The trio from Brighton were on duty in Bognor when they were flagged down by a panicked member of the public.
PC Knight and PC Booth helped an elderly disabled couple down from their flat which was opposite the one ablaze and everyone was evacuated safely.
PC Sacha Patterson and his colleagues PC Melissa Knight and PC Sean Booth realised a block of flats was on fire, with smoke bellowing out from a third-floor flat into the hallways.
Without a moment of hesitation, the officers ran into the building and knocked on all the doors, helping residents to safety before the fire brigade arrived.
He said: “Without a moment’s hesitation, both PC Knight and PC Booth ran into the building to make sure everyone could get out safely.
“Melissa was only about five weeks into the job and Sean just two weeks.