For insurance, compare like with like rather than just the annual premium. Clarify what sits with the individual duplex owner, what sits with the shared building and what remains your responsibility after an incident. For the detached home, ask for a quotation based on the actual property rather...
I’m not convinced duplicates are always a portal failure. Multiple adverts can reveal that the same home is being marketed in different ways. The real problem is that buyers cannot easily connect them and see which entry is current. Matching photos, map position, room count and energy label may...
Treat the portal as a discovery tool rather than a reliable live inventory. For promising homes, keep your own record of the address or approximate location, advertised area, energy label, price and contact date. That should expose duplicates even when the photos or descriptions have been...