YESSS, launched in 2012, has opened 85 branches in just 12 months and created 800 jobs, achieving turnover of more than £100m in the UK.
The two Leeds-based agencies beat two others in the joint pitch to become YESSS’s first retained agencies.
Umpf will handle consumer PR and social media and The Right Agency will be responsible for trade PR and the company’s customer magazine YESSS Express.
Umpf MD and founder Adrian Johnson said: "The company is unique in the sector in that it’s both an electrical wholesaler for trade buyers and a retail outlet for the public. This, alongside its new online shop, means that there’s a consumer story to tell."
He added that part of the brief is to "reach out to people who go to DIY stores".
Eloise Garrett, co-founder and director at The Right Agency, added: "YESSS is challenging the traditional wholesale model and doing things differently. It has achieved unprecedented growth in a short period of time, so we are really looking forward to telling its story."