Time & Materials Benchmarks
Open-scope service work — the most variable and scope-creep-prone job type in contracting. Median gross margin is 35–40%, the lowest of any service category, and quote-to-invoice variance can be extreme without controls in place.
Key Finding
One job: quoted $2,720, invoiced $57,408 — a 2,011% overrun
This is an extreme case from real contractor data, but it illustrates the structural problem with T&M work: without formal scope controls, every job is a blank check. The customer received no updated scope acknowledgment before work began. Disputes followed. Only 9.6% of T&M quotes are formally sent to customers before work starts — the rest are internal tracking only.
For contractors running $1M+ in T&M annually, uncontrolled scope creep typically absorbs $80K–150K in unbillable overruns per year.
Time & Materials Benchmark Distribution
Percentile ranges from 2,200+ contractors. T&M variance data is among the most eye-opening in field service operations.
| Metric | Bottom Quartile | Median | Top Quartile | Note |
|---|---|---|---|---|
| Gross Margin | < 30% | 35–40% | 45%+ | Lowest margin of all service types |
| Quote-to-Invoice Variance | > 50% over quote | 15–30% over quote | < 10% over quote | Real outlier: +2,011% on a single job |
| Quote Send Rate | < 5% | ~9.6% | 50%+ | % of T&M estimates formally sent to customer |
| Scope Change Approval Rate | < 20% approved in advance | 40–50% | 90%+ approved before work | Written approval before scope additions |
| Average Markup on Materials | < 20% | 25–35% | 40–50% | Materials markup gap is often invisible to owners |
| Unbilled Labor Rate | > 15% of labor hours | 8–12% | < 5% | Travel, wait time, and callbacks unbilled |
What the data tells us
$2,720 diagnostic → $57K repair
A real T&M job from our dataset: initial quote $2,720 (likely a diagnostic or assessment), final invoice $57,408. This isn't a failure — it's how T&M works when repair scope exceeds the initial assessment. The issue: no updated scope acknowledgment was sent to the customer before the larger work began.
Only 9.6% of T&M quotes sent to customers
Across contractors analyzed, just 9.6% of T&M estimates were formally sent to the customer for acknowledgment before work started. The rest were internal tracking only — leaving contractors exposed to disputes on every overrun. Top performers require written approval for scope additions over $500.
35–45% gross margin (lowest of service types)
T&M jobs run the thinnest margins of any service category. Unbilled travel time, parts sourcing inefficiency, and scope that expands without updated pricing all compress margins below what the hourly rate math suggests.
Untracked scope expansion absorbs 8–15% of T&M revenue
Labor and materials added after initial scope without customer sign-off is the single largest margin leak in T&M work. The fix isn't avoiding scope expansion — it's documenting it. Change orders protect both you and the customer.
Frequently Asked Questions
What is a good gross margin for T&M work?
The median gross margin for time and materials jobs is 35–40%, with the top quartile reaching 45%+. This is the lowest margin of any service category. Uncontrolled scope, unbilled travel time, and inadequate materials markup are the primary margin compressors.
How much do T&M jobs typically expand beyond the initial quote?
T&M work expands by nature — a diagnostic or assessment often leads to a much larger repair. The median T&M job runs 15–30% beyond the original estimate. The most extreme case in our data: a $2,720 diagnostic that became a $57K repair. That's not a failure — it's how T&M works. The risk is when the customer isn't informed before the larger scope begins.
Should contractors send formal quotes for T&M work?
Yes. Only 9.6% of T&M estimates are formally sent to customers before work starts — the rest are internal tracking only. Top quartile contractors send formal T&M quotes on 50%+ of jobs and require written customer approval for any scope addition over $500 before work begins. This protects both you and the customer.
What does untracked scope expansion cost T&M contractors?
For contractors running $1M+ in annual T&M revenue, undocumented scope expansion typically absorbs $80K–150K per year in disputed or unbillable work. The fix isn't avoiding scope expansion — it's documenting it. Change orders protect your revenue and your customer relationship.
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