The costs associated with property sales through traditional estate agents can vary from 1% to 3%, contingent on the selected service, and certain agencies in London may impose higher rates. On the other hand, online agencies usually have lower fees but often demand upfront payment, irrespective of whether your property is sold. Moreover, these online services may entail additional charges for standard services, such as accompanied viewings and property details, which are typically included in the offerings of traditional estate agencies.