Yes, house plans can be changed or modified to suit the needs and preferences of the homeowner or builder. In fact, it's quite common for house plans to be modified or customized in some way to better fit a specific building site, lifestyle, or budget.
If you have purchased or obtained a set of house plans, you can work with a licensed architect or designer to make changes to the plans. The architect or designer can help you evaluate which modifications are feasible and provide advice on how to achieve the desired changes while ensuring that the structural integrity of the house is maintained. They may also need to obtain necessary permits and approvals from local building authorities to ensure that the modified plans comply with building codes and regulations.
It's important to keep in mind that modifying house plans can affect the cost and timeline of the building project, so it's a good idea to work closely with your architect or builder to ensure that the modifications are carefully planned and executed.