Not always. The cost of the site may be a one-time expense or there may be continuous expenses to consider. These include hosting, domain renewal, security certificate, maintenance, updates and optional support. Whether you have to pay for this website depends on how it's being created and what services are included. Some of the website builders have monthly plans and custom websites might have different development and maintenance charges. Before getting off the phone with the realtor, be sure to ask specifically what is covered in the first price and what costs will be incurred later.