Dispatched for a fire alarm activation. Upon our arrival, it was noted that the residence is secured and unoccupied. Evidence of construction activity inside of the structure is visually noted from the exterior of the structure. A 360 degree scene size up and investigation was completed visually and with the thermal imaging camera. No indications of a fire and/ or excessive heat are noted. A second investigation is completed with no fire confirmed. Attempts to contact the homeowner are unsuccessful. All units cleared the scene and returned to quarters.