Beyond the Standard Model searches at HL-LHC

The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver the unprecedented integrated luminosity of 3~\iab at the centre-of-mass energy of 14~TeV. This will provide a unique opportunity in the Beyond the Standard Model searches program to explore still unknown physics scenarios. The full potential of the foreseen detectors upgrades can be exploited by new specialised strategies to detect new physics phenomena. In this context an overview of the BSM searches program planned by the ATLAS and CMS experiments is addressed highlitghing the sensitivity reaches and the possible improvements with respect to the current Run-2 results.