This detached accessory dwelling unit has been featured in the City of Portland's Build it Green! and in the Self Guided Accessory Dwelling open house tours. The Earth Advantage rated home incorporates 8” deep double-stud walls, in-floor radiant heat, and a heat recovery ventilator. The primary challenges were a very tight construction budget and the pre-2016 ADU land use codes, which where far more onerous than they are today. The 799-square-foot home feels spacious despite its small size due to cathedral ceilings and an open floor plan. The site was mostly shaded from deciduous trees to the south, negating PV solar panels as an option, but we did take advantage of the leafless winter trees by placing the majority the windows on its southern walls for solar gain.