The purpose of this project is to allow a free movement of Building Management System (BMS) operator in all controlled building area. The current state of the problem consists in an impossibility of operator's movement from control centre. We found a solution in using of mobile devices like PDA with a client of BMS to allow a remote access to all alarms of system. Solution consist in use of web services and web methods interface on BMS server, where is possible to connect a remote PDA client to interchange a requested info about alarms and trends. A web services and mobile client application was created using a Microsoft Visual Studio 2008. Future trends are also discussed to provide a solution for small and mid size constructions in direction of use a Microsoft .NET Micro Framework.