The forward has put pen to paper on a two-year deal, keeping him at West Ham until June 2017.
Speaking on the official site after committing his immediate future to the Hammers, Parfitt-Williams, who was the U18’s top goal scorer this season with nine strikes, said: “Ever since I was young I’ve always wanted to be a professional footballer, so it feels really good.
“It’s nice to see my hard work recognised. I do a lot of extra training and I’m always watching football. For my hard work to come out on the pitch is excellent.
“I’ve known the contract was coming for a while, so it’s nice to finally sign it. It felt kind of weird.”
Parfitt-Williams’ impressive performances culminated in his nomination for the prestigious Dylan Tombides Award at this year’s Player Awards.