
The one-year sponsorship deal starts from January 1 next year across C4, More 4, TV and PC VOD and channel4.com/4homes.
Other C4 programmes backed by the deal include Property Ladder and Relocation Relocation.
Jo Kenrick, the marketing and customer proposition director at B&Q, said: This is one of our biggest ever TV sponsorship deals, and an exciting move. Positioning B&Q alongside quality property programming will continue to encourage consumer re-evaluation of the brand.
The deal was negotiated by Newcast, a division of ZenithOptimedia, on behalf of B&Q.
Jacqui Peacock, an investment director at ZenithOptimedia, said: This is a fantastic opportunity to harness the credentials and synergies of the B&Q and Channel 4 brands and provides opportunities to explore further areas of activation.