Change orders are where piece rate jobs get tested. The crew is set up for a defined scope, the rate sheet covers the units in the bid, and then the customer asks for something that was not in the original plan. The new work has to get priced, the crew has to get paid for it, and the customer has to agree to the cost. None of that is automatic on a piece rate job.
This article covers three approaches I use depending on what the change order looks like, a worked example, and the contract language that keeps the conversation simple.
My background
My background is in roofing, gutters, soffit and fascia, and the occasional siding job. Most of what I write below is from that lens, though the same logic applies to framing, drywall, painting, and other trades that use piece rate. The trade specifics will differ, but the three options for change order pricing are the same.
The three options
Every change order on a piece rate job ends up using one of three approaches.
Option 1: Add to the existing piece rate
Use this when the change order adds more of the same work the crew is already doing.
Original bid: 30 squares of architectural shingles at $X per square. Change order: customer wants the porch overhang stripped and reroofed too, which adds 4 more squares of the same shingle on the same pitch.
The cleanest answer is to add 4 squares to the work order at the same per-square rate. The crew already knows the rate, the production rhythm is the same, and the math is straightforward. Bill the customer at the original square rate plus materials, with whatever markup the contract specifies.
This option works when:
- The added work is the same scope as the original
- The pitch, material, and access are similar
- The crew is doing the work in the same trip, not coming back
It does not work when the added work is meaningfully harder or different, even if the unit (square, linear foot, board foot) is the same. A 12/12 pitch porch is not the same as a 6/12 main roof, and the rate should not be either. For more on setting per-unit rates, the setting fair piece rates construction article covers the methodology, and the roofing piece rate guide covers the trade-specific version.
Option 2: Bid the change order separately at hourly cost-plus
Use this when the change order is different work that does not fit the existing rate sheet.
Original bid: tear off and reroof a 30 square house. Change order: customer wants the chimney rebuilt because the flashing detail revealed bad mortar.
A chimney rebuild is masonry, not roofing. The piece rate for shingles does not apply. The cleanest answer is to switch to hourly for the chimney work, track the hours separately, pay the crew their hourly rate, and bill the customer at hourly cost plus materials with a stated markup.
This option works when:
- The added work is outside the scope of the original rate sheet
- The work is unpredictable in duration (discovery work, repairs, custom details)
- The crew does not have a per-unit production history for the new task
The crew has to know going in that the change order portion is hourly. Trying to pay piece rate on work that does not fit a unit count produces resentment fast.
Option 3: Hybrid
Use this when most of the change order is the same scope as the original, but a portion of it requires prep, teardown, or custom work that does not fit the unit.
Original bid: reroof a 30 square house. Change order: add 8 squares to a detached garage, but the garage has rotted decking that needs to come off and be replaced before the new roof goes on.
The 8 squares of new roofing get the existing per-square piece rate. The decking replacement gets paid hourly, with the materials billed cost-plus. Two lines on the work order, two pay records, one change order.
This is the most common pattern in practice. Pure unit-count change orders are rare because most additions involve some setup or discovery work that does not match the unit.
Worked example: chimney rebuild on a reroof
Original job:
- 30 squares of architectural shingles
- Tear off and reroof
- Piece rate at $X per square installed
Change order request: rebuild the chimney from the roofline up before the new roof goes on, because the existing brick is failing and the flashing detail will not hold.
Crew side:
- Original 30 squares stay at the per-square piece rate
- Chimney rebuild gets paid hourly at the agreed crew rate
- Hours tracked separately on the timesheet under the change order line
- Pay stub shows piece units and rate for the reroof portion, and hours and rate for the chimney portion
Customer side:
- Original bid amount stays the same
- Change order line: chimney rebuild, time and materials, hourly rate plus 25 percent markup on labor and materials
- Estimated hours and materials provided up front, billed at actuals
- Signed change order before any chimney work starts
Markup math example for the change order:
| Item | Cost | Markup | Bill |
|---|---|---|---|
| Crew hours: 12 hrs at $55 burdened cost | $660 | 25% | $825 |
| Materials: brick, mortar, flashing | $400 | 25% | $500 |
| Total change order | $1,060 | $1,325 |
The crew gets paid $35 per hour cash wage on those 12 hours, which is what their hourly rate is set at. The $55 burdened figure is what it costs me to put them on the roof once payroll taxes, workers comp, and overhead are included. The how to calculate labor burden construction and how to calculate roofing labor costs articles cover where that burdened number comes from.
The 25 percent markup is what gets billed to the customer on top of the burdened cost. Different markets and different risk profiles use different markups. The contract should state which one applies.
Documenting the rate decision so the crew knows
The crew needs to know three things before they start a change order:
- Which option is being used (existing piece rate, hourly, or hybrid)
- What the rate is for any new line items
- How to track the work on the timesheet or work order
In practice, that means the change order document has a short crew-facing section that says: "The chimney rebuild on this change order is hourly at $X per hour. Track those hours under the change order line on the timesheet. The reroof portion stays on the original piece rate."
A line item this clear avoids the most common piece rate change order dispute, which is a crew member asking why a piece of unusual work did not bump their piece earnings, or why the hourly hours did not show up on the pay stub. The common piece rate payroll mistakes article covers the broader version of this issue.
For shops that track hours alongside piece units (which is what FLSA requires anyway, see the do you have to track hours piece rate article), adding an hourly line on a change order is a small adjustment to an existing process. For shops that only track units, the change order is the moment to start tracking hours, because the wage and hour math gets complicated otherwise.
Customer-side: the contract clause that prevents arguments
The biggest change order disputes happen when the original contract is silent on how change orders will be priced. The customer assumes one method, the contractor uses another, and the conversation goes badly.
A short clause in the original contract solves this. Something like:
Change orders to this contract will be priced as follows: (1) work that adds units of the same scope as the original bid will be priced at the per-unit rate stated in the original contract; (2) work outside the original scope will be priced at time and materials, with labor billed at $[hourly rate] per hour and materials billed at cost plus [markup percentage]; (3) all change orders must be agreed in writing before work begins.
That clause does three things:
- It tells the customer that change orders may be priced differently than the original bid
- It defines the methodology in advance so neither side is negotiating from scratch
- It requires written agreement before the work starts, which protects everyone
Different shops will have different clause language. The point is to have the conversation up front, in writing, so the first change order on a job is not the first time anyone is talking about how change orders work. The how to price roofing jobs accurately article covers the broader contract pricing structure, and the bid calculator tool helps with the per-unit rate side of the math.
Things that go wrong without a process
A few of the patterns that show up when change orders are handled ad hoc:
- Crew expects the change order to bump piece earnings, customer was billed hourly, neither figure ties to the other on the books
- Change order verbally agreed, crew does the work, customer disputes the cost a month later
- Change order priced at the original piece rate even though the new work is harder or different, crew margin disappears
- Hours not tracked on the change order portion, overtime calculation breaks at the end of the week
- Materials billed at cost without markup, the change order loses money even though it adds revenue
Every one of these is preventable with a clear method, a written change order, and crew-facing instructions on the work order.
Quick reference
| Change order type | Pricing approach | Crew pay |
|---|---|---|
| More of the same work | Existing piece rate | Same per-unit rate |
| Different work, unpredictable hours | Time and materials, cost-plus markup | Hourly |
| Mostly same work, some prep or repair | Hybrid | Piece rate plus hourly for the off-scope portion |
The decision usually takes about thirty seconds once the methodology is in place. Without it, the same decision can take a phone call, a meeting, and an awkward conversation with the crew at the end of the week.
Closing
Change orders do not have to be the part of a piece rate job that goes sideways. The work is the same as the rest of the job: figure out which option fits, document it in writing, tell the crew, and pay everyone correctly. The contract clause and the work order language are the two pieces of paperwork that turn change order pricing from a recurring fight into a routine task.
Two related reads on the rate-setting side: setting fair piece rates construction and how to price roofing jobs accurately.
If you want a system that handles piece rate units, hourly hours, and change order tracking on the same job without the spreadsheet juggling, you can sign in or start a trial at app.pieceworkpro.com/signin.