While interaction and product design are using data-driven methods on a daily basis, not only similar data but also methods for making use of such data for designing architectural space is missing. The spatial design feedback loop is broken, as we lack quantitative assessment systems that reveal experience and interaction from the user’s perspective. This paper describes the first of its kind development of a spatial assessment and design methodology utilizing Augmented Reality headsets, aiming to fill the gaps in the spatial design iteration loop.