This document is about the densification of low-income housing. The paper analyses both spatial and non-spatial problems associated with the government’s housing subsidy program. It then explores how housing beneficiaries have creatively addressed some of these issues by transforming their subsidized houses, primarily through the addition of backyard rooms. The paper then describes a new housing typology that uses backyard rooms as a valuable precedent. The illustrated paper examines design issues that arise when designing at an optimal 100 units.