Technique are very important because with the tricks and the knowledge you will same money and time. The most used materials for building objects are the bricks. For that purpose, you can learn a simple calculation that will give you the final number of bricks that you will need for some object. First of all, you should know how big are bricks, the doors, the door lintels, the windows, the window lintels. Also, the planned wall thickness. Then, you should calculate following the order on the picture below. Just insert your measurements and numbers and you will have the correct number for your project.