With the rapid and fast development in the field of wireless technology, people life nowadays has undergone a great change. In recent time, comfort and safety of building environment have been become one of the biggest universal concern. However, fire is one of the greatest threats that has to be consider for building the safety measures. Based on consideration of this current issue on building security, we have proposed a new idea for monitoring fire in building using ZigBee network and ZigBee-WiFi gateway. This would transform ZigBee network into WiFi network. The structure of the proposed system and its advantages over the existing system is discussed in the pape. © BEIESP.