Contact the local zoning office for home building projects. Determine the restrictions, building permit requirements and other important details that might affect the garage addition.
Assess the current garage space available. Determine which areas of the garage function well and which areas need improvement.
Identify the uses for the garage. Determine the vehicles you wish to park in the garage, including any boats or RVs. Consider storage, workshop space and other uses needed for the garage. Decide if you want to add a second level to the garage for a loft space or apartment.
Measure the length and width of the current garage. Determine how much additional space you need to accommodate your wish list for the garage. Consider the size of the home, making sure the dimensions of the garage are proportionate to the house.
Draw a sketch of the current garage and the proposed garage expansion. Pencil in the different functional areas of the garage.
Plan the electrical needs for the garage. Expanding the garage may require additional electrical sources. Consider if you will add plumbing, heating or cooling to the area.
Decide on the type of storage for the garage. Consider shelves, a work bench, specialty storage units and overhead storage.
Choose the exterior details on the garage. Implement the style and design of the home into the garage design for a unified look.