Home depot farmhouse sink requires a deep U-shaped cut to seat the front of the sink. Most kitchen cabinets are too tall to provide this, which means cabinets need to be made to measure to accommodate the farm sink, or modification should be done in existing cabinets. Another consideration when installing the farm sink is the weight of the sink, which requires additional support.
Make a template for the front of the cabinet face. There may be a template supplied with the home depot farmhouse sink. If not, you can make your own template by fixing the farm sink, face down, on a piece of cardboard. Draw the outline of the sink on the cardboard. If the sink in the cottage has a lip, consider its location in the template, so you can make the appropriate adjustment when cutting the front of the cabinet. Cut the cardboard template, and hold it against the front of the sink. If it is not exactly accurate, make adjustments to correct.
Place the cardboard template against the face of the kitchen cabinet, where the sink will be set. Draw the outline of the template on the cabinet. Cut the cabinet, using a saber saw, along the drawn line. Add support to your cabinet to maintain the extra weight of the sink. Brackets and additional instructions may come with your home depot farmhouse sink. If not, two accounting books inside the cabinet, for the sink to rest. Place the accounting books so that each will be on opposite sides of the sink when the farm sink is in the closet.