In April of 2025, a bill was introduced in Washington, DC, called the One Front Door Amendment Act. It aims to do what many cities are now working on or considering, which is to allow single-stair/egress buildings up to six storeys. This, as most of you know, is very common throughout the world. It's a key ingredient in fine-grained infill housing, but it is generally not permissible in Canada and the US above certain build heights. In DC, I understand the current limit is 3 storeys.
The bill had its first Council reading last month and it passed unanimously (13-0). There is the small problem of there being no funding to enact the bill (it was passed "subject to appropriations'), but I call that a minor detail. The deadline for the Department of Buildings to issue new rules is July 1, 2027, which means this is how long they have to find the money and then do the technical work required to allow these new single-stair buildings. It's not done yet, but from the outside, it appears to be progressing.
Now the obvious question becomes: what the hell is taking Toronto so long? What is our deadline for implementation? As far as I know, there isn't one. (Please correct me if I'm wrong.) We now permit 6-storey apartments along all "Major Streets" in the city — from a planning perspective, at least — except the economics do not work at scale, and the requirement for two exit stairs remains one of the major obstacles. Enough with the navel-gazing. Let's get building, Toronto!
Cover photo by Andy Feliciotti on Unsplash
It's fun to examine projects that I could never underwrite or build in Toronto. Here's another one from Tokyo — a 10-storey, single-stair apartment building on a busy street, next to a metro station.
As many of you know, the Ontario Building Code requires multi-residential buildings over two storeys in height above grade to have more than one means of exiting the building. This typically means two exit stairs.
If you'd like to build something more ambitious than this, you generally have two options. One, you could design your second-floor homes to be multi-storey. I'm not a building code expert, but I've seen architects like Craig Race (and others) do this without triggering the requirement for a second exit.
Your second option is to apply for what's called an "alternative solution." This is basically a way of saying to the building department, "Hey, my design deviates from the standard prescriptive method, but it still achieves an equal or greater level of safety, performance, and functionality, so you should approve it anyway."
Last year, the City of Toronto sent a message that it was going to be more open to single-egress alternative solutions. It commissioned a report that looked at the feasibility of relaxing egress requirements for buildings up to four storeys and published a guide to help builders prepare these proposals. The goal was and is to encourage more missing middle housing.
So has it worked?
This past week, Pamela Blais shared her experiences on Twitter. She is trying to build a three-storey sixplex (Part 9 of the Ontario Building Code) with a single stair, so she submitted an ASP. It included:
Fully sprinklered building
Widened exit stair (1200mm vs. 900mm)
Expanded landings (1650mm)
Stairwell skylight for smoke exhaust
Improved fire ratings (structure, suite separation, exits, and balconies)
Balcony in every home for refuge or direct exit
And the city's response was: "Nope. This does not meet the required performance levels."
I can also share that we have had meetings with code consultants regarding the feasibility of doing a single stair in a six-storey building and the guidance we received was that there's no way an ASP would be approved. We would be wasting our time and money. All of this should make it clear that we're not there yet.
Thank you, Pamela, for sharing your experience. As one commenter on Twitter said: "A noble quest you are on."
In April of 2025, a bill was introduced in Washington, DC, called the One Front Door Amendment Act. It aims to do what many cities are now working on or considering, which is to allow single-stair/egress buildings up to six storeys. This, as most of you know, is very common throughout the world. It's a key ingredient in fine-grained infill housing, but it is generally not permissible in Canada and the US above certain build heights. In DC, I understand the current limit is 3 storeys.
The bill had its first Council reading last month and it passed unanimously (13-0). There is the small problem of there being no funding to enact the bill (it was passed "subject to appropriations'), but I call that a minor detail. The deadline for the Department of Buildings to issue new rules is July 1, 2027, which means this is how long they have to find the money and then do the technical work required to allow these new single-stair buildings. It's not done yet, but from the outside, it appears to be progressing.
Now the obvious question becomes: what the hell is taking Toronto so long? What is our deadline for implementation? As far as I know, there isn't one. (Please correct me if I'm wrong.) We now permit 6-storey apartments along all "Major Streets" in the city — from a planning perspective, at least — except the economics do not work at scale, and the requirement for two exit stairs remains one of the major obstacles. Enough with the navel-gazing. Let's get building, Toronto!
Cover photo by Andy Feliciotti on Unsplash
It's fun to examine projects that I could never underwrite or build in Toronto. Here's another one from Tokyo — a 10-storey, single-stair apartment building on a busy street, next to a metro station.
As many of you know, the Ontario Building Code requires multi-residential buildings over two storeys in height above grade to have more than one means of exiting the building. This typically means two exit stairs.
If you'd like to build something more ambitious than this, you generally have two options. One, you could design your second-floor homes to be multi-storey. I'm not a building code expert, but I've seen architects like Craig Race (and others) do this without triggering the requirement for a second exit.
Your second option is to apply for what's called an "alternative solution." This is basically a way of saying to the building department, "Hey, my design deviates from the standard prescriptive method, but it still achieves an equal or greater level of safety, performance, and functionality, so you should approve it anyway."
Last year, the City of Toronto sent a message that it was going to be more open to single-egress alternative solutions. It commissioned a report that looked at the feasibility of relaxing egress requirements for buildings up to four storeys and published a guide to help builders prepare these proposals. The goal was and is to encourage more missing middle housing.
So has it worked?
This past week, Pamela Blais shared her experiences on Twitter. She is trying to build a three-storey sixplex (Part 9 of the Ontario Building Code) with a single stair, so she submitted an ASP. It included:
Fully sprinklered building
Widened exit stair (1200mm vs. 900mm)
Expanded landings (1650mm)
Stairwell skylight for smoke exhaust
Improved fire ratings (structure, suite separation, exits, and balconies)
Balcony in every home for refuge or direct exit
And the city's response was: "Nope. This does not meet the required performance levels."
I can also share that we have had meetings with code consultants regarding the feasibility of doing a single stair in a six-storey building and the guidance we received was that there's no way an ASP would be approved. We would be wasting our time and money. All of this should make it clear that we're not there yet.
Thank you, Pamela, for sharing your experience. As one commenter on Twitter said: "A noble quest you are on."
The site itself is only 59.49 m2 (~640 ft2), and the building footprint is 47.97 m2 (~516 sf), for a total of 388.28 m2 (~4,179 ft2). There's retail on the first and second floors, one home per floor on levels 3 through 8, and then a two-storey home on levels 9 and 10. All of this is serviced by a single elevator, and a single open-air egress stair off the back.
The building itself uses a simple structural system involving 6 columns (which you can see evenly placed on the plans). According to the architect's notes, they started with a simple 4-column design, but apparently the columns were too large and compromised the suite layouts.
Tokyo is a unique city and this kind of housing wouldn't work everywhere. But there's a universal lesson here: removing barriers and allowing small infill projects is a good thing for cities. Until these projects are feasible, we won't know exactly what the market actually wants and could support.
Photos from Hiroyuki Ito Architects
The site itself is only 59.49 m2 (~640 ft2), and the building footprint is 47.97 m2 (~516 sf), for a total of 388.28 m2 (~4,179 ft2). There's retail on the first and second floors, one home per floor on levels 3 through 8, and then a two-storey home on levels 9 and 10. All of this is serviced by a single elevator, and a single open-air egress stair off the back.
The building itself uses a simple structural system involving 6 columns (which you can see evenly placed on the plans). According to the architect's notes, they started with a simple 4-column design, but apparently the columns were too large and compromised the suite layouts.
Tokyo is a unique city and this kind of housing wouldn't work everywhere. But there's a universal lesson here: removing barriers and allowing small infill projects is a good thing for cities. Until these projects are feasible, we won't know exactly what the market actually wants and could support.
Photos from Hiroyuki Ito Architects
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