Southwick and Eastbourne United were relegated from County League division one after Redhill beat Whitehawk 3-0 last night.
Goals from Glen Barlow (two) and Germain Amanuel, on loan from Lewes, kept Redhill up.
Redhill boss Bill Tucker said: "I am pleased for my lads. They knew what they had to do and they did it."
Results, Division one: Burgess Hill v Ringmer pp, Three Bridges 1 (Massaro 40) Sidley 4 (Rose 28, Balch 60, Baker 61,66), Whitehawk 0 Redhill 3 (Barlow 32,61, Amanuel 72).
Division two: Shinewater 0 Rye United (Miles 30, S.Willard 40), Westfield 1 (Jones 21) Wealden 3 (D.Brown 13,68,90).
Division three: Haywards Heath 0 Crowborough 4 (Evans 57, Singer 60, Meek 65, Bishop 69), TSC v Forest pp.
Crawley Town have announced they will be playing a pre-season friendly against Albion at the Broadfield Stadium on Saturday July 20.
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