Abstract: A system and method for the detection of an intruder in an area under construction is disclosed. The self-contained portable deterrent alarm system includes a plurality of means for detecting an intruder and broadcasting at least one of an audible siren or audible voice alarm. The system and method further include, in response to receiving a triggering signal, establishing a telephone communication to a monitoring center to report an intrusion at the construction site. The system is adapted for quick install, removal and relocation to an alternate construction area.