Is it structurally sound? There can be many more costly faults than the structure to be concerned about. Is there anything that would stop me from buying? Only you can make this decision after having read the report. How much to have replaced? Quotes from tradespeople would be required, not guesstimates.
Do a search on the problem. If possible, obtain at least 3 quotes. Request their guarantee period and limitations, also read the fine print. If obtaining guesstimates only, always ask for worst-case scenario costing then you are less likely to be out of pocket.