The investment of 3D visualization varies a lot from project to project. For example, producing 3D visualization of huge modern house with simple, straight lines and minimalistic furniture, can be cheaper then small rustically house with all sorts of small details and decorations. The more details, the more time it takes to make it, and the price goes up. The best solution for you is to send us all available references, so that we can provide you with detailed estimate for your project.