Knowledge · Cash flow and finance
The numbers that tell you
how the business is really going.
A residential builder does not fail from a shortage of numbers, it fails from watching the wrong ones too late. This is the reference for the measures that actually run a building business, the financial ones that show whether the work makes money and the operational ones that show why, and how to read them as movement rather than as a monthly total.
01 / Overview
Measures that move, not numbers that sit
A key performance indicator is only useful if it changes a decision. Plenty of builders produce monthly reports full of numbers that no one acts on, because the numbers describe the past rather than pointing at the future, or because no single person owns the job of moving them. The measures that matter are the handful that tell a builder, early enough to act, whether a job and the business are on track.
The measures split into two groups that describe the same reality. The financial measures, margin, WIP, cash conversion, tell you whether the business is making and keeping money. The operational measures, build time, defect rate, supervisor capacity, tell you why. The operational ones usually lead and the financial ones usually lag, which is the whole reason to watch both, and to read them as part of one connected system rather than a scoreboard of separate figures. That connected view is the subject of construction business systems.
Why it matters
The point of these measures is to catch a problem while it is still cheap. A margin read at close-out cannot be fixed, but a forecast margin that has slipped two points this fortnight can. Everything here is framed around that idea, the value is in the trend and the timing, not in the number on its own. Any target figures a builder sets should come from their own recorded history rather than from a borrowed benchmark.
02 / Financial
The financial measures
These measure whether the business is making money and keeping it. Margin says whether the work is profitable, WIP says whether the profit is real or just billed, and cash conversion says whether the profit ever reaches the bank.
Gross margin
Revenue less the direct cost of building the job, expressed as a share of revenue. It measures whether the work itself makes money before the cost of running the office. A gross margin that looks healthy at estimate but shrinks by handover is the clearest early sign of profit fade.
Net margin
What is left after both direct job costs and the overheads of running the business. A builder can hold a solid gross margin and still make no net profit if overhead is not carried in the price. Net margin is the number that decides whether the business, not just the job, is viable.
Forecast margin
The margin the job is now expected to finish on, built from cost to date plus commitments plus cost to complete. Unlike the estimate margin, which is a starting position, forecast margin is a live number that moves as the job runs, and watching it move is how a fade is caught while it can still be acted on.
Work in progress (WIP)
The reconciliation of work earned against work billed on every open job. It reveals whether a builder is over-billed, holding cash for work not yet done, or under-billed, having done work not yet claimed. WIP is less a single number than a position that has to be read job by job.
Cash conversion
How well earned margin turns into cash actually in the bank, and how quickly. A profitable builder can still fail if cash arrives slower than it is spent, which is why cash conversion, driven by claim timing and payment terms, sits alongside margin rather than beneath it.
Each of these has a deeper reference in the finance cluster, from margin and markup and forecast final cost to WIP reporting, cash flow and profit fade. This page is the summary of what to watch; those pages explain how each number is built.
03 / Operational
The operational measures
These measure how the work is actually being delivered, and they are usually the leading indicators of the financial results. A build running long, a defect rate creeping up or a supervisor carrying too many jobs all show up in the margin eventually, but they show up here first.
Build time
The elapsed time from start on site to practical completion. Because the cost of running a job, the preliminaries, accrues with duration, build time is a cost driver as much as a delivery measure. A build that runs long loses money quietly in supervision and site costs the estimate never allowed for.
Defect rate
The volume and severity of defects found at handover and through the defects liability period. It measures the real quality of the delivered product and the cost of putting it right, and a rising defect rate usually points back to a quality-assurance process that is not catching problems while they are cheap to fix.
Supervisor capacity
How many active jobs a supervisor is carrying against how many they can run well. Push a supervisor past their real capacity and quality, programme and safety all slip at once, so this measure is often the true limit on how much work a builder can take, well before cash or trades become the constraint.
Revenue per employee
Total revenue divided by headcount, a rough read on how efficiently the business converts people into delivered work. It is most useful watched over time and against the builder’s own history rather than compared to others, because what counts as normal varies with build type and how much work is subcontracted.
04 / The system
Reading the measures together
The measures are most useful read together, because each explains the others. A slipping forecast margin is the result; a long build time, a high defect rate or an overloaded supervisor is often the cause. Watching only the financial measures means seeing the problem after it has already cost money, while watching the operational measures alongside them gives a builder the chance to act before the cost lands.
This is why a building business cannot be run off a single dashboard number. The value is in the relationships, a delay that becomes a preliminaries cost that becomes a margin drop, a selection made late that becomes a variation that becomes a claim. The measures are the visible surface of the connected system described in financial visibility, and they are only as honest as the data feeding them, which is why capturing real costs and real progress as the job runs is the precondition for any of these numbers being worth watching.
05 / Common mistakes
How KPIs get misused
Most KPI programmes fail not because the wrong measures were chosen but because they were read the wrong way, as totals rather than trends, or as reports rather than as someone’s job to move. These are the common ways the measures stop being useful.
Watching totals, not movement
A report that shows costs to date but not the change since last week describes where the job has been, not where it is going. The useful signal is almost always in the movement, a margin that dropped a point this fortnight, not the absolute number.
Only lagging measures
Measuring gross margin at close-out tells a builder whether a finished job made money, which is too late to change anything. The measures that help are the leading ones, committed cost and forecast margin, that move while decisions can still be made.
KPIs no one owns
A number that appears in a monthly report but is nobody’s job to move is decoration. Each measure that matters should sit with the role that can actually influence it, forecast margin with the person running the job, cash conversion with accounts.
Borrowed benchmarks
Adopting a target margin or build time from a podcast or a peer without checking it against the business’s own history. A meaningful target comes from a builder’s own recorded performance, which is why capturing real job data is the precondition for any KPI being worth watching.
06 / FAQ
Common questions.
Forecast margin, job by job. It is the single measure that combines cost, commitment and progress into one live number, and it moves while there is still time to act on it. Gross and net margin matter enormously, but measured at close-out they are a post-mortem. Forecast margin, updated as commitments are raised and progress is recorded, is the closest thing a builder has to an early warning system, because it turns a slow fade into a visible trend rather than a nasty surprise at handover. Everything else, cash conversion, build time, defect rate, tends to show up in the forecast margin eventually anyway.
Because a building business is always mid-flight across many jobs at once, and the absolute value of a measure at a single moment says little without direction. A forecast margin of a certain level might be fine or alarming depending on whether it is holding steady or has dropped two points in a fortnight. Reading movement turns a static report into a signal, it tells you which jobs are drifting and how fast, so attention goes where the trend is bad rather than where the total happens to be large. This is the core idea behind good job cost reporting, that the change since last review beats the totals.
With caution. Published benchmarks are useful for orientation, but a target that actually means something comes from a builder’s own recorded history, the margins, build times and defect rates the business has genuinely achieved, adjusted for the work it does. A custom builder and a project-home builder have structurally different numbers, and borrowing a figure from the wrong context sets a target that is either trivially easy or impossible. The more valuable exercise is to measure the business honestly for long enough to know its own real numbers, then set targets against those. Any specific figures should be treated as needing verification against the builder’s own data.
They are the same story told in two languages. A blown build time shows up as eroded preliminaries and a lower forecast margin. A high defect rate shows up as rework cost and slower cash conversion. Overloaded supervisor capacity shows up as both, slipped programmes and quality problems that cost money. The operational measures are usually the leading indicators and the financial ones the lagging results, which is why watching only the financial KPIs means seeing problems after they have already cost you. The connection between them is the reason a building business has to be read as one system rather than a set of separate numbers.
07 / Keep reading
Related knowledge, guides and features
Watch the numbers while you can still change them.
VIABUILD builds forecast margin, WIP and cash position from live job data, so the measures move as the job moves and a fade shows up as a trend, not a surprise at handover.