ProFutsal stormed into a 3-1 lead at half-time with goals from Sol Dobrin, Stanley Young and Ronan Ismaili.
Kew Park fought back to level the scores at 3-3 in the second half but a fantastic strike from Jake Morris secured a memorable win for ProFutsal.
The team, coached by Jon Kurrant and Tamas Gyenei, started their road to the finals with a win against other Hertfordshire teams in January and went on to win a further two rounds in Bedfordshire and then Birmingham to reach the final.
Kurrant, who is also head coach and chairman of the club, said: “It is a pleasure and a privilege to work with these boys. Half the squad is aged under 13 and playing two years up. They performed superbly, and the other half were seamless U14s who have an extremely bright future in the game.
“I’d like to thank our supportive parents, sponsor TMS, and our coaching team, especially Tamas who has helped shape, structure and guide these youngsters into young but mature futsal players with great game intelligence.”