Yes, a vegetable garden does add value to a house. Vegetable gardens can be used as an outdoor space for relaxation and recreation. They also provide fresh produce that is more nutritious than what you find at the grocery store.
No, a vegetable garden does not add value to a house. Vegetable gardens require lots of time and energy to maintain and upkeep. Moreover, they are not aesthetically pleasing for everyone who sees them from the outside of your home.