7 Red Flags a Customer Will Be Trouble: A Tradesperson's Guide

The clearest signs a customer will be trouble are haggling before you've quoted, refusing a deposit on a materials-heavy job, a vague brief that keeps changing, a trail of previous tradespeople they've fallen out with, “cash, no paperwork” offers, pressure to start without a written price, and messages at all hours. One on its own isn't fatal; two or three together usually are.

Most customers are reasonable and pay on time. But one bad job can cost you weeks in unpaid invoices, callbacks and arguments. These are the patterns worth spotting before you commit.

1. They haggle before you've even priced the job

A customer who tells you their real budget up front is helpful. One who opens with “What's the best you can do?” before you've looked at the job is telling you price is all that matters. They're likely to haggle again at the invoice and argue over every extra. If you do take the job, quote properly and don't cut your price just to win it; see how to price trade work.

2. They won't pay a deposit on a materials-heavy job

If you're about to buy a kitchen, a boiler or a bathroom suite for someone, a deposit is a reasonable ask. A customer who refuses outright (“We'll sort the money out when it's done”) is asking you to fund their job. Explain once why you take deposits; if they still refuse, think hard about going ahead. Our guide to talking about payment with customers has wording that helps.

3. The brief is vague and keeps changing

“Just make the bathroom look nice” or “we'll decide on the tiles as we go” leads to moving goalposts and arguments about what was included. Push for specifics before you quote, write down what's included and excluded, and price any changes as extras. If they won't commit, price for the uncertainty or walk away. Scope creep is much easier to prevent than to fix.

4. Every previous tradesperson was “useless”

“The last plumber didn't know what he was doing” or “we've had three builders and none of them finished” deserves a careful listen. Sometimes the last tradesperson really was poor. But if a customer has fallen out with several in a row, the common factor may be the customer. Ask what happened, and whether they were paid.

5. They want cash, no paperwork, for a discount

A customer who offers cash in return for “no invoice” and a lower price is asking you to keep the job out of your records. If anything goes wrong you have no paperwork to rely on, and the income has to be declared on your Self Assessment return regardless. Taking cash is fine; doing a job off the books isn't. Issue an invoice and a receipt like you would for any other job.

6. They want you to start immediately without a written price

Genuine emergencies happen, and callouts for a burst pipe or a dead boiler are part of the work. But pressure to start a large, non-urgent job tomorrow without a written quote removes the paperwork that protects you. Even for urgent work, send a short written price, or your callout and hourly rates, before you start.

7. They message at all hours and expect instant replies

A string of texts at 10pm on a Saturday before the job has even started rarely improves once it's under way. Set expectations early, including your working hours and how quickly you'll reply, and see whether they're respected.

Red flags with main contractors

Subcontracting brings its own warning signs:

• No written agreement or purchase order for the work
• Vague answers about payment terms, or terms that keep stretching
• Reluctance to verify you for CIS or to give you payment and deduction statements
• “We’ll pay you when our client pays us”
• A reputation for disputes with other subcontractors

With business customers you also have statutory rights if they pay late: interest at 8% above the Bank of England base rate, plus fixed compensation of £40 to £100 per invoice, under the Late Payment of Commercial Debts (Interest) Act. Our post on getting paid faster explains how to use them.

How to protect yourself

• Always send a written, itemised quote with inclusions, exclusions and payment terms
• Take a deposit when you're buying materials for the job
• Agree extras in writing, with a price, before you do them
• Invoice the day the job finishes, with a specific due date
• Keep messages, photos and documents for every job in one place

A professional quote sets the tone from the first contact. The free estimate generator creates a branded PDF quote in your browser, and the AllSquare app keeps your quotes, invoices and customers on your phone. See our quoting guide for what to include.

How to say no without burning bridges

You don't owe anyone a long explanation. “Thanks for getting in touch. I can't take this one on, but I hope you find someone soon” is enough. Turning down a bad job frees time for a good one. If most of your work is small domestic jobs, as it is for many handymen, gardeners and landscapers, a short phone call before a site visit can help you spot these signs early.