Start With Verifiable Credentials
The National Federation of Roofing Contractors (NFRC) is the UK's primary roofing trade body. NFRC membership requires contractors to meet standards for quality, insurance and workmanship, and all members are listed on the NFRC website so you can verify membership independently. It's not the only indicator of quality, but it's the easiest to check and it excludes a large proportion of unreliable operators who don't hold it.
Public liability insurance is non-negotiable. Ask for the certificate — not just confirmation that they have it — and check the cover level (minimum £2m, preferably £5m for domestic work). An uninsured contractor working on your roof means you bear the liability for any incident involving their team or any damage to neighbouring properties.
How They Quote Tells You Everything
A reliable roofer inspects from a scaffold or properly secured ladder before quoting. A quote given from the ground — or worse, from a Google Street View image — is not a reliable quote. It's a number designed to get you to commit, with scope for additions once the job starts. The excuse is usually "we won't know until we get up there" — which is precisely why a proper inspection before quoting is necessary.
The quote should be in writing and itemised. It should specify: the work to be done, the materials to be used (not just "quality tiles"), the total fixed price, what's included in that price (skip, guttering, lead), the expected duration, and the payment structure. Any contractor who gives a verbal quote and asks for cash on completion is not operating professionally.
Red Flags That Should End the Conversation
Stop the conversation immediately if any of the following appear:
- Unsolicited cold calling — particularly after a storm. Legitimate Derby roofers don't knock on doors offering to inspect roofs that look like they might have been damaged. "Storm chasers" operate this way; they identify storm-damaged streets, offer free inspections, and upsell unnecessary work.
- Large upfront payment requests — a materials deposit for a large job (30% or so) is normal. Asking for 50–80% before work starts is not.
- Pressure to decide immediately — any claim that the price is only available today, that there's another customer waiting for the slot, or that they happen to have leftover materials from the previous job.
- No written quote — if they won't put it in writing before you commit, they won't stand behind the price during the job.
- Recommending roof sealant or coating products — these products have no legitimate place in domestic roof maintenance. Any contractor recommending them is either misinformed or prioritising margin over your roof's long-term condition.
Check Local Reviews Specifically
Google reviews are the most useful source because they're location-specific and harder to fabricate at scale than Checkatrade profiles. Look for reviews that mention specific job types and specific Derby locations — a review that says "replaced the ridge tiles on our Normanton semi" tells you more than "great service would recommend". Consistent reviews over 2+ years of trading are more reliable than a recent cluster of 5-star reviews from accounts with no review history.
Ask About the Guarantee in Writing
A verbal guarantee means nothing. Ask for the guarantee terms in writing before work starts — specifically: what does it cover, how long does it last, what exclusions apply, is it transferable to new owners. A 10-year written guarantee that covers workmanship and materials defects is the industry standard for quality operators. A "12-month guarantee" on a re-roof is inadequate; most defects in a poorly executed re-roof don't manifest within 12 months.
Derby-Specific Considerations
For properties in Darley Abbey or the Friar Gate conservation area, check that the contractor has specific experience with period materials — lime mortar, reclaimed Welsh slate, Code 4/5 lead to correct specification. These are specialist skills and not every Derby roofer carries the knowledge or the materials. For 1960s–70s estate properties in Normanton, Chaddesden or Mackworth, check whether they carry the correct concrete interlocking tile profiles on their vans — a company that stocks only one profile will either use a non-matching tile or tell you there's a delay while they source it.
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No — NFRC membership is voluntary. But it provides independent verification that a contractor meets minimum standards. You can check any NFRC member's registration on the NFRC website.
For significant work — full re-roofs, large flat roof replacements — getting two or three quotes is sensible. For repair work where the scope is clear, one reliable contractor with a good reputation is often more efficient than managing multiple surveyors. The cheapest quote is rarely the right choice; focus on the specification and guarantee, not the headline price.
Work scope, materials specification, fixed price, payment schedule, expected duration, guarantee terms, and the contractor's insurance details. Any of these missing should prompt a conversation before you commit.
Check NFRC registration, ask for their public liability insurance certificate, search their company name on Companies House, and look for Google reviews with specific local references. A legitimate contractor will have no problem providing any of this.