The agency will handle brand development and positioning in addition to creative activity. M&C Saatchi London will work across TV, press, digital and CRM.
Gareth Williams, the chief executive of Sofa.com, led the review.
Campaign revealed in March that Sofa.com was looking for an agency to oversee its advertising and CRM to boost its presence in the UK.
Big Fish created Sofa.com’s most recent TV campaign, which promoted the brand’s 14-day free-returns policy and the location of its showrooms in the UK, the US and the Netherlands.