The answer to this question depends on several factors.

First, the size of the enlargement is a major factor in cost. If it is necessary to build a new foundation, you will incur significant cost. If the enlargement is smaller and can be handled with a post foundation or a bump-out, the cost would be much less. If you must reconfigure another room of the house — the dining room, for example — you will need to add this cost to the project, as well.

Second, the design would be an important factor. If plumbing must be added or plumbing fixtures (sinks, dishwasher) moved, or if a gas line must be moved, this will add a large cost to the remodel. Moving the kitchen to another area of the house, however, will also include the cost of new pipes, drains, plumbing connections, and fixture connections.

Third, you must consider convenience in where the kitchen is located, particularly in proximity to the dining room and to the primary living and entertaining areas of your home. A badly located kitchen can be very inconvenient, and this inconvenience is one you will live with for many years. If you convert your garage to a new kitchen, you must also consider the inconvenience of parking in the open and access from that space to the dining room.