Solar panels on the roofs of homes in Hachioji, western Tokyo (Asahi Shimbun file photo) Japan’s first local regulation requiring solar panel installations on new single-family homes took effect on April 1 in Tokyo and Kawasaki in Kanagawa Prefecture.
Starting April 2025, Tokyo will implement a new regulation requiring solar panels on newly constructed homes. What Is the Mandatory Solar Panel Installation? Starting in April 2025, Tokyo will require installing solar panels on all new residential buildings.
Smaller housing manufacturers are also exempt from the new rules due to the substantial paperwork and other challenges involved. As a result, only half of the 49,000 residential homes built annually in Tokyo are expected to be required to install solar panels. Nationwide, Kyoto and Gunma prefectures have already implemented similar regulations.
“Tokyo’s mandatory solar panel installation for new buildings is a step in the right direction for promoting green energy,” said Masayuki Mae, an associate professor at the University of Tokyo, who specializes in energy-efficient housing.
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