“house blend” seems to describe a blend brought to as little darker roast than a “breakfast blend” though not nearly as dark as blends labeled “espresso roast” or “French roast.” Finally, house blends, unique or not, are generally expected to offer value to the customer.
French roast coffee refers to a particular type of dark roast coffee. As its name suggests, French roast has a high roast level, resulting in coffee beans that have a roasted flavor, and contrary to other light roast popular types of roasted coffee, French roast coffee does not have an acidic flavor
Colombian coffee also has a dark roast used to make rich espresso blends. Remember that the roast of the coffee is not actually related to the growth of the coffee. Colombia is famous for its coffee beans, which can be used to make both light roasts and dark roasts. Now, the richer and flowery flavor of Colombian coffee beans does make them especially suited for a dark roast, but light roasts made from Colombian beans are also amazing.