Your roof is one of the most critical parts of your home—and replacing or repairing it is rarely cheap. So when the time comes to hire a roofing contractor, choosing the wrong one can cost you significantly more in the long run.
London’s housing market is full of skilled, reputable roofers. Unfortunately, it also attracts rogue traders who offer low quotes, use inferior materials, and disappear once payment clears. The best way to protect yourself is simple: ask the right questions before anyone sets foot on your roof.
Here’s exactly what to ask—and why each question matters.
1. Are You Fully Insured?
This is non-negotiable. Any roofing contractor working on your property must carry public liability insurance and, if they employ staff, employer’s liability insurance.
Without insurance, you could be liable for injuries on your property or damage caused during the job. Always ask to see proof of insurance — a legitimate contractor will provide it without hesitation.
2. Can You Provide References or Show Previous Work?
A trustworthy roofer should be able to point you to recent projects, online reviews, or homeowners willing to vouch for their work. Look for reviews on Google, Checkatrade, or Trustpilot—and check whether the contractor responds to feedback professionally.
If they can’t name a single previous customer or direct you to any completed project, that’s a serious red flag.
3. What Materials Will You Use?
Not all roofing materials are equal. A vague answer like “we’ll sort it on the day” isn’t good enough. Ask specifically:
- What brand or grade of tiles, felt, or GRP membrane will be used?
- Are the materials appropriate for your roof type and London’s climate?
- Will they match existing materials on a repair job?
On older London properties—many of which were built in the Victorian or Edwardian era—material compatibility matters more than most homeowners realise. Using the wrong tile profile or an inferior felt system can create new problems within a few years.
4. Will You Provide a Written Quote?
Any reputable roofing contractor will give you a detailed written quote before work begins. It should clearly break down:
- Labour costs
- Material costs
- Any scaffolding or access charges
- VAT (where applicable)
- Expected timeline
Be cautious of contractors who quote verbally and “keep it flexible.” Written quotes protect both parties and prevent unexpected charges once the job is underway.
5. Is the Work Guaranteed?
Ask what guarantee covers both the workmanship and the materials. A quality roofer will typically offer:
- A workmanship guarantee of 5–10 years
- Manufacturer warranties on materials (often 10–25 years for GRP or slate)
Get the guarantee in writing. A contractor who hesitates to back their own work in writing is telling you something important.
6. Will You Handle Scaffolding and Access Safely?
Roofing work almost always requires safe access — either a scaffolding structure or a tower. Ask who is responsible for arranging and inspecting it, and whether it complies with current UK working at height regulations.
Cutting corners on access is not just illegal — it’s dangerous for workers and can cause damage to your property.
7. Are You Registered or Accredited?
While roofing isn’t a legally licensed trade in the UK, accreditation with recognised bodies adds a meaningful layer of credibility. Look for membership with:
- NFRC (National Federation of Roofing Contractors)
- TrustMark
- Checkatrade or similar vetted platforms
These organisations carry out background checks and hold contractors to professional standards.
8. Who Will Actually Be Doing the Work?
Some contractors quote the job themselves, then subcontract it to others. This isn’t always a problem — but you deserve to know. Ask:
- Will your own team carry out the work?
- If subcontractors are used, are they vetted and insured?
- Will a supervisor be on site throughout the project?
On larger jobs in areas like Barnet, Harrow, or Ealing, knowing exactly who is on your roof matters.
9. What Happens If Something Goes Wrong?
A confident, professional contractor won’t be offended by this question. Ask what their process is for:
- Addressing defects or failures after completion
- Handling unexpected structural issues uncovered during the job
- Communicating delays
How a contractor responds to this question tells you a great deal about how they operate.
10. Can I Have a Contract Before Work Starts?
A formal contract doesn’t need to be complex — but it should exist. It should confirm the scope of work, agreed price, timeline, payment terms, and guarantee details. Never pay in full upfront, and avoid cash-only contractors.
Summary: Hire with Confidence
Asking these questions before hiring a roofing contractor in London isn’t about being difficult — it’s about protecting your home and your money. A reputable contractor will welcome every single one of these questions. One who doesn’t is probably not someone you want working on your roof.
At Smart Roofing London, we’re always happy to answer your questions, provide written quotes, and walk you through exactly what’s involved before we start. We serve homeowners and landlords across North and West London — from Camden and Hampstead to Harrow, Wembley, and Finchley.
Ready to get a quote from a roofer you can trust? Contact Smart Roofing London today →
