The Vaults at One Marylebone

Beneath Sir John Soane’s Grade I-listed church, The Vaults at One Marylebone occupy a two-level underground space with a mezzanine overlooking the main floor — 300 standing capacity in a setting designed for the part of the evening when formality gives way to celebration.

Layout and Character of One Marylebone’s Vaults

The main floor holds 200, the mezzanine level above takes 100, and the elevated perspective gives the space a layered quality that flat-floor venues lack. Crystal chandeliers and gilt mirrors bring visual richness to the subterranean setting, while the vaulted architecture creates natural acoustic character that enhances rather than fights against amplified sound. The atmosphere is deliberately different from the Soane Hall above — going underground at One Marylebone feels like entering a different world, and the venue leans into that contrast. Low ceilings relative to the church overhead create intimacy and intensity. The d&b audiotechnik sound system — professional-grade audio from one of the industry’s most respected manufacturers — fills the space with serious quality. This isn’t background music; it’s a system specified for events where sound matters. The space suits DJ setups, and the licensed-until-3am operation means events can run three or more hours past the point where most London venues have switched off the lights.

Events in The Vaults at One Marylebone

The Vaults’ primary role is as the after-party space following events in the Soane Hall or Galleries above. The natural flow at One Marylebone runs reception drinks in the Galleries (first floor), dinner in the Soane Hall (ground), party in The Vaults (underground) — each transition moving guests deeper into the building and further into the evening. The 3am licence is the operational feature that makes this work. Without it, the grandest dinner in Soane Hall would end with guests filing out at midnight. Standalone hire works too, particularly for events that are explicitly party-format from the start. Late-night corporate celebrations, Christmas parties, product launches wanting an immersive underground setting, private parties, and DJ-led events all book The Vaults independently. Seated capacity reaches 100, though the space works best in standing and social configurations where the mezzanine and main floor create flow between levels.

Practical Details for The Vaults

The Vaults connect to the Soane Hall via internal stairs, making the transition between dinner and after-party seamless for combined bookings. The space has its own bar and production capabilities including the d&b sound system and lighting. For events that start here rather than arriving from upstairs, the underground entrance creates its own sense of arrival and occasion. God’s Garden (outdoor, 80–200 guests, own bar and stage) and The Greenhouses (nine individually designed private dining spaces) provide additional elements for events using multiple spaces across the One Marylebone complex. The full venue combination — Soane Hall, Galleries, Vaults, and outdoor spaces — creates a multi-chapter event that moves guests through contrasting environments across an entire evening. One Marylebone sits opposite Great Portland Street tube station, with King’s Cross, Euston, and Paddington within a 10-minute taxi ride — the kind of central London accessibility that matters particularly for late-night events, when departure logistics are as important as arrival.