What is flat rate pricing? Flat rate vs time and materials
Flat rate pricing means the customer pays one fixed price for a defined job, set before work begins, regardless of how long the job takes. The contractor builds labor, parts, overhead, and profit into each task price up front, instead of billing hours and materials after the fact. It’s the standard pricing model in residential HVAC, plumbing, and electrical service work.
How flat rate pricing works
Every flat-rate task price comes from the same formula. You work it once per task, load the results into your price book, and your techs quote from the book instead of guessing on the driveway.
- Direct cost= labor hours × your loaded hourly labor cost (wage plus taxes, insurance, and burden — not the bare wage) + parts cost
- Effective cost= direct cost × (1 + overhead percentage), so rent, trucks, and office wages are carried by every job
- Flat rate price= effective cost ÷ (1 − target gross margin)
Example: 1 hour at a $45 loaded rate plus an $18 part is $63 of direct cost. Add 25% overhead ($78.75), then price at a 60% gross margin: $78.75 ÷ 0.40 = about $197. You can run your own numbers in the free flat rate price calculator, and if you want the trade-specific version of this math worked through real repairs, see our guide to HVAC flat rate pricing.
When time and materials still makes sense
Flat rate isn’t a religion, and there are jobs where T&M is the honest way to bill:
- Unknown scope. Chasing an intermittent electrical fault or a hidden refrigerant leak can take one hour or six. Charge a flat diagnostic fee, then flat rate the repair once you know what it is.
- Disaster and restoration work.Flood cleanup, storm damage, and burst-pipe emergencies have no defined task list. T&M with a written rate sheet protects both sides.
- Genuine one-offs.Custom fabrication or an oddball commercial retrofit you’ll never do again isn’t worth building a task price for.
For the 80% of service calls that are repeatable — capacitors, water heaters, breakers, motors — flat rate wins on ticket size, customer trust, and tech sanity.
Common objections, answered
“Customers will think I’m hiding my rate.” The opposite happens in practice. In the flat rate vs hourly HVAC debate, homeowners consistently prefer a firm number over an open-ended clock. Nobody likes watching a tech work slowly at $150 an hour.
“I’ll lose money on jobs that run long.”Some jobs run long, some run short. If your labor hours are honest averages and your margin target is right, it evens out — and unlike T&M, no single fast job is billed below cost.
“Building the book is too much work.” This one’s half true. Pricing 300 tasks by hand is a slog, which is why most shops either start from a template and grow it, or pay someone to build it once. We wrote a step-by-step guide on how to build a flat rate price book if you want the DIY route, and PriceTuneup offers a done-for-you rebuild if you don’t.
Frequently asked questions
Is flat rate pricing more expensive for customers?
Not inherently. A well-built flat rate is the same math a fair T&M shop would land on for a normal job — labor, parts, overhead, and a sustainable margin. Slow techs cost the customer more under T&M; under flat rate the shop absorbs that. Some individual jobs price higher, some lower, but the customer always knows the number before work starts.
Is flat rate pricing legal or required?
It’s legal everywhere in the US and required almost nowhere. A few states and some auto-repair contexts have written-estimate rules, but for HVAC, plumbing, and electrical service work, flat rate vs time and materials is a business decision, not a legal one. Standard disclosure rules about estimates and change orders still apply either way.
How do I convert from time and materials to flat rate?
Start with your real numbers: loaded hourly labor cost, overhead percentage, and a target gross margin. List your 50 most common tasks, assign realistic labor hours and current part costs to each, and price them with the formula (direct cost, plus overhead, divided by one minus target margin). Load them into your field software as fixed-price line items and stop quoting hours.
What’s a good gross margin for HVAC flat rate pricing?
Most healthy residential HVAC service shops target 55 to 65 percent gross margin on flat-rate repair tasks. That’s gross margin — (price minus direct cost) divided by price — not markup. Below 50 percent, overhead and slow days eat what’s left and net profit disappears.
Does flat rate pricing work for plumbing and electrical too?
Yes. Any trade with repeatable tasks can flat rate: water heater swaps, faucet replacements, panel upgrades, ceiling fan installs. The formula is identical — only the labor hours and part costs change. Plumbing and electrical shops on Housecall Pro build flat-rate price books the same way HVAC shops do.
Put the formula to work on your own numbers
Run a task through the free calculator and see what it should sell for at your margin. Or skip the spreadsheet phase entirely: PriceTuneup rebuilds your whole Housecall Pro price book at your target margins for $249, one time.