PHOENIX -- For each of his 12 seasons in the NASCAR Sprint Cup Series, Kevin Harvick has driven for Richard Childress Racing.

That will change in 2014.

Multiple NASCAR industry sources confirmed to ESPN.com on Friday that Harvick has signed a multiyear agreement to drive for Stewart-Haas Racing beginning with the 2014 season.

Harvick will remain at RCR in the No. 29 Chevrolet for the 2013 campaign, sources said.

"I'm looking forward to finishing out this season on a strong note with RCR and continuing to build our program going into the 2013 season with the ultimate goal of winning a championship," Harvick told ESPN.com on Friday at Phoenix International Raceway, when he was asked about his future. "Anything beyond that, once I know what my future plans are set, I'll let you know."

RCR owner Richard Childress obviously was irritated by the report.

"I've got a contract for 2013 and this is 2012,'' Childress said. "I'm not talking to you about nothing (regarding that).''

Asked if Harvick has told him he will not drive for RCR beyond 2013, Childress said, "You need to go talk to them people. Don't talk to me about it.''

Under Stewart-Haas' plan, sources said, Harvick will drive a fourth SHR Chevrolet, teaming with Tony Stewart, Ryan Newman and Danica Patrick to form a four-car stable.

Kevin Harvick will join Stewart-Haas Racing in 2014. Jerry Markland/NASCAR/Getty Images

"Stewart-Haas Racing's driver lineup is all set for 2013, but if you're talking about 2014 and if Kevin Harvick is available, that's something the team would have to look at," SHR team spokesman Mike Arning said. "Any team in this garage would do the same.

"From the moment Stewart-Haas Racing was formed, becoming a four-car team is something it's been striving for. They have the infrastructure to accommodate a fourth team, and if everything aligns properly, it's something they'll do. So, if a driver the caliber of Kevin Harvick is available, it's something they would pursue."

Harvick's Cup career began in 2001, when he stepped into the most famous race car on the track and one of the most famous race cars the sport ever had known -- Dale Earnhardt's Chevrolet.

When Earnhardt died in the final corner of the 2001 Daytona 500, Childress called on the then-Busch Series up-and-comer to take over. The car's number was changed to 29, and three races later, Harvick was a Cup Series winner.

In all, he has 18 career victories at NASCAR's top level.

Harvick contemplated leaving RCR the previous time his contract was up in 2010. But in good faith, he chose to remain with the man who gave him an opportunity at the big time.

But this time around, sources noted, Harvick believes Stewart has the ability to motivate him, and that was a critical factor in his decision.

It is not unprecedented for a driver to sign with a team a full year before joining it.