Driving for AmD Tuning, the 32-year-old Scot took fifth in the overall standings in 2019. He claimed three overall wins and six podiums on his way to the privateers’ trophy.
He said the decision to rejoin Motorbase, the team where he made his tin-top debut in in 2017, was the right choice for 2020.
Butcher said: “[Team principal] David Bartrum and Motorbase launched me on my British touring car journey, and it feels like ‘coming home’ to go back to the team.
“There are some very exciting plans for the 2020 season and to be in on the ground floor of those developments really motivates me. I have tasted glory in the Independents Trophy, which was a huge achievement, but my sights are set higher. I want more wins, and the overall championship is my aim.
“I know that I might not have the touring car experience of some of the guys out there in but I am working relentlessly to absorb all the information I can and push myself, and Motorbase, forward to go for the biggest prizes we can reach.”
Motorbase will enter its ninth season with the Ford Focus and Butcher will join the returning Ollie Jackson in the Kent team’s line up.
Bartrum said: “I’m delighted to welcome Rory back for 2020. We have worked with Rory in GTs in the past and saw his abilities then which lead to us giving him his BTCC debut in 2017.
“We’ve obviously kept a very close eye on his progression since then. Over the last two seasons, he’s learnt a lot and has matured into a driver capable of a championship challenge.
“With Ollie and Rory, we have a great pairing to work with and we’re confident going into the new season. I have quoted on a couple of occasions that Rory was only ever ‘on loan’ and would be back with us one day.”
Both drivers will kick off their campaign in the opening meeting of the British Touring Car Championship season at Donington Park on March 28-29.
2020 BTCC grid so far:
Team Dynamics Honda Civic Type R FK8: Dan Cammish, Matt Neal
WSR BMW 330i M Sport: Andrew Jordan, Colin Turkington, Tom Oliphant
AmDTuning Honda Civic FK2: Jake Hill, Sam Osborne
BTC Racing Honda Civic FK8: Tom Chilton, Josh Cook, Michael Crees
Motorbase Performance Ford Focus RS: Rory Butcher, Ollie Jackson
Laser Tools Racing Infiniti Q50: Aiden Moffat, Ash Sutton
Trade Price Cars Racing Audi S3: James Gornall, Bobby Thompson
Team Hard VW CC: Mike Bushell, Jack Goff
Team Hard BMW 125i M Sport: Carl Boardley
Ciceley Motorsport Mercedes-Benz A-Class: Adam Morgan, Dan Rowbottom
Excelr8 Motorsport Hyundai i20 N Fastback Performance: Senna Proctor