Running the shop · Owners, general managers and bookkeepers

How to price flat rate jobs from your real costs

A flat-rate price is only as good as the numbers behind it: real parts cost, real time on the job, and what an hour of your business actually costs. Guess any one of those and the price book is wrong on every ticket. This guide pairs a job costing prompt, to find your real numbers, with our free flat-rate price builder, to do the math.

What to get right

  • Start from your hourly cost, not the wage. Tech pay plus burden plus overhead, per billable hour. If you use wages alone, every price looks more profitable than it is.
  • Use your own task times. How long the job takes your techs, from past tickets. Not a guess, and not another shop’s book.
  • Know markup from margin. A 50% markup is a 33% margin. Set prices for the margin you want.
  • Check member prices too. The member discount comes out of your margin. Make sure the discounted price still covers your cost.

The prompt

This is the Summarize job costing workflow, word for word. Copy it, fill in the [brackets], and paste it into the AI tool your company uses.

Never paste: Bank or card numbers, account logins, employee pay rates and SSNs, customer addresses or phone numbers, tax IDs, or financing applications.
Summarize job costing for these jobs.
Jobs: [job #, type (AC replacement, repipe, panel upgrade), sold price, equipment/material cost, labor hours x loaded rate, permit, subs, financing fee]
Target gross margin: [%]

Table with gross profit and margin per job, flag jobs under target, and give the likely reasons (labor overrun, material, discounting, financing fees). Plain English summary at the end.

Fill it in with the prompt builder → Open the full workflow Bookkeeper / Accounting · saves 45 min per batch

How to use it

  1. Pull a batch of recently closed jobs with sold price, materials, labor hours and other costs.
  2. Run the job costing prompt to see the margin per job and which ones came in under target.
  3. Use the real labor and material numbers in the flat-rate price builder, task by task.
  4. Update your price book, then tell the team with the pricing update prompt.
  5. Repeat the job costing check every quarter.

Tools that can help

Optional. The prompt works without any of these.

Housecall Pro

Field service software

How it fits here: Its Basic plan lists a price book and Essentials adds flat-rate pricing, so new prices show up the same on every tech’s tablet.

Pricing: Basic from $59/mo billed annually; Essentials (5 users) and Max (8 users) cost more. 14-day free trial of Max, no credit card. Checked Oct 2026

FieldEdge

Field service software

How it fits here: Lists a pricebook and flat-rate pricing on every plan, plus QuickBooks Online and Desktop integration.

Pricing: Pricing on request Checked Oct 2026

Related workflows

Questions shops ask

What is flat-rate pricing in HVAC and plumbing?

A set price per task, quoted before the work starts, instead of billing time and materials. The customer knows the price up front; the shop carries the risk if the job runs long.

How do you calculate a flat rate price?

Parts at your markup, plus labor hours times your hourly cost, priced for your target margin. The flat-rate price builder shows every step of the formula.

Should I buy a flat-rate price book or build my own?

Either can work. A bought book still needs your own labor cost and margin behind it. Building your own takes longer but matches how your techs actually work.

Weekly email

One new workflow a week for service shop owners and their teams.

HVAC, plumbing, electrical. No hype; unsubscribe whenever.