The way you pay a contractor decides who carries the risk on your project. Pay too much too early and the leverage shifts entirely to the builder — you are now the one hoping the work gets finished, because the money is already gone. Pay correctly, in step with the work, and you keep the one lever that reliably gets a job completed to standard: the next payment is always still in your pocket. The build quality matters, but the payment schedule is what protects you if it goes wrong.
The takeaway up front: never let payment run ahead of completed work. Keep the deposit modest, release each payment only against a milestone you can actually see and verify, and hold back a final slice — retention — until the defects are fixed. A contractor who is comfortable being paid for work already done is showing you something important about how they run their business. One who needs large sums up front is showing you something too.
Why the payment schedule is the real contract
Two contractors can quote the same price and offer completely different risk. The difference is buried in the payment terms. A schedule that asks for 50 percent on signing and the balance on the first day of work has quietly transferred almost all the risk to you before a single wall is touched. A schedule that ties money to progress keeps you and the contractor pulling in the same direction the whole way through.
This is why the payment schedule deserves as much scrutiny as the headline number — and why it belongs in a written contract, not a verbal understanding. Before you get here you should already have vetted the contractor properly and compared bids on a like-for-like basis; if you have not, start with our guides on hiring a general contractor and comparing contractor quotes. Payment terms are the last thing you agree, and the hardest to renegotiate once work has begun.
The deposit: enough to commit, not enough to fund the job
A deposit is normal and reasonable. Contractors order materials, book crews, and turn down other work to hold your slot, and asking them to carry all of that unpaid is neither fair nor realistic. The question is not whether to pay a deposit but how much.
A modest deposit — commonly in the region of 10 to 20 percent of the contract value — covers a contractor's genuine up-front commitment without funding the whole project on trust. The exact figure varies with the size of the job and how much bespoke material has to be ordered early; a kitchen full of custom cabinetry legitimately needs more up front than a straightforward repaint. What should make you pause is a demand for a large deposit — a third, a half, or more — with a thin justification. The most common reason a contractor needs a big deposit is that they are using your money to finish someone else's job, which means the next client's deposit will be finishing yours. That is a cash-flow warning sign, not a business model you want to be part of.
Where a lot of material genuinely must be bought early, a fair alternative is to pay the supplier directly, or to release a specific material payment against invoices, rather than handing over a lump sum the contractor controls.
Progress payments: pay for work you can see
The core of a good schedule is a series of progress payments, each released when the project reaches a defined, verifiable milestone. The point of a milestone is that anyone can look at the site and agree it has been reached. "Foundations poured and cured." "Structure up and weathertight." "First-fix plumbing and electrics complete." "Plastering finished." Each is a physical fact, not an opinion.
A workable payment schedule for a typical build might look like this:
- Deposit on signing — a modest percentage to secure the booking and early materials.
- Milestone payments — several releases tied to completed stages, each a defined share of the contract.
- Substantial completion — the bulk of the balance when the work is finished and usable, but before the final sign-off.
- Retention release — the last slice, held back and paid once defects are cleared.
Two rules make this work. First, the payment always follows the milestone — you inspect, confirm the stage is genuinely complete, then pay. Paying for a milestone that is "nearly there" quietly puts you back in the funding-ahead-of-work trap. Second, the value released should never exceed the value of work actually in place. If you have paid 60 percent but only 40 percent of the job is built, you are exposed for the difference if the contractor walks or fails.
Retention: the leverage that gets defects fixed
Retention (sometimes called a holdback) is a small percentage — often around 5 percent — kept back from what you owe even after the work looks finished. You release it only once the snag list is cleared and any defects that surfaced in early use have been put right. It exists because the last 5 percent of a job is where motivation traditionally collapses: the contractor has been paid for the visible work and the fiddly final fixes are easy to keep postponing.
Holding retention keeps a reason to come back. It should be a defined term in the contract — how much, what triggers its release, and a clear end date so it cannot be withheld unreasonably either. Retention is not about squeezing the contractor; a fair holdback protects both sides by making the finish line explicit.
Never pay for extras on a handshake
Mid-project, someone will suggest a change — a better tile, a moved doorway, an extra socket. The moment money attaches to that conversation, it stops being a chat and becomes a variation to the contract. Agree the cost in writing before the work happens, and fold it into the payment schedule rather than settling it in cash on the side. Uncontrolled extras are one of the most common ways a fixed-price job quietly balloons; our guide to controlling change orders covers the discipline that keeps them in check. The principle is the same as the rest of the schedule: no payment without a defined, agreed piece of work behind it.
Payment red flags worth walking away over
Certain payment behaviours reliably predict trouble. Treat these as signals, not certainties — but take them seriously:
- A demand for full or near-full payment up front. No legitimate contractor needs the whole sum before working.
- Cash-only, no receipts, no written schedule. This removes your paper trail and often your legal protection, and can signal an uninsured or unlicensed operator.
- Pressure to pay ahead of the milestone "to keep things moving." The schedule exists precisely so momentum is never a reason to pay early.
- Deposits that keep growing as new "urgent" material needs appear. Genuine material costs can be paid to suppliers directly against invoices.
- Resistance to any retention at all. A confident contractor expects to earn the final payment by finishing properly.
None of these alone proves bad faith. Together, or delivered with pressure, they are a reason to slow down, get everything in writing, or choose a different contractor.
Frequently asked questions
How much deposit should I pay a contractor?
A deposit in the region of 10 to 20 percent of the contract value is common and reasonable for most jobs, scaling up only where a lot of bespoke material must be ordered early. Be cautious with any demand for a third, a half, or more up front — a large deposit often means the contractor is funding another job with your money, which is a cash-flow risk rather than a normal business practice.
What is a construction retention or holdback?
Retention is a small percentage — often around 5 percent — kept back from the total even after the work appears finished, and released only once the defects and snag list are cleared. It gives the contractor a concrete reason to return and complete the fiddly final fixes that motivation otherwise tends to abandon. Agree the amount, the trigger for release, and an end date in the written contract.
Should I ever pay a contractor in full before the work is done?
No. Paying in full ahead of completion removes your only reliable leverage to get the job finished to standard, and leaves you exposed if the contractor fails or walks. Tie every payment to a completed, verifiable milestone so the money in your pocket always roughly matches the work still to do.
What if the contractor asks for more money mid-project?
Legitimate extra costs come from agreed changes or genuine unforeseen conditions, and they should be priced and agreed in writing before the work proceeds, then added to the payment schedule. Be wary of vague requests for more money to "keep going" with no defined work attached — that is a warning sign, not a normal request.
Next step
Before you sign anything, write the payment schedule down and read it as carefully as the price. Keep the deposit modest, tie every release to a milestone you can stand on site and verify, hold a retention to the end, and put every mid-project extra in writing before it is built. A contractor who is comfortable being paid for completed work is the one most likely to complete it well — and where the sums are large or the contract terms unfamiliar, have a solicitor or quantity surveyor review the payment terms before you commit the money.
