Having been champions of Division Four two years ago, this was the under-15 B team's second success in three seasons.
This is an excellent achievement in a division where a strong Three Bridges side finished as champions after going through the season unbeaten.
Crawley Down lost just three games all season, twice to the champions and one other match two weeks ago when they had six players missing due to a compulsory Duke of Edinburgh's Award training day at Imberhorne School. Aside from the three defeats, the Hammers conceded just 10 goals in their other 15 league games including six clean sheets in the last nine matches.
They went to Holmbury on Saturday needing to avoid defeat to pip their hosts to promotion and the Hammers produced an excellent performance to run out convincing winners with goals from Joe Leslie 2, Max Thompson, captain James Grimwood and Kyle Marshall.