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Development of zero-energy residential units in the United States and Canada is continuing to grow, according to a recent study.

At the end of 2018 there were 22,146 zero-energy units (either single-family or multifamily) in design, under construction or completed in the two countries, Team Zero (formerly the Net Zero Energy Coalition) reported. That is a 59 percent increase from the end of 2017 (13,906 units).

A zero-energy building produces at least as much energy as it consumes over a year.

Recently, San Francisco-based consulting firm Grand View Research Inc. forecast approximately $78.8 billion of investment in the global zero-energy building market by 2025. More interest in such construction is expected in this sector, Geoff Ferrell, chief technology officer of Arizona-based Mandalay Homes, stated in a press release.

鈥淎 lot of it is driven by codes and a lot of it (is) being driven, thankfully, by builders and developers that want to get out in front of things,鈥� stated Ferrell, whose firm claims to have built more than 1,100 zero-energy units. 鈥淭hey see zero energy as a proposition that differentiates them in the marketplace, and that is one of our drivers.鈥�

Other findings of the study included:

• Multifamily buildings represented 71 percent of the total zero-energy housing stock.
• California (6,828) led all states and provinces in number of units (6,828), and New York (3,022) was second. Oregon (535) ranked ninth.
• Canada’s number of units (3,404) represented a 240 percent increase from the end of 2017.