The Carbon Neutral Buildings Project was a multi-strand study in which CPPU collaborated with two other research groups within Civil Engineering, UCC. The project was concerned with the exploration of business, technical and technological strategies for carbon-neutral building businesses. The project involved: ex ante measurement and computer modeling of the performance of three demonstration buildings; Identification and invention of energy retrofit solutions; multidimensional lifecycle evaluation of alternatives; and ex post evaluation of each building. Parallel and complementary to this work a review was undertaken of the policy context for carbon neutral renovations to identify potential policy barriers.