Top 10 Questions to Ask Your Builder Before Starting an Extension
Embarking on a home extension project is an exciting step, but choosing the right builder is just as important as finalising your design. From budget to timescales, the right questions can uncover a lot—and help prevent costly surprises down the line.
Here are 10 essential questions to ask before your extension begins 🏗️:
1. Are You Fully Insured and Accredited?
Before anything else, confirm your builder holds:
- Public liability insurance
- Employer’s liability (if they have staff)
- Relevant trade body memberships (e.g., FMB, NHBC)
These offer you peace of mind and protection should anything go wrong.
2. Can You Provide References and Examples of Similar Projects?
Don’t just take their word for it—ask for:
- Photos of past work 📸
- Case studies
- References from previous clients you can call
A reputable builder will gladly provide this information.
3. What’s Included (and Not Included) in the Quotation?
Not all quotes are equal. Clarify:
- Does it include VAT?
- Are fixtures, fittings, or materials included?
- Is waste removal or scaffolding part of the cost?
You don’t want hidden extras adding thousands to your build.
4. Will You Handle Planning Permission and Building Control?
Some builders handle all planning applications and inspections, while others expect you to. Make sure:
- You know who’s submitting plans
- They understand current UK building regulations
- They can coordinate with your local council 🏛️
5. What Is the Estimated Timeline—And What Might Cause Delays?
Discuss:
- When can they start?
- How long will it take?
- What might delay progress (weather, supply chain issues, planning sign-offs)?
This sets realistic expectations and helps you plan life around the build.
6. Will I Receive a Contract?
Always request a written contract covering:
- Scope of work
- Payment structure
- Timelines
- Warranty or defects liability period
Verbal agreements alone are risky. Protect yourself with proper documentation.
7. Who Will Be On-Site Daily?
Ask:
- Will it be the same team each day?
- Will a project manager or site foreman be present?
- Who do I speak to with concerns?
Consistency and communication make a huge difference to your experience.
8. How Will You Protect My Home During the Build?
Builders working in lived-in homes should offer:
- Dust protection barriers
- Secure entry points
- Safe zones for families (especially children or pets)
This shows respect for your living space 👷♂️✨
9. What Happens If You Discover Unexpected Issues?
From hidden pipework to rotten joists, surprises happen. Ask:
- How will these be priced and handled?
- Will they notify you before proceeding with extra work?
It’s best to agree a process in writing for handling the unknown.
10. Do You Offer a Guarantee or Aftercare Service?
A builder confident in their work will provide:
- A written guarantee for structural work (commonly 6–10 years)
- Aftercare in the first few months post-build
This adds long-term reassurance 🛠️
Final Thoughts
Choosing the right builder is one of the most crucial decisions you’ll make during your extension journey. These 10 questions will empower you to find a trusted, professional partner—helping you avoid unnecessary stress, inflated budgets, and building disasters.
Need help planning your dream extension with trusted professionals? 👉 Get in touch with Convert Extend today
