Saracens director of rugby Mark McCall has said that he is "delighted" to have secured Brad Barritt on a longer deal.
The 26-year-old said that it was an "easy decision" to extend his stay at Vicarage Road, while McCall described the England centre as "talented, skilful and courageous".
"Brad is one of many players who have provided outstanding service to Saracens over the past three seasons," said the 44-year-old.
"He is talented, skilful and courageous, and we are delighted he has committed his future to the cause."
Barritt joined the club from South African side Natal Sharks in 2008.