It takes a fairly wide area if you want to build a play garden for kids. This is because in the play garden will usually be placed some rather large game, such as a mini house, swings, a sandbox, and a few other supplies.
Average land needed to build the play garden for kids to reach half of the main house. However, if the condition is not possible, you can build a playground with a size that is not too big. This of course must be tailored to the needs.
As for some of the main game should not be too much because it will cause deterioration of the area that could result in children not focus on the game they did. Therefore, this should really be considered.