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.
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.
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.
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.
Roofing considerations before fitting solar panels
If a roof needs re-covering within the next 5-10 years, it's usually more cost-effective to do that before fitting solar panels rather than after, since removing and refitting panels for a later re-roof adds cost. Worth asking a roofer to assess roof condition before committing to solar installation timing.
How long does roofing work take?
A small tile repair is usually a few hours. A full re-roof on an average semi-detached house commonly takes 1-2 weeks including scaffolding, weather permitting — roofing work is one of the more weather-dependent trades, so timelines can shift.
Chimney repairs and rebuilds
A leaning or spalling (crumbling brick) chimney is a structural safety issue, not just cosmetic — some roofers handle chimney repointing and rebuilding themselves, others work alongside a bricklayer. If the chimney is still in use for a flue, check whether it needs to stay swept and functional during the work.
Flat roof vs pitched roof considerations
Flat roofs (felt, GRP fibreglass, or rubber/EPDM) typically need replacing more often than a pitched tiled roof, but repairs are usually quicker and cheaper. A flat roof extension on an older pitched-roof property is common and often uses a different material and roofer specialism than the main roof.