A statement on the Isthmian League website said: "The Board of the Isthmian League met today and agreed- subject to government approval- that our football will start again on Saturday 19th December, so long as spectators are allowed to attend.
"The season will also be extended- to May 22nd, with the Playoffs scheduled for the following Bank Holiday weekend.
"If clubs would like to play a fixture prior to Saturday 19th, subject again to there being no government restrictions, then the League will agree so long as five days notice is given to enable match officials to be appointed.
"A letter from our Chairman, Nick Robinson, has just been sent to all clubs covering these details and much more besides. Club secretaries, please check your inbox!"
The season from Step 4 and below was paused when the country was put into a second lockdown.