and state unemployment insurance (FUTA/SUTA)
• Workers compensation insurance (varies dramatically by trade and state; 15% to 35% of payroll is common in high-hazard classifications)
• General liability insurance allocated to labor
• Fringe benefits: health insurance, paid leave, retirement contributions
• Union fringes, if applicable (health and welfare, pension, annuity, training fund)

On a union carpenter earning $45.00/hr base in many metro markets, the fully burdened cost routinely runs $75 to $90/hr once you add fringes and payroll burden. Price the change order at $45 and you are paying the owner to do his extra work.

Supervisor Time

If a foreman spends two hours pricing the change, managing the crew, and coordinating material delivery, that time is a real cost. Include it at the foreman's burdened rate. Many contracts allow this; check your subcontract and prime contract language before submitting.

Component 2: Materials

Material pricing seems straightforward until you forget line items that are real costs on every job.

Build Your Material Cost From Invoices and Quotes

Use actual supplier quotes or invoices whenever possible. For smaller or faster changes, use current price book rates. Either way, document the source. An owner questioning a $1,800 material line will back off immediately when you attach the distributor quote.

Do Not Forget These Material-Related Costs

• Sales tax. It adds 6% to 10% depending on the state. On $20,000 of materials, that is $1,200 to $2,000. It is a real cost. Price it in.
• Delivery and freight. If a supplier charges a delivery fee or you are paying a driver to pick up materials, that is a cost of the change.
• Consumables. Wire nuts, screws, fasteners, saw blades, drill bits, tape, backing material. These are real costs that rarely show up on a quote. Build in a reasonable consumables allowance, typically 2% to 5% of direct material cost depending on trade.
• Material waste and cut-off. Structural steel gets cut. Drywall gets notched. Pipe gets trimmed. Price for the material you order, not just what you install.

Component 3: Equipment

Equipment cost gets dropped more often than any other component on change order pricing sheets. If the change requires a piece of equipment, that cost belongs in the pricing, full stop.

Rented Equipment

Use the actual rental invoice or rental house quote. Include fuel, delivery charges, and any environmental or damage waiver fees the rental company charges. A 40-ft boom lift renting for $650/day with $120 in delivery each way adds over $1,400 to a two-day change, before fuel.

Owned Equipment

Just because you own the equipment does not mean it is free. Price it at an ownership and operating rate. The AED Green Book and FHWA equipment rates are two widely accepted references. A common shorthand is to use 75% to 80% of the local rental rate for owned equipment, which captures depreciation, insurance, maintenance, and capital cost without over-charging.

Small Tools

Small tools (hand tools, cordless drills, levels, etc.) are typically covered as a percentage of labor rather than priced individually. A rate of 3% to 5% of direct labor cost is defensible on most jobs.

Component 4: Markup

Markup is the last layer, applied to the subtotal of labor, materials, and equipment. It has two parts: overhead recovery and profit.

Overhead

Your overhead rate should reflect your actual G&A cost as a percentage of direct project cost. Most small-to-mid GCs run overhead between 10% and 18% of direct cost. If you do not know your exact overhead rate, talk to your accountant or controller. Guessing too low means every change order you win contributes less than a dollar toward covering your office, your insurance, and your staff.

Profit

Profit on change orders is typically higher than on the base contract, and rightly so. Change orders are disruptive. They interrupt planned workflow, require expedited procurement, and often carry schedule risk. A standard range is 5% to 15% on the cost subtotal, with many GCs landing at 10% on normal changes and pushing toward 15% on complex or time-sensitive ones.

Stacking the Formula

Apply markup to the direct cost subtotal, not to individual components. The correct structure looks like this:

• Labor (burdened): $8,400
• Materials (with tax and freight): $6,200
• Equipment: $1,300
• Small tools (4% of labor): $336
• Direct Cost Subtotal: $16,236
• Overhead (12%): $1,948
• Profit (10%): $1,624
• Total Change Order Amount: $19,808

Some contracts specify markup caps. General Services Administration (GSA) contracts, for example, often cap combined overhead and profit at 15%. Public work in many states sets similar limits. Know what your contract allows before you submit.

Documenting Your Pricing for Submission

A well-priced change order means nothing if the documentation does not back it up. Attach the following to every change order submission:

• A line-by-line cost breakdown organized by the four components above
• Labor: hours by trade classification, burdened rate used, and source of that rate
• Materials: supplier quotes or invoices, with quantities and unit prices itemized
• Equipment: rental quote or owned-equipment rate sheet with the source cited
• A brief written description tying the cost back to the scope of the change

Keep a copy of every submission and every response. If a change order goes unsigned and you proceed at the owner's direction, that paper trail is how you get paid when the job closes.

One Formula, Used Consistently

The GCs who price change orders well are not doing anything exotic. They have a template, they apply it consistently, and they document the inputs. That consistency protects margin on small changes and makes large ones much easier to defend. It also shortens the approval cycle because architects and owners learn to trust your pricing when it shows up the same way every time.

Tracking change orders across projects does not have to live in spreadsheets. EZBilling ties them directly to your schedule of values and pay applications, so approved changes flow into your next billing without manual re-entry.