The document summarizes two projects in Hertfordshire, UK that aim to promote sustainable design and development: the SPECIAL project and the Building Futures project. The Building Futures project is a partnership between local planning authorities, led by Hertfordshire County Council, that aims to place sustainable design at the heart of new development planning. It has created a Sustainable Design Toolkit to provide guidance and consistency in decision making around sustainability. The toolkit can be used from the strategic planning phase through to post-development. The project also promotes expert design review panels and additional advisory services to address skills gaps and further advocacy, training, and cross-organization work on sustainability issues.