Retention costs you twice

Retention Calculator

Five per cent held on a £120,000 contract costs about £1,410 once the wait and the share that never arrives are counted.

Free tool

Retention Calculator

Retention costs you twice. Once for the wait, and again for the share that never comes back. Only the first one is obvious, and neither is usually in the price.

The contract
£
%
Usually 3 to 5 per cent.
%
To show the cost against what you make.
When it comes back
Practical completion.
End of the defects period.
%
Overdraft or invoice finance, a year.
%
Be honest. Look at last year's ledger.
What the retention costs

-

Retention held
Average wait
Never recovered
Cost of financing the rest

Profit on the job
Retention eats this much of it
Margin after the retention costs
Add this to the quote to cover it

Three things worth knowing

The uplift needed to cover retention is grossed up, because the extra you add gets retained too. Adding the bare cost leaves you slightly short.

A retention bond costs a fee and releases the cash. Compare the fee against the figure above before assuming a bond is the expensive option.

The share never recovered is the number people guess at. Look at what you actually wrote off last year rather than what you feel it should be.

The same sum, in a workbook

With the margin before and after, and the grossed up uplift to put on the quote.

Download the workbook Free Excel workbook, no signup. Current for 2026/27.

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