One of the most important considerations for livability in a multi-family building is the elevators. And as someone who has lived in a condominium building for the last 10 years, I know firsthand that it can be frustrating when they aren't working properly. So this is obviously something that we pay a lot of attention to in our own projects.
Lately I’ve been thinking that I don’t talk enough about architecture and about buildings on Architect This City. So today I’m going to step away from transit, driverless cars, and the other topics I’ve been discussing lately, and instead talk about something a bit more technical: mechanical systems and Energy Recovery Ventilation (ERV) units. If you’re thinking about buying or investing in a condo, I think you’ll find it useful.
Buildings work in many ways just like people do. They breathe in fresh air and they exhale out stale air. And just like you and I, once air has been exhausted out, it needs to be replaced, or made up, with more fresh air. In the world of buildings, this replacement air is called “makeup air.”
It’s for this reason that you’ll often see no smoking signs directly outside of buildings. It’s because if you happen to be smoking next to a fresh air intake, you’d actually be distributing cigarette smoke throughout the entire building. The same goes for idling trucks and other pollutants.
The amount of fresh air that needs to be pumped into a building will vary. For some uses – like hospitals and laboratories – the requirement for fresh air can be significantly higher. Sometimes as high as 100%. And that’s because you don’t want a building with toxic smells or lots of sick people to be relying on too much recirculating air.
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The very general and crude rule of thumb is that you want at least 1 elevator for every 100 homes. For example, at Junction House, we have 151 suites and 2 elevators. So that means we have 1 elevator for every ~76 homes. At One Delisle, we have 371 suites and 4 elevators. So 1 for every ~93 homes. At the same time, I live in a building with 357 suites and 3 elevators (1 for every 119), and it works just fine.
But again, this is a very general rule of thumb. There are many other factors that can influence performance such as the number of levels in the building, the number of suites per floor, the number of below-grade parking levels, and so on. In my building, we have all above-grade parking, so I'm sure that impacts things.
If you have a building with a lot of below-grade parking, that will generally decrease performance all else being equal (i.e. increase weight times). Because now you have that many more stops, even if the number of homes remains constant above.
One common way to mitigate these impacts is to add a parking shuttle elevator. This is a dedicated elevator for just the parking levels, and it's something that you'll often see in office buildings. This helps service levels. It can also help the overall building efficiency (saleable area/gross construction area) by potentially eliminating the need for another elevator shaft in the above-grade levels.
But the trade-off is that you now need to transfer elevators, usually at the ground floor. Some people don't mind this and think it helps with building security. If someone sneaks into the garage, there's another obstacle to getting up into the residential floors. But it does mean that if you're coming home with groceries in your hands, you need to take 2 elevators.
I'd be curious to hear from all of you what you think about parking shuttle elevators in residential buildings. Because I suspect that as building heights increase and as parking ratios continue to decline, parking shuttle elevators will likely become more common in cities like Toronto. Let me know in the comments below.
Disclaimer: I am not an elevator consultant! I am telling you just what I have learned over the years from speaking with actual professionals. So I recommend you speak with one before making any important elevator decisions on your own projects.
I am very interested in the social side of buildings. What I mean by that is that we usually focus on the quantitative side. We look at sale prices. We look at average prices per square foot. We look at reserve fund balances. And as I recently argued, this is all very important stuff. I think we should do much more to make this data publicly available.
But there’s also a side to buildings that’s harder to measure: the human side. Sale prices and staged MLS listings don’t tell you what the people who live in the building are like. What the vibe will be like at the pool during the summer. If you can expect to find dog poo in your elevators. But when you live in a multi-family building, I think most people will tell you that the qualitative side also matters.
So this morning, I thought I would run a little experiment and pull the top Instagram photos for a random sampling of relatively new condo buildings in Toronto. These are public photos that have been uploaded and tagged with that building’s location ID.
Obviously there’s an inherent bias since I figure Instagram users probably lean towards Millennials. Also, the top posts could be easily skewed by a small number of heavy influencers. But I still thought it would be interesting to see if any particular identities started to emerge. And I do see some differences that reflect what I would have expected. I wonder how these might relate to the original marketing for the buildings.
What do you think of the photos below?
Feel free to do the same for your building and post the photo in the comments below. That could make for a really interesting discussion. My building is the first photo.
You might then be wondering why we don’t rely on 100% fresh air in all buildings. And the reason is that it is incredibly expensive to do so. When you take in fresh air from outside, it needs to be conditioned before it can be distributed. And that takes energy. In the winter when it’s -10 degrees outside (hello Toronto), you need to heat up that air. Whereas recirculating air is already conditioned. So you just, well, recirculate it.
In most condo buildings, makeup air is supplied by dumping air into the corridors. To check if your condo functions like this, just look for a big vent outside in your hallway. This air then gets sucked into the individual suites by way of slits or openings around your front door.
So another way to check if your building operates this way is to see if your front door is letting in air from the hallway (or if it’s sealed). There’s nothing necessarily wrong with this approach, but sometimes you might end up pulling in smells from outside of your suite.
The way an ERV works is very simple. Let’s use our winter example, where it’s -10 outside (and you’re questioning why you live in a place that’s so cold). In this scenario, you’d be pulling in freezing air and exhausting out warm air from your apartment.
What the ERV does is transfer some of the warmth from the warm exhaust air to the cold intake air. This means the fresh air ends up coming inside your place at a warmer temperature and doesn’t need to be heated up as much. It’s “preconditioned.”
This saves energy. And it saves in utility costs.
But the other benefit of these ERV units is that, instead of pulling fresh air (or makeup air) from the corridor, it pulls it directly from outside of your condo suite. In other words, your front door is sealed and each suite is responsible for its own fresh air demands. The overall result is typically better indoor air quality, better energy efficiency, and lower utility costs.
At both DUKE and Kingston&Co, which are two condo projects that I’m currently working on a TAS, we’re putting an ERV unit into every suite. We think it make sense. But there are always questions around how much purchasers actually care about measures like this. Things like fancy countertops and appliances are usually what sells. Not some hidden mechanical unit that you’ll never see or even know exists.
But I think details like this matter. What about you?
