If the proposal is limited to new construction, with modern fire safety systems like sprinklers, then I think the fire safety folks have a lot less ground to stand on - a lot of the cases that IAFF likes to reach for as examples lack sprinklers or modern fire resistant construction. (Not withstanding the fact that "lightweight" modern construction methods and materials can be much more vulnerable)
That said... an average elevator shaft is what, 8x10? If its only serving a small number of units downsizing somewhat closer to ADA minimiums is eminently plausible, so a single, smaller elevator shaft co-located with the single stair is hardly outside of the realm of possibility. The issue then is whether more elevators is cheaper than the floor space for a double loaded corridor, which is much more nuanced.
I generally agree, except for the elevator item - elevators are basically modular as it is already, and given generalized federal elevator regulations... I would be surprised if elevators being installed in the US are anything but practically off the shelf. The single person sized elevators found in some older European buildings just will never be legal here... so not worth bothering with? Unlike Europe, our elevators basically are built to satsify ADA requirements that they don't have - minimium dimensions are intended to allow a wheelchair to turn around, but bigger can be preferred by developers - and notably... nothing requires redundant elevators in residential structures? (Which is probably best practice for disability access.)The building design element is really more important than the cost or square footage element to an extent that I don't think the casual observer of this proposed change really understands. The "family-sized apartments" that so many clamor for does not fit well at all in the confines of double-loaded corridor design, which is a product of multiple-staircase requirements. If you allow a cluster of a few apartments to be built around a central staircase -- as is common in cities all over the world -- it unlocks a building type that has been regulated out of existence in the US, and that building type can fit in lots that today would not work for typical five-over-one. It also allows smaller apartment buildings (but not smaller apartments) that can be taken on by smaller developers with less capital and resources, leveling the playing field on the supply side.
The goal of the regulatory change is not to "build the same five-over-ones but save money on fewer staircases," it is to "allow new building forms that don't work with multiple staircases."
Up next on the docket should be elevator reform, as North America has also regulated the smaller-and-more-standardized elevators used in the rest of the world out of existence. Do both of these and you'll be able to fit, for example, a seven-story building with twenty-six three-bedroom corner apartments plus ground-floor retail on a lot of 10k - 15k sf.
Your archetypal urbanist's dream apartment buildings in Barcelona or Paris -- or even New York -- simply don't work if every building is required to have two internal staircases separated by corridors between units.
That said... an average elevator shaft is what, 8x10? If its only serving a small number of units downsizing somewhat closer to ADA minimiums is eminently plausible, so a single, smaller elevator shaft co-located with the single stair is hardly outside of the realm of possibility. The issue then is whether more elevators is cheaper than the floor space for a double loaded corridor, which is much more nuanced.
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