Mary Sumner House

Mary Sumner House is a distinctive conference and meeting venue in the heart of Westminster, London. Set within a historic Grade II listed building, it offers a memorable alternative to conventional corporate spaces, with period details, stained glass, original wood panelling and a strong sense of purpose throughout the building.

The venue provides eight named meeting rooms alongside a larger Conference Hall, supporting a broad range of event formats. Organisers can book spaces for private interviews, board meetings, training sessions, workshops, stakeholder meetings, AGMs, leadership away days and conferences. Capacities begin with intimate rooms for around six delegates and extend to a theatre-style layout for up to 120 guests. Rooms can be arranged in boardroom, classroom, cabaret, U-shape or theatre formats, allowing the layout to reflect the objectives of each gathering.

Facilities include display screens in the meeting rooms, while the Conference Hall offers presentation and audio equipment suitable for larger sessions. Additional audiovisual support can be arranged for hybrid meetings and panel discussions. The team also offers flexible refreshment and catering arrangements, including tea, coffee and biscuits, with organisers welcome to bring their own caterer or choose from recommended suppliers.

Located close to Westminster Abbey, Parliament Square and the Houses of Parliament, Mary Sumner House is well connected by Underground and mainline rail services. Step-free entry, lift access and accessible toilets help support inclusive event planning. Revenue from venue hire contributes to the wider work of Mothers’ Union, giving organisers the opportunity to host a professional event while supporting an international charitable mission.