Where Is Your Margin
Actually Going?

How Margin Fade Works in Construction

Margin fade is the gap between the margin you priced a job at and the margin it actually delivers. As a worked example, on a £2.5m contract priced at a 20% margin, a fade of 5 percentage points is £125,000 of profit gone. Across several live jobs it adds up quickly.

It is rarely one big overrun. It is usually lots of small ones: material prices creeping up, labour taking longer than allowed, extra work that never became a priced variation, subcontractor contra-charges, and overheads under-allowed at tender.

Why Most Contractors Don't Catch It Early

Traditional job costing looks backwards: it tells you what you have spent. Margin fade is about direction. You need to project where costs are heading at the current rate, not just where they have been. That is what this calculator does: it takes your actual costs to date, your percentage complete and your original budget, then projects the estimate at completion (EAC) to show the margin you are on course to make.

The Cost Categories to Watch

Labour is a common source of fade, because productivity assumptions made at tender often do not survive weather, rework and overtime. Materials can move sharply between tender and purchase on jobs heavy in commodities.

Subcontractors are often under-managed on cost: contra-charges, scope disputes and variations that slip through all erode margin. Overheads (site management, insurance, plant and preliminaries) are frequently under-allowed at tender.

What to Do When You Find Margin Fade

First, it is fixable if you catch it early. Build a proper work-in-progress (WIP) schedule that sets costs to date against the estimated cost to complete for every live job. That gives you a realistic picture of projected profit rather than the optimistic one in the project manager's head.

Second, look at the category breakdown. If labour is the main source of fade, the fix is operational: crew planning, programme and rework. If it is materials, look at buying and at whether the extra cost can be recovered as a variation.

Third, update the estimate at completion every month. A budget set on tender day says little about a job that has changed since. The EAC should reflect current conditions.

When to Get Help

If you are seeing margin fade on more than one job, the cause is usually in how jobs are priced, tracked or reported, not in one job. That is the point to set up monthly job cost reporting and a WIP schedule. BlackpeakCFO produces monthly management accounts for UK contractors from £295/month, with job costing, WIP, retentions and CIS. See the construction page or a sample construction management accounts pack.