In the present work, an extremely responsive and cost-effective Liquified Petroleum Gas (LPG) sensor operating at room temperature has been fabricated with indium-doped SnO2 nanospheres. In/SnO2 was prepared via cost effective sol-gel route and thin films were fabricated using spin-coating technique. Further, the sample was characterized to study the elemental information, crystal structure, phase formation, morphology, optical absorption, etc through EDS, XRD, TEM, SEM, Raman, FTIR and UV–visible spectroscopy. The sensing characteristics of In/SnO2 thin film have been studied and it was found quite useful to detect the LPG below LEL (0.5–2.0 vol%). The maximum value of % sensor response was found 365.11 at 2.0 vol% whereas the minimum response and recovery times were found as 10 s and 14 s for 0.5 vol% of LPG.