Water can come from the wall above
Cracked pointing, render or a leaking sill can run behind sound bay-roof flashing.
Lead bays fail differently from felt or membrane bays
Lead can split at stressed folds. Felt and single-ply coverings are more likely to fail at seams, edges and upstands.
The ceiling stain may sit behind the front wall
Water entering at the rear upstand can travel across the bay deck before appearing inside.
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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