Do several patches prove one common source?
Not by appearance alone. Keep each position and its timing identifiable so investigation can consider connections without assuming them.
How should I organise photographs from different rooms?
Use clear room and surface descriptions with dates. Include wider views as well as details so each image stays connected to its location.
Can one room improve while another still needs attention?
Yes, describe the specific observations. Improvement at one surface should not be used to settle a different unresolved concern.
Is every possession included if I list a room?
No inclusion should be inferred. Confirm the named materials and items, with different work discussed separately.
What if another person controls one affected space?
Explain access and authorisation before booking. A room list does not supply permission to inspect or open another area.
Should I use a standard clean for the whole list?
Ordinary household cleaning has another scope. Report mould directly so appropriate inspection and suitable treatment can be discussed.