The inferno broke out in the 400 block of South Ithan Avenue in Bryn Mawr just after 11 p.m., fire officials said.
Crews from Radnor, Bryn Mawr, and surrounding fire companies rushed to the scene, battling the intense blaze as it spread through the large home.
Despite the severity of the fire, all occupants made it out safely, and no injuries have been reported.
South Ithan Avenue remains closed between Rolling Road and Bryn Mawr Avenue as emergency responders work at the scene. The fire has since been brought under control, authorities said.
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