A full roof replacement means stripping the existing covering back to the timber structure, checking the battens and felt (or breathable membrane) underneath, and fitting new tiles, slates, or a flat roof system from scratch. It's a bigger job than a repair: expect scaffolding, skips, a working timeframe of several days to a couple of weeks depending on the property, and disruption to your garden and driveway while materials are delivered. Installation covers the same ground for extensions, new-builds, or garages that need a roof fitted for the first time.
We've listed 5 roofing contractors in Derby who take on this kind of work. Before booking anyone, ask what warranty covers the new roof (materials and workmanship are often separate), whether they're removing and disposing of old materials as part of the price, and how they handle unexpected timber rot found once the old covering comes off. A written quote should break down materials, labour, scaffolding, and waste removal separately, not just give one lump figure.
Our scoring weighs up how these firms are reviewed for turning up on time, finishing to schedule, and standing behind their work afterward, alongside how clearly they communicate pricing and timescales. For the full breakdown and a side-by-side comparison of all five, see our ranked guide to Derby roofing contractors. If you want to understand how we arrive at those rankings, our methodology page explains the criteria and weighting in full.