Client Alert: Thailand Removes Statutory Requirements for Rooftop Solar Panel Installations (Thailand)

Due to the intention to promote the use of solar energy both in residential and commercial establishments, Thailand is actively encouraging the adoption of solar energy by easing the requirements for solar energy generators in securing the necessary licenses and requirements from regulatory bodies including construction permit and relevant requirements.

Previously, the Ministerial Regulation No. 11 (B.E. 2528) issued in accordance with the Building Control Act, B.E. 2522 (as amended) provided that for residential buildings, rooftop solar panels installations possessing an installed area not exceeding 160 square meters and a total weight of no more than 20 kilograms per square meter were exempt from being classified as building modifications for which a construction permit would be mandated. However, before proceeding with the installation, a structural integrity assessment conducted and certified by a licensed civil engineer was required to confirm that the installation could be safely executed. Additionally, notification to the local authority was also required prior to commencing the installation.

To streamline the process and promote the use of solar energy, Ministerial Regulation No. 72 (B.E. 2568), issued pursuant to the Building Control Act, B.E. 2522 (as amended), was published in the Royal Gazette on November 19, 2025. This regulation eliminates the previous limitations on the residential buildings, the maximum area, the requirement for a structural integrity assessment conducted and certified by a licensed civil engineer, and the need to notify local authorities prior to the installation of solar rooftop panels. Consequently, rooftop solar panel installations for all types of buildings with a total weight of no more than 20 kilograms per square meter are now exempt from being classified as building modifications, and no structural integrity assessment or notification to local authorities is required.

Importantly, this regulation not only applies to residential buildings but also commercial buildings and factories. Therefore, companies are encouraged to consider adopting solar rooftop installations in their establishments and factories, particularly those that consume high volumes of energy, to reduce costs. The simplified and less burdensome process makes it easier for businesses to integrate solar energy solutions, contributing to both cost savings and environmental sustainability.

For more details about this Regulation, or on any aspect relating to renewable energy in Thailand, please contact Charuwan Charoonchitsathian at: charuwan.c@nagashima.com, or Thananya Pholchaniko at: thananya.p@nagashima.com