Interesting floor plan that shows what mitigations are possible that are not a second stair or sprinklers (neither of which are common in new apartment buildings in France). The lower floors have a short double-loaded corridor with five units of up to 4BR, which I... divisare.com/projects/548...

Updated to include changes in City of Vancouver, recent change from 16 to 20 storeys in Sweden, and permissions for existing buildings in Nova Scotia. secondegress.ca/Jurisdictions

Fascinating 2008 paper on "Redefining fire safety in Swedish high-rise buildings" speaks to risk-informed design of single exit stair high-rise buildings in Sweden, featuring the Turning Torso (54 storeys, residential/offices) and the Kista Science Tower (31 storeys, offices) wuz.se/wp-content/p...

A new bombshell modeling report by the State of Minnesota has found that small single-stair buildings with smoke-separated stairwells are likely to be SIGNIFICANTLY SAFER than typical double-loaded apartment buildings

Today, the City of Vancouver approved the code change to the Vancouver Building By-Law (VBBL) to allow Single Exterior Exit Stair (SEES?!?) for up to 6 storeys in height, as well as accommodating scissor stair layouts for 6 storeys of limited area by reducing the minimum distance between exits.

Excited to share a new video I produced with Urbanarium on their Decoding Timber Towers competition, which challenged teams to design 8–20+ storey buildings out of wood! Check it out here: www.youtube.com/watch?v=gQ42...

The Mid-rise Pattern Designs endorsed by the Government Architect of New South Wales (Australia) provides a catalogue of small lot and corner lot apartment building designs of 4 to 7 storeys in height. Take a look at the floor plans and renderings. www.planning.nsw.gov.au/government-a...

Somebody in the audience pointed out something that I didn’t know, which is that Queensbridge Houses, the largest NYCHA project in the city (and thereby largest public housing complex in North America), is single-stair. platform-affordable-dwelling.bk.tudelft.nl/database/201...

"Although corner stores may seem a trivial issue, allowing them near where people live can make a neighbourhood more pleasant and, well, convenient. But antiquated zoning laws make them illegal in most neighbourhoods of Canada..." www.theglobeandmail.com/opinion/edit...

“The era of shoebox condos is over” in the Globe and Mail today - a feature on single stair: ”Yet with features such as sprinklers, smoke-sealed doors and more reliable fire alarm systems, mid-size apartment buildings can be just as safe...” www.theglobeandmail.com/investing/pe...

Fascinating article. This really stood out to me: smaller cars are more popular in Canada than in the U.S., but due to Transport Canada tying its safety standards to the U.S., Canada gets stuck with our huge cars instead of smaller European models. I wonder if the same is true of U.S. cities 🤔

I’m at the launch of Oregon’s design competition for sunlight suite buildings - neighborhood-scale mulifamily buildings designed around one central staircase. “This is one of those innovations whose time has come,” says Gil Kelley of @1000oregon.bsky.social.

Single-stair buildings up to 6 stories are legal in Baltimore City! Headed to Mayor Scott's desk for signature.

This pilot project for SES building design is also featured here. Others of similar configuration have been accepted in Vancouver, Edmonton and Hamilton. singlestair.ca/Office-Ou

Winner of Billings Architectural Association's 2025 Single-Stair Housing Competition by Trae Schwenneker. The competition focused on urban infill in Downtown Billings, MT. The winning project honors the historic brick architect of Montana Avenue w/ ground-floor retail & four upper levels of condos.

Our team placed 2nd in the Urbanarium "Decoding Timber Towers" architectural ideas competition (1st place to @moriyamateshima.bsky.social) with our 20-storey mass timber tower featuring a compact elevator and exit stair core, exposed ceilings, prefab balconies and a balanced mix of 1 to 4 bed homes!

Pew finds something that everybody in codes and standards knows but few will say out loud: we apply far stricter fire safety standards to apartments than to houses. www.pew.org/en/research-...

“Modern apartments have a fire death rate … six times lower than older apartments… (or) single-family homes…” Aka why new single stair flats would be among the safest buildings in your city. www.linkedin.com/pulse/why-bu...

Modular, mass timber, and single-stair This workforce housing project in Montana maxes out the current IBC code limitations on single housing with a 10,000 sf floor plate and 8-bed units that each feature shared living, kitchen, and laundry. www.idcubedmodular.com/blank

This comparison shows the price of putting an internal garage on a rowhouse Both of these rowhomes are ~16' wide Left: 2BR+Den/3BA Right: 4BR/3.5BA So the cost is losing TWO bedroom.

Visited two of my favourite Point Access Blocks (single stair apartment buildings) in Berlin… E3 on Esmarchstrasse in Prenzlauerberg (encapsulated mass timber, noncombustible exterior stair) and Walden 48 co-op housing project nearby in exposed mass timber and treated wood cladding.

Why are single-stair buildings actually SAFER than two stair buildings in some circumstances? It seems counter intuitive… obviously, more redundancy is better, right?

Important TOMORROW: The LA City Council is going to vote on whether to legalize single stair buildings. Opponents have launched a disinformation campaign, and we need people to give public comment in support. Will you be joining me tomorrow at 10am in City Hall?

Design study comparing single-stair vs multiple stair egress on a small 5,500 SF lot in Denver: (L) double-loaded corridor •71% efficiency •(4) units (R) single-stair •87% efficiency •(4) dual-aspect units

Week 2 On a tiny corner lot in Boston, Condor Street Housing shows how much a single stair can do. A small elevator makes every unit barrier-free, linked by a short corridor to meet code. Even on one of the tightest sites, the plan delivers safe and accessible homes.

Behold the power of single stair

My first Starter Pack! The Canadian urbanism and planning community on here is growing. Give these folks a follow. Some well known faces … and some you should get to know! (please re-post!) go.bsky.app/AEYL7FZ

I had a good conversation with Joe Kelly on his Mass Construction Show podcast about single-stair. It’s for construction/code/fire folks, so it was more technical than most.

A new state has joined the single-stair club: New Hampshire now allows four stories of multifamily, four units per floor, with a single stair. And it’s the cleanest code section there is – same conditions as for three stories. www.centerforbuilding.org/trackers?tra...

LA's City Planning department thinks single stairs would be great for Los Angeles:

Greater Toronto got its Greenbelt in 2005. It took 20 years for the City of Toronto to partially legalize sixplexes. I think, if you want a greenbelt, you need to legalize substantial density *first*. Not just sixplexes. Single-stair mid-rises everywhere (high-rises around all subway stations).

Yesterday, Laurence Holland and Kevin Bridgman of KPMB Architects wrote an article on the principles of the Downsview Urban Design Guidelines... They note: "If Canadian building codes are reformed to permit single-stair egress up to six floors,..." (see thread) www.kpmb.com/insight/the-...

"Canada must remove barriers with the European Union to more deeply integrate Canada's economy with the EU in order to reduce our dependence on the US" 🟢 Agree: 85% 🔴 Disagree: 12% open.substack.com/pub/canadian...

Would someone like to guess what all these Spanish apartment buildings have in common that makes them illegal to build in most of North America?

Single stair Swiss high rise. 23 floors of apartments. 1, 2, 3, 4, and 5 (!!!) bedroom homes. Large, functional balconies. Solar protection. This proposal didn't even win the competition. I don't love all of the concrete, but imagine this building made of timber. afasiaarchzine.com/2025/07/rank...

Many North American cities spend more on transit expansion than cities in Europe and Asia, but get very little transit built because they are not efficient at building transit. Toronto, LA, Seattle, NY are probably the worst offenders.

Intergovernmental Panel on Climate Change scientists urge support of Berkeley’s middle housing ordinance.

Me when my local chicago housing nerd running for senate starts talking about single stair reform: 🎶 “Show that wonky metric, white boy”

Die Konsequenz der Pflicht zu zwei Treppenhäusern ist natųrlich, dass alle Mehrfamilienhäuser sehr sehr groß sind, damit sich das auch lohnt.

This month's AN Focus features Milan's 8-story, 16-unit Vanvitelli apartments by ebpc with great "cross-ventilating units" but... fails to mention the highlighted project is illegal to build anywhere in the U.S. because it exceeds single-stair stair height provisions.

Today, along with other housing advocates, I joined Colorado's @govofco.bsky.social as he signed his Smart Stair legislation legalizing 5-story single stair housing in the state. Let's goooo

Switzerland, once again allowing single stair (per species) taller than everyone else

Some might find it hard to get excited about an "Embodied Greenhouse Gas Symposium," but I certainly did; it pushed all of my buttons, from upfront carbon to sufficiency to simplicity to single-stair designs (with @holz-bau.bsky.social Mike Eliason as keynote speaker.)

The two single-stair stars, @conradspeckert.bsky.social and @holz-bau.bsky.social together at last and appropriately dressed.

Behold.

The top of @conradspeckert.bsky.social’s single-stair height limit chart get a lot of attention – Switzerland’s unlimited! – but the bottom is interesting too. Who’s down there with Canada, Chicago, and the U.S. model code? Uganda, Pakistan, Rwanda, and South Africa secondegress.ca/Jurisdictions

UPDATE: Montana's single-stair bill has passed both chambers and is moving to Governor Gianforte's desk. The bill could serve as a model for future states seeking outright adoption six story single-stair building code amendments. legiscan.com/MT/bill/SB21... bsky.app/profile/sean...