There is something happening in many North American cities right now. We are starting to question the supremacy of zoning for only single-family homes.
This past summer, the state of Oregon passed policy requiring cities of 25,000 people or more to allow duplexes, triplexes, and fourplexes within their single-family home neighborhoods. Minneapolis is poised to do something similar with its Minneapolis 2040 plan (though it has been contentious). And, of course, here in Toronto we recently rolled out laneway suites all across the city. Small scale multi-family dwellings are also already permissible in some areas (though few are being built).
Some are calling this a YIMBY movement. But however you want to define it, it's an acknowledgement that, if the goal is to built
There is something happening in many North American cities right now. We are starting to question the supremacy of zoning for only single-family homes.
This past summer, the state of Oregon passed policy requiring cities of 25,000 people or more to allow duplexes, triplexes, and fourplexes within their single-family home neighborhoods. Minneapolis is poised to do something similar with its Minneapolis 2040 plan (though it has been contentious). And, of course, here in Toronto we recently rolled out laneway suites all across the city. Small scale multi-family dwellings are also already permissible in some areas (though few are being built).
Some are calling this a YIMBY movement. But however you want to define it, it's an acknowledgement that, if the goal is to built
up
instead of
out
, perhaps it's time we look at the parts of our cities with the lowest population densities. I would also add that following
, many seemed to gravitate (in the comments) toward the Parisian model -- even if it did result in over 50,000 people per square kilometer. Density, it would appear, is okay.
While positive, it remains to be seen whether these policy changes will result in a meaningful increase in housing supply. And a lot of that will come down to the details. As I have said before on the blog, the math can be challenging on these sorts of smaller projects, which is why you have smart people proposing things like an "inverse density" rule to help encourage more smaller scale development.
But as the saying goes, sometimes you need to crawl before you can walk. And, if nothing else, there's certainly symbolic value to what seems to be taking hold across North America right now.
We are in West Virginia now, where the only kind of housing that we have come across is -- not surprisingly -- low-density, detached, and single-family. Indeed, approximately 75% of the residential land across the entire US is estimated to be zoned for detached single-family homes. Using data from UrbanFootprint, the NY Times recently published a series of city maps outlining the percentage of land dedicated exclusively to this housing type.
The Seattle Times has an article up about “widespread single-family zoning” that will feel familiar to many here in Toronto who, I know, are having similar conversations about the amount of land dedicated to low-density housing.
The article, by Mike Rosenberg, estimates that 49% of all developable land in Seattle is dedicated to single-family housing; that 8% is dedicated to multi-family housing; and that another 8% is dedicated to commercial and mixed-use buildings. The rest of the land is institutional, open space, vacant, and so on.
Of all the residential lots in the city, the estimate is that 69% of them are occupied by single-family houses. This is compared to 1% in Manhattan.
up
instead of
out
, perhaps it's time we look at the parts of our cities with the lowest population densities. I would also add that following
, many seemed to gravitate (in the comments) toward the Parisian model -- even if it did result in over 50,000 people per square kilometer. Density, it would appear, is okay.
While positive, it remains to be seen whether these policy changes will result in a meaningful increase in housing supply. And a lot of that will come down to the details. As I have said before on the blog, the math can be challenging on these sorts of smaller projects, which is why you have smart people proposing things like an "inverse density" rule to help encourage more smaller scale development.
But as the saying goes, sometimes you need to crawl before you can walk. And, if nothing else, there's certainly symbolic value to what seems to be taking hold across North America right now.
We are in West Virginia now, where the only kind of housing that we have come across is -- not surprisingly -- low-density, detached, and single-family. Indeed, approximately 75% of the residential land across the entire US is estimated to be zoned for detached single-family homes. Using data from UrbanFootprint, the NY Times recently published a series of city maps outlining the percentage of land dedicated exclusively to this housing type.
The Seattle Times has an article up about “widespread single-family zoning” that will feel familiar to many here in Toronto who, I know, are having similar conversations about the amount of land dedicated to low-density housing.
The article, by Mike Rosenberg, estimates that 49% of all developable land in Seattle is dedicated to single-family housing; that 8% is dedicated to multi-family housing; and that another 8% is dedicated to commercial and mixed-use buildings. The rest of the land is institutional, open space, vacant, and so on.
Of all the residential lots in the city, the estimate is that 69% of them are occupied by single-family houses. This is compared to 1% in Manhattan.
In some cases, such as on residential corner lots in Portland, duplexes are allowed. But generally speaking, the pink corresponds to detached single-family housing. About 15% of residential land in New York City is zoned for this, compared to about 94% of the land in San Jose. Interestingly enough, none of the residential land in Manhattan is zoned to accommodate detached single-family housing.
I tried to reverse engineer the 69% based on the land use areas in the article, but the math didn’t quite add up. In any event, the argument here is, of course, that single-family homes are too expensive in Seattle and that the city needs more land available for multi-family housing.
Housing supply is no doubt important, but looking at the above chart, having a low, or lower, percentage of residential land dedicated to single-family housing doesn’t seem to necessarily guarantee affordable housing.
In some cases, such as on residential corner lots in Portland, duplexes are allowed. But generally speaking, the pink corresponds to detached single-family housing. About 15% of residential land in New York City is zoned for this, compared to about 94% of the land in San Jose. Interestingly enough, none of the residential land in Manhattan is zoned to accommodate detached single-family housing.
I tried to reverse engineer the 69% based on the land use areas in the article, but the math didn’t quite add up. In any event, the argument here is, of course, that single-family homes are too expensive in Seattle and that the city needs more land available for multi-family housing.
Housing supply is no doubt important, but looking at the above chart, having a low, or lower, percentage of residential land dedicated to single-family housing doesn’t seem to necessarily guarantee affordable housing.
