零住房仍是一个非常小的球员啊verall construction starts, but the numbers are rising steadily, according to an annual survey now in its fourth year.

去年，美国和加拿大的住房总数增长了59％，从2017年不到14,000到去年总计22,146。年度会计由零团队（以前是零净能源联盟）进行，该联盟于2015年开始收集有关净零建筑物的数据。

The totals represent the numbers of units that are in design, in construction, or have been completed. When the number of housing units still in the planning stage are added, the total goes up by another 31,000.

One of the key findings is that most of the growth continues to be in projects of two or more housing units—not custom houses. In all, these projects made up more than 96% of all zero-energy housing units in 2018, about what it has been since the inventories were started.

“The unwavering prevalence of commercial [zero-energy] residential development is a clear signal that ZE is not a tiny niche for bespoke homes,” the report says. Multifamily projects now represent 71% of the total zero-energy housing stock.

从能源效率的角度来看，这些数字令人鼓舞，因为它们暗示开发商之间的持续兴趣以及对购房者和租房者的零能量选择。但是零团队对其年度报告的局限性进行了预期。在今年调查的介绍性笔记中，作者承认，它使用了零零的“广泛”定义，并依靠个人的未经验证报告来获得其统计。

一位解释性注释说：“零团队并不代表本文所包含的任何信息是高度精确或确定的。”“相反，这表明了美国和加拿大的[零能量]活动。”

That said, the authors believe the total zero-energy housing stock is much larger than the inventory reports, in part because not everyone engaged in zero-energy construction knows about the survey or Team Zero. “All of this is good,” the report adds. “It suggests strongly that ZE is catching on even faster than we know.”

Here are some of the other findings:

• 加利福尼亚州继续担任6,828个单位的净净领导者。下一个纽约，安大略省和亚利桑那州。前五名城市是伦敦，安大略省（2001年）；纽约市（1811年）；不列颠哥伦比亚省温哥华（749）；加利福尼亚州戴维斯（670）；夏威夷檀香山（389）。
• The top three builders and/or developers, by number of units, were Sifton Properties (2001), Mandalay Homes Inc. (1192), and Thrive Home Builders (579).
• 越来越多的住房单元从“零能量准备”类别转变为“零能源”。2018年，零能量现成的住房约占总数的三分之二；29％被计为零能量。净阳性房屋（产生的能量比使用更多的能量）约占总数的4.5％。

-Scott Gibson is a contributing writer at Green Building Advisor andFine Homebuilding杂志。