The agency will create an online marketing strategy for the double glazing, conservatories and kitchens supplier, initially focusing on everest.co.uk.
Everest last year appointed BIO to its digital account after a four-way pitch against Twentysix London, POD1 and SPF15.
One of the first projects for Twentysix will be developing a new standalone kitchens site. The brief also entails SEO consultancy, and helping to build online creative for Everest's advertising campaigns.