INVESTMENT & BUSINESS TOOLS

Should You Take That Contract? A Small Contractor's Guide to Bid Pricing and Cash Flow Risk

A contract can be genuinely profitable on paper and still be the wrong job to take — because profit and cash flow are two different problems, and only one of them shows up in a simple markup calculation.

Most small contractors price a job the same way: add up materials and labour, add a markup, quote it. That approach catches whether a job is profitable. It doesn't catch whether you can actually afford to run it — and that second question is what actually puts small contracting businesses under, even on jobs that would have been profitable if they'd survived to the final payment.

Step one: build the price properly, not just "cost plus markup"

A defensible tender price is built in layers, each applied to the running total, not simply added up separately:

• Direct cost — your actual labour, materials, and equipment cost for the work itself.
• + Indirect costs — site supervision, temporary facilities, mobilisation — costs the job needs but that aren't tied to one specific task.
• + Overhead — your share of running the business itself: an office, admin time, insurance, vehicles.
• + Contingency — a deliberate allowance for the unknowns every real job has, sized to how well-defined the scope actually is. A renovation with unknowns behind existing walls warrants a meaningfully higher contingency than a straightforward, well-documented new build.
• + Profit — applied last, on top of everything above it.

Skip any one of these layers — most commonly overhead or contingency — and the number you quote looks competitive right up until the job reveals what it actually costs to run.

Step two: the question that actually matters — can you afford to carry it?

Here's the part most informal pricing misses entirely. Most contracts — especially anything formally administered — withhold a percentage of every payment as retention (sometimes called holdback), released only after the job is finished and signed off. That money is real, and it's not available to you while the job is running, even though you've already spent real cash on labour and materials to earn it.

This creates a genuine cash flow gap that has nothing to do with whether the job is profitable: you can be paying subcontractors and suppliers faster than retention lets you get paid back, and a contract can fail from a cash shortage in month three, even though it would have shown a healthy profit in month twelve.

Before taking any sizeable contract, the honest question is: if 10% of every payment is withheld until completion, do I have enough working capital to cover labour and materials in the meantime — or am I betting the job finishes fast enough that it doesn't matter?

A quick way to check both, before you sign anything

Rather than working this out on the back of an envelope, our free Investment & Project Valuation Calculator has a Construction Project mode built for exactly this: enter your direct cost, set your indirect cost, overhead, contingency, and profit percentages, and it builds the defensible tender price automatically. Then enter your retention percentage and your actual available working capital, and it gives you a straight go / caution / no-go verdict on whether you can genuinely afford to carry the job — not just profit from it eventually.

The bottom line

A contract that's profitable but uncarriable isn't actually a good contract — it's a cash flow risk wearing a profitable-looking quote. Pricing the work correctly and checking the cash requirement are two separate steps, and skipping the second one is one of the most common, avoidable reasons a genuinely capable small contractor gets into real trouble on a job that should have gone fine.