How Much Deposit Should You Pay a Builder in the UK?

If you are about to agree building work, one of the hardest questions is simple: how much deposit should you pay a builder in the UK? Pay too little and a good builder may not be willing to hold your start date or order materials. Pay too much and you could be exposed if the work is delayed, the builder disappears, or the specification changes before the job starts.

There is no single legal deposit percentage that applies to every building job. The right amount depends on the size of the project, whether materials need to be ordered in advance, how established the builder is, and how the payment plan is written into the quotation or contract.

This guide explains what a sensible deposit looks like, when a higher upfront payment may be reasonable, and the warning signs that should make you pause before transferring money.

Common mistakes

Paying a large deposit before anything is written down. A verbal agreement is not enough. Before paying any deposit, you should have a written quotation or contract showing the scope of work, total price, payment terms, start date or estimated start window, and what happens if either side cancels. If the builder asks for money first and says paperwork will follow, treat that as a warning sign.

Confusing a deposit with the first stage payment. A deposit is normally paid to secure the booking or cover initial ordering. A stage payment is paid after a defined part of the job has been completed or materials have been delivered. Homeowners often hand over a deposit that is really a large first stage payment, but without any matching progress on site.

Paying for materials without proof they have been ordered or delivered. Some jobs genuinely require upfront material payments, especially where items are bespoke, made to measure, or non-returnable. But you should know exactly what you are paying for. Ask for supplier quotes, order confirmations, delivery dates, and confirmation of who owns the materials once paid for.

Agreeing to vague payment milestones. Terms such as “payment as we go” or “balance during works” can lead to disputes. A good payment schedule should say what triggers each payment, for example: completion of demolition, completion of first fix, delivery of kitchen units, or practical completion. Avoid paying simply because a builder says they need cash flow.

Not keeping enough money back until completion. If you pay almost everything before snagging, you lose leverage to have defects put right. A final payment should be due only when the agreed works are complete, the site is left in a reasonable condition, and any obvious snagging items have been addressed or documented.

Using cash to get a cheaper price. Paying cash may feel like a saving, but it can leave you with poor evidence if something goes wrong. Bank transfer is usually cleaner because it creates a record. If you do pay any amount in cash, insist on a dated receipt stating what the money was for.

Real examples

Example 1: a small internal repair job

Imagine a builder quotes £1,800 to remove a damaged internal wall section, repair plasterboard, make good, and decorate. Materials are modest and easy to obtain. In this situation, a request for £900 upfront would be difficult to justify because half the job value is being paid before work starts.

A more balanced arrangement might be a small booking deposit, for example £150 to £250, with the balance paid on completion. Alternatively, no deposit at all may be reasonable if the builder is local, the job is short, and the materials are standard. The key point is proportionality: the deposit should reflect the builder’s real upfront risk, not simply improve their cash flow.

Example 2: a bathroom refurbishment with ordered items

Suppose a bathroom refurbishment is quoted at £7,600, including labour, plumbing alterations, tiling, a vanity unit, shower screen and suite. The builder asks for £2,500 before starting. That may or may not be reasonable, depending on what it covers.

If £1,800 of that is for specific sanitaryware and tiles that you have selected, you should ask for a breakdown: supplier, product names, quantities, delivery date and whether the items will be delivered to your home or held by the builder. A safer arrangement might be £1,000 deposit on signing, then payment for the bathroom items when order confirmations are provided, then staged labour payments as the work progresses.

Example 3: an extension with staged payments

For a larger project, imagine a single-storey extension quoted at £68,000. A builder asks for £13,600 upfront, described as a 20% deposit. That is a significant amount to pay before work begins, particularly if there is no evidence that materials of that value need to be purchased immediately.

A more controlled payment schedule could look like this: a modest deposit to reserve the slot and cover early administration, a payment when groundworks are completed, another when foundations are signed off or ready for inspection, another at wall plate level, another after roof structure and covering, and further payments after first fix, plastering, and practical completion. The figures do not have to be identical, but each should be tied to visible progress or specific materials.

What to do instead

1. Ask what the deposit is for. A good builder should be able to explain whether the money secures your start date, pays for design time, covers skip permits, orders materials, or protects them against cancellation.

2. Separate labour deposits from material payments. If materials are the reason for a higher upfront amount, ask for a material schedule. For bespoke or non-refundable items, confirm the exact product, supplier and delivery address.

3. Keep the deposit proportionate. There is no fixed rule, but for many straightforward domestic jobs a small fixed sum or a modest percentage is easier to justify than a large upfront payment. The larger the project, the more important it is to use stage payments rather than one large deposit.

4. Use a written quotation or contract. It should identify the builder, your address, the scope of work, VAT position if applicable, exclusions, payment dates, and cancellation terms. If you are unsure whether a quotation is clear enough, you can upload it for a free Quote Health Check.

5. Avoid paying the full cost of materials into a builder’s account without evidence. Where possible, pay the supplier directly, have the goods delivered to your property, or ensure the contract states that materials paid for by you belong to you.

6. Link payments to progress. Each payment should correspond to something objective: a completed stage, delivered materials, or an agreed inspection point. Avoid dates alone, because a date can arrive even if the work has not progressed.

7. Hold back a final payment. Agree that the final balance is payable after completion and snagging. This does not mean withholding money unfairly; it means paying when the job described in the quotation has actually been delivered.

8. Keep records. Save the quotation, messages, invoices, receipts, photos, bank transfer references and any changes agreed during the job. These records are invaluable if there is a disagreement later.

What is a reasonable builder deposit in the UK?

A reasonable builder deposit is one that reflects genuine upfront costs and risk. It is not automatically reasonable just because it is common in a builder’s paperwork, and it is not automatically unreasonable simply because a builder asks for something upfront.

For a small, short job using standard materials, a builder may need little or no deposit. If they do ask for one, it should usually be modest compared with the total job price. The purpose is often to confirm that you are serious and to protect the builder from turning down other work.

For a medium-sized job, such as a bathroom, kitchen, roof repair or landscaping project, a deposit may be more understandable. The builder may need to book labour, arrange waste removal, order materials, or reserve subcontractors. Even then, the payment should be explained and documented.

For larger projects, such as extensions or major refurbishments, relying on a large deposit is usually less suitable than a staged payment plan. A staged plan protects both sides. The builder receives regular payments as the project progresses, and you avoid paying too far ahead of the work.

A higher upfront payment can be reasonable where bespoke, made-to-order or non-returnable items are involved. Examples include made-to-measure glazing, custom joinery, specialist stone, or kitchen units ordered specifically for your design. In those cases, the risk is real: if you cancel, the builder may be left with goods that cannot easily be reused. But the higher payment should still be tied to named items, not described vaguely as “materials”.

If two builders quote for the same work and one asks for a far larger upfront sum, do not judge on price alone. Compare the deposit terms, payment schedule, exclusions, and risk. Our other homeowner guides explain how to read quotations more critically before you commit.

Red flags when a builder asks for a deposit

A deposit request becomes more worrying when it is combined with pressure, vagueness or poor paperwork. One red flag is urgency. If a builder says you must transfer money today or lose the slot, take a breath. Good tradespeople are busy, but a genuine booking process should still allow you time to read the quotation and ask questions.

Another red flag is an unusually high deposit with no breakdown. If a builder wants a large sum before attending site, ask them to justify it. “That is how we work” is not enough on its own. You are entitled to know what your money is funding.

Be cautious if the business details are unclear. The quotation should show the trading name, address, phone number, email, and VAT number if VAT is being charged. You should also understand whether you are dealing with a sole trader, limited company or partnership. If the paperwork is thin, consider asking more questions or using our contact page before you sign anything you do not understand.

Cash-only requests are another concern. There may be innocent explanations in some circumstances, but cash makes it harder to prove what was paid and why. If the builder insists on cash, ask for a proper receipt and think carefully about whether the saving is worth the risk.

Also watch for deposits paid into a personal account that does not match the business name, especially if you have not worked with the builder before. This is not always proof of a problem, but it is something to clarify in writing.

Finally, be wary of a builder who refuses to include deposit and payment terms in the quotation. Payment terms are not a minor detail; they are part of the deal.

How to write safer deposit terms into your quotation

You do not need legal language to make deposit terms clearer. Plain English is usually best. The important thing is to remove uncertainty before money changes hands.

A safer clause might say something like: “Deposit of £500 payable on acceptance of quotation to reserve start date and cover initial administration. Further payments to be made only in accordance with the payment schedule below.” That tells both sides what the deposit is for.

If the deposit covers materials, be more specific: “Customer to pay £1,250 for tiles and shower fittings once supplier order confirmation is provided. Materials to be delivered to the customer’s address and remain the customer’s property once paid for.” The wording should match your actual arrangement, but the principle is clear: name the items, name the trigger, and say where the goods will go.

For stage payments, avoid vague terms such as “second payment halfway through”. Halfway through is often a matter of opinion. Use milestones that can be seen or evidenced. For example: completion of strip-out, completion of first fix plumbing, delivery of units, completion of tiling, practical completion.

You should also include what happens if work is delayed. Not every delay is the builder’s fault; weather, hidden defects, late deliveries and changes requested by you can all affect timing. But the contract should not allow indefinite delay after a deposit has been paid. At minimum, ask for an estimated start date and a process for notifying delays.

If a builder gives you a quotation that is strong on the total price but weak on payment terms, ask for it to be revised before accepting. You can also learn more about how KnowMyQuote reviews contractor paperwork on our about page.

Deposit, cancellation and changes: points to clarify

Before paying, ask whether the deposit is refundable and in what circumstances. A deposit may be non-refundable if the builder incurs genuine costs after you accept, but that should be stated clearly. If nothing is written down, disputes often arise later.

If you cancel before the start date, the builder may have lost time, turned away work, or ordered materials. On the other hand, if the builder has not incurred costs and has plenty of time to rebook the slot, keeping a large deposit may be difficult to justify. The fairest position is to agree the cancellation terms upfront.

You should also clarify what happens if the builder cancels or repeatedly delays the start. If you have paid a deposit and the builder cannot start within a reasonable agreed window, you should know whether you can ask for a refund.

Changes during the job need the same discipline. If you add work, upgrade materials or change your mind, ask for a written variation showing the extra cost and whether it affects the payment schedule. Do not let the original deposit arrangement become blurred by a series of informal changes.

Frequently asked questions

Before you sign

The safest answer to “how much deposit should you pay a builder in the UK?” is: pay only what is justified, written down and proportionate. A small deposit can be perfectly reasonable. A large upfront payment with vague wording is a risk.

Before transferring money, make sure the quotation explains the work, the total cost, the deposit, the payment stages, and what happens if plans change. If you have two quotations and one asks for much more upfront, compare the risk as well as the price.

If you would like a second pair of eyes, upload your builder’s quotation for a free Quote Health Check. KnowMyQuote can help you spot unclear payment terms, missing scope, risky deposits and awkward exclusions before you sign.