A client asks for one more outlet. The crew is standing right there, saying yes takes four seconds, and nobody writes anything down. Nine times a job, eighteen jobs a year, and a builder has given away a quarter of a million dollars of selling by being agreeable.
In this article
- What an unpriced change actually costs
- Why changes happen, and which ones are yours
- The clause has to exist before the change does
- Pricing a change order properly
- The process at the job site
- When the client pushes back
- A year in numbers
- Preventing the changes that should never have happened
- Five mistakes
- The five numbers
- Frequently asked questions
What an unpriced change actually costs
Nobody sets out to work for free. It happens one agreeable moment at a time — a door swing reversed, a light added where the client happens to be standing, an outlet moved eighteen inches — each one too small to be worth the awkwardness of stopping to price it.
Multiply that by a year. A general contractor doing $2.1 million in volume across eighteen projects, with an average of nine unpriced changes per job at a true cost of $340 each — labor, materials, supervision and the disruption of the sequence:
18 × 9 × $340 = $55,080 of work performed and never invoiced.
At a 24% gross margin, replacing that lost cost through new construction requires roughly $229,500 of additional revenue. A builder gives away a quarter of a million dollars of selling by being agreeable nine times per job.
The unpriced change also does something the invoice never shows: it teaches the client that changes are free. By month three they stop asking whether something costs extra, because experience has told them it does not.
They resent surprise. A change order presented before the work, with a price and a schedule impact, is a builder being professional. The same amount appearing on a final invoice is a builder being sneaky — same money, opposite relationship, and the second version is what generates the disputes.
Why changes happen, and which ones are yours
Change orders come from four places, and separating them is what turns an argument into a conversation.
Client-driven changes. They want something different than what is drawn. Fully billable, and usually the easiest conversation, because the client knows they asked.
Unforeseen conditions. Rock, rot, undersized electrical service, a slab that is not where the drawings show it. Billable when the contract handles concealed conditions properly — and a fight when it does not.
Design and documentation gaps. The drawings did not resolve something. Billable if the contract defines the design responsibility clearly; frequently disputed when it does not.
Your own errors. A missed scope item, an ordering mistake, a measurement that was wrong. Not billable. Absorb it, say so plainly, and move on — the credibility earned by naming your own mistake is what makes the other three categories believable.
Companies that lose change-order arguments usually lose them because they never made these distinctions out loud, so every request arrives as an undifferentiated fight about money.
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The clause has to exist before the change does
A change-order process invented mid-project is a negotiation. Written into the contract and explained at signing, it is a procedure.
Five things belong in the contract:
The definition. Any modification to the scope, materials, quantities or schedule described in the contract documents.
The form. All changes are documented in writing and signed by both parties before the work proceeds. No verbal change is authorized.
The pricing method. Stated in advance, so it is never argued case by case. Either a fixed price per change or cost plus a defined percentage — and if it is cost plus, name the percentage in the contract.
The schedule impact. Each change order states the days added. This one prevents the most damaging dispute in construction, which is a client who approved eleven changes and then blames the builder for a six-week delay.
Concealed conditions. What happens when you open a wall and find something nobody could have seen. Without this clause, every surprise becomes a question of blame.
Walk the client through all five at signing, in three minutes, before anything has gone wrong. Every subsequent change conversation becomes a reference to something already agreed rather than a new demand.
Pricing a change order properly
The most common error is pricing a change at bare cost, or at a thinner markup than the base contract because it feels small.
A change order carries the same markup as the contract, and often more. It consumes the same overhead, the same supervision and the same risk, and it does so less efficiently — out of sequence, in small quantities, with a crew that has to stop what it was doing.
What belongs in the price of a change:
• Direct labor at burdened cost, including the time to stop, reorganize and restart
• Materials at cost plus your standard markup, including the small-quantity penalty — one box of anything costs more than a pallet
• Subcontractor cost plus your markup on it, since you are managing and warranting the work
• Supervision, which is the line most often forgotten and frequently the largest
• Schedule impact in days, stated even when it is zero
• Rework of completed work, priced honestly — moving a rough-in after drywall means demolition, repair, paint and a second inspection
A worked example. The client wants a window moved twenty-four inches after framing is complete:
• Demolition and reframing, 9 burdened hours at $48: $432
• Header modification and materials: $310
• Exterior sheathing, wrap and siding repair: $540
• Electrical relocated by sub: $380
• Interior patch, drywall and paint: $420
• Supervision, 3 hours: $195
• Subtotal cost: $2,277 · markup at 33%: $751
• Change order total: $3,028, schedule impact 2 days
Presented that way, the client can make a real decision. Presented as "moving that window is about three grand," it sounds like a penalty for changing their mind.
The process at the job site
The system fails in the field, not in the office. It fails at the moment a client asks a foreman for something small and the foreman wants to be helpful.
1. Nobody in the field agrees to a change. One sentence, taught to every foreman and rehearsed until it is automatic: "That's absolutely something we can do — let me get you a price and a schedule impact today." Warm, immediate, and not a refusal.
2. It gets priced the same day. Speed protects the relationship and the schedule. A change priced within twenty-four hours is a service; one that takes a week is an obstruction, and the client starts asking the crew directly again.
3. It is presented in writing with three elements. What changes, what it costs, how many days it adds.
4. It is signed before the work starts. A digital signature on a phone is enough. Unsigned means unstarted — and this is the rule that everything else depends on.
5. It is logged against the contract. Contract value, changes to date, revised total, revised completion date. Send the client the running total with every change so the number never surprises anyone at the end.
That last habit prevents the classic ending: a client who approved twenty-three changes and is genuinely shocked that the project cost 14% more than the contract.
When the client pushes back
"That seems like a lot for moving one window." — "I understand. Here is exactly what it takes: reframing, header, exterior repair, the electrician back out, patch and paint, and a second inspection. If it helps, we can leave it where it is — the framing is done and there is no cost to keeping it." Giving them a free way out is what makes the price credible.
"I assumed that was included." — Go back to the scope document, calmly. If it genuinely was ambiguous, split it. If it was clearly excluded, show them the line. Either way, review it together instead of asserting.
"Can't you just do it?" — "I can, and I want the project to end well for both of us. The way it ends badly is if I absorb changes quietly and then have to make it up somewhere you can see. I'd rather price everything openly and have you decide."
"You're delaying my project with paperwork." — "The paperwork takes an hour and it is what keeps your completion date real. Every change adds days, and if we don't record them together, the finish date stops meaning anything."
A year in numbers
A residential general contractor, eighteen projects, before and after implementing a change-order process:
Before:
• Documented change orders: 31 · value $74,300
• Undocumented changes performed: roughly 160 · estimated cost $54,400
• Payment disputes at closeout: 7
• Average delay against contracted completion: 23 days, largely unattributed
• Gross margin, actual: 17.2% against 24% sold
After — contract clause, foreman script, same-day pricing, running log:
• Documented change orders: 147 · value $198,600
• Undocumented changes: ~20 · estimated cost $6,800
• Payment disputes at closeout: 1
• Average delay: 26 days, of which 19 attributed to signed change orders
• Gross margin, actual: 23.1%
Volume of construction barely moved. $124,300 of additional invoiced revenue appeared, almost all of it margin, and six closeout disputes disappeared. The delay got slightly longer and stopped being the builder's fault, because it was documented as it happened.
Client satisfaction went up rather than down, which surprises builders every time. People do not mind paying for what they asked for. They mind finding out about it at the end.
Preventing the changes that should never have happened
Make selections before construction. Tile, fixtures, appliances, paint, hardware — decided and documented before the first day. Selections made mid-project are the largest source of both changes and delay.
Set allowances at realistic numbers. A $4,000 tile allowance on a project where the client's taste obviously runs to $9,000 is a scheduled argument. Take them to the showroom during estimating and set the allowance on what they actually chose.
Investigate before you price. An hour with an inspection camera, a probe in the crawlspace or an opened section of wall converts a future concealed-condition dispute into a priced line item.
Write exclusions explicitly. What is not in the contract matters more than what is. Landscaping restoration, appliance installation, permit expediting, final cleaning — name them.
Hold a pre-construction meeting. Walk the entire scope with the client and the schedule before mobilizing. It routinely surfaces three or four misunderstandings that would each have become a change order or a fight.
Five mistakes
1. Verbal approvals. An unwritten change is a gift you will argue about later.
2. Pricing changes at cost. They carry the same markup as the contract and consume more supervision per dollar than base work.
3. Omitting the schedule impact. Changes cause delay; unrecorded delay becomes your fault.
4. Batching changes to the end. Twelve changes presented at closeout is a dispute. Twelve presented as they happened is a project.
5. Letting foremen say yes. The whole system lives or dies on one rehearsed sentence in the field.
The five numbers
Change orders as a percentage of contract value. Healthy residential work runs 5% to 15%. Near zero means you are giving them away.
Documented versus performed changes. The gap is money you worked for and never billed.
Average time from request to signed change order. Under twenty-four hours keeps the process credible.
Days added by change order versus total delay. The proportion you can attribute is the proportion you can defend.
Closeout disputes per year. The clearest measure of whether the process is working, and it should approach zero.
Charging properly is half of it. Selling enough is the other half.
A tight change-order process protects the margin on the work you already sold. Send us your bid volume and close rate and we will show you what it would take to keep the schedule full at that margin.
Frequently asked questions
What markup should a contractor apply to a change order?
The same as the base contract, and often more. A change consumes the same overhead, supervision and risk, and it does so less efficiently — out of sequence, in small quantities, with a crew that has to stop what it was doing. The price should include direct labor at burdened cost including the time to stop and restart, materials at cost plus your standard markup with the small-quantity penalty, subcontractor cost plus your markup since you manage and warrant that work, supervision, the schedule impact in days even when it is zero, and honest pricing of any rework to completed work. Pricing changes at bare cost, or at a thinner markup because the change feels small, is one of the most common ways construction margin disappears after signing.
What should the change order clause in a construction contract say?
Five things. A definition — any modification to the scope, materials, quantities or schedule in the contract documents. The form — all changes documented in writing and signed by both parties before work proceeds, with no verbal change authorized. The pricing method, stated in advance so it is never argued case by case, either a fixed price or cost plus a named percentage. The schedule impact — each change order states the days it adds, which prevents the damaging dispute where a client approves eleven changes and then blames the builder for a six-week delay. And a concealed conditions clause covering what happens when you open a wall and find something nobody could have seen. Walk the client through all five at signing, before anything has gone wrong.
How should a foreman handle a client asking for extra work on site?
With one rehearsed sentence that is warm and is not a refusal: "That's absolutely something we can do — let me get you a price and a schedule impact today." Nobody in the field agrees to a change, and nobody starts one. The change is then priced the same day, because a change priced within twenty-four hours reads as service while one that takes a week reads as obstruction and sends the client back to asking the crew directly. It is presented in writing with three elements — what changes, what it costs, how many days it adds — signed before work starts, and logged against a running total sent to the client each time. The whole system lives or dies on that one sentence in the field.