Property itself is a monopoly enforced by government, and many people don't have and can't afford it in urban areas, so it's not clear how much of an impact tha

Property itself is a monopoly enforced by government, and many people don't have and can't afford it in urban areas, so it's not clear how much of an impact that might make. Of course, if you're looking to live in a rural area you'll already find a pretty lax permitting process, but there may not be enough commercial activity around to support you. In an urban area things are more inter-dependent, and having a dense area of small homes on small lots, built however the owner feels like it and disconnected from sewage, could be a recipe for disaster. That said, allowing people to build accessory dwelling units in their yard can be a good way to slowly and evenly density an area (as opposed to plonking down a few bit apartment complexes). Many cities already do this, with some kind of expedited permit process.