Never fund a client's project from your own pocket.
By Tom Ellis
The number one reason successful trade businesses go bankrupt is not a lack of work; it is poor cash flow management. If you are buying £5,000 worth of boiler parts, timber, or tiles on your own trade credit account before the customer has paid a penny, you are acting as an unsecured bank for a stranger.
Taking a professional deposit is standard business practice. It secures the booking, filters out time-wasters, and ensures you have the capital to buy the initial materials. This guide breaks down exactly how much to ask for, how to structure large project stage payments, and the legal rules you must follow.
How much should you take upfront?
The amount you ask for upfront depends entirely on the ratio of materials to labour, and whether those materials can be returned to the supplier if the job is cancelled.
Standard Work
10% - 20%For minor works like replacing a few radiators, small plastering jobs, or a single day's electrical work. The materials are low-cost or standard stock that can be returned. The deposit simply secures the date in your diary.
Material-Heavy
25% - 33%For bathrooms, kitchens, boiler installations, or landscaping. You have to order tiles, sanitaryware, or skips upfront. The deposit must completely cover your out-of-pocket material expenses on day one.
Bespoke Goods
40% - 50%For made-to-measure bi-fold doors, custom joinery, or bespoke cut granite worktops. If the client cancels, you cannot sell these items to anyone else. Your deposit must guarantee you do not lose money on custom fabrication.
The Consumer Trust Threshold
In the UK, asking for more than 50% upfront on standard jobs is widely viewed as a major red flag by homeowners and Trading Standards. It signals a business lacks working capital. Stick to a strict maximum of 30% unless ordering completely bespoke items.
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Structuring Stage Payments
For large projects like extensions, loft conversions, or full-house rewires, a single deposit is not enough. You must implement a "Stage Payment Schedule" to ensure you are paid periodically as milestones are reached.
The Golden Rules of Milestones
- 1. Visual Milestones: Do not tie payments to vague dates (e.g., "Week 3"). Tie them to undeniable, physical milestones (e.g., "Roof trusses installed and made watertight"). This stops disputes over whether payment is due.
- 2. Stay Ahead of the Debt: The cumulative total of payments received should always be slightly higher than the value of materials used and labour spent on site. If you walk off site, the client should owe you, not the other way around.
- 3. The Final Retention: Always leave a small percentage (usually 5%) for practical completion. This gives the client confidence you will return to fix minor snags, but ensures 95% of your profit is already banked.
Example: £60,000 Extension Payment Schedule
The 14-Day Rule & Deposits
Taking a deposit initiates a contract. If you take that deposit while standing in the customer's home, the Consumer Contracts Regulations mandate a strict 14-day cooling-off period.
If the customer cancels within those 14 days, you must refund their deposit in full, unconditionally. If you have spent that deposit on materials, you will be left out of pocket unless those materials are strictly bespoke. Never order standard materials during the 14-day cooling-off window unless the client has signed a waiver explicitly requesting you start work early.
Credit Cards & Section 75
If you take a deposit via a credit card, the customer gains immense legal protection under Section 75 of the Consumer Credit Act. The credit card company becomes jointly liable for the completion of the work.
If there is a severe dispute (e.g., they claim the job is substandard) or your business ceases trading, the customer can request a "chargeback" from their bank. The bank will often aggressively claw back the entire deposit amount directly from your merchant account while the dispute is investigated. Ensure your contracts and sign-off sheets are absolutely watertight to defend against fraudulent chargebacks.
Frequently Asked Questions
Should I keep deposit money in a separate account?
Yes. Best financial practice is to place customer deposits into a separate business savings account rather than your primary current account. This ring-fences the cash and stops you accidentally spending a customer's deposit on your general overheads (like van fuel or tax bills) before you have purchased their specific materials.
What if a customer refuses to pay a stage payment?
If your contract clearly defines the physical milestone, and you have achieved it, you must stop work immediately. Do not carry on to the next stage "out of goodwill." Issue a formal written notice that work is suspended until the milestone invoice is cleared in full. Continuing to work only increases your financial exposure.
Can I take a non-refundable deposit?
Under UK consumer law, blanket "non-refundable" deposits are often deemed unfair contract terms and are legally unenforceable, especially if you haven't actually incurred any costs. You can only retain a portion of the deposit that genuinely reflects your administrative costs or lost profit resulting directly from the cancellation.
Should I invoice for the materials directly?
Some tradespeople prefer to have the customer buy expensive items (like a boiler or bath) directly from the supplier. This removes your cash flow risk entirely and keeps your turnover below the VAT threshold. However, beware: if the customer buys the materials directly, they hold the warranty, not you, which can complicate matters if the part is faulty out of the box.
How do I ask for a deposit without sounding unprofessional?
Embed it directly into your written quote. Add a clear footer stating: "To secure this booking and arrange material delivery, a 25% deposit is required. Upon receipt, your project dates will be locked into our production schedule." Framing it as a scheduling necessity makes it a standard administrative step rather than a personal plea for cash.
Do commercial clients pay deposits?
Large main contractors and commercial entities notoriously resist paying upfront deposits, preferring strict 30 or 60-day end-of-month payment terms. If you are operating as a subcontractor for a large firm, you will generally have to fund your own materials and submit standard interim valuations. Ensure you have the working capital to survive this before taking commercial contracts.
When should the final invoice be sent?
Immediately upon "Practical Completion" (when the job is finished and ready for its intended use, even if there are minor snags). Do not wait a week to do your paperwork. Hand the final invoice over as you conduct the final walk-around with the customer. Immediate invoicing dramatically reduces the time it takes to get paid.
What is a retention in construction?
In larger projects, a retention is a percentage (usually 3% to 5%) of the total contract value held back by the client after practical completion. It acts as an insurance policy that you will return to fix any defects (snags). Half is usually released upon completion, and the final half is released at the end of the agreed "Defects Liability Period" (often 6 to 12 months later).
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