The electrician quoted $6,200 for the rough-in and panel upgrade. He came in at $8,900.
The difference was real work. Behind one wall there was knob-and-tube wiring that had to be removed before the rough-in could proceed. The panel situation was more complex than the original quote had assumed — the existing bus configuration required an additional circuit, and the inspector flagged a grounding issue that added a half-day of work. None of this was visible during the electrician's initial walkthrough. None of it was his fault.
The owner reviewed the invoice. The additional work was legitimate. He approved it.
He did not charge the client.
Not because he decided not to. Not because he reviewed the original contract and determined the additional cost fell within the contingency. Not because he weighed the client relationship against the recovery conversation and made a deliberate choice.
He did not charge the client because by the time the invoice arrived, the project was in week nine of twelve, the electrician's explanation was technically accurate, and adding $2,700 to the final invoice — for work that had happened three weeks earlier and required reconstruction to explain clearly — was a conversation that got deferred. And then the project closed. And the conversation never happened.
How Sub Quotes Work and Where They Break Down
A subcontractor quote is an estimate, not a contract. It is built on what the sub can see during his own site visit — which is usually a portion of the full scope, completed in 45 minutes, with some conditions visible and some not.
The knob-and-tube was behind drywall. The bus configuration was visible but the full complexity was not clear until the panel was opened. These are not failures of the electrician's estimating process. They are the normal conditions of working inside existing structures where not everything is accessible before work begins.
Every contractor who has worked with subcontractors for more than two years understands this. The quote is a starting point. The final cost is what the work actually requires.
The problem is not the gap between quote and invoice. The problem is what happens to the gap — who absorbs it, by what process, and whether that decision is made explicitly or by default.
The Three Outcomes
When a subcontractor invoices above his original quote, one of three things happens.
The three outcomes:
- Outcome 1 (correct): The overage is identified when the invoice arrives, the original contract is reviewed, the additional work is confirmed to fall outside the original scope, a change order is written, and the client pays the difference.
- Outcome 2 (default): The overage is absorbed by the contractor as cost of doing business. This requires no process. It happens by default when the invoice is approved without a parallel decision about client recovery.
- Outcome 3 (worst): The contractor attempts to add the overage to the final invoice without prior documentation. The conversation is difficult.
The difference between the first outcome and the second is not discipline or intention. It is whether the decision point exists.
Why the Second Outcome Happens by Default
The subcontractor invoice arrives. The owner reads it. The additional work is real. He approves the invoice.
The decision about whether to pass the overage to the client is a separate decision. It requires pulling the original proposal, understanding whether the work falls within the contingency, and either writing a change order or flagging the item for final invoice — with enough detail that the explanation makes sense six weeks later.
"This needs to be addressed at close" competes with everything else that needs to be addressed at close. Some items make it. Some do not.
The $2,700 electrical overage was not forgotten because the owner was careless. It was absorbed because the decision of whether to recover it was made at the wrong moment — after the invoice was approved, under time pressure.
What It Costs Across a Year
A remodeling business doing ten projects per year will typically work with 30 to 50 subcontractors. On roughly one in four sub engagements, the final invoice will exceed the original quote by more than 15%.
The recovery gap by year:
- With structured review: ~60-70% of client-attributable overages recovered
- Without structured review: ~20-30% of client-attributable overages recovered
- $2,000 avg × 12 incidents/year: $10,000-$12,000 annual gap
Not from bad estimating. From the absence of a 10-minute process.
What Contractors Try First
Tighter sub contracts, written change order requirements, larger contingencies. Each helps in a limited way.
Tighter sub contracts run into a practical problem: the sub does not always know additional work is required before he starts. He opens the wall, sees the knob-and-tube, and has to deal with it before proceeding. Most contractors make the pragmatic call to let the sub proceed and sort out the billing later.
Neither approach solves the actual problem, which is the absence of a structured decision point between invoice approval and client billing.
What the Decision Point Looks Like
When a sub invoice arrives above the original quote, one question needs to be answered before approving: does this overage represent work that was in the original scope, or work that was outside it?
If in-scope -- the contractor absorbs it and notes the pricing gap for future estimates.
If outside scope -- the client owes the difference. A brief change order is written at that moment. Not at final invoice. Now, while the work is current and the documentation is straightforward.
The same conversation at the final invoice, about an issue from week six, is harder. Not impossible — but harder, and less likely to result in full recovery.
The Decision That Was Never Made
The electrician's additional work was legitimate. The knob-and-tube had to go. The panel issue was real. The inspector's requirement was non-negotiable.
The client should have paid for it. The original contract did not include it. The additional cost was a direct consequence of conditions not visible during the proposal walkthrough.
The reason she did not pay for it was a 10-minute process that did not exist between "electrician invoice arrives above quote" and "electrician invoice approved." The default, in the absence of that process, was absorption. Every time.
Where else does margin go between estimate and final invoice?
The previous post covers the full picture: correct quotes, projects that still lose margin, and what the breakdown actually looks like.
The Estimate Was Right. So Why Did the Project Lose Margin? →Related
Frequently asked questions
Who pays when a subcontractor invoices above his original quote?
It depends on whether the additional work was within the original scope or outside it. If the sub underpriced work that was always part of the contract, the contractor typically absorbs the difference. If the additional work was caused by conditions not visible or predictable when the original quote was built — a hidden structural issue, an unexpected existing condition, an inspector requirement not anticipated — the cost is legitimately the client's. The determination needs to be made at the moment the invoice arrives, not at final billing, when the context is current and the change order conversation is still straightforward.
How should contractors handle subcontractor invoice overages?
The most effective process reviews each subcontractor invoice against the original quote before approving it. When an overage exists, the review determines whether the additional work falls within the original contract scope or outside it. In-scope overages are absorbed and noted for future estimating. Out-of-scope overages are documented in a brief change order sent to the client close to when the work occurred, before the invoice is approved. This process takes approximately 10 minutes per occurrence and typically recovers 60 to 70 percent of client-attributable overages that would otherwise be absorbed.
How much do subcontractor invoice overages cost contractors per year?
On a remodeling business doing 10 projects per year with 3 to 5 subcontractors per project, client-attributable subcontractor overages that are absorbed rather than recovered typically total $10,000 to $15,000 annually. This figure represents the gap between overages that were legitimately the client's cost and the portion actually recovered — driven by the absence of a structured review process at the moment sub invoices are approved.
Why do contractors absorb subcontractor cost overruns instead of billing the client?
The primary reason is timing. Invoice approval and client billing are separate decisions that happen at different moments, often weeks apart. When a subcontractor invoice is approved without a parallel decision about client recovery, the overage enters the project's cost record without a billing flag. By the time the final invoice is built, the specific circumstances of the overage require reconstruction from memory and documentation that may be weeks old. The recovery conversation becomes harder with distance, and many overages are absorbed by default rather than by decision.