In the US even zoning to allow 5 story, 25 foot wide row homes to be built everywhere residential housing is allowed would make it easier to develop a lot of housing quickly and cheaply. It’s cheaper to build 1,000 units all at once than 2 units at a time, and if you can fit 500+ units on 500 feet of street frontage, you don’t need to buy a square mile of land in order to build a profitable development.