The incident happened yesterday when Amjad was digging the foundation when a wall collapsed and fell on him, said a senior police officer.
The wall was made 10-20 years back and was quite weak, added the officer.
The deceased succumbed at Safdarjung Hospital around 11pm last night, police said.
A case under sections 290 (punishment for public nuisance in cases not otherwise provided for), 304(A)(Causing death by negligence) IPC was registered and the owner of the plot Hawa Singh has been arrested, said the officer.