If you have a house, not an apartment, it is important to arrange the center of the entrance – the hall. As the saying goes, the size of the entry hall and foyer shows the lifestyle of the home host and his wealth. If the guests will often visit you, a large entry hall will be useful.
If there is not planned the flood of guests, then you will feel comfortable in a smaller space knowing that did not pay too much for the unused area of the house. 4-10 square meters will be enough.
I’d recommend making an entrance hall with a foyer, then opening the outside door in the cool time you will avoid the loss of the inside warmth, crosswinds.
If your finances are limiting you, give up the garage and spend money on the better quality materials for interior decoration.