A high-tech Hampstead mansion complete with a secret Batman-inspired underground workshop, hidden staircase and car-lift garage has been launched onto the market for £29.95 million by tech entrepreneur Sergey Frolovichev.
The sprawling neo-Georgian residence on Greenaway Gardens in north London has been custom designed by Frolovichev – a former business associate of Bumble and Badoo founder Andrey Andreev – in collaboration with award-winning architectural practice SHH.
The mansion, extending to around 14,500 sq ft, is being sold through sole agent Draper London on a shell-and-core basis, allowing an incoming billionaire buyer to complete the interiors to their own specification.
Frolovichev and Andreev were instrumental in the rapid international expansion of dating platforms including Bumble and Badoo before their holding company, now Bumble Inc., was sold in 2019 to Blackstone in a deal valuing the business at around $3 billion.
FUTURE-PROOF INFRASTRUCTURE
Now, one of Hampstead’s most ambitious private residential projects is coming to market after significant investment into its structural engineering and future-proofed technological infrastructure.

Behind the retained 1930s façade lies a vast ambassadorial-style home featuring seven bedroom suites, six reception rooms, a triple-height atrium entrance hall, indoor swimming pool, spa complex, gymnasium, media room and extensive entertainment terraces overlooking landscaped gardens.
However, the property’s standout feature is arguably its underground “Batcave-style” design workshop – directly inspired by Christopher Nolan’s 2008 blockbuster The Dark Knight.

Image Credit: Draper London/SHH
Accessed through a concealed staircase hidden beneath retractable floorboards in the games room, the subterranean studio was designed as a secure and highly private technology workspace where Frolovichev could develop new digital and mechanical concepts.

Image Credit: Draper London/SHH
The lower ground floor also includes a cocktail bar, cinema room, wellness spa and car storage system accessed via an integrated vehicle lift.
TECH AND SUSTAINABILITY
The mansion has been designed with a heavy emphasis on technology and sustainability, including ground source heating boreholes, comfort cooling, underfloor heating, integrated audio-visual systems and advanced communications infrastructure.

Image Credit: Draper London/SHH
Industry sources suggest the incoming buyer could spend a further £5 million to £7 million completing the interior fit-out and dressing the home, with the finished mansion potentially worth in excess of £40 million once completed.
The property sits on one of Hampstead’s most prestigious residential roads, an area long favoured by international billionaires, hedge fund executives and technology entrepreneurs seeking privacy within easy reach of central London.
TROPHY MANSION

Craig Draper, Founder and Managing Director of Draper London says: “Custom designed by tech entrepreneur Sergey Frolovichev in collaboration with architectural practice SHH this unique trophy mansion on Greenaway Gardens provides an extraordinary opportunity for an incoming purchaser to enjoy the pleasurable finishing elements of such a project where the heavy lifting has been completed a superlative level of quality.
“Located on one of Hampstead’s most sought after addresses, the mansion could appeal to a wide range of potential buyers including a tech entrepreneur like Sergey, a local London family, an international family relocating for schools or a billionaire businessperson who enjoys working from both home and the office.”
FLAWLESS DESIGN
Draper adds: “The flawless design of the mansion offers contemporary, open plan style living on all floors, providing an outstanding trophy residence that will appeal to an ultra-high-net-worth individual who wants privacy and the opportunity to imprint their own vision on this important property.
“This sale offers a once in a generation opportunity to create one of the finest new residences in Hampstead.”





