Repair is the right call when the damage is localised, the rest of the roof is sound, and the repair cost stays well under 20–30% of a full replacement. Replacement becomes the smarter option once a roof is past 25–30 years old, has had three or more separate leaks in the past two years, or shows signs like daylight through the loft, a sagging roofline, or widespread tile damage.
Most new roof installations in the UK take between 2 and 5 working days for an average semi-detached or detached home. A small roof, such as a garage or extension, can be finished in a single day, while a large or structurally complex roof, particularly one using natural slate, can take up to a week or more. The exact figure depends on your roof's size, the material you choose, the weather during the build, and what's found once the old covering comes off.