Devices, methods, and systems for determining a layout and wiring estimation for a heating, ventilation, and air conditioning (HVAC) system of a building are described herein. One method includes receiving information from a building information model associated with a building, receiving information from a pre-engineering tool associated with the building, and determining a layout and wiring estimation for an HVAC system of the building based, at least in part, on the information from the building information model and the information from the pre-engineering tool.