Homeowners researching sustainable remodels typically ask about water-efficient fixtures, energy-efficient appliances, recycled or reclaimed materials, and low-VOC paints and finishes. It's a smaller but genuinely growing search category, and one with comparatively little dedicated content from most local remodelers.
If sustainable materials are already part of how you work, a dedicated page or post capturing this search intent is close to free traffic - most competitors aren't targeting it directly, even when their actual work would qualify.