Modular prefab construction offers great advantages in quality control and speed of delivery. Our challenge was to get the most done in the factory while providing an airtight, thermal-bridge-free enclosure and owner-approved finishes. By working with a custom prefabricator, we were able to collaboratively arrive at solutions for air sealing, insulation, structure, and site-finishing. The local GC poured the foundation, applied exterior insulation, and installed fixtures, finishes, decks, and cabinetry.