# What is a healthy gross margin for plumbers? Key benchmarks
A healthy gross margin for a plumbing business falls between 35% and 50%, with top-performing shops consistently hitting 45–55% on residential service work. Most small to mid-sized plumbing companies land somewhere in the 30–40% range. Anything below 30% is a warning sign that labor costs, materials markup, or job pricing are quietly eroding the business's ability to survive a slow season.
Disclaimer: This article is for informational purposes only and does not constitute financial or accounting advice. Consult a licensed CPA or financial advisor familiar with the trades before making changes to your pricing or cost structure.
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Before benchmarking anything, you need to know what gross margin actually measures — and what it doesn't.
Gross margin = (Revenue − Cost of Goods Sold) ÷ Revenue × 100
For a plumbing business, Cost of Goods Sold (COGS) includes:
COGS does not include office salaries, your truck lease payments, software subscriptions, or marketing spend. Those are operating expenses that live below the gross profit line and affect your net margin.
A quick worked example:
Say your plumbing company billed $680,000 last year. Your direct labor cost (field techs only) was $210,000, and your materials cost was $125,000. COGS totals $335,000.
Gross Profit = $680,000 − $335,000 = $345,000
Gross Margin = $345,000 ÷ $680,000 = 50.7%
That's a strong number. But notice how sensitive it is: if that same company under-billed materials by 15% — a common error when techs grab supplies without logging them — materials cost balloons to ~$144,000, gross margin drops to about 48%. Multiply that slippage across hundreds of service calls and you've left $20,000+ on the table.
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Industry data from the National Association of Plumbing-Heating-Cooling Contractors (PHCC) and financial benchmarking firm Contractor Profit Zone consistently point to a median gross margin in the 30–40% range for small plumbing operations (under $2M in annual revenue). Mid-sized companies ($2M–$10M) that have invested in flat-rate pricing and dispatching software tend to cluster closer to 38–48%.
Here's how that breaks down by segment:
| Business type | Typical gross margin range | Notes |
|---|---|---|
| Solo/owner-operator | 45–60% | Low labor burden; owner IS the labor |
| Small residential service (2–5 techs) | 32–42% | Labor burden and callback risk add up |
| Mid-sized residential/light commercial | 38–50% | Flat-rate pricing helps; dispatcher overhead appears below gross |
| Commercial new construction | 18–28% | Competitive bidding compresses margins |
| High-end remodel/specialty work | 45–60% | Less price sensitivity; complexity commands premium |
The commercial new construction number often surprises plumbing business owners who assume bigger contracts mean bigger margins. They don't. General contractors bid hard, payment timelines stretch, and material waste on large projects is difficult to control without a dedicated project manager. The 18–28% range is consistent with what trade-specific CPAs report for sub-$5M commercial contractors.
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Most plumbing business owners know their techs' hourly rate. Fewer have accurately calculated their fully-loaded labor burden — the true cost of each field hour after adding payroll taxes (~7.65% FICA), workers' compensation insurance (which can run 15–25% of wages in the trades depending on your state and claims history), health insurance contributions, and paid time off.
A tech earning $28/hour might actually cost you $38–42/hour all-in. If your flat-rate or hourly billing is calibrated to $28, you're pricing off a fiction.
Industry practice for residential service plumbing is to mark up materials 25–50% over your actual cost (not list price). Many small shops mark up 10–15% "to stay competitive," which is leaving substantial margin on the table. Customers rarely price-shop a $45 shutoff valve — they're buying your expertise and response time. A 2022 survey by the PHCC found that plumbers who adopted flat-rate pricing books reported an average 11-point improvement in gross margin versus those pricing time-and-materials.
A single callback — a tech driving back to fix a leak that wasn't caught on the first visit — can consume the entire gross profit from that job and then some. If your callback rate exceeds 3–5% of jobs, it's a margin killer that won't show up as an obvious line item but will steadily compress gross profit.
A full-time field technician works roughly 2,080 hours per year. After subtracting drive time, shop time, training, and administrative tasks, most techs bill 65–75% of those hours. Elite shops push 78–82% billable efficiency through tight routing, digital dispatching, and pre-stocked trucks. Each percentage point of billable efficiency recovered on a $38/hour tech is worth roughly $790/year — modest on one tech, material across five.
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Residential service and repair is the higher-margin business. Homeowners are less price-sensitive than general contractors, decisions happen fast, and the jobs are typically smaller — meaning one pricing mistake doesn't sink your quarter. Target 40–50% gross margin on residential service work. If you're doing drain cleaning, water heater replacements, or fixture installs at scale, 45%+ is achievable with flat-rate pricing.
Commercial work is a different equation. Design-build or design-assist projects can protect margin better than hard-bid work, but even then, 28–38% is a realistic target for commercial service. Hard-bid new construction at the sub-$5M level is difficult to run profitably above 25% gross — and many shops don't realize this until they've grown their revenue significantly while watching their bank account stay flat.
The practical implication: if your plumbing business does a blend of both, track gross margin by job type, not just in aggregate. A company doing $3M in revenue at a blended 32% gross margin might be running residential at 46% and commercial new construction at 18% — and the commercial work is quietly subsidized by the residential profit.
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Raising prices is the fastest lever, but it's not the only one. Here are four strategies that improve margin without touching your rate card:
Switch to flat-rate pricing. Time-and-materials billing rewards slow technicians and punishes efficient ones — and it hands customers a number to argue about. Flat-rate pricing books (ServiceTitan, Profit Rhino, and Successware all have built-in flat-rate modules) let you build your target margin into every job before the truck rolls. The PHCC data cited earlier shows an average 11-point margin gain for shops that make the switch.
Audit your truck stock. Technicians who leave a job to run to the supply house lose billable hours and incur fuel cost. A well-stocked, organized truck — with inventory tracked digitally — keeps techs on-site, billing. Industry benchmarks suggest a properly stocked service truck generates 15–20% more billable revenue per day than a poorly stocked one.
Reduce materials leakage. Parts pulled from the truck that don't get logged to a job are pure margin erosion. Requiring techs to photograph parts used or scan barcodes before close-of-job (a feature available in ServiceTitan and Jobber) closes this gap. One mid-sized residential plumbing operation I'm familiar with recovered roughly $34,000 in materials cost in their first year of using job-level materials tracking — on a $1.8M revenue base, that's nearly two full margin points.
Negotiate supplier terms, not just price. Most plumbing shops negotiate unit price with their supply house. Fewer negotiate payment terms. Net-30 terms on materials mean you can collect from the customer before the materials bill is due — improving cash flow without touching gross margin directly. Some supply houses will also offer rebate programs at volume thresholds that effectively reduce your materials cost retroactively.
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Underbidding service calls to "win" the job. In residential plumbing, price is rarely the primary decision factor for a homeowner with water on the floor. Response time, reviews, and trust outweigh a $50 price difference almost every time. Competing on price in a market where you don't have to trains customers to expect it and trains your techs to apologize for your rates.
Forgetting to re-price after supplier increases. Material costs in the plumbing supply chain jumped significantly in 2021–2022 and have remained elevated in many categories. Shops that haven't revisited their flat-rate books or materials markup percentages since 2020 are almost certainly running thinner than they realize.
Mixing overhead into COGS. This distorts gross margin and makes it impossible to benchmark accurately. The owner's salary, the office manager, the truck insurance — these are operating expenses. Keep them below the gross profit line so you can see your true production economics clearly.
Ignoring small jobs. A $180 drain clear might feel like a time sink, but if it takes 45 minutes and costs you $15 in materials, the gross margin is over 80%. Small, high-frequency jobs are margin engines. The mistake is pricing them like big jobs with high overhead allocation.
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For residential service work, target 40–50% gross margin. Commercial service can run 28–38%. Hard-bid new construction is rarely profitable above 25% for smaller contractors. If your blended gross margin is below 30%, examine your labor burden calculation and materials markup first — those are the two most common culprits.
No. Gross margin measures revenue minus direct job costs (labor and materials). Net profit margin subtracts all operating expenses — rent, admin salaries, trucks, insurance, software, marketing — from gross profit. A plumbing company can have a healthy 42% gross margin and a net margin of only 8–12% after overhead. Both numbers matter; gross margin tells you how well you price and produce, net margin tells you how well you run the business.
Solo owner-operators often post the highest gross margins (45–60%) because the owner performs the labor and has minimal burden. As you add technicians, gross margin typically compresses to 32–45% due to fully-loaded labor costs and the inefficiency of managing multiple people. Mid-sized companies that invest in systems — flat-rate pricing, dispatch software, materials tracking — can recover much of that compression.
It's difficult. After paying operating expenses (which for most plumbing businesses run 20–30% of revenue), a 25% gross margin leaves little or nothing for owner compensation, debt service, or reinvestment. Most trade-focused CPAs consider 30% the floor for a viable plumbing business. Below that, the math requires very low overhead — which usually means an owner-operator with no staff, no office, and no growth ambitions.
Significant. Drain cleaning, water heater replacements, and fixture installs tend to carry higher margins than new construction roughing or remodel work with complex variables. Businesses that track gross margin by job category typically discover one or two service types driving most of their profit — and one or two dragging the average down. That data is the starting point for smart service mix decisions.
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Pull your last 90 days of job data and calculate gross margin by job type — not as a blended total. If you're using field service software like ServiceTitan, Jobber, or Housecall Pro, this report already exists. If you're working from a spreadsheet, sort completed jobs by category, subtract labor and materials from revenue for each group, and divide. What you find will tell you more about your business's financial health than any single benchmark — and it will show you exactly where to focus first.
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This article was produced with AI assistance and reviewed by the Growth Sparked editorial team. Statistics and benchmarks referenced are drawn from PHCC industry data, Contractor Profit Zone benchmarking reports, and publicly available trade industry research. Always verify figures with a licensed CPA before making financial decisions.