What Are the Warning Signs of a Bad Builder?
The signs worth taking seriously are about how a builder does business. What they are, what they usually mean, and what to do about them.
The short answer
Watch how they do business. Good builders are easy to check.
The clearest warning signs of a bad builder are about how they do business rather than how they talk: no written quote, pressure to decide on the spot, a request for a large payment before any work starts, cash-only terms, reluctance to show insurance or give references, and contact details that go no further than a mobile number. Any one of these deserves a question. Several together are a good reason to walk away.
It works the other way too. A good builder is usually easy to check, happy to put things in writing and patient with questions. This page sets out the signs, what they tend to mean, and what to do.
Before you agree anything
Six signs worth taking seriously
Each of these is common with builders who turn out to be poor, and rare with builders who turn out to be good.
Pressure to decide now
A price that is only good today, or a start slot that will vanish by tomorrow. Genuine builders give you time to read a quote and compare.
Nothing in writing
A price given verbally, or scribbled on a card, with no description of the work. See what if a builder won't put a quote in writing?
A large payment up front
A modest deposit is normal. A request for most of the price before work starts, or money for materials in cash, is not. See how much deposit should a builder ask for?
Cash only, or a cash discount
Especially a price 'without VAT' for cash. It leaves you with no payment record and raises questions about how the business is run.
No insurance or references to show
Vague answers when you ask for an insurance certificate or the contact details of a past customer.
Hard to pin down
No full name, no business address, no landline or email, a company name that doesn't match anything you can look up.
Doorstep offers
When the builder approaches you
Unsolicited offers deserve extra care. A common pattern is someone who happens to be working nearby, has spotted a problem with your roof or chimney, and can fix it today at a special price. The work may or may not be needed. Either way, you have had no chance to check the builder or compare prices.
The calm response is to thank them, take their details and say you will get other quotes. A genuine builder will accept that. If you do agree to work at your home or away from the builder's business premises, consumer law usually gives you a cancellation period, and Citizens Advice explains when it applies and the exceptions. This is general information, not legal advice.
If you think a trader is behaving dishonestly, you can report it through the Citizens Advice consumer service, which passes information to Trading Standards.
Once work has started
Signs during the job, and good practice to compare them with
Worth raising promptly
- Extra work started without being agreed or priced
- Requests for more money ahead of the agreed stages
- Long unexplained absences from site
- Calls and messages going unanswered for days
- Changes to the materials without discussion
What good practice looks like
- Extras explained, priced and agreed before they are done
- Payments tied to the schedule in the quote
- Warning given when the job has to pause
- Replies within a reasonable time, even if brief
- Changes discussed and confirmed in writing
Good builders can be busy, slow with paperwork or poor at answering the phone. A single sign is a prompt to ask a question, not proof of anything. It is the pattern that tells you most. Our fuller guide, red flags when hiring a builder, looks at each in more depth.
What good looks like
The signs of a builder worth hiring
It helps to know the opposite picture. A builder worth hiring usually gives you a written, itemised quote, asks for a modest deposit with the rest tied to progress or completion, and is happy to be paid by bank transfer. They show you their insurance without being chased, and can put you in touch with a recent customer.
They answer questions directly, including awkward ones, and tell you what they don't know yet. They give you time to decide. They tell you honestly when they can start, even if it is later than you hoped. The contractor checking checklist turns this into a list you can work through.
If you use Mortaro
Standards that are enforced
Contractors in our network were checked before introduction for public liability insurance, reviews and references, the warranties they provide, their trade experience and work history, and their ability to meet our standards. Your quotation is in writing, names your contractor, and asks for a 25% deposit with the balance on completion.
Checking reduces risk; it doesn't remove it. If something goes wrong, we escalate it with your contractor on your behalf, and contractors who fail to put things right are removed from our network. See putting things right.
Straight answers
Questions about warning signs
Is a very low price a warning sign?
It can be. It may mean the builder has left something out or misunderstood the job. Ask them to walk you through it. See is a very cheap quote a bad sign?
What should I do if I have already paid and the builder has gone quiet?
Put your concerns to them in writing, keep copies of everything, and give a reasonable date for a reply. Citizens Advice can explain your options from there. This is general information, not legal advice.
Start here
Tell us about the work you have in mind
We will confirm we cover your postcode, arrange a site visit with a contractor from our network and send you a written quotation. No charge, no obligation.