For an older building, I’d keep the contingency nearer 20% until there has been some intrusive investigation, then reduce it only when the unknowns are priced. Ask each contractor to list exclusions explicitly: rewiring versus testing, plumbing routes and access, moisture repairs, making good...
Don’t ignore withdrawn stock. An overpriced villa can disappear without a recorded sale, making the remaining listings look more liquid than the full market. The 86-day figure is hard to interpret unless withdrawn and relisted homes are tracked separately.
A practical test would be to choose five listings that survive your initial filters and record the advertised area, location, price and posting status. Contact each advertiser with the same short set of questions, then note which details change. On mobile, also check whether applying filters...
I’d avoid asking for both the full 8% reduction and unspecified repair credits at the outset. That can look like the opening discount is only the first of several reductions. Inspect first, then seek a credit for documented defects rather than general updating.
Before submitting, have the agent...