This is also the first season in which all divisions were renamed after league restructuring.
The Premier Division featured 16 clubs which competed in the Sussex County League Division One last season, along with four new clubs: Six clubs have applied for promotion to Step 4: Eastbourne Town, Horsham, Horsham YMCA, Lancing, Loxwood and Newhaven.
Division One featured ten clubs which competed in the Sussex County League Division Two last season, along with seven new clubs.
In addition, Burgess Hill & Hurst Albion split and reverted to their original names of Hurstpierpoint (remaining in this league) and Burgess Hill Albion (joining the Mid Sussex League), while Ifield changed its name to Ifield Galaxy.
Promotion and relegation to and from this division was irregular, due to ground grading issues and other league constitution aspects.