Find the actual boundary
A continuous roof slope can make the party line hard to judge from below.
Drainage can cross frontages
A blockage may affect water flow along more than one property.
Local materials matter
Preston City Council describes Avenham terraces as using brick and slate, while Historic England records early nineteenth-century Spring Bank houses with slate roofs.
Ready to get the fault checked?
Explain what has happened rather than telling the roofer which part you think needs replacing.
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