Passive Houses: A conversation with Kevin Meyerson

While doing research for our November 2014 Home Truths column in the Japan Times, we talked to Kevin Meyerson, who has lived in Japan for 25 years and recently sold his web design business in Tokyo and moved to Karuizawa in Nagano Prefecture, where he built a passive house. Our conversation about his new home lasted more than an hour, and, obviously, only a small part could beĀ used in the article. Here’s a bit more.

-How did you find out about passive houses?

We bought land in Karuizawa in 2010 and I was going to commute to Tokyo. I wanted to build an environmentally friendly house. My company had gotten ISO 14001 certifications several years before and I became more aware of energy efficiency and environmental issues concerning the use of energy, so I wanted to build an energy efficient house and looked at Japanese smart houses. There’s a new Japanese standard being considered for 2020 and I looked into those houses, and then I found out about LEED in the U.S., which is similar to CASBEE here in Japan, and I talked to the LEED architect for a while and found out through him about passive houses and that there was an architect who just brought the standard to Japan. She built the first one in Kamakura in 2009. There’s about ten now in Japan and a bunch more under construction. It’s going really fast, actually.

The LEED architect’s comment sort of blew me away with regard to passive houses. “I could probably build you a house that could be heated by a single candle, but why would you want to do that?” But my thinking was, if you can do that why wouldn’t you? So I contacted the architect who brought the passive house standard to Japan and she was quite busy but we were in a rush, and about nine months later her schedule became open and she decided to take on the project.

-Is LEED a company?

No, it’s a standard in the U.S. In Japan there’s a similar kind of system, though it’s not really a standard. It’s a checklist: Do you have solar panels on your house? Do you eat organic? There’s a whole bunch of stuff indirectly related to environmentally sound living. It’s been adopted by some architects who want to make environmentally friendly structures.

-Is it like LOHAS?

It’s a bit more formal than that. The passive house is a very simple standard in that it’s extremely focused on energy consumption on a per-square-meter-of-floor-space basis. If you have a square meter of floor space in your house you can only use 120 kilowatt-hours of energy per year. There are a couple of other standards besides overall energy consumption, but it’s focused on reducing the amount of energy you use per square meter while maintaining a comfortable living environment. The LEED standard, like CASBEE in Japan, is broader. It’s not just about energy consumption. It’s about a whole bunch of things. Some people think that’s a better way to do it, but if you build a house that’s LEED-certified it still can consume a lot of energy, so some people have been criticizing LEED and CASBEE as being a means of looking environmentally friendly without actually being environmentally friendly.

-When you first decided to build a passive house, did you have a model you looked at?

I looked up a bunch of stuff on the net and found that the passive house standard is quite common in Europe. And it’s becoming more common in the U.S. as well. And in all the cases the comments of people who lived in passive houses was that they never knew how comfortable a house could be, or now that they live in one they couldn’t live anywhere else. Read More

Insulate it


Recently, there was a conversation on Twitter about insulation, which outside of Hokkaido has only caught on recently in Japan. I’ve heard more than once that Japanese homes are built for summer, but older, traditional Japanese houses did a fair job of conserving heat, since most were designed with roka (hallways) around the perimeter of the house, which meant there was a space between the walls of the inner rooms and the exterior walls and windows. But since the war and even before, Japanese houses have become boxier in order to accommodate smaller parcels of land near large cities so that middle class families could afford them. Since insulation per se wasn’t an integral consideration of traditional homes, no one really thought to incorporate it in the new style. People just bought more kerosene. Read More