How to Choose a Fractional CFO for Construction

Two contractors this year reported gross margins in the high forties. Neither one was earning it.

In both cases the number was real arithmetic on incomplete inputs — costs that never made it onto a job. The margin wasn't wrong because someone lied. It was wrong because nobody had built the plumbing to make it right.

Key Takeaways

• Your gross margin looks healthy, but you couldn't say which jobs produced it
• Your WIP schedule is updated monthly and you suspect it's stale the day it's finished
• You've been told you need a CFO but every candidate sounds like they'd run your books, not your economics
• You want a forecast you could actually make a hiring decision on, not a rear-view report

What Does a Fractional CFO Actually Do for a Construction Company?

A fractional CFO for construction owns the numbers that drive decisions — job-level margin, work-in-progress, and forward cash — rather than the numbers that satisfy a filing deadline. That is the whole distinction, and it is the one most owners discover only after hiring the wrong person.

Bookkeeping answers what happened. Tax work answers what you owe. Neither answers the question a contractor actually loses sleep over, which is whether the job you are two-thirds through is going to finish where you bid it. That question requires cost to land on the job it belongs to, in the period it belongs to, and it requires someone whose job is to notice when it doesn't.

The practical test is not credentials. It is whether the person can look at your WIP schedule and tell you, without hedging, which line on it they do not believe.

There is a second function that owners tend to undervalue until they need it. A fractional CFO is the person who can say no to a job with a defensible reason attached. Growth in construction is rarely constrained by demand; it is constrained by working capital and by the willingness to walk away from work that consumes both. Without someone whose accountability is the forward position, that discipline falls back on the owner's instinct, which is the same instinct that built the company and is therefore biased toward yes.

How Do You Know If Your Construction Financials Are Actually Wrong?

You know because the reported margin and the felt margin have separated, and nobody can explain the gap. If the P&L says you are making money and the bank account disagrees, one of them is describing a fiction.

One commercial contractor we worked with opened an engagement with a reported year-to-date gross margin of roughly 48 percent. The number was arithmetically correct. It was also badly wrong, because about $184,000 of cost had never been assigned to an individual job — it sat in an overhead bucket where it depressed nothing and distorted everything. Reallocated, the true margin was closer to 36 percent. Twelve points, on a business making bid decisions off the higher number.

That is not an accounting error in the ordinary sense. Every transaction was recorded. The failure was structural: there was no mechanism forcing cost to find its job, so cost that had no obvious home simply stopped looking for one.

For context on what healthy looks like in this industry, CFMA's 2024 Construction Financial Benchmarker put all-respondent gross profit at 21.8 percent across 1,290 companies that submitted validated financial statements. A contractor reporting 48 is not outperforming the industry by twenty-six points. A contractor reporting 48 has a coding problem.

What Should You Ask a Fractional CFO Before Hiring Them?

Ask four questions, and listen for whether the answers are specific or atmospheric.

First: how will you tie WIP to the income statement, and how often? A good answer names a cadence and a reconciliation. At one contractor, revenue recognized on a percentage-of-completion basis and revenue actually recorded were separated by roughly $62,000 — a gap that existed quietly because nothing in the close process was designed to surface it. If your candidate treats WIP as a report rather than a control, you will keep finding gaps like that after the quarter closes.

Second: what will you do about cost that arrives late? Subcontractor and fuel invoices show up after the period they belong to. One energy services contractor handled this with a disciplined accrue-and-reverse method so the job carried its cost in the right month. The wrong answer is a shrug and a promise to catch it next period, because next period is when the bid goes out.

Third: how do you build indirect labor burden into estimating? If burden lives only in overhead, every estimate you produce is optimistic by a predictable amount, and you will never find out by how much.

Fourth: what is your forecast horizon, and what decision is it built to support? A thirteen-week cash forecast that tells you receipts of roughly $40,000 against a projected weekly cash decrease of about $48,000 is a decision-grade instrument. A monthly cash summary is a history lesson.

Does a Fractional CFO Make Sense at $10M to $50M in Revenue?

This is the band where the answer is usually yes, and the reason is structural rather than financial. Below roughly $10 million, an owner can still hold the whole business in their head, and the cost of formal financial infrastructure outruns its value. Above $50 million, the complexity typically justifies a full-time hire.

In between, you have enough jobs running simultaneously that intuition stops scaling, and not enough overhead capacity to absorb a full-time executive salary. That is not a compromise position. It is the position where the work has the highest leverage, because you are installing the discipline before the mistakes get expensive.

One contractor in this range carried a $3.4 million backlog alongside roughly $284,000 of aged fireproofing receivables. Neither figure is alarming on its own. Together they describe a company whose growth was being funded by float it did not control — the kind of thing that is obvious in hindsight and invisible without a forecast.

What Goes Wrong When You Hire the Wrong Financial Help?

The most common failure is not incompetence. It is scope. You hire someone to clean up the books, they clean up the books, and eighteen months later you still cannot answer which of your jobs made money.

The second failure is slower and harder to see. A generalist will produce accurate reports that describe construction using categories built for other industries. Retainage, percentage-of-completion, backlog, and job-level burden are not exotic features — they are the mechanics of how a contractor actually earns. A financial partner who treats them as edge cases will give you a tidy P&L and no operating visibility.

If you are weighing what a construction-specific engagement covers, our page on fractional CFO for construction companies lays out the scope in more detail than a blog post reasonably can.

What Will a Fractional CFO Not Do for You?

They will not run your accounting department, and a firm that agrees to do both is usually doing one of them badly. The CFO function depends on someone else owning transaction-level accuracy, which means the arrangement works when there is a competent bookkeeper or controller underneath it and struggles when there is not.

They will also not fix an operational problem by reporting on it more precisely. If jobs are losing money because estimating is optimistic or because field productivity is inconsistent, better financial visibility will identify that faster and will not resolve it. The value is in knowing sooner and knowing specifically — which is considerable, and which is not the same as the problem going away.

It is worth agreeing on this boundary before an engagement starts. A good deal of dissatisfaction with fractional finance work traces back to an unspoken expectation that the numbers person would somehow also fix the thing the numbers revealed.

What Does the First Ninety Days Look Like?

The first move is diagnostic, not corrective. Before anything gets rebuilt, the cost coding gets tested — pick a handful of closed jobs and trace whether every dollar that belonged to them actually landed on them. That exercise is where the $184,000 surfaced, and it takes days rather than months.

From there the sequence is usually: tie WIP to the income statement and hold it monthly; install a method for late-arriving cost; put burden into the estimate; then stand up a rolling thirteen-week cash forecast. None of this is exotic. What makes it work is that it happens in that order, because a forecast built on miscoded job cost is a confident wrong answer.

Your Next Step

You Do Not Have a Reporting Problem. You Have a Coding Problem.

If your reported margin and your bank balance are telling different stories, the fix starts with finding out where cost stops following the job. That is a days-long diagnostic, not a transformation project.

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Common Questions

Frequently Asked Questions

How Much Does a Fractional CFO Cost for a Construction Company?

Pricing varies with scope and cadence, so any firm quoting a number before understanding your job volume and close process is guessing. The more useful question is what the engagement covers — monthly WIP tie-out, cash forecasting, and estimating support are meaningfully different levels of effort than financial reporting alone.

What Is the Difference Between a Fractional CFO and a Construction Controller?

A controller owns accuracy: the books close correctly and on time. A CFO owns the decisions those numbers support — pricing, capacity, and cash. Many contractors in the $10M to $50M range genuinely need both functions, and the mistake is assuming one role can quietly absorb the other.

How Often Should a Construction WIP Schedule Be Updated?

Monthly is the working standard, and the harder requirement is that it reconcile to the income statement every time. A WIP schedule that is produced monthly but never tied out will drift, and the drift is invisible until a job closes well away from where it was reported.

Can a Fractional CFO Help With Job Costing Accuracy?

That is usually the first thing they touch, because everything downstream depends on it. Forecasts, bids, and margin analysis all inherit whatever errors exist in job cost coding, so a CFO who starts anywhere else is building on a foundation nobody has tested.

When Is a Construction Company Too Small for a Fractional CFO?

Below roughly $10 million in revenue, most owners still have enough direct visibility that formal financial infrastructure costs more than it returns. The signal to move is usually running enough concurrent jobs that you can no longer answer margin questions from memory.