| Home prices keep reaching new heights in some areas due to: 1) Migration. Immigration from outside the country, but also internal immigration within the country from less economically vibrant parts to more economically vibrant regions. 2) Falling interest rates keeping the monthly mortgage payment the same or lower despite higher principals 3) Expectations that the price trend for homes will continue to look like the past. This expectation can lead to people buying more housing than they would normally consume. 4) Shrinking household sizes. You have gone from an average household size of 3.33 in the 1960s to an average household size of 2.53 today. That may not seem like much but you would need ~25% more housing today to accommodate the same population. 5) Larger house sizes. From a median of about 1000 sq ft in 1950 to 2300 sq ft today. The above can combine to keep pushing up house prices in some areas (as we see in the US) even as the population growth of a country stagnates. |
Most new housing development after the war was gotten by turning farmlands and nature into single family houses. A lot of places have reached the limits of how far one can expand and run into some combination of geographical barriers, legal barriers (e.g. protected park or farmlands), or the barrier posed by time (most people have an upper limit of how long they are willing to commute.)
The next logical step in density, subdivision of existing lots and/or intensifying into homes that accommodate two, three, four families in a place where a single family house stood, is pretty much illegal on most residential parcels in the US. Pre-zoning, neighborhoods were free to densify as they desired, so even in older single family neighborhoods there are sprinklings of slightly more intense development. But in 2021 zoning reform is hotly contested because people feel like they should have control over what their neighbors do with their land, and the overall result is that there isn’t too much developable land left.