Cornwall’s Treveth becomes one of the first UK developers to achieve B Corp status Cornish developer Treveth has been awarded the prestigious, and globally recognised, B Corporation (B Corp) certification after taking the lead on bringing sustainable new build homes and commercial developments to Cornwall, for Cornish people. Just four years after its launch, Treveth has become one of the first developers in the UK to achieve the rigorous requirements of the respected B Corp certification.