Scan the roof plane
Dips, many replacement slates, old valley patches and uneven tile courses are worth asking about.
Use the loft during a proper survey
Fresh damp and altered rafters matter more than harmless old staining.
Think about access
A small defect beside a high chimney may be more expensive to deal with than a larger one near the eaves.
Need quotes for the repair?
Include previous work in the same area and any access issues such as a conservatory or narrow side passage.
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