Sergey Frolovichev, the Russian entrepreneur who helped grow Bumble and Badoo, has put his 14 ,501‑sq‑ft Hampstead mansion on the market for £29.95 million. The property, bought in 2005 for £13.35 million, now boasts a $15 million, five‑year‑old Batcave inspired by The Dark Knight and a host of high‑tech amenities.

£15 milion Batcave: A Five‑Year Build for Gadget Enthusiasts

The centerpiece of the sale is a secret basement accessed by retractable floorboards in the games room. According to the listing, Frolovichev spent £15 million and five years constructing a space that mirrors the Batcave from the 2008 film. The corridor, lined with display cabinets, leads to a workshop or studio that could host anything from crime‑fighting gadgets to PowerPoint presentations.

Hampstead’s Neo‑Georgian Home:From 1934 to Modern Marvel

Built in 1934 by architect Charles Henry Bourne Quennell, the neo‑Georgian house has been extensively upgraded. The property is now fully plumbed, wired and heated with an energy‑efficient ground‑source system, underfloor heating and MVHR ventilation. The subterranean plant room houses almost four dozen control panels, a setup that could rival a mid‑sized office block.

Luxury Features Beyond the Batcave

Beyond the secret basement, the house offers a swimming pool that can be drained into a dancefloor, a car stacker, a main bedroom spanning the house’s width with two roof terraces, six reception rooms, a triple‑heiight entrance hall, a media room, a health spa, a steam room and a sauna . The lower ground floor hosts a games room with a cocktail bar and a cinema room for late‑night Batman marathons.

Shell‑and‑Core Condition : Buyers Must Finish the Build

Agents Draper London describe the property as ‘shell and core’. While the structure is complete, buyers will need to finish the interior work themselves. The house is future‑proofed with its own well and a well‑designed back garden, but the onus for final touches falls on the new owner.

Who Will Take Over the Batcave Legacy?

Frolovichev, who has lived in the UK for two decades, is calling time on the rebuild. The listing leaves open the question of who will inherit the Batcave and decide whether to keep the gadget‑laden design or repurpose the space for more conventional uses. As of now, the buyer’s imagination will shape the final outcome.