The short answer
Age shows at the details, not the field of the roof. Ridge beds crumble, flashings round chimneys lift, verge mortar loosens and the battens and underlay beneath start to tire. Because estate houses repeat, one survey often shows a pattern that explains a whole street.
When the same builder put up the same house along a whole street, the same weaknesses arrive at roughly the same time. That is helpful, because a fault found on one roof gives us a map of what to check on the next.
Q1.1Which details wear out first?
Along the crest runs the ridge, and the bedding beneath its tiles dries, cracks and lets go. The verge is where the covering meets a gable wall, and mortar there takes a beating from weather. Flashings, the strips of lead or metal that seal a chimney or wall junction, lift and split. None of this means the whole covering has failed. A good survey separates the repairable from the replaceable, and it explains which fault is causing which stain indoors, so the money goes on the real problem.
Q1.2Can estate roofs be repaired to match?
Usually yes, though matching a weathered tile exactly is difficult. We aim for a close visual match, and place any replacement tiles where they will be least obvious, normally on the rear slope. Where a house is part of a regular run, a visible patch can spoil the look of the terrace, so we say if a section re-cover looks better than scattered repairs. Our roof repairs page explains how we decide.
Q1.3Should the loft be checked at the same time?
Yes. A roof built in the 1950s may have an old felt underlay, or none at all, and the timbers can show where water has been entering for years. Dark tide marks on rafters, dry rot smell and sagging insulation all tell their own story, and you can only find them from inside. We photograph what we see so the report ties each fault to the exterior defect that caused it.
Gutters on these houses are worth a glance too, since cast or early plastic types can sag or split, and a blocked gutter sends water straight down the wall.