There is no legal maximum deposit for a building job in the UK: you and the customer agree whatever the contract says, and a paid deposit is enforceable. The working answer is practical, not legal: take enough to cover materials and early costs, keep it proportionate to the job, and put the terms in writing before work starts.
- No UK law caps deposits for building work, the agreed contract governs.
- Common practice runs from a modest percentage on small jobs to staged payments on large ones.
- Take the deposit before ordering materials, as its own invoice.
- Refund terms must be stated up front or disputes follow.
- A paid deposit is also evidence the contract was agreed.
How much deposit can I legally ask for?
The short legal answer: as much as you both agree. UK contract law does not set a percentage cap for building deposits, and unlike some consumer sectors there is no statutory scheme holding trade deposits. What governs the amount:
| Factor | What it means for your quote |
|---|---|
| Contract terms | The deposit is whatever you and the customer agreed. Put the number and its refund terms in writing |
| Proportionality | A deposit wildly out of line with the job invites dispute, even if enforceable |
| Cash-flow need | Enough to cover materials ordered and early labour before the first payment lands |
| Customer type | Main contractors under CIS follow their own payment terms; domestic customers need clearer terms |
The practical ceilings come from the market, not the statute book. Builders commonly take a deposit sized to materials and mobilisation on domestic work, then move to staged payments on anything larger: see how stage payment invoicing works.
What a deposit actually does
A deposit does three jobs at once, which is why it is worth taking even on small jobs:
- Cash flow before commitments. The boiler, the tiles, the scaffold are ordered against the customer’s money, not yours or the merchant’s account.
- Evidence of agreement. A customer who pays a deposit has accepted the quote, which matters if the agreement was by email or text and no contract was signed.
- Commitment. Customers who have paid something upfront cancel less and snag less aggressively.
How to structure deposits by job size
| Job | Usual shape | Why |
|---|---|---|
| Small repairs, call-outs | Payment on completion | A deposit is admin for a one-visit job |
| Medium jobs (bathrooms, small extensions) | Deposit before ordering, balance at completion | Covers the suite, tiles and fittings |
| Large builds and renovations | Deposit, then stage payments | No single invoice ever holds the whole job |
| Materials-heavy jobs | Deposit matched to the order value | You are effectively fronting the merchant’s invoice |
The deposit invoice template shows how to issue the deposit as its own invoice (numbered, dated, with the balance terms on it) so it sits cleanly in your records rather than as an informal bank transfer.
What to write on the quote about the deposit
The deposit terms belong on the quote, agreed before work starts:
- The amount or percentage, and when it is due.
- What it covers, e.g. “deposit covers materials ordered for the job”.
- Refund terms, what happens if the customer cancels after materials are ordered. This is the clause that prevents most deposit disputes.
- The balance schedule, when the rest becomes due.
Without refund terms written down, a cancelled job becomes an argument about whether the deposit was “holding money” or payment for something. Two sentences prevent that.
Protecting yourself on consumer jobs
Domestic customers are consumers, which changes the tone of the protections, theirs and yours:
- Consumer Contracts Regulations give consumers a 14-day cancellation right for contracts agreed away from their premises (door-to-door sales) and for most distance selling, with specific rules about when work can start. For on-site quotes signed at the customer’s home, this can bite. Keep the cancellation terms explicit on the quote.
- Keep the deposit proportionate. A very large deposit on a consumer job is the kind of thing trading standards complaints are built from, even where it is technically enforceable.
- Consider payment schedules instead of one big deposit on large jobs, stages give the customer comfort and you the same protection.
For business-to-business work (subcontracting for a contractor) the deposit question rarely arises; payment follows the contract’s terms and CIS deductions apply on the labour element.
What if the customer won’t pay the deposit?
Usually a signal, not a negotiation:
- If they will not fund materials, they may be shopping your quote or expecting credit. Either way, do not order materials on your account against an unsecured promise.
- Offer stages instead: a materials payment at order, labour on completion. It is the same protection with a different shape.
- A customer who balks at a reasonable deposit and then disputes everything later is the customer the deposit was protecting you from.
When deposits go wrong
Two failure modes, both fixable in advance:
- Job cancelled after ordering. Without written refund terms, you argue about the deposit. With them: “deposit covers materials ordered and is non-refundable once ordered”. The position is clear. State it before the deposit is paid.
- Deposit taken, work never started. If a job genuinely does not go ahead, return what you have not spent. Holding a deposit for work never performed is the fastest route to a small claim and a reputation problem.
FAQ
How much deposit can I legally ask for on a building job?
There is no legal maximum. The deposit is whatever you and the customer agree in the contract. In practice, deposits sized to cover materials and early costs are the norm, with stage payments on larger jobs.
Is a deposit refundable if the customer cancels?
That depends on the terms you wrote before the deposit was paid. State clearly on the quote whether the deposit covers materials ordered and whether any balance is refundable, an unstated position defaults to an argument.
Should I take a deposit on small jobs?
Usually not, payment on completion is simpler for one-visit work. Deposits earn their keep when you are ordering materials or committing labour before payment, like bathrooms and kitchens.
Do CIS deductions apply to deposits?
Deductions apply to payments for labour under the scheme. A deposit covering materials only is not labour; a mixed deposit needs the labour element identified: see the CIS invoice template.
Do consumers have a 14-day cooling-off period?
For contracts concluded away from business premises or at a distance, yes: consumers can generally cancel within 14 days, with rules about starting work early. Put the cancellation terms on your quote so the position is agreed before the deposit is taken.
How do I invoice a deposit?
As its own invoice with a unique number, the amount, what it covers and the balance schedule: see the deposit invoice template for the layout. A paid deposit also evidences that the quote was accepted.
One last thing
The deposit is less about the money than the order: it moves the customer from “thinking about it” to committed before you have spent anything. Take it before the merchant invoice exists, put the refund terms in writing, and the two most common deposit disputes (cancellation and abandonment) never start.