The move is among several high-level changes announced by the Kingfisher-owned company's new chief executive Ian Cheshire. B&Q says Roth will be leaving to concentrate on redeveloping his communications consultancy.
Roth was appointed B&Q marketing director in 2001 from Bates UK, where he was strategic planning director.
B&Q says a new customer proposition and marketing director will be recruited by the end of the year. It added Roth would continue to work with the company on a consultancy basis.
Other moves announced by Cheshire include bringing managing director of B&Q Asia, Steve Gilman, to work on format development for a three-month period. Gilman will continue to head up B&Q's Asia business during this time.
Finance and change programme director Keith Fleming will be replaced by Kingfisher strategy director Regis Schultz.
Cheshire was appointed chief executive earlier this month, after a stint as chief executive for international and development at Kingfisher. He replaced Rob Cissel who took on the role of chief executive for commercial and development at Kingfisher.
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