Green building has emerged over the past decade as a robust movement to create high-performance, energy-efficient structures that improve occupant comfort and well-being while minimizing environmental impacts. Supported by organizations such as the U.S. Green Building Council and its Leadership in Energy and Environmental Design (LEED) standards, both public and private entities are increasingly pursuing green buildings in the institutional, commercial, and residential sectors. While this progress is impressive, for a number of reasons it has not included significant numbers of affordable housing projects. These reasons, several of which are unique to affordable housing, include: an almost exclusive focus on "first costs," the existence of per unit cost caps, regulatory rigidity that limits green innovation, and a finance system that fails to recognize the long-term value of green investments.

The U.S. Green Building Council's new rating system for Leadership in Energy and Environmental Design in neighborhood development, known as LEED-ND, is coming under fire for not putting a greater emphasis on affordable housing.