The series, directed by Guy Ritchie and starring Hero Fiennes Tiffin, Dónal Finn, and Colin Firth, utilized multiple Welsh sites for production. According to major media reports, a substantial portion of filming occurred at Great Point Studios in St Mellons, Cardiff, with the production team also using the Civic Centre in Cardiff city centre. The Merthyr Mawr Estate in Bridgend County stood in for the Holmes family's English country estate, while Bannau Brycheiniog served as the backdrop for a Chinese village.
Deon Du Preez, the supervising locations manager, stated, "The Chinese Village, script-wise, was interesting, but challenging. " The exact plot or storyline of the Young Sherlock series has not been disclosed. Young Sherlock joins other major TV productions filmed in Wales that premiered in 2026, including Netflix's Seven Dials and Sky's Under Salt Marsh.
The Chinese Village, script-wise, was interesting, but challenging. We did not have the budget to build a whole village for those flashback scenes.
Du Preez highlighted that Wales provides talent and locations for TV productions, with an abundance of Victorian buildings and estates offering budget-friendly filming sites. He described Merthyr Mawr as "a large privately owned estate known for its 19th Century manor house and picturesque historic village," located roughly 25 miles west of Cardiff, and mentioned filming various scenes throughout the village and within the estate's extensive woodland areas. The number of episodes in the Young Sherlock series remains unknown.
Once we realised the landscape of Brecon Beacons could be the landscape scale we needed, we built a Yurt Chinese Village which looked great.
Fighting the Welsh winter was a challenge for that build!
Located roughly 25 miles west of Cardiff, Merthyr Mawr is a large privately owned estate known for its 19th Century manor house and picturesque historic village.
We filmed various scenes throughout the village and within the estate's extensive woodland areas.