MEPflow
Sign in Start free
MEPflow Blog

Flat Rate vs Time and Materials: How to Price Trade Work

Flat rate or time and materials? See how each pricing model handles labor, parts, overhead and risk, and which fits plumbing, HVAC and electrical jobs.

Published 13 min read

Two geometric structures represent pricing approaches

Flat Rate vs Time and Materials: How to Price Trade Work

Two geometric structures represent pricing approaches

Flat rate gives the customer one price before work starts. Time and materials (T&M) bills the hours and parts the job actually used. For most residential service calls in plumbing, HVAC and electrical, flat rate is the stronger default. T&M earns its place when nobody can tell you how long the job will take. Most healthy shops run both, and the skill is knowing which one a given call needs.

This guide is for owners and office managers of small plumbing, HVAC and electrical shops. It covers how each model works, where the money leaks, how to build a flat-rate price, and why markup and margin are not the same number.

MEPflow
mepflow.app
Price Each Job With Better Visibility
MEPflow combines a per-trade pricebook with job costing, so your team can price work in the field and track job costs in the office.
Explore pricing and job costing

TL;DR

Table of Contents

What each model actually means

In a time-and-materials arrangement, the customer pays for labor and materials, with a predetermined percentage markup on top. A fixed-price arrangement is a lump sum agreed before work begins. Cornell’s Legal Information Institute draws exactly that line.

In the trades, the day-to-day versions look like this:

The word “flat” is slightly misleading. A flat-rate price is not a fixed hourly rate. It is a price per task, built from time, rate, parts and markup, and it does not move with how long the tech happens to take.

How labor, materials and overhead are handled

The difference shows up in where overhead lives.

Under T&M, overhead and profit are recovered through two levers: the hourly labor rate and the materials markup. Even the federal government’s contracting rules reflect this. The Federal Acquisition Regulation says T&M hourly rates include wages, overhead, general and administrative expenses and profit, while materials are billed at actual cost under the regulation’s provisions. If your hourly rate only covers the tech’s wage and a little extra, overhead is not in it, and you are paying to do the work.

How overhead is included in each pricing model

Under flat rate, the same overhead and profit are built into the task price. Nothing is itemized for the customer, and nothing is hidden from you, because you set the price knowing what the task costs.

Who carries the risk

This is the question that decides most of the debate.

That shift is why flat rate rewards shops that run well. It pushes you toward better diagnosis, stocked trucks and first-visit completion. If that last point is your weak spot, our piece on two changes that raise first time fix rate is the place to start.

What customers feel

Contractors quoted by ACHR News say flat rate reduces customer anxiety because the total is stated upfront and does not climb with technician time. The same piece notes that it removes uncertainty about how long diagnosis, parts searching or repair will take.

That matches what most owners see at the kitchen table. A homeowner with a failed water heater or a dead condenser does not want to watch a meter. They want a number and a decision.

T&M is not without a case. Contractor Magazine’s Rodney Koop presents it as a workable volume model when labor prices stay low, material markups are reasonable and the contractor stays busy. His warning is the one many owners have lived: when you later raise T&M prices, customers notice and some push back.

When flat rate makes sense

Use flat rate when the task is repeatable and you can price it before you arrive or soon after diagnosis:

ACHR News reports that flat rate is often used in residential work. Its pricing guidance recommends that residential demand service use flat rate with bundling and discounts. HVAC contractors quoted in another ACHR article use flat rate unless a customer wants or needs unique work, which may be handled on a T&M basis, and some use both.

Good, Better, Best on top of flat rate

Flat rate pairs naturally with tiered options. Instead of one number, the tech presents three versions of the fix: a basic repair, a stronger repair with a longer warranty, and a replacement. Each option is a flat price. The customer chooses, and your average ticket rises without any pressure, because you are offering choices, not a markup surprise. Building these in the field with photos is exactly the job of a good estimate template, and we cover that in estimate templates that stop rekeying.

When time and materials is the better call

T&M is the honest answer when the cost is unknowable. Cornell’s explanation is that T&M is useful when scope or duration cannot be estimated accurately or costs cannot reasonably be anticipated at contracting.

In the trades, that means:

In commercial work, the menu is wider. ACHR notes that commercial contractors may use service contracts, T&M, quoted repairs, not-to-exceed work or turnkey proposals, and recommends that commercial demand service use commercial flat rate or T&M.

A practical hybrid: quote a flat diagnostic fee, then give a flat price for the repair once you know what it is. Where the repair really cannot be known, switch to T&M with a stated labor rate, a materials markup and a not-to-exceed cap that the customer approves in writing.

Side by side

Flat rate Time and materials
What the customer sees One price before work Hourly rate plus materials
Who carries overrun risk You The customer
Who benefits from a fast tech You The customer
Best for Repeatable residential service and replacements Unknown scope, troubleshooting, changing commercial work
Main danger Underpricing a task and repeating the loss Customer distrust and haggling over hours
What you need A price book built on real cost Accurate time and materials capture
Overhead recovered through The task price The hourly rate and the materials markup

How to build a flat-rate price

ACHR’s pricing coverage describes the method: assign labor time, a retail labor rate, parts cost and parts markup to arrive at a known repair price. It adds that the method works only when you understand your overhead.

Here is the sequence we would follow:

  1. Find your real cost of an hour. Wages are not enough. Add payroll taxes, insurance, vehicle, tools, training and benefits. Our guide to labor burden rate walks through it.
  2. Know your overhead. ACHR advises that you identify the cost structure of each line of business, such as a service call, install, maintenance agreement or commercial job, before you set a break-even figure.
  3. Time the task. Use your own techs’ typical time for the job, including drive-to-parts runs you cannot avoid, not the best day you ever had.
  4. Apply a retail labor rate. This is the rate customers pay per hour of task time, high enough to cover direct labor, overhead and profit.
  5. Add parts at cost plus markup.
  6. Round to a clean number and put it in the price book. Then everyone quotes the same price for the same task.

The same ACHR guidance says a price must cover direct costs, overhead and desired profit. Its worked example used a residential flat-rate labor figure of $275 per hour tied to a 60 to 65 percent margin target and a 50 percent service overhead rate. Treat that as one contractor-industry illustration, not your number. Your market, your costs and your overhead decide yours.

Building a T&M bill

A T&M bill uses the same inputs, spread differently: a labor rate per hour that carries overhead and profit, materials at cost plus a stated markup, and clear line items. Be explicit about trip charges, minimum hours and how you handle rounding of time. Ambiguity here is what makes customers feel nickel-and-dimed.

Markup vs gross margin

This is where good shops lose money without noticing.

Markup is the percentage you add to cost. Gross margin is the percentage of the selling price that remains after direct costs. They use different denominators, so the same price gives two different percentages.

An illustration: a part costs you 100 dollars. You apply a 50% markup and sell it at 150. Your gross profit is 50 dollars. Divided by the 150 selling price, that is a 33% gross margin, not 50%. To actually earn a 50% margin, you would price that part at 200, which is a 100% markup.

The formulas:

ACHR’s coverage makes a point worth keeping on a sticky note: a markup or multiplier is a pricing method used to target a desired gross margin, but contractors need raw gross profit dollars to pay the bills. A percentage does not pay the electric bill or the truck note. Dollars do.

The common failure is a shop that sets a 40% markup because it sounds like a 40% margin, then wonders why overhead eats the year. If you quote T&M materials at a markup, check what margin that markup actually produces, and whether it covers the overhead assigned to materials.

Protecting yourself on bigger fixed-price jobs

On larger flat-price work, such as a whole-house repipe, a full system replacement or a service upgrade, cash flow becomes its own risk. Tying payments to progress keeps you from financing the customer’s job. For the general logic, see how milestone payment schedules protect a project budget, then adapt the idea to your own deposit, rough-in and final stages. Put change-order language in the agreement so that surprises discovered mid-job have a path to a new price instead of an argument.

Our perspective

We are a master plumber, a master electrician and an HVAC technician, and we run MEPflow on our own trucks before anyone else sees it. Our view on this debate is simple: the pricing model matters less than whether you can see the result.

Most shops that struggle with flat rate do not have a pricing problem. They have a feedback problem. They set prices once, never compare them against what jobs really cost, and drift. Most shops that struggle with T&M have a capture problem: hours and materials that never make it onto the invoice because the tech wrote them on a receipt that stayed in the truck.

Our perspective — overview diagram

So we would tell any owner this. Quote flat rate wherever the task repeats. Keep T&M for the jobs that really are unknowns, and cap them. Then cost every job, labor, materials and overhead, and look at the numbers while the work is fresh, not at year end. If your prices are wrong you will see it within a few jobs, and fixing a price book is cheap compared with repeating a losing price for a year.

That is also why every MEPflow feature is on every plan. Estimates with Good, Better, Best options, invoicing with payment links, job costing and the trade calculators should not be something a three-truck shop has to upgrade to reach.

— Jonathan

Putting it into practice with MEPflow

Pricing only works if it makes it from the price book to the invoice without being retyped, and if the actual costs come back to you. MEPflow handles the office and the field in one application: Good, Better, Best estimates with photos, invoicing with instant payment links, job costing for labor, materials and overhead, and a per-trade pricebook. It is mobile-first, works offline so job status, photos and materials sync when signal returns, and runs the same data on a full desktop office side. We import your existing customer and job data for you, and it is month to month with no contract.

MEPflow

If you want to see what your jobs actually cost, start with our guides to simple job costing for plumbers and job costing methods, then see the estimate to invoice workflow. For pricing details, see the MEPflow pricing section. Free signup is capped at 5 customers with no trade tools. To book the 14-day trial, call 866-808-4996. Ready to set up? Create your company account.

FAQ

Is flat rate pricing always better than time and materials?

No. Flat rate is better for repeatable work where you can price the task upfront, which covers most residential service. T&M is more honest when scope or duration cannot be estimated, such as hard-to-trace faults or surprises behind walls. Most shops use both.

Does flat rate mean I charge the same price however long the job takes?

For the customer, yes. The price is agreed before work starts and does not rise with time on the job. For you, the price was built from task time, a labor rate, parts and markup, so a task that regularly runs long means the price needs to be rebuilt.

What is the difference between markup and gross margin?

Markup is the percentage added to your cost. Gross margin is the percentage of the selling price you keep. A 50% markup produces a 33% gross margin. Price for margin with cost divided by one minus the margin you want.

Can I combine flat rate and T&M on one customer?

Yes, and many contractors do. A common split is a flat diagnostic fee, then a flat repair price once the cause is known. If the repair really cannot be scoped, use T&M with an agreed hourly rate, a stated materials markup and a not-to-exceed cap.

Sources

MEPflow
Talk Through Your Trade Pricing
Contact MEPflow with questions about using a field-service app for estimates, invoicing and job costing in your plumbing, HVAC or electrical shop.

Recommended

Where to next