What affects the cost
Cost depends on roof size and pitch (steeper roofs need more scaffolding and take longer), the material (slate costs more than concrete tile), access, and whether the existing roof structure (timbers, felt) needs work too, not just the visible covering. A straightforward repair is quick; a full re-roof including scaffolding commonly takes 1-3 weeks.
Roof orientation and solar suitability
A south-facing roof slope generally gets the most useful sun for solar panels, though east/west-facing roofs can still work reasonably well. A roofer or solar installer assessing suitability will look at pitch, orientation, shading from nearby trees or buildings, and roof structural capacity together.
Scaffolding — why it's often a separate cost
Scaffolding is frequently quoted separately from the roofing work itself, priced by roof height, access and how long it's needed. For a small repair some roofers use a tower or ladder instead, but anything involving a full re-roof or significant chimney work usually needs full scaffolding for safety and building regulations reasons.
Signs your roof needs attention
Slipped, cracked or missing tiles, sagging in the roofline, daylight visible through the roof from the loft, and damp patches on ceilings are all signs worth having checked. A few slipped tiles is usually a repair; sagging or widespread wear across the whole roof usually points toward a full re-roof being better value than repeated repairs.
What NFRC membership means
The National Federation of Roofing Contractors is the largest UK roofing trade body, representing over 60% of the industry. NFRC members are vetted on technical competence and financial standing, and some offer an insurance-backed guarantee on top of their own workmanship guarantee — worth asking whether this applies to your quote.
Roofing felt vs breathable membrane
Older roofs often used bituminous felt underneath the tiles, which can perish and needs replacing during a re-roof; modern breathable membrane lasts longer and manages moisture better. If you're having a full re-roof, this underlay is worth confirming as part of the spec, not just the visible tiles.
Background checks and identity verification
Roofing has a higher-than-average rate of doorstep cold-calling scams (particularly after storms), so checking a roofer's trading history, a verifiable business address, and reviews referencing specific local jobs matters more here than for some other trades.
Why roofing work is weather-dependent
Roofers generally can't safely work in high winds, heavy rain, or icy conditions, so scheduled roofing jobs sometimes shift by a few days around bad weather — factor this into timing if you need work finished by a specific date, particularly in autumn/winter.