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 of residential service mix; still beats commercial install (10–15%) |
| 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.
The CLEAR Framework for Contractors
Learn moreEvery contractor runs on five financial pillars. Here is what we evaluate in each.
DSO, invoice speed, retainage, progress billing. The gap between completing work and collecting payment is where most contractors bleed cash.
Technician utilization, billable hours, callback rates. A 10-person crew at 60% utilization wastes the equivalent of 4 full-time techs every day.
Job-level margins, service agreement profitability, install vs service mix. Most contractors know their total margin but not which jobs are underwater.
Quote conversion rate, pull-through revenue, customer retention. The best contractors generate 2-4x more repair revenue from SA customers than non-SA.
Customer concentration, warranty exposure, bonding capacity. A single customer above 20% of revenue is one lost contract away from a cash crisis.
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%+. T&M typically lands below packaged residential service work (45–55%) and well below maintenance/SA work in dollar terms — uncontrolled scope, unbilled travel time, and inadequate materials markup are the primary margin compressors. T&M still beats commercial install work (10–15%), but it's the most leak-prone of the residential service mix.
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.
From clients
What contractors say after working with us.
“Thought we were running 22% net. Real number was 11 once Sam allocated overhead correctly across labor and materials. Painful conversation but I needed it. We've been repricing every job since.”
“We had 40 service contracts and no idea which ones actually made money once you included drive time and callbacks. Sam ran the analysis — three of our biggest were underwater. Repriced or dropped them, net margin went from 8% to 14% in one quarter.”
“My CPA is great at taxes but nobody was looking at the actual business. Sam found $140K in overhead we were eating on service calls because our flat rates were 3 years out of date. Repriced the menu in 30 days. The pricing fix alone covers his fee for years.”
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