Abstract: Methods, systems, and computer program products for monitoring a building pressurization without penetrating an envelope of a building. The system includes one or more processors and a memory coupled to the processors. The memory stores data comprising program code that, when executed by the processors, causes the system to receive at least one interior pressure signal from at least one interior pressure sensor and at least one exterior pressure signal from at least one exterior pressure sensor, where at least one of the at least one interior pressure signal and the at least one exterior pressure signal are received wirelessly. The system determines an interior pressure value based on the at least one interior pressure signal and an exterior pressure value based on the at least one exterior pressure signal. The system calculates the building pressurization based on a difference between the interior pressure value and the exterior pressure value.