A “clicking noise in wall” can be caused by loose pipes, wires, or fixtures vibrating, thermal expansion or contraction of materials, settling of the building, faulty electrical switches or outlets, or loose drywall or plaster. Pipes and wires can rub against each other or vibrate when water flows or electricity runs. Temperature changes can cause materials to expand or contract, creating noise. Building movement or newly constructed structures can lead to creaking sounds. Malfunctioning electrical components can hum or buzz. Loose drywall or plaster may rattle when touched or vibrated.