Choosing the right building company for your Kent home project can feel overwhelming. Whether you’re planning an extension in Hastings, a loft conversion in Bexhill on Sea, or a complete renovation anywhere across the county, making the wrong choice could cost you thousands, and months of stress.
The good news? Most cowboy builders and unreliable construction companies in Kent UK show clear warning signs early on. By knowing what to look for, you can protect yourself, your property, and your wallet from costly mistakes.
Here are five critical red flags that should make you think twice before hiring any building company.
Red Flag 1: No Proper Licensing, Insurance, or Credentials
This is the biggest warning sign of all. Any reputable building company should be able to provide proof of proper licensing and comprehensive insurance coverage without hesitation.
What to ask for:
- Valid public liability insurance (minimum £2 million coverage)
- Employer’s liability insurance
- Professional indemnity insurance
- Relevant trade certifications and qualifications
If a builder seems vague about their credentials, makes excuses, or tells you “insurance isn’t really necessary for this type of work,” walk away immediately. Without proper coverage, you could be held responsible for accidents on your property, substandard work, or damage to neighboring properties.
Legitimate building companies in Kent will also be registered with professional bodies like the Federation of Master Builders (FMB), the National Federation of Builders, or similar trade organizations. These memberships aren’t just for show, they provide additional protection and recourse if things go wrong.
Pro tip: Always verify insurance details directly with the insurance company. Don’t just take a photo of a certificate as proof, scammers can easily fake these documents.
Red Flag 2: Vague Quotes and Reluctance to Detail Costs
Professional builders provide detailed, itemized quotes that break down exactly what you’re paying for. If someone gives you a rough figure scribbled on the back of an envelope or refuses to put their quote in writing, that’s a major red flag.
Watch out for:
- Verbal quotes only
- Estimates that seem too good to be true
- Reluctance to specify materials, labor costs, or timelines
- Vague descriptions like “all materials included” without specifics
- No clear payment schedule
A proper quote should include material specifications, labor costs, project timeline, waste disposal fees, and any potential additional costs. It should also clearly state what happens if you want to make changes during the project.
Remember, if builders in Hastings or elsewhere in Kent are giving you wildly different quotes for the same work, there’s usually a reason. The cheapest quote often comes with hidden costs, inferior materials, or corner-cutting that will cost you more in the long run.
Red flag example: “We’ll do your extension for £15,000 all-in, materials included. Don’t worry about the details, we’ll sort everything out as we go.”
Red Flag 3: High-Pressure Sales Tactics and Demands for Immediate Decisions
Reputable construction companies understand that hiring builders is a significant decision that requires careful consideration. They won’t pressure you into signing contracts on the spot or demand immediate answers.
Warning signs include:
- “This price is only valid if you sign today”
- Turning up at your door unexpectedly with special offers
- Refusing to give you time to think or get other quotes
- Demanding large upfront payments or full payment before starting work
- Insisting on cash-only payments
Professional building companies in Kent will give you time to review contracts, compare quotes, and make informed decisions. They understand that trust takes time to build, especially when you’re inviting contractors into your home.
The cash red flag: Be particularly wary of any builder who insists on cash payments, especially large amounts upfront. Legitimate businesses accept bank transfers, cheques, and card payments, all of which create a paper trail for your protection.
Red Flag 4: Poor Communication and Unprofessional Behavior
How a building company communicates with you during the quoting process is usually a good indicator of how they’ll behave during your project. Poor communication early on rarely improves once work begins.
Watch for these warning signs:
- Consistently late for appointments or no-shows without explanation
- Unreliable phone contact or slow response to emails
- Unable to provide a clear project timeline
- Vague about their process or methodology
- Can’t provide recent references from satisfied customers
- Poor presentation or unprofessional appearance
Good builders in Bexhill on Sea and across Kent maintain regular contact, provide updates on progress, and are easy to reach when you have questions or concerns. They should also be knowledgeable about local planning requirements and building regulations.
Communication test: Pay attention to how quickly and thoroughly they respond to your initial enquiry. If they’re hard to pin down before they have your money, imagine how difficult they’ll be to contact when problems arise.
Red Flag 5: Unwillingness to Provide Written Contracts
Never, ever proceed with building work without a proper written contract. Any builder who tells you a contract isn’t necessary, or who tries to start work based on a handshake agreement, is setting you up for potential disaster.
A proper contract should include:
- Detailed scope of work and materials specifications
- Clear timeline with key milestones
- Payment schedule tied to work completion
- Change order procedures
- Warranty information
- Dispute resolution process
- Health and safety responsibilities
Some unscrupulous builders avoid contracts because it makes it easier for them to change prices, use inferior materials, or walk away from projects. A written contract protects both parties and ensures everyone understands their responsibilities.
Contract red flag: “Don’t worry about all that paperwork: we prefer to keep things simple and just get on with the job.”
Additional Warning Signs to Consider
Beyond these five major red flags, here are some other warning signs that should make you cautious:
Door-to-door solicitation: Reputable construction companies rarely need to knock on doors looking for work. Be especially wary of anyone claiming they’re “working in the area” and noticed problems with your roof or driveway.
No fixed business address: Builders operating from mobile phones only, without a proper business address or website, can disappear easily if problems arise.
Suggesting you skip planning permission: Any builder who suggests avoiding proper planning permission or building regulations approval to “save time and money” is putting you at legal risk.

No portfolio or previous work examples: Professional building companies are proud of their work and should be able to show you examples of recent projects, ideally with customer testimonials.
Making the Right Choice
Finding reliable building companies in Kent doesn’t have to be a gamble. Take time to research potential contractors thoroughly, get multiple detailed quotes, and trust your instincts about their professionalism and communication style.
Remember, the cheapest quote is rarely the best value. Focus on finding builders who demonstrate professionalism, transparency, and expertise in their field. A slightly higher upfront cost from a reputable company will usually save you money and stress in the long run.
Before making your final decision, visit some of their recent projects if possible, speak to previous customers, and ensure all documentation is in order. The extra effort you put in during the selection process will pay dividends when your project runs smoothly and delivers the results you want.
Your home is likely your biggest investment: make sure you protect it by choosing the right building partner from the start.






