How to Choose a Bookkeeper for Your Plumbing Business
Hiring the wrong bookkeeper is one of the more expensive mistakes a plumbing contractor can make, and it is a mistake that takes months to become obvious. The reports arrive on time, the bank reconciles, everything looks orderly, and then one day you realize you cannot answer basic questions about your own business.
Which is more profitable, your service department or your new construction work?
What did you actually make on that whole-home repipe last month?
The books were never wrong, exactly. They were just never built to tell you anything useful.
This is a practical guide to making that hire well. It covers what a good plumbing bookkeeper actually does, the signs you have the wrong one, what to look for instead, and the specific questions worth asking before you sign anything.
For the broader picture of what plumbing bookkeeping should look like, see Plumbing Bookkeeping: What to Track and Why.
What a good plumbing bookkeeper actually does
Categorizing transactions and reconciling the bank is table stakes. Any competent bookkeeper can do that for any business. A bookkeeper who can genuinely help a plumbing company does several things a generalist typically cannot.
They separate your revenue by type of work, because service, new construction, and repipe work have very different margins and blending them into one line hides which part of the business is carrying the company.
They set up job costing so you can see gross profit on individual jobs rather than just a monthly total.
They handle burdened labor correctly, using the real cost of a plumber including payroll taxes and workers comp rather than base wages, which matters enormously in Florida where workers comp rates for the trades are high.
They track fixtures and materials distinctly so you can see whether a margin problem came from pricing or from material cost. And they produce monthly reports with enough context that you can actually act on them.
If a bookkeeper cannot do those things, they are a generalist working on a plumbing company, and the reports they hand you will be accurate and useless at the same time.
Signs you have the wrong bookkeeper
The clearest sign is a P&L with one revenue line. If your service calls, new construction work, and repipes all land in the same bucket, your bookkeeper does not understand how a plumbing business makes money, and every report built on that structure is misleading you.
The second sign is the inability to tell you what a specific job earned. If you ask what the margin was on last month's repipe and the answer is vague, there is no job costing in place, which means you are pricing future work on guesses.
The third sign is labor tracked at base wages. A plumber's real cost to your business is meaningfully higher than their hourly rate once you add payroll taxes, workers comp, and benefits. A bookkeeper using base wages in job costing is producing numbers that make every job look better than it was.
The fourth sign is reports with no commentary. A monthly P&L emailed with no context, no flags, and no interpretation is data entry, not bookkeeping support.
The fifth sign is a bookkeeper who has never asked about your work mix. Someone who has not asked what percentage of your revenue is service versus new construction does not have the context to structure your books usefully.
What to look for instead
Look for trade experience specifically. A bookkeeper who has worked with plumbing, HVAC, electrical, or other home service contractors understands job costing, burdened labor, and the seasonal and material dynamics of the work. Generic small business experience is not the same thing.
Look for a clear job costing methodology. Ask them to walk through how they would set up costing for a whole-home repipe with two plumbers, a materials package, and a permit. If the answer is specific, keep talking. If it is vague, move on.
Look for a point of view on your chart of accounts. A bookkeeper who has done this work before will tell you how your accounts should be restructured rather than preserving whatever you currently have. Preserving a broken structure is not a service.
Look for CPA involvement somewhere in the engagement. Your bookkeeper does not have to be a CPA personally, but there should be a CPA reviewing the work or available for the complex questions, because bookkeeping decisions have tax consequences and books prepared without that oversight tend to create expensive problems in April.
Look for proactive communication. Monthly financials are the floor. The right bookkeeper flags issues before you ask about them and answers questions in days rather than weeks.
Questions to ask before signing
These questions separate specialists from generalists quickly, and the quality of the answers tells you most of what you need to know.
How many plumbing or home service contractors do you currently work with?
How would you set up job costing for a typical repipe job?
How do you handle the difference between service revenue and new construction revenue on the P&L?
Do you use burdened labor or base wages in job costing?
How do you track fixtures separately from parts and materials?
Is a CPA involved in the work, and in what capacity?
How often do you deliver financials, and does the package include commentary?
What is your typical response time when I have a question?
A bookkeeper who answers these clearly is worth continuing with. One who deflects, generalizes, or pivots immediately to price is telling you they do not have the depth.
Pricing expectations
Specialty contractor bookkeeping typically runs $500 to $2,500 per month depending on transaction volume, whether the scope is categorization only or full back-office including AR, AP, and monthly close, and whether a CPA is involved.
National online bookkeeping services advertise lower monthly rates, but they are generally built for generic small business bookkeeping and do not include job costing or the trade-specific structure a plumbing company needs. The cleanup fees and rotating support often erase the apparent savings.
In-house bookkeeping is the most expensive option once you add salary, payroll taxes, benefits, and overhead, typically running $65,000 or more annually for a competent full-charge bookkeeper. That makes sense at real scale and rarely below it.
For most plumbing contractors doing $500,000 to $5 million in revenue, a specialty contractor bookkeeping firm is the right answer, because it delivers the structural work and reporting you need without the cost of a full-time hire.
At Prophet Accounting, we work with plumbing contractors and other home service trades across Port St. Lucie, the Treasure Coast, and nationwide.
We separate revenue by work type, set up job costing that shows real margins by job, handle burdened labor correctly, and deliver monthly reporting you can actually use.
If you want to see what specialty contractor bookkeeping looks like in practice, schedule a consultation at prophetaccounting.com/contractors.
For a quick pricing estimate, our pricing calculator gives you a ballpark in about two minutes.
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Not necessarily, but there should be CPA involvement somewhere in the engagement, whether reviewing the books, supporting tax season, or available for complex questions. Bookkeeping decisions carry tax consequences, and books prepared with no CPA oversight tend to create problems at year end that cost more to fix than the oversight would have cost.
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Specialty contractor bookkeeping typically runs $500 to $2,500 per month depending on transaction volume, scope, and CPA involvement. National online services advertise less but usually exclude job costing and trade-specific structure. In-house bookkeeping runs $65,000 or more annually once fully loaded.
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A generalist can categorize transactions and reconcile accounts, but they typically cannot set up job costing, separate service from new construction revenue correctly, or handle burdened labor. For a plumbing business doing $500,000 or more, those gaps usually make a specialist worth the change.
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Job costing means tracking materials, burdened labor, permits, and other direct costs against specific jobs so you can see the gross profit each job produced. Without it, you only see monthly totals, which makes it impossible to know which types of work or which customers are actually profitable.
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Usually when one of three things happens: the business has outgrown what a generalist can handle, the year-end handoff to your tax preparer is a scramble every April, or your monthly P&L is not producing decisions because it is too generic. Any of those suggests the books have become the bottleneck.
