An event space in a pub with wooden floors, high tables, exposed brick bar, and warm pendant lighting at O'Neill's St Mary Street Cardiff.
An upstairs event space in a pub with wooden floors, a central bar, and high tables at O'Neill's St Mary Street Cardiff.
An event space in a pub with wooden floors, a coffered ceiling, and tables covered in white linens at O'Neill's St Mary Street Cardiff.
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An event space in a pub with a dance floor, DJ lighting, and party decorations at O'Neill's St Mary Street Cardiff.
An upstairs event space with a live band performing on stage, colorful lighting, and a crowd at O'Neill's St Mary Street Cardiff.
An event space in a pub with wooden floors, covered tables, and a wall-mounted TV at O'Neill's St Mary Street Cardiff.
An upstairs event space with wooden floors, rectangular tables with white linens, and a wall-mounted TV at O'Neill's St Mary Street Cardiff.
An event space in a pub with wood flooring, framed wall art, and tables covered in white linens at O'Neill's St Mary Street Cardiff.
An event space in a pub with a live band stage, dance floor, party lighting, and large illuminated letters at O'Neill's St Mary Street Cardiff.
An event space in a pub with wooden ceilings, hanging lights, and large projection screens at O'Neill's St Mary Street Cardiff.
An event space in a pub with a small stage setup, drum kit, neon sign, and spotlights at O'Neill's St Mary Street Cardiff.
An event space in a pub with mixed wooden chairs, framed posters, and a projection screen at O'Neill's St Mary Street Cardiff.
An event space in a pub with wooden floors, pendant lighting, and large projection screens at O'Neill's St Mary Street Cardiff.
An event space in a pub with wooden tables, bench seating, and wall-mounted TVs at O'Neill's St Mary Street Cardiff.
An event space in a pub with bottles of prosecco, champagne flutes, and red napkins on a wooden table at O'Neill's St Mary Street Cardiff.
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An event space in a pub with a long wooden bar, exposed brick wall, and hanging lantern lights at O'Neill's St Mary Street Cardiff.
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Champagne bottles in a silver ice bucket at O'Neill's St Mary Street Cardiff
An event space in a pub with wooden tables, leather benches, and a display of spirits at O'Neill's St Mary Street Cardiff.
An event space in a pub with high tables, bench seating, wall art, and pendant lighting at O'Neill's St Mary Street Cardiff.
An event space in a pub with dark wooden tables, leather chairs, and a large projection screen at O'Neill's St Mary Street Cardiff.
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An upstairs event space in a pub with wooden floors, long tables set with glassware, and wall-mounted screens at O'Neill's St Mary Street Cardiff.
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A pub with ornate stone columns, arched windows, and branded signage at O'Neill's St Mary Street Cardiff.
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Casual pub food including pizzas, burgers, fries, wings, and beers on wooden tables at O'Neill's St Mary Street Cardiff.
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A pub exterior with decorative stone columns, large arched windows, and wooden planters at O'Neill's St Mary Street Cardiff.

Upstairs Room at O'Neill's St Mary Street Cardiff

Event Space in a Pub
·
Private space
85-87 St Mary St, Cardiff, Cardiff, CF10 1DW –
Cardiff Centre
Up to 80
seats
Up to 300
standing
Venue offers catering
External catering not allowed

About this space

Our first-floor space at O'Neill's St Mary Street is the ideal venue for any occasion—whether it's a meeting, an all-day conference, a Christmas or engagement party, a milestone birthday, a networking event, a live music night, or even stand-up comedy. With a capacity of up to 300 standing, the room features a private bar, multiple screens, a projector, a flip chart, and a full PA system.

This flexible venue can be tailored to suit any event, whether you're hosting a daytime meeting, evening celebration (birthday, engagement or graduation party), pre-concert gathering, sports screening, or live music night. Enhance the experience with a buffet or drinks reception. The upstairs room also features a private entrance, adding an exclusive touch. Whatever the occasion, O'Neill's St Mary Street has you covered.

*Please note this is not an accessible space, step access*

Offers and packages

Menus

 Drinks menu
Christmas menu

Prices

Monday
9:00 – 23:00
from £400–£600 min. spend
Per session
9:00 – 17:00
from £400 min. spend
Per session
17:00 – 23:00
from £600 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Tuesday
9:00 – 23:00
from £400–£600 min. spend
Per session
9:00 – 17:00
from £400 min. spend
Per session
17:00 – 23:00
from £600 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Wednesday
9:00 – 0:00
from £400–£600 min. spend
Per session
9:00 – 17:00
from £400 min. spend
Per session
17:00 – 0:00
from £600 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Thursday
9:00 – 0:00
from £400–£600 min. spend
Per session
9:00 – 17:00
from £400 min. spend
Per session
17:00 – 0:00
from £600 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Friday
9:00 – 1:00
from £500–£800 min. spend
Per session
9:00 – 17:00
from £500 min. spend
Per session
17:00 – 1:00
from £800 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Saturday
9:00 – 1:00
from £500–£800 min. spend
Per session
9:00 – 17:00
from £500 min. spend
Per session
17:00 – 1:00
from £800 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Sunday
9:00 – 23:00
from £400–£600 min. spend
Per session
9:00 – 17:00
from £400 min. spend
Per session
17:00 – 23:00
from £600 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Best price guarantee

Capacity

  • Standing
    up to 300
  • Dining
    up to 80
  • Theatre
    up to 60
  • Cabaret
    up to 60
  • Classroom
    up to 50

Catering and drinks

In-house catering available Venue can organise food and drink
Extensive vegan menu
Extensive vegetarian menu
British cuisine
No external catering allowed
Venue provides alcohol Venue can supply alcoholic beverages
No BYO alcohol allowed

Facilities

  • Wi-Fi available
  • Projector
  • Flatscreen TV
  • Whiteboard
  • Flipchart
  • PA system / speakers Venue provides a sound system for music and announcements
  • Quiet space
  • Paid parking facilities available nearby
  • Unavailable: Conference call facilities
  • Unavailable: Air conditioner
  • Unavailable: Natural light
  • Unavailable: Storage space
  • Unavailable: Accommodation is available on-site

Music & sound equipment

  • Play your own music Venue allows playing your own music
  • Bring your own DJ Venue allows bringing your own DJ instead
  • No noise restrictions

Accessibility

  • Unavailable: Accessible toilets
  • Unavailable: Ground level
  • Unavailable: Accessible parking spot available
  • Unavailable: Lift to all floors
  • Unavailable: Cargo lift
  • Unavailable: Wheelchair accessible

Rules of the space

Allowed events

  • Promoted and ticketed events Events that you’re promoting or selling tickets for
  • Temporary Event Notices (TENs) available
  • No wedding licence

Age policy

Guests under 18 are not allowed after 17:00

Host rules

-No smoking inside the building
-BYO bottle alcohol not allowed
-Unfortunately, the venue does not accept funerals or wakes
-Any damage to, or theft of, property at the Host Venue (including, but not limited to, music equipment, furniture, fixtures and fittings, and any other property of the Host Venue) caused during the event times on the event date is your responsibility and will be charged to you at full replacement cost
-No 18th Birthday Parties

Cancellation policy: Standard 30 day

Show cancellation details

Reviews and ratings

(2 reviews and ratings - )

Verified reviews come from Tagvenue users. All reviews are checked by our team to uphold our trust and safety standards.

DG
DAMIAN G.
Verified review
Live Music · 100 guests · August 2026

What I liked about the place we rented was the great location, fantastic atmosphere, and friendly staff.

What I didn’t like was that the venue we rented did absolutely no promotion for the event. We left two posters that were supposed to be displayed at the entrance, informing people that the event was taking place on a specific date. Another issue was that we couldn’t enter the venue earlier than the scheduled time. It’s important to remember that the artists and performers also need time to do a soundcheck, test the equipment and make sure everything is working properly, especially since not everything was as it had been agreed or advertised.

5.0
DG
DAMIAN G.
Verified review
Excellent communication

Overall, I was very happy with the event. Despite a few minor inconveniences and things that could have been better organised, the event was a success and everything came together in the end. The location was great, the atmosphere was fantastic, and the staff were friendly and helpful. We really enjoyed being there and were pleased with how the event turned out. I hope we can come back next year and make it even bigger and better. We would definitely be happy to return!

5.0

About O'Neill's St Mary Street Cardiff

O'Neill's St Mary Street Cardiff is a Trusted Tagvenue Partner, validated by the Tagvenue team with a record of successful bookings on the platform.

Location

Location map

Meet your host

Prabs Ragbotra
Member of Tagvenue since February 2025
2 Reviews
5 Rating
2h Response time
99% Response rate

Contact venue managers directly on Tagvenue. Keep all event communication on the platform for a secure, seamless booking.

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