How Much Deposit Should You Pay a Builder UK

You have agreed a price with your builder, the start date is locked in, and now they have asked for a deposit. The question is not whether the request is reasonable – in most cases it is – but how much is appropriate and what protections should be in place before you pay it.

Deposit norms vary across the UK construction industry, and there is no statutory limit on what a builder can ask for. This makes it particularly important to understand what is typical, what should raise concerns, and how to structure the payment so your money is protected.

What is a normal builder deposit in the UK

For most residential renovation projects in the UK – extensions, loft conversions, kitchen refurbishments, bathroom renovations – a deposit of 10% to 15% of the total contract value is considered standard. On a £50,000 extension, that means £5,000 to £7,500.

This percentage has become the accepted norm because it broadly corresponds to the cost of materials needed for the first stage of work, plus a small margin for the builder's mobilisation costs (site setup, skip hire, equipment delivery). It is enough to demonstrate the homeowner's commitment without exposing them to excessive risk.

Some builders ask for a fixed amount rather than a percentage – for example, a flat £2,000 or £5,000 regardless of project size. This can be reasonable on smaller projects but should be evaluated against the total contract value. A £5,000 deposit on a £15,000 bathroom renovation is 33% – which is on the high side.

Deposit amounts that should raise questions

Any deposit request above 20% of the total project value warrants a direct conversation about what the money is for. If the builder can provide a detailed breakdown – for example, £8,000 of bespoke joinery that must be ordered eight weeks in advance, or £6,000 of structural steel with a long lead time – the higher deposit may be justified by genuine material costs.

If the explanation is vague ("we need it to get started" or "it's just how we work"), proceed with caution. A builder who cannot explain where your deposit is going may be relying on incoming deposits to fund work on other clients' projects. This is not sustainable, and you do not want to be the homeowner left holding the bill when the cycle breaks.

Deposits of 30% or more with no material-cost justification are a significant red flag. At that level, you should seriously consider whether this is the right builder for your project, regardless of how good their portfolio or reviews look. Our guide on red flags when hiring a builder covers this in detail.

How to verify what the deposit is actually paying for

Ask your builder to provide an itemised breakdown of the deposit. This should list specific materials, their suppliers, unit costs, and delivery dates. If the deposit includes a labour element, that should be specified separately.

Cross-reference the material costs against the Renopay Quote Analyser or by requesting quotes directly from suppliers. Builders buy materials at trade prices, so their costs will typically be 15–30% below retail, but the overall figures should be in the right ballpark.

For projects where the deposit is funding bespoke or long-lead items (structural glazing, handmade kitchen units, imported stone), ask whether you can pay the supplier directly. This way the builder gets the materials they need, you retain ownership of the goods until they are installed, and the deposit risk is transferred from the builder's bank account to a tangible asset on site.

What your contract should say about deposits

Before paying any deposit, ensure your contract addresses the following points.

The exact deposit amount and what it covers – ideally referencing the itemised breakdown described above. The conditions under which the deposit is refundable – for example, if the builder fails to start work by the agreed date or abandons the project. The payment schedule for the remainder of the project, structured as stage payments tied to completed milestones. And the process for handling disputes about deposit refunds, including any agreed alternative dispute resolution mechanism.

Under the Consumer Rights Act 2015, a builder who takes a deposit and fails to provide the agreed service is in breach of contract, and you are entitled to a remedy. But relying on the Act after the fact is slower and more painful than having clear contract terms that prevent the dispute in the first place.

The escrow alternative to direct deposits

The fundamental problem with deposits is that the money leaves your control before the work begins. Once it is in the builder's account, recovery depends on their goodwill, their solvency, and – if those fail – the court system.

Milestone-based escrow services such as Renopay offer a different approach. Instead of transferring the deposit directly to the builder, you place the funds in an FCA-regulated escrow account. The builder has proof that the money exists and is committed to the project. But the funds do not release until the first milestone – the work the deposit was intended to fund – is complete.

This removes the deposit dilemma entirely. The builder has certainty of payment. The homeowner has certainty of protection. Neither side is taking a leap of faith. For homeowners who have read about builders disappearing with deposits and want a structural safeguard against that scenario, escrow is the most robust option available.

What happens if you need to recover a deposit

If you pay a deposit and the project goes wrong – the builder fails to start, delivers substandard work, or abandons the project – recovering that money depends on how it was paid and what your contract says.

For deposits paid by bank transfer directly to the builder, your route is through the courts. Claims up to £10,000 go through the small claims track, which is designed to be accessible without a solicitor. Filing fees range from £35 to £455 depending on the claim value. You will need to demonstrate that the builder breached the contract terms and that you are owed a specific amount.

The challenge is enforcement. Winning a county court judgment does not guarantee payment. If the builder has dissolved their company, moved abroad, or simply has no assets, the judgment may be unenforceable. This is the fundamental weakness of direct deposits – recovery after the fact is difficult even when the law is on your side.

If the builder was a TrustMark registered business, there may be a deposit protection scheme or insurance-backed guarantee that covers some or all of your loss. Always check trade body protections before starting court proceedings, as they are typically faster and less stressful.

The most effective protection against deposit loss is structural: using an escrow service where the funds never enter the builder's account in the first place. If the project does not proceed, the money returns to you without litigation, without enforcement risk, and without delay.

Practical deposit checklist before you pay

Before transferring any deposit to a builder, run through this checklist. Confirm the builder is registered at Companies House and check their filing history. Verify they carry public liability insurance (ask for the certificate, not just their word). Read at least ten independent reviews across Checkatrade, Google, and Houzz. Check their membership of a recognised trade body such as FMB, TrustMark, or BALI. Use the Renopay Risk Checker to assess the overall risk profile of your project.

If everything checks out and you are comfortable with the deposit amount, pay by bank transfer with a clear reference linking the payment to your contract. Keep a copy of the transfer confirmation alongside your contract. And ensure the remaining payments are structured as milestones – so that the deposit is the last unprotected payment you ever need to make on the project.