A 22-year-old man who was also arrested on suspicion of murder is undergoing treatment for injuries sustained before his arrest.
He remains under police guard in hospital.
A 49-year-old woman held suspected of murder was this week freed on police bail and is due to return to Woking Police Station on August 29.
Neil Tulley, 54, was discovered in Cedar Way, Guildford, Surrey, just after 10am on Tuesday, and a post-mortem examination found he died from multiple stab wounds.
The 14-year-old, who cannot be named for legal reasons, appeared at North Surrey Magistrates' Court today charged with murder, Surrey Police said.
He has been remanded into the care of social services and is due to appear at Guildford Crown Court on Tuesday.