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How were you handling access, scaffolding would seem appropriate, even the most careful tradesman would want protection against breaking that glass roof light. I would insist on covering it with a sheet of ply.
If I had this kind of text from someone I would assure them you will leave it clean and tell them you are having a scaffold lift installed above the floor level and the glass will be protected with an 18mm ply sheet.
The scaffold could have feet to spread load or put some ply under it.
If you had been planning ladder access that would seem very optimistic.
I would have plenty of concerns about working in that area.
I have a window that needs work and my neighbour is not keen on me having a workperson get near his porch. Not sure what to do. Any ideas? They can't work on it without