The short answer
Before making an offer, or immediately after an offer is accepted — early insight gives you more control and avoids late surprises.
The value of a Property Intelligence Report comes from timing: the earlier you have it, the more options you still have if it flags something serious. Get one after solicitors are instructed and a mortgage valuation is underway, and you've already lost the chance to avoid the costs a late discovery brings.
Why this matters for your purchase
This is the kind of thing a PropM8 Property Intelligence Report is built to surface early, before solicitors, surveyors or lenders are involved, while it still costs nothing to walk away.