At least in the US it hardly seems a lack of building capacity, but that the final prices are bid to levels outside for the reach of the average person by investors. I live at the edge of nowhere and in just the past half decade there where at least two fairly large developments of not too special copy paste houses stood up. They all entered the with prices on the upper end of $300K and seem to have gotten snapped up right away. Statistically I make more than the the average by a decent margin, but there’s no chance I’m paying for an almost $400K place. Even if I had the old 20% down it’d approach somewhere around $3000/month.