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Signs that a roof may need full replacement include widespread missing or cracked tiles, significant sagging, repeated leak issues despite repairs, age of the roof (most pitched roofs last 30–50 years depending on materials), and visible daylight through the roof from inside. A reputable roofer will give you an honest assessment and show you evidence of their findings.

Under the Work at Height Regulations 2005, any work carried out at height must be properly risk assessed. For most pitched roof work, scaffolding or an appropriate alternative is required. A roofer who offers to carry out pitched roof work without scaffolding should be viewed with caution — it may indicate they are cutting corners on safety.

Yes — always request a written workmanship guarantee. For major roofing work, a guarantee of at least 10 years is reasonable. Check whether the guarantee is backed by the roofer personally, a manufacturer's guarantee on materials, or an insurance-backed scheme.