Typically, a farmhouse sink is installed after the countertop is in place. The installation process for a farmhouse sink involves cutting a specific opening in the countertop to accommodate the sink's size and shape. This cutout is usually made after the countertop has been installed to ensure precise measurements and a proper fit.
The countertop material is then finished around the edges of the sink to create a seamless and attractive look. This process may involve using caulk or adhesive to secure the sink to the countertop and creating a watertight seal.
It's important to note that the specific installation process may vary depending on the sink and countertop materials being used. It's always recommended to follow the manufacturer's instructions and consult with a professional if you're unsure about the installation process.