What it means
When running a business, project plans rarely stay identical from start to finish. Clients often request additional features, unexpected site conditions appear, or timelines shift.
A change order protects your business by recording these updates in writing, preventing disputes over unpaid work or delayed deadlines. Without a proper change order process, companies frequently fall into the trap of doing extra work for free.
Employees or contractors might verbally agree to a client request on-site, only to find the client refuses to pay extra later. Documenting the change keeps budgets accurate and ensures cash flow remains predictable.
In practice, when a modification arises, you calculate the cost impact and schedule adjustment. You present this to the client as a change order.
Once both parties sign, it officially amends the original contract and updates your financial forecasts and job costing reports. Tracking change orders helps non-finance managers monitor project profitability.
If a project accumulates too many small unbilled adjustments, profit margins vanish. Proper tracking ensures your revenue accurately reflects the actual effort and materials delivered.
Ordering a custom house is like building a car. If you originally order a standard model but later ask the factory to add a sunroof, you do not expect them to install it for free.
A change order is the official price tag and receipt for that sunroof.
In practice
Real-world examples
Example 1
You run a software agency building an app for a startup, and the client asks to add a user login screen mid-project. You estimate two extra weeks of developer time and issue a change order for $2,000 and a revised delivery date. The client signs it before any coding starts, so the extra $2,000 is invoiced at the next milestone.
Example 2
Your boutique manufacturing firm receives an order for 500 leather bags, and the buyer then requests embossed initials on each item. You draft a change order adding $5 per bag, which is $2,500 in total, to cover the new stamping equipment and labour. The buyer approves it in writing, and your job costing report shows the extra revenue against the extra cost.
Example 3
Your interior design business is renovating a cafe when structural damage is discovered behind a wall, requiring urgent repair. You photograph the damage, obtain a quote from a specialist and issue a change order for $3,500 before proceeding. The cafe owner signs the same day, so the repair does not delay the opening date any further.
Think of it
Ordering a custom house is like building a car. If you originally order a standard model but later ask the factory to add a sunroof, you do not expect them to install it for free. A change order is the official price tag and receipt for that sunroof.
Formula
Calculation
Revised Contract Value = Original Contract Sum + Approved Change Orders
Worked example 1: The original contract is $50,000. Change Order 1 adds $5,000 for extra work and Change Order 2 deducts $1,500 for removed work. Revised Contract Value = $50,000 + $5,000 - $1,500 = $53,500.
Change Order Price = (Direct Costs + Overhead) x (1 + Margin)
Worked example 2: A contractor is asked to add a storage room to a shop fit-out. Materials cost $6,000 and labour is 80 hours at $50 per hour, which is $4,000, so direct costs are $10,000. Overhead at 10% of direct costs adds $1,000, giving a subtotal of $11,000. A 15% margin on that subtotal adds $1,650, so the change order price is $11,000 + $1,650 = $12,650. Pricing only the $10,000 of direct costs would have left the overhead and profit on the extra work unrecovered.Case study
Seen in the real world
This is a fictional, illustrative scenario. GreenBuild Renovations was hired by Apex Retail to fit out a new shop for $100,000, with a completion date of November 1. During week three, Apex requested an upgraded lighting system and an extra storage room, verbally assuring the project manager they would cover the cost. GreenBuild completed the additions, spending an extra $15,000 on materials and labour. When GreenBuild invoiced $115,000 upon completion, Apex refused to pay the extra amount, stating there was no signed agreement for the additional work.
Because GreenBuild failed to issue formal change orders before starting the extra tasks, they absorbed the $15,000 cost. The job had been expected to earn a $12,000 profit, so it ended with a $3,000 loss, which severely damaged their quarterly profit margin. For their next project, GreenBuild instituted a strict policy: no work outside the original contract begins without a signed change order. When a later client asked for a $6,000 upgrade, GreenBuild added a 20% margin of $1,200 and had the $7,200 change order signed before ordering materials. This protected their cash flow and ensured all extra efforts were fully profitable.
Watch out
Common mistakes
- Proceeding with client requests based on verbal conversations without written approval.
- Failing to update project timelines alongside cost adjustments, leading to unrealistic deadlines.
- Forgetting to factor in overhead and margin when pricing the additional work on the change order.
Questions
People also ask
What is the difference between a change order and the original contract?
The original contract sets the baseline scope, cost, and deadline. A change order modifies that baseline for specific additions, removals, or alterations.
Can a client refuse to sign a change order?
Yes. If a client refuses to sign, you are generally not obligated to perform the extra work, and they are not obligated to pay for it.
Who should create the change order?
Usually, the service provider or contractor drafts the change order detailing the cost and time impact, then submits it to the client for approval.