In 2008, Lambert launched a new independent production company,
Studio Lambert, based in London and Los Angeles. In the 2024 Broadcast survey of independent UK production companies, Studio Lambert ranked #3 by size of turnover. It has been named Best Independent Production Company three times at the
Broadcast Awards and won Production Company of the Year at the Edinburgh TV Awards 2024. Lambert's first major formatted show in his new company was
Undercover Boss, which started on Britain's
Channel 4 in 2009 and has been produced in dozens of countries around the world. Studio Lambert produces an American version which premiered on
CBS in February 2010 immediately after the
Super Bowl to a record-breaking audience of nearly 40 million viewers. It went on to become the highest rating new show of the 2009-10 television season with an average audience of 17 million viewers and to earn an
Emmy Awards nomination for Outstanding Reality Program every year from 2010 to 2016, winning the category in 2012 and 2013. In March 2013, Studio Lambert launched
Gogglebox on Channel 4, a weekly show observing ordinary people watching and reviewing the week's television. It has become "one of Britain's most popular shows", winning many awards including a BAFTA and five National Television Awards and local versions are produced in more than thirty countries. Lambert launched a scripted division in his company in 2015. The first scripted show,
Three Girls, won five BAFTA awards. This was followed by
The Feed for Amazon Prime,
The Nest and
Three Families for BBC One, and three seasons of
Boarders for
BBC Three. Recent unscripted successes include
The Traitors and
Race Across the World. In 2025, nearly 10 million viewers watched the finale of
The Traitors.
Race Across the World is the biggest factual title on the BBC so far in 2025. Both shows have won BAFTA Awards. Other Studio Lambert productions include
The Circle,
Naked Attraction and
Four in a Bed. In 2023, Stephen Lambert was an executive producer on
Squid Game: The Challenge for
Netflix. The show was No. 1 on Netflix’s list of Top 10 English-language show for the first two weeks after its release, with a total of over 224 million hours watched within the first 21 days. On 6 December 2023, prior to the release of the season one finale, Netflix announced a second season order. ==Personal life==