WINDUR proposes a small vertical axis wind turbine(VAWT) optimised for use in urban environments as a roof-top mounted system. Proposed novel developments include(1) a variable speed control system develope to maximise VAWT4s energy yield under rapidly changing wind speeds,(2) aan aerodynamic design based on a helical rotor, refined for reducing rotor weight and loads on the roof, to lower WINDUR installation complexity and cost and(3) an assessment of wind resource in urban areas, for characterising those locations with better wind resources. WINDUR has a targeted performance of 0,35kWh/€ at on annual average wind speed of 6,5m/s for guaranteeing a Return on Investment (ROI) period shorter than 15 years