Outside, compare courses rather than colours
Look for a slate or tile sitting out of line, a ridge section that has shifted or a gutter that holds water after rain.
In the loft, look for new moisture
Fresh staining, damp insulation or wet felt after rain gives a better clue than an old dry watermark.
Photographs make slow changes easier to see
Take the same view after storms or if a crack, dip or leak appears to be changing.
Need somebody to price the repair?
Tell the roofer what you have actually seen. Let the inspection decide whether the repair is local or whether a wider section needs attention.
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