The document outlines One Planet Renovations' approach to sustainable building and retrofitting through their BuildGreen Solutions consulting services. It discusses their focus on zero carbon, zero waste, and local sustainable materials principles. Sample projects are highlighted that achieved net zero energy and waste goals through super insulation, solar thermal, photovoltaics, and on-site wastewater treatment. Lessons learned emphasize assembling an experienced team committed to ambitious sustainability targets, allowing extra time for design and procurement, and clearly defining contractual responsibilities.