Point access blocks, which are also known as single-stair buildings, are getting a lot more attention here in Canada. And B.C. looks like it might be one of the first provinces to relax its building code. Here's an excerpt from a recent Globe and Mail article:
Canada’s building code, which provinces have generally gone along with, has required two staircases per apartment building since 1941. But B.C.’s Ministry of Housing last week published a research report outlining the optimal conditions for single staircases.
“We are definitely moving forward with this,” said Ravi Kahlon, the Housing Minister, who hopes to introduce the legislation allowing the change in the fall.
Mr. Kahlon said that the option of “single-egress” buildings, as they’re also called, will be confined to areas where there is professional fire services (as opposed to rural-style volunteer departments) and good water supply, as is the case in Seattle. That city has allowed single-stair buildings since 1974.
Point access blocks, which are also known as single-stair buildings, are getting a lot more attention here in Canada. And B.C. looks like it might be one of the first provinces to relax its building code. Here's an excerpt from a recent Globe and Mail article:
Canada’s building code, which provinces have generally gone along with, has required two staircases per apartment building since 1941. But B.C.’s Ministry of Housing last week published a research report outlining the optimal conditions for single staircases.
“We are definitely moving forward with this,” said Ravi Kahlon, the Housing Minister, who hopes to introduce the legislation allowing the change in the fall.
Mr. Kahlon said that the option of “single-egress” buildings, as they’re also called, will be confined to areas where there is professional fire services (as opposed to rural-style volunteer departments) and good water supply, as is the case in Seattle. That city has allowed single-stair buildings since 1974.
In this case, the proposed change is expected to be limited to six storey buildings that have no more than four apartments per floor. That still feels fairly limiting, but it's at least a step in the right direction.
I have been spending some time looking at the feasibility of small six-storey apartments (here in Toronto), and I can tell you that it's not easy to make the math work. You need to optimize, everything. Minor assumption changes can really blow up the model.
I don't think that this change will magically fix that. But it's still meaningful progress. And if we keep chipping away at this housing problem, we might actually get there.
We have spoken before about buildings, such as this 6-storey one in Paris, that were allowed to be built with only a single exit stair. This is noteworthy because, here in Canada, if you were to try and build an equivalent 6-storey building on an equivalent 100 square meter site, you would be required to have two exit stairs. And that would create more non-leasable space and make it even more challenging to develop such a small building.
It is for this reason that single-stair buildings have been getting an increasing amount of attention as of late. They are seen as a way of encouraging more missing middle housing.
So where are single-stair buildings currently allowed? Below is a map from Seattle-based Larch Lab showing the maximum number of storeys for point access blocks (what they call single-stair buildings) around the world. Based on this, Canada is one of the most conservative countries on the planet when it comes to required exiting (I don't want to speak for any of the grayed-out countries). It also shows that much of the world allows 6 or more storeys.
This change has been in the works for a number of years. And it’s already allowed in most of Europe and in other places in Canada, such as British Columbia. So it’s nice to see this finally happen here in Toronto.
The reason this is a big deal, and worthy of a blog post, is that it changes the cost structure for mid-rise buildings. Simply put, wood frame buildings are cheaper to construct compared to reinforced concrete and other buildings materials.
Some people think this just means developers will make greater returns. But I don’t think that’s the case (see microeconomics). The real opportunity here is to spur mid-rise development on sites that – before this change – would have been previously un-developable. That is, you just couldn’t make the numbers work.
As much as mid-rise buildings make a lot of sense from an urban design standpoint, it’s not always easy to find good mid-rise development sites. Mid-rise buildings are generally less efficient to build compared to towers and you have a lot of fixed costs that don’t scale down just because you’re doing a smaller project.
So what this change in cost structure will, hopefully, do is allow more product to enter the market. And since many big urban centers operate with perpetual supply deficits – precisely because it’s often so hard to build – this should actually help with affordability.
In this case, the proposed change is expected to be limited to six storey buildings that have no more than four apartments per floor. That still feels fairly limiting, but it's at least a step in the right direction.
I have been spending some time looking at the feasibility of small six-storey apartments (here in Toronto), and I can tell you that it's not easy to make the math work. You need to optimize, everything. Minor assumption changes can really blow up the model.
I don't think that this change will magically fix that. But it's still meaningful progress. And if we keep chipping away at this housing problem, we might actually get there.
We have spoken before about buildings, such as this 6-storey one in Paris, that were allowed to be built with only a single exit stair. This is noteworthy because, here in Canada, if you were to try and build an equivalent 6-storey building on an equivalent 100 square meter site, you would be required to have two exit stairs. And that would create more non-leasable space and make it even more challenging to develop such a small building.
It is for this reason that single-stair buildings have been getting an increasing amount of attention as of late. They are seen as a way of encouraging more missing middle housing.
So where are single-stair buildings currently allowed? Below is a map from Seattle-based Larch Lab showing the maximum number of storeys for point access blocks (what they call single-stair buildings) around the world. Based on this, Canada is one of the most conservative countries on the planet when it comes to required exiting (I don't want to speak for any of the grayed-out countries). It also shows that much of the world allows 6 or more storeys.
This change has been in the works for a number of years. And it’s already allowed in most of Europe and in other places in Canada, such as British Columbia. So it’s nice to see this finally happen here in Toronto.
The reason this is a big deal, and worthy of a blog post, is that it changes the cost structure for mid-rise buildings. Simply put, wood frame buildings are cheaper to construct compared to reinforced concrete and other buildings materials.
Some people think this just means developers will make greater returns. But I don’t think that’s the case (see microeconomics). The real opportunity here is to spur mid-rise development on sites that – before this change – would have been previously un-developable. That is, you just couldn’t make the numbers work.
As much as mid-rise buildings make a lot of sense from an urban design standpoint, it’s not always easy to find good mid-rise development sites. Mid-rise buildings are generally less efficient to build compared to towers and you have a lot of fixed costs that don’t scale down just because you’re doing a smaller project.
So what this change in cost structure will, hopefully, do is allow more product to enter the market. And since many big urban centers operate with perpetual supply deficits – precisely because it’s often so hard to build – this should actually help with affordability.
Larch Lab is a major advocate for point access blocks and they have this policy brief outlining the problem and the opportunities. One of their most interesting statistics has to do with minimum project size inflation. As recent as 2000, only about 13% of all multifamily completions in the US had more than 50 units. Today, this number has jumped to more than 55% of all new multifamily buildings, meaning we are quickly losing our ability to build small and intimate.
Point access blocks can help with this.
Of course, the reason we have exiting requirements in our building codes is because of life safety. But there's research to suggest that this level of redundancy may not be needed in certain buildings. According to the above policy brief, the average death rate (caused by a building) in point access block countries like Switzerland, France, Italy and Germany, is significantly lower than that of the US. On top of this, almost no countries in the EU require buildings less than 28m tall to be sprinklered. The US does.
All of this said, I don't think that single-stair buildings are a silver bullet for missing middle housing. It is just one important ingredient in a complicated recipe. And as evidence of this, we can look to Seattle. The 2018 Seattle Building Code allows point access blocks up to 6 storeys, which is a rare occurrence in the US. However, the city appears to be still working on missing middle reform. Presumably other ingredients are still -- missing.
Larch Lab is a major advocate for point access blocks and they have this policy brief outlining the problem and the opportunities. One of their most interesting statistics has to do with minimum project size inflation. As recent as 2000, only about 13% of all multifamily completions in the US had more than 50 units. Today, this number has jumped to more than 55% of all new multifamily buildings, meaning we are quickly losing our ability to build small and intimate.
Point access blocks can help with this.
Of course, the reason we have exiting requirements in our building codes is because of life safety. But there's research to suggest that this level of redundancy may not be needed in certain buildings. According to the above policy brief, the average death rate (caused by a building) in point access block countries like Switzerland, France, Italy and Germany, is significantly lower than that of the US. On top of this, almost no countries in the EU require buildings less than 28m tall to be sprinklered. The US does.
All of this said, I don't think that single-stair buildings are a silver bullet for missing middle housing. It is just one important ingredient in a complicated recipe. And as evidence of this, we can look to Seattle. The 2018 Seattle Building Code allows point access blocks up to 6 storeys, which is a rare occurrence in the US. However, the city appears to be still working on missing middle reform. Presumably other ingredients are still -- missing.
