Plumbing Business Guide
Plumbing Profit Margins: Review Job Costs and Revenue
Use a completed job and its records to see what revenue covers. Compare like periods and cost definitions before comparing service calls with installation work.
Quick Answer
For a stated period, margin equals revenue minus the included costs, divided by that same revenue. State whether you have included direct job costs only or also shared expenses. Keep billed revenue and cash received separate.
Start with One Completed Plumbing Job
| Service Type | Records to Collect | Allocation Question |
|---|---|---|
| Service/repair calls | Invoice, parts and time entries | Travel recorded directly or shared? |
| Drain cleaning | Labor, equipment and callback records | Equipment counted once? |
| Water heater replacement | Unit, disposal and installation records | Delivery recorded directly or shared? |
| Fixture installation | Fixture, parts and installation hours | Unused parts kept out of job cost? |
| Remodel rough-in | Approved scope, changes and hours | Supervision counted once? |
| New construction | Completed scope, progress bills and costs | Revenue matched to completed work? |
| Emergency after-hours | Agreed scope, invoice and actual hours | After-hours costs documented? |
Use the Same Period and Assign Each Cost Once
Choose a completed-job period. Start with billed revenue after agreed credits, then record cash received and any unpaid balance separately. Match costs to that work, mark estimates and missing expenses as unknown, and choose a consistent shared-cost allocation basis, such as documented labor hours. Count each expense once, either directly on the job or in the shared pool. For example, shared overhead divided by revenue is a revenue percentage; overhead divided by direct costs is a different loading percentage. Record the denominator.
- Service vehicles: Match fuel, repairs and vehicle records to the chosen period
- Licensing: Review license, education and insurance records with their covered periods
- Specialized equipment: Separate the equipment cost policy from parts used on this job
- Parts inventory: Distinguish parts used on completed work from parts still on hand
- Apprentice programs: Record training and job hours without allocating the same hours twice
Compare Work Mix on the Same Basis
Use actual completed work in the same period to describe your mix. Apply the same revenue and cost definitions to each group before comparing it. A different mix alone does not establish a different profit margin.
| Business Model | Records for the Period | Comparison Question |
|---|---|---|
| Service-focused | Actual service and install revenue | Same included costs for both groups? |
| Balanced | Actual completed jobs by work type | Same period and allocation basis? |
| Construction-focused | Completed scope and recorded costs | Unpaid balances kept separate? |
One Invented Revenue Example
Assume $300 billed revenue and only $50 or $75 of included labor cost. Then ($300 − $50) ÷ $300 = 83.33%, or ($300 − $75) ÷ $300 = 75% of revenue before other costs. These are invented inputs, not observed job margins. Parts, travel, equipment, callbacks and allocated shared costs are omitted; add the relevant records before calculating a fuller margin. This is a revenue-based percentage, not markup or net profit.
Choose One Next Records Question
- Quoted scope: Compare the agreed fixed price and exclusions with the work actually completed
- Additional work: Identify approved changes, their price and the parts and hours they required
- Maintenance work: Match revenue and visit costs to the period and service obligations being reviewed
- Payment records: Reconcile the invoice, credits, cash received and any documented payment-related costs
- Next question: Which missing parts receipt or time entry would most change this job review? Retrieve that record before comparing jobs
Separate roof-planning resource: For a roof project, open our Roof Replacement Cost Calculator and review its planning assumptions.
Continue with Your Own Figures
Have your job figures ready? Open Profit Score for a separate planning review, and compare its prompts with your own records. Keep missing expenses marked unknown.
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