What a roof survey actually checks
A proper roof survey looks beyond the visible tiles — timber condition in the loft, flashing around chimneys and valleys, ventilation, and signs of past repairs. Worth requesting one before buying a property with an older roof, since problems aren't always visible from ground level or even from inside the loft.
Roof insulation, where it goes
Loft insulation (laid flat, cheap, effective) is different from insulating the roof slope itself (needed if the loft is being converted into living space). A re-roof is often the most cost-effective time to upgrade roof-level insulation, since the covering is already off.
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.
Roof ventilation, why it matters
Poor roof ventilation can lead to condensation build-up in the loft space, which over time causes timber rot — a factor a roofer will often check during a re-roof, since it's a much cheaper fix to address at that point than as a standalone later repair.
Seasonal roof checks worth doing
Before winter: check for loose tiles and clear gutters, since blocked gutters and ice are a common combination for damage. After a storm: a visual check from the ground for obvious damage, before assuming everything's fine just because there's no visible leak yet.
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.
Pest and vermin entry points in roofs
Gaps around fascias, damaged soffit vents, or missing tiles are common entry points for birds, squirrels and other vermin into a loft space — a roofer doing repair work will often flag these even if they weren't the original reason for the call-out.
Three steps to hiring the right roofer
First, check NFRC membership or equivalent trade body registration. Second, ask for photos of similar completed jobs, ideally local ones. Third, clarify what happens if underlying roof timbers turn out to need work once the old covering is removed — a very common mid-job discovery.