Deposit vs Staged Payments: What's the Difference?

How each one works

Deposit. Paid up front. You have no completed work to show for it, so this is the money most at risk. Keep it proportionate to what genuinely has to be bought early.

Staged payments. Released as the job progresses. Each stage should be something you can see and assess, foundations poured, first fix complete, tiling done. The point is that you are never far ahead of the work.

Retention. Held back until the job is properly finished, snagging included. It is what gives you leverage at the end, when the builder's attention is naturally moving to the next job.

Why the structure matters more than the price

Two builders quote £20,000 for the same extension.

The first wants £10,000 to start and £10,000 on completion. If they walk away at week three, you have paid half for a fraction of the work.

The second wants a smaller deposit for materials, four staged payments against defined points, and a final 10% held until snagging is done. If they walk away at week three, you have paid roughly for what was built.

Same price. Very different exposure.

What good stages look like

• Tied to visible work, not to dates. "When the roof is watertight" is checkable; "at four weeks" is not.
• Roughly matched to effort, so payments track the work rather than front-loading it.
• Written down before starting, with amounts against each.
• Signed off by you before money moves.

Where this goes wrong

The most common failure is not fraud. It is drift, the stages were never written down, the builder asks for money when they need it, and by the time the job stalls you are well ahead of the work without ever having decided to be.

The second most common is releasing the final payment early, usually because the job is nearly done and there is pressure to settle. Once it is paid, the snagging list rarely gets finished.