Should You Take a Deposit on Plumbing Jobs?

Taking a deposit before starting a plumbing job serves three purposes: it covers your materials cost, it commits the customer to the booking, and it reduces your financial exposure if the relationship goes wrong.

Consider a typical boiler replacement: materials cost £700–£1,500 before you've started. If you buy the boiler, install it, and the customer then disputes the price or simply refuses to pay, you're significantly out of pocket on materials alone. A deposit of 30–40% of the total job value covers this exposure.

Deposits also filter out uncommitted enquiries. A customer who won't pay a deposit before a significant job is either not serious about proceeding or has concerns about your credibility. The booking deposit is a mutual commitment — you're committing your time; they're committing their intention to proceed.

The fear that asking for a deposit will cost you jobs is largely unfounded. For any job over £500, deposits are standard practice across the UK trades, and most homeowners expect to pay one. The customers who object most strongly are sometimes the ones most likely to cause payment problems later.

Not every job requires a deposit. A rough guide:

• Callout repairs and small jobs (under £200): No deposit needed. Payment on completion is standard.
• Medium jobs (£200–£500): Optional. If materials are expensive relative to labour, a deposit to cover materials is reasonable.
• Large jobs (£500–£2,000+): Yes. 25–40% deposit before starting. Cover materials and confirm the booking.
• Major projects (£2,000+): Yes, with staged payments. Deposit on confirmation, milestone payments during the work, balance on completion.
• Special-order or non-returnable materials: Always take a deposit before ordering — at minimum the full cost of the materials.

The threshold for requiring a deposit should be based on your financial exposure, not a round number. If a job requires you to buy £300 of materials before starting, take at least that in deposit regardless of total job value.

UK industry norms for deposit amounts:

• Standard deposit: 25–40% of total job value. This covers materials cost with a buffer.
• Special-order items: 50–100% of the item's cost. If you're ordering a specific boiler model or bespoke sanitaryware, cover the full cost.
• Very large projects: Staged payment schedule rather than a single deposit. Example for a £10,000 bathroom: 30% on confirmation (£3,000), 30% on first-fix completion (£3,000), 40% on completion (£4,000). This protects you throughout the project.

Frame the deposit as normal practice, not as distrust. "I require a deposit to cover materials before I start — this is standard for all my jobs above [£X]." This removes the personal dynamic and presents it as a business policy.

Some customers will push back on deposits. Here's how to handle the most common objections:

"I've never been asked for a deposit before"

Response: "It's quite standard practice for jobs of this size. I need to order materials before I can start, and the deposit covers that cost. I appreciate it's an additional step but it's how I run my business."

"How do I know you'll turn up?"

Response: "That's a fair question — I'd suggest checking my reviews on [Google/Checkatrade]. My deposit policy actually works both ways — once you've paid a deposit, I'm committed to the booking date."

"Can I pay everything on completion?"

Response: "For smaller jobs I'm happy to do that, but for a job this size I need to order materials and schedule my team. A deposit commits both of us to the booking." If they still refuse, consider whether you want this customer.

A customer who absolutely refuses to pay a deposit for a significant job is a warning sign. In my experience, the customers who make the biggest fuss about deposits are disproportionately likely to cause payment problems later.

A deposit should be a mutual protection, not just yours. Make your deposit policy explicit in your quote and terms:

• State what the deposit covers (materials purchase, booking confirmation)
• State the deposit amount and when it's due
• State what happens if the customer cancels (typically the deposit is forfeit if cancellation is less than 48 hours before the start date; the balance is refundable for earlier cancellation)
• State what happens if you cancel (you return the deposit)

A clear, fair deposit policy reassures customers that they're protected as well. The rare customer who has been stung by a plumber taking a deposit and not showing up will feel much better seeing a written policy that includes refund provisions.