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Construction started in 449 BCE, and some scholars believe the building not to have been completed for some three decades, funds and workers having been redirected towards the Parthenon. The western frieze was completed between 445–440 BC, while the eastern frieze, the western pediment and several changes in the building’s interior are dated by these scholars to 435–430 BC, largely on stylistic grounds. It was only during the Peace of Nicias (421–415 BC) that the roof was completed and the cult images were installed. The temple was officially inaugurated in 416–415 BC.
— https://en.wikipedia.org/wiki/Temple_of_Hephaestus

Photos by Luke Cabading.