As of January 1, 2022, Brunswick requires compliance with the 2015 International Energy Conservation Code (IECC) for all new homes, renovations, and additions. The Department of Energy has determined that this code is 20%-25% more efficient than the previous code, the 2009 IECC. Builders and developers are encouraged to use the State's stretch code, the 2021 IECC. The stretch code is more efficient than the 2015 IECC, following this code can help lower future energy bills and reduce emissions.
The Town of Brunswick currently has full LED lighting in the Public Works facility and in the Curtis Memorial Library, and most streetlights were converted to LED fixtures in 2022. The town is currently working towards introducing more LED lighting in all traffic lights and all town-owned buildings and facilities.