Flat-rate pricing moves the hardest moment of a service call from the end to the beginning. Instead of the customer seeing a total after the work is done, they see and approve a price before the tech picks up a tool. That changes the conversation, the risk and the way you have to build your prices.
Flat-rate pricing in plain English
An HVAC tech diagnoses a failed run capacitor. The price book says "Replace run capacitor: $280." The customer approves it. Whether the swap takes 25 minutes or 70, the bill is $280.
Behind that number (example figures): the task is set at 1 hour, the shop's flat-rate hourly rate is $180, and the capacitor costs $40 and sells at $100. $180 + $100 = $280. The tech never does the math on site; the price book did it ahead of time.
How do you calculate a flat-rate price?
Flat-rate task price
The two inputs that make or break it:
- The hourly rate. Not the tech's wage. It has to cover loaded labor cost (wages plus payroll taxes, benefits and insurance), overhead spread across billable hours only, and profit. It is usually far higher than the wage, which is why owners who price from wages lose money. The calculator below walks through it.
- The task time. The realistic time for a competent tech, including setup and cleanup. Too short and every job loses money; too long and your prices stop being competitive.
Worked example: building three tasks
| Task (example) | Task hours | Labor at $180/hr | Parts at selling price | Flat rate |
|---|---|---|---|---|
| Replace run capacitor | 1.0 | $180 | $100 | $280 |
| Replace condenser fan motor | 1.5 | $270 | $310 | $580 |
| Clear condensate drain and treat pan | 0.75 | $135 | $25 | $160 |
Common mistakes in the math
- Using paid hours instead of billable hours to spread overhead. Techs are paid for drive time, training and shop time that no customer pays for.
- Marking up parts but forgetting labor drift. Raises and benefit costs creep up every year; task prices should follow.
- Copying a vendor's task times without checking them against your own jobs.
Who carries the risk in flat-rate pricing?
The contractor does. Federal contracting rules describe the same trade-off for firm-fixed-price contracts: the seller takes maximum risk and full responsibility for costs and the resulting profit or loss, because the price doesn't change with actual costs.1 In a service business, that means a slow job costs you and a fast job pays you. It also means your efficient techs earn the shop more, the reverse of hourly billing.
Flat-rate pricing vs time and materials
| Flat-rate pricing | Time and materials | |
|---|---|---|
| When the price is known | Before work starts | After the work is done |
| Who carries time risk | The contractor | The customer |
| Fast techs | Earn the shop more | Earn the shop less |
| Best fit | Repeatable repairs and maintenance | Unknown scope, commercial and hidden-condition work |
| Main risk | Underpriced tasks lose money on every call | Customers resist an open-ended bill |
Time-and-materials pricing is the right choice when the scope can't be estimated. Federal rules allow T&M contracts only when the extent or duration of work can't be estimated accurately at the start.2 The flat rate vs time and materials decision tree goes through which jobs suit which model by trade.
Is flat-rate pricing fair to customers?
It can be, and it depends on how the prices are built and presented. A flat rate is fair when the task time reflects a competent tech's real average, the hourly rate reflects real costs, and the customer sees and approves the price before work starts. The customer pays the same as their neighbor for the same repair, whichever tech arrives.
It stops being fair when task times are padded far beyond reality, or when a single quick fix is presented as the only option at an inflated price. Customers talk to each other and compare quotes, so a price book that can't be explained in one sentence per item tends to cost you reviews and repeat business. A good test: could your tech explain, without embarrassment, how the price was built?
Pros and cons of flat-rate pricing
Pros
- Customers approve a known price before work starts
- Same repair, same price, whichever tech goes
- Efficient techs make the shop more money
- Faster invoicing: no time sheets to reconcile per job
- Pairs naturally with good-better-best options
Cons
- You absorb jobs that run long
- Prices must be rebuilt as labor and parts costs change
- A bad task time loses money on every call
- Odd or unknown-scope jobs don't fit a fixed task
- Building the first price book takes real time
How to keep flat rates honest
Flat-rate upkeep
- Recalculate the hourly rate every year, and after any raise or benefits change
- Update part costs when a supplier price change lands
- Check revenue per labor hour by job type every month
- Fix task times that run long more than half the time
- Keep descriptions in plain words the customer understands
- Price add-on parts and second repairs as their own tasks
Your price book is where all of this lives.
How flat-rate pricing shows up in TradesWork
In TradesWork, the price book holds each task's price, member price, cost and margin, and price changes are staged as drafts that don't reach the field until published. Technicians price from the full price book on their phone even with no signal. Job costing reports revenue per labor hour by job type, the quickest check on whether your flat rates cover your techs' actual time. If a supplier's cost rises more than 3% above the cost in your price book, AI office help proposes a cost update for you to approve (the 3% threshold is adjustable).
Footnotes
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FAR 16.202-1, Firm-fixed-price contracts, Federal Acquisition Regulation, Acquisition.gov, accessed October 15, 2026. ↩
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FAR 16.601, Time-and-materials contracts, Federal Acquisition Regulation, Acquisition.gov, accessed October 15, 2026. ↩
