The cost to install a sewer ejector pump can vary depending on several factors, including the size and type of pump, the complexity of installation, and any additional plumbing or electrical work required. On average, you can expect to pay between $900 and $2000 for the installation of a sewer ejector pump. This estimate includes the cost of the pump itself, as well as any necessary plumbing modifications, electrical connections, and labor. However, it's important to note that the exact cost will depend on various factors, such as the distance from the pump to the main sewer line, the condition of your existing plumbing, and any additional requirements specific to your property. To get a more accurate estimate, it's recommended to consult with a qualified plumber who can assess your specific needs and provide a detailed quote based on the scope of the installation.