Deposits and Instalments: How to Pay a Contractor in Stages Without Losing Control

You almost never pay a contractor once. There is a deposit to get the job booked and the materials ordered, then a run of instalments as the work goes on. The sizes and the triggers of those payments are not administrative detail - they are the whole balance of power on the project. Get them right and your money always sits one step behind the work, which is exactly where your leverage lives. Get them wrong and you can end up fully paid for a job that is half done and stalling.

The deposit: what is normal, what is a red flag

A modest deposit is completely normal and reasonable. The contractor has to order materials, hold a slot in their schedule, and cover early costs before any money comes in from you. Somewhere between 10 and 30 per cent of the job is the usual range. Above roughly a third up front, you should want a specific reason - and a request for half the money before anyone has lifted a tool is a red flag to take seriously, not negotiate around.

The instalment models

Once the deposit is paid, the rest is staged. There are three common shapes, and they are not equally safe for you.

• Milestone-based, the one to push for: each payment is released only when a defined stage is complete and you have inspected it - first fix, second fix, completion. Your money tracks the work.
• Calendar or fixed-percentage: set amounts fall due on set dates. Simpler, but weaker, because the dates can drift ahead of the actual progress and leave you overpaid if the job slows.
• Progress valuation, used on larger jobs: the work done is valued periodically, often monthly, and you pay against that valuation, sometimes certified by an architect or surveyor. It is the fairest model for a big project, and the most administrative.

Retention: the money you hold back

On any job worth the effort, hold back a small final slice - commonly around 5 per cent - past practical completion, and release it only after a short defects period once any snags are fixed. Retention is the difference between a contractor who comes back to sort the door that will not close and one who is already on the next site. It is standard practice in professional contracts precisely because it works.

A simple worked example

Take a 40,000 euro bathroom-and-kitchen renovation. A clean, low-risk structure might look like this:

Grouped by country: what is normal where

The underlying structure is the same across Europe, but the local vocabulary and customary deposit differ.

• France: the quote is a devis, the deposit an acompte, and around 30% is customary, with staged payments after. Tie each stage to work done, and check the assurance decennale is in place on structural work.
• Italy: payment runs on the SAL system - stato avanzamento lavori, or state of progress - where instalments are released against certified stages, with a ritenuta (retention) often held back. It is the norm even on modest jobs.
• Spain: a modest senal or anticipo to start, then staged payments (certificaciones on larger works) against progress.
• Germany: part payments, Abschlagszahlungen, against completed work are the legal default under the civil code, you can withhold for defects, and a Sicherheitseinbehalt of around 5% is standard retention.
• UK and Ireland: a materials deposit then staged payments; avoid front-loading, and on a larger job use a standard-form building contract so the stages and retention are written in.
• The Nordics: staged payments against progress under strong consumer-protection rules, with the labour-cost tax deductions affecting how the labour is invoiced - see our guide to renovating in the Nordics.

The best way to do it

The safest structure is a small deposit of 10 to 30 per cent, instalments tied to completed and inspected milestones rather than dates on a calendar, and a retention of around 5 per cent held until a defects period has passed - all written into the contract and paid by traceable transfer to the registered business account. That keeps your money one step behind the work at every point, which is the entire game.

The norm and the industry standard

The norm across Europe is consistent: a modest deposit, staged payments against progress, and a small retention at the end. And the industry standard agrees with it - the standard-form contracts professionals actually use, from Germany's VOB/B to Italy's SAL system to the JCT and RIAI contracts in the UK and Ireland, all encode the same principle of paying for work that is done and holding a little back. A contractor who fights that structure is not offering you a better deal. They are telling you which side of it they expect to benefit from.

This is general guidance rather than financial advice, and the customary deposits and legal defaults vary by country, so confirm the detail locally and put whatever you agree in writing. But keep your payments behind the work, and a staged contract stops being a source of worry and becomes the thing that protects you.