How much deposit should a builder ask for?

There is no single deposit figure that tells you whether a builder’s request makes sense. A better starting point is to ask what the payment funds, why it is needed now and what written arrangements support it. The purpose matters more than a supposed universal rule.

A builder ordering bespoke materials faces different commitments from someone completing a small repair with readily available supplies. Scope, purchasing arrangements and lead times matter. That does not mean accepting any demand labelled “standard practice”. A deposit deserves the same scrutiny as the rest of the quote.

This guide offers practical questions for UK homeowners. It does not set a legal limit, recommend a fixed percentage or provide legal advice. For disputed terms or your rights in a particular situation, use an appropriate consumer advice service or qualified legal professional.

The short answer

For most home jobs, a deposit is usually a small part of the total — often around 10–25%. It is reasonable for it to be higher only when it pays for made-to-order materials, shown on an order confirmation from the supplier.

• Never pay the full amount up front.
• Pay in stages tied to finished work you can see.
• Paying part by credit card can give extra protection under Section 75 of the Consumer Credit Act for purchases between £100 and £30,000.

This is a general guide, not a legal limit.

Ask what the deposit actually funds

Is the payment intended to reserve a start slot, order materials, secure a specialist booking or fund initial site arrangements? These are different commitments. They should not be bundled into a vague answer that leaves you unable to tell what happens next.

Ask which purchases or bookings follow payment, whether they are specific to your project and when they will be made. Request appropriate order acknowledgements or confirmation. Check what happens if the builder postpones the start or a product is unavailable.

A clear explanation does not eliminate risk, but gives you something concrete to assess. “Everyone pays this” says nothing about why your project requires the payment now. If the explanation remains vague, ask for a written breakdown before committing.

Separate a deposit from progress payments

A deposit is paid before the corresponding work is completed. A stage payment should relate to an agreed point in the project. Confusing these categories can mean repeated advances without a shared understanding of what has been delivered.

Ask for one schedule covering the whole job. Identify the initial payment, subsequent milestones and final payment trigger. Confirm the deposit is credited against the agreed overall total, not an unexplained addition to it. The schedule should match the quotation’s VAT basis too.

A larger extension may need clearly described construction stages. A small repair may suit a simpler arrangement. Avoid “payment when required”: you need the sequence before work begins, not a new negotiation every time a request arrives.

Check the quote is ready to accept

A detailed payment plan cannot rescue unclear work. Before paying, obtain a written quotation naming the trader and describing materials, exclusions, VAT and the final total. Explain how changes and unexpected findings will be agreed and priced.

Confirm responsibilities for approvals, inspections, access and specialist trades. Record start arrangements and dependencies. If a product choice or design remains unresolved, label the figure provisional rather than assuming the headline price includes your eventual selection.

The trader name on the quote, invoice and payment instructions should match, or any difference should be explained and independently checked. Establish whether you are dealing with an individual trader or a company, and keep consistent contact information.

Citizens Advice’s checklist recommends checking quotes, insurance and written arrangements before home-improvement work. That guidance is for England; use the appropriate advice route elsewhere in the UK.

Look closely at advance material orders

Advance buying can make sense for long-lead or made-to-order products. It creates responsibilities that need agreement. Ask what is being ordered, who places the order, where it is delivered and who checks dimensions, damage and missing components.

If goods are stored off site, establish how they are identified for your job and what arrangements cover loss, damage or a delayed start. Ask what the paperwork says about ownership. Seek qualified advice where that affects your decision rather than relying on an informal assurance.

Paying a supplier directly is not automatically safer or cheaper. It may change responsibility for specification, delivery problems, returns and unsuitable products. Agree direct purchasing only after the builder, supplier and you understand who handles each task.

Keep changes in writing. A substituted product or delivery delay can affect both the work programme and the agreed payment trigger. Do not assume the original schedule automatically resolves every new circumstance.

Tie later payments to observable completed work

“Second payment during the build” is hard to assess. A named completed stage, available evidence and agreed reviewer give both parties a more useful reference. The schedule should help you see whether the job and payments move together.

Ask how you will be told a milestone is reached. A walkthrough, photographs or a progress summary may help, depending on the project. For significant technical work, a suitable appointed professional may need to assess progress rather than relying on appearances.

Record unfinished items and agree how they are dealt with before the next payment falls due. An inspection for one purpose does not necessarily confirm workmanship, contractual completion or every commercial obligation. Understand what the evidence actually demonstrates.

For complex projects, independent professional support can help establish appropriate milestones and review arrangements before the builder is appointed. ScopeCheck compares quotation wording; it does not certify work or payment stages.

Pause when urgency prevents checking

Extra scrutiny is sensible when a request is vague or you are pressured to pay before reading the documents. A demand for the entire project amount before work, unexplained bank changes, reluctance to issue receipts or repeated advances outside the schedule are reasons to ask questions.

Those signs do not alone prove dishonesty. They mean the request needs verification. If bank details change, check them through a contact method you already trust rather than only replying to the message containing the new details.

Choose a payment method with a clear record and check any provider protections separately. Do not assume every method offers identical safeguards, or that a receipt proves the underlying contract is complete. Save invoices, acknowledgements and correspondence together.

Discuss delay and cancellation before paying

The arrangement should explain more than what happens when everything runs on time. Ask about postponement, materials already ordered and requests to cancel or reschedule. Agree how changes are communicated and documented.

“Non-refundable” is not a complete explanation of the practical commitments. Ask which costs the payment covers and how the terms deal with different situations. Your circumstances and applicable rights matter; this guide does not determine the enforceability of a particular clause.

The value of asking early is avoiding a surprise after plans change. If the terms remain unclear, seek independent advice before paying, rather than attempting to resolve the meaning under time pressure.

Use a pre-payment checklist

Before sending money, confirm what it funds, that it forms part of the total, and that you have checked the trader’s identity, references and relevant insurance. Check the written work list, start arrangements, payment milestones and VAT basis together.

Make sure responsibilities for products, delays and additional work are understood. Independently verify payment details and obtain an invoice and acknowledgement. Keep the quotation, agreed terms, messages and payment records in one place.

Compare your home-job quotes before choosing a trader. A deposit is easier to assess when connected to specific commitments and a transparent staged-payment plan. If the explanation does not make sense, ask for a revised proposal before paying.