Billericay Town are the Isthmian Premier League champions and have now done the treble.
They beat Harlow Town 2-0 last night.
The side will play their football in the National League South next season.
Elsewhere Southend United have moved back into League One’s top half with a 3-0 win at Oldham.
Chelmsford City have guaranteed a National League South play off spot with a 1-0 win at Bognor Regis.
Also in that division, Braintree drew 0-0 with Oxford City and Concord Rangers beat Hungerford 1-0.