The One Direction singer is said to have moved out of his East End flat in order to be nearer friends in the Primrose Hill area.
"A lot of Harry's friends live in Primrose Hill and Belsize Park, so he wanted to move closer to them," an insider told The Sun.
"The new house is enormous compared to his old flat.
"It has four bedrooms and as many bathrooms, as well as a few huge, open-plan living areas. It's the perfect party pad."
Styles has reportedly told friends that he will stage a big house-warming party at his new place of residence.
"The band are really going to let their hair down, Harry-style.
"The house has a gorgeous garden and high walls, so Harry won't have fans watching his every move.
"He's already been spending lots of time in the area and becoming a regular in the local pubs."
Harry Styles had been spotted flat hunting with bandmate Liam Payne earlier this year.
One Direction recently announced that they will take part in a BBC Radio 1 station takeover on Saturday, October 6.
In pictures - Harry Styles's rumoured girlfriends: