The defender has penned a new deal to 2030.
“I’m delighted that Kris has agreed a new deal,” said Brentford head coach Keith Andrews.
“He’s been here since the start of the Premier League era, and he’s played a big role at the club - not just on the pitch, but off it as well.
“Kris is a really popular character amongst the other players, and he’s an experienced player now.
“He’s someone who falls into a bracket I want to keep hold of, rather than looking elsewhere to sign players. Sometimes, as a coach, you can be too keen to look over the fence instead of looking at what’s already in your own garden.
“He has been a very versatile defender for us, and a big part of the culture of the group.”
