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Ask any experienced contractor what kills construction businesses and they will not say a lack of work — they will say cash flow. A project can be profitable on paper and still fail because the money arrives later than it goes out. For SME clients, understanding how the cash actually moves — retention, payment applications, valuations — is not accounting trivia. It is the difference between a supply chain that stays solvent and delivers, and one that limps, cuts corners, or collapses mid-project.
How the money actually moves
On most projects the contractor is paid in arrears against progress. Periodically they submit a payment application setting out the value of work done; this is assessed and certified, and payment follows within the periods set by the contract and the Construction Act. Two features catch people out. The first is timing: there is always a lag between doing the work and being paid for it, and the contractor funds that gap. The second is retention — a percentage of each payment held back by the client as security, released in stages, typically half at practical completion and the balance at the end of the defects period.
What retention is really for
Retention exists to give the client leverage: money withheld as an incentive for the contractor to return and fix defects. Used properly it is reasonable. The problem is that retention is one of the most disputed mechanisms in construction — sums are forgotten, release is delayed, and for a small subcontractor the final tranche of retention can be the margin on the whole job. SME clients who treat retention casually damage relationships and, increasingly, invite challenge. The discipline is simple: track it accurately, and release it when it is due.
Where SME clients go wrong
- Assessing valuations carelessly. Certifying too little starves the contractor of cash; certifying too much leaves you overexposed if they fail. Both are dangerous — accuracy protects everyone.
- Missing payment deadlines. The Construction Act sets out strict timescales and notice requirements. Miss a payless notice and you can owe the full applied sum, whether or not the work justifies it.
- Losing track of retention. Not recording what is held and when it is due leads to disputes and, sometimes, paying twice.
- Ignoring supply-chain health. A main contractor sitting on subcontractors’ cash is a risk to your project, not just theirs.
Getting this right depends on knowing where the project truly stands financially, which is exactly what disciplined reporting delivers. The habits behind a good monthly progress report and the cost tracking of earned value management give you the visibility to value work fairly and forecast cash accurately.
The bottom line
Cash flow is the circulatory system of a construction project. Value work accurately, respect the payment timescales, track retention properly, and keep an eye on the financial health of your supply chain. Do that and you protect not just your own position but the delivery of the whole project — because a supply chain that is paid fairly and on time is a supply chain that performs.
Want tighter control of valuations, retention, and cash flow on your project? JC Virtual PMs helps SME clients manage the commercial side with confidence. Get in touch to protect your project’s finances.


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