How to Choose Between Time and Materials and Flat Rate

Why This Matters

The pricing model you choose directly determines your gross margin, close rate, average ticket, and technician stress level. Shops on flat rate average 58 percent gross margin and $742 average ticket. Shops on T&M average 42 percent gross margin and $418 average ticket. That 16 point margin gap on a $1M shop is $160,000 in gross profit per year, which is typically the difference between breaking even and paying the owner $120,000 in salary. The decision also affects tech retention. Techs hate writing detailed labor time sheets and justifying every minute to skeptical customers, which is exactly what T&M requires. Flat rate removes that friction and lets techs focus on the work. The wrong choice for your specific business context, however, can tank a shop. Commercial accounts on fixed facilities budgets often require T&M or unit pricing. New construction work is often best on T&M. Knowing the difference matters.

The Steps

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   Step 1: Understand what T&M actually looks like in practice

   Time and materials means the customer pays for actual hours worked plus actual parts cost plus a markup. A typical T&M rate is $135 per hour for labor plus parts at 25 to 40 percent markup over wholesale. On a capacitor replacement that takes 30 minutes and uses an $18 part, the customer sees: 0.5 hours at $135 equals $67.50, plus $18 part with 30 percent markup equals $23.40, total $90.90. The customer feels good because the invoice looks fair and detailed. The shop feels bad because the $90.90 invoice covers labor and parts cost of roughly $65 and nets barely $26 before overhead. That is how T&M shops end up at 42 percent gross margin.

   Pro tip: Always do the full cost math on a T&M invoice including overhead. The numbers rarely work.

2. 2

   Step 2: Understand what flat rate actually looks like in practice

   Flat rate means the customer pays a predetermined price for a specific repair, regardless of actual time or parts. On the same capacitor replacement, the flat rate price is $219. The customer sees a single line item with a 1 year warranty and pays without parsing the math. The shop makes $219 on the same $65 cost, netting $154 per call, which is $128 more than the T&M version. Across 1,000 service calls a year, that is $128,000 in additional gross profit from the same techs doing the same work. The customer is not worse off because she got a fair price for the service and a warranty she does not get on T&M.

   Pro tip: The flat rate advantage is massive on quick repairs. The math shifts on long complex jobs.

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   Step 3: Identify when T&M is actually the right choice

   T&M is the right choice in three scenarios. First, commercial accounts with procurement teams that require detailed invoicing and fixed rate agreements. Second, new construction rough in work where scope changes constantly and flat rate pricing is impractical. Third, specialty or high complexity repairs where the scope cannot be determined in advance, such as some industrial or custom work. If 80 percent of your work is residential repair and 20 percent is commercial, you can run flat rate on residential and T&M on commercial without confusion. Do not force flat rate onto work where it genuinely does not fit.

   Pro tip: Never run T&M on residential repair unless you enjoy losing money.

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   Step 4: Calculate the switching cost

   If you are currently on T&M and considering flat rate, calculate the one time switching cost. You need to build a flat rate price book (150 to 300 line items at $0 to $800 for a consultant or 20 hours of owner time), train every tech on the new book (10 hours of training time), and communicate the change to existing customers (minimal effort). Total switching cost is typically 30 to 50 hours of owner and senior tech time plus $800 if you hire help. Compared to the $128,000 annual profit lift on a typical 1,000 call shop, the ROI is absurd. Most shops recover the switching cost in the first 2 weeks of operation.

   Pro tip: Build your own price book from your own cost data. Off the shelf books miss your local labor rates.

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   Step 5: Run a controlled test on a subset of jobs

   If you are nervous about switching, run a 30 day test with flat rate on one service category while keeping T&M on the rest. Typical first category is capacitor replacements or drain cleanings because they are high frequency, repeatable, and low risk. Track close rate, average ticket, and customer satisfaction on the test category versus the same category last month. Most shops see close rate hold steady and average ticket jump 15 to 25 percent in the first 30 days. That data gives you the confidence to roll flat rate out to the rest of the price book.

   Pro tip: Test on a category where you have 30+ jobs per month for statistically meaningful data.

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   Step 6: Consider the hybrid model

   Some shops run a hybrid: flat rate for residential repairs under $1,500 and T&M for everything larger or more complex. The logic is that small residential repairs benefit from flat rate simplicity, while large installs benefit from T&M transparency when the scope might genuinely change. This model captures 80 percent of the flat rate margin lift while avoiding the awkwardness of quoting a $12,000 custom HVAC retrofit on a single flat rate line. If your business has a mix of service and install work, hybrid is often the right answer.

   Pro tip: Never switch between T&M and flat rate on the same job type for the same customer. Consistency matters.