Compound wall means a wall separating two independent plots. It may be built by the two neighbours jointly.Compound wall and boundary wall are not the same thing . A wall is reffered to as a compound wall if it is enclosed or forms a closed figure as in our house (neglecting the gate) whereas on the other hand a wall which doesn't forms a closed figure or not enclosed is reffered to as a boundary wall.If a plot of land is inclined to the south, west or southwest and there are no existing adjacent constructions, first level your property according to the principles of Vaastu Shastra and build a composite wall before starting construction of the main building.A wall is reffered to as a compound wall if it is enclosed or forms a closed figure as in our house (neglecting the gate) whereas on the other hand a wall which doesn't forms a closed figure or not enclosed is reffered to as a boundary wall.