A while back I almost bought a house I was in love with. The listing was gorgeous. What it didn't tell me: the "updated" roof was at end-of-life, the comps it was priced against weren't really comps, and the repair list I eventually got was going to eat my entire reno budget. I found all of that out the slow, expensive way — one surprise at a time. So I built Dwell — basically the tool I wish I'd had standing in that driveway. You paste in an address and it gives you a free read o...