24 Hour Design is an American reality television series involving a team consisting of a host and designer, design assistant and a carpenter that help homeowners transform a single room. The show is shot in a single day, with a budget around $2,000.

Original episodes of 24 Hour Design began to air on HGTV October 6, 2006. The program's second season began July 10, 2007.

In each episode of 24 Hour Design, the host meets with the homeowners to discuss the redesign of their room. The team and homeowners work on the space together up until the final hour. In the final hour the designer transforms the room for the final reveal. The redesign usually consists of painting of the room and the construction a furniture piece.