Developer services customers’ experience

For the developer services markets to work effectively, it is important that water companies provide an excellent customer service to all of their developer services customers. As part of the 2019 price review we introduced the developer services measure of experience (D-MeX) which applies to the 17 largest water companies in England and Wales for the 2020-25 period.

D-MeX is designed to incentivise water companies to provide an excellent customer experience to their developer services customers, including small and large property developers, self-lay providers and those with new appointments and variations (NAVs). These customers can also include residential customers that have new mains connections installed.

More information is available on how D-MeX is calculated as well as the latest results on company performance against D-MeX.