The Hello star had a meeting about the project earlier this month and will spend much of this summer writing the record.
She is working towards a release date of Christmas 2019.
Adele’s meeting took place at Sony’s London HQ.
A music insider said: “She’s back in the UK and intends to write here. A number of studio musicians have been approached to work with her and she’s already penned some of the songs.”
Adele, mum to five-year-old Angelo, completed a world tour in 2016 and told fans to expect a long break before her return.
But she toured Australia and New Zealand last year and also played Wembley Stadium twice.
Now she will return to the studio sooner than expected.
Adele is one of the world’s top-selling musicians, shifting over 100million records.
Her 2015 disc 25 went 11 times platinum. Second album 21 is the UK’s fourth highest seller.