A function room in a pub with patterned carpet, wooden tables, warm lighting, and TVs at O'Neill's Trinity Street Cardiff.
A pub function room with long wooden tables, bench seating, TV screens, and exposed bulb lighting at O'Neill's Trinity Street Cardiff.
A function room with round wooden tables, patterned carpet, and wall-mounted TV at O'Neill's Trinity Street Cardiff.
A function room with hanging Edison bulbs, wooden tables, and patterned flooring at O'Neill's Trinity Street Cardiff.

Private Upstairs Room at O'Neill's Trinity Street Cardiff

Function Room in a Pub
·
Private space
20-21 Trinity Street, Cardiff, CF10 1BH –
Cardiff Centre
Up to 40
seats
Up to 100
standing
Venue offers catering
External catering not allowed

About this space

The Private Upstairs Room is a Function Room in O'Neill's Trinity Street Cardiff and has a compact, bar-centred layout that creates a private space above the main pub.

Design: The room has exposed brick and dark wood panelling, a low coffered ceiling and warm pendant lighting that keep sightlines short and the layout intimate.

Features: The room includes a PA system and speakers, and it allows hosts to play their own music or bring an external DJ; a cleared area functions as a small dance floor. The room also provides Wi‑Fi, air conditioning and natural daylight.

Ideal for: Groups seeking a lively, informal setting for standing receptions or relaxed seated gatherings where music and mingling are central.

What guests say: The space has a mix of high and low tables and a straightforward, unpretentious decor. The space maintains background music at a volume that still allows conversation.

Offers and packages

Menus

 Drinks menu
Drinks menu
Christmas menu
Christmas menu

Prices

Monday
11:00 – 23:00
from £200 min. spend
Per session
11:00 – 23:00
from £200 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Tuesday
11:00 – 23:00
from £200 min. spend
Per session
11:00 – 23:00
from £200 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Wednesday
11:00 – 23:00
from £200 min. spend
Per session
11:00 – 23:00
from £200 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Thursday
11:00 – 23:00
from £200 min. spend
Per session
11:00 – 23:00
from £200 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Friday
9:00 – 0:00
from £200–£500 min. spend
Per session
9:00 – 17:00
from £200 min. spend
Per session
17:00 – 0:00
from £500 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Saturday
9:00 – 0:00
from £500 min. spend
Per session
9:00 – 17:00
from £500 min. spend
Per session
17:00 – 0:00
from £500 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Sunday
11:00 – 22:00
from £200 min. spend
Per session
11:00 – 22:00
from £200 min. spend
Alcohol licence until 2:00. Extension available. All prices include VAT.
Best price guarantee
Pricing updated by venue 3 months ago
Pricing rated as accurate by 1 verified user

Capacity

Standing
up to 100
Dining
up to 40
Theatre
up to 30
Boardroom
up to 30
U-Shaped
up to 30
Classroom
up to 30

Catering and drinks

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

Facilities

Wi-Fi available
Flatscreen TV
Flipchart
PA system / speakers Venue provides a sound system for music and announcements
Conference call facilities Equipment for video or phone conferencing during your event
Air conditioner
Natural light Room has windows or a skylight, so daylight comes in
Quiet space
Dance floor Dedicated dance floor area
Paid parking facilities available nearby
Unavailable: Projector
Unavailable: Whiteboard
Unavailable: Photo equipment
Unavailable: Video equipment
Unavailable: Lighting equipment
Unavailable: Greenscreen
Unavailable: Backdrops
Unavailable: Storage space
Unavailable: Soundproof
Unavailable: Mirrors
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

No promoted and ticketed events allowed
Temporary event notices available
No wedding licence

Age policy

Guests under 18 are not allowed after 20:00

Host rules

-No smoking in the building
-No external catering allowed
-No BYOB
-Under 18's allowed in the venue until 8pm

Cancellation policy: Standard 30 day

Show cancellation details

Reviews and ratings

(9 reviews and ratings - )

Verified reviews come from Tagvenue users. All reviews are checked by our team to uphold our trust and safety standards.
VW
Verity W.
Verified review
Bar · 50 guests · May 2026
We had a FANTASTIC evening here. From start to finish everything went smoothly. The Gold buffet package was outstanding, the food was gorgeous. Our bartenders were so so lovely and accomodating, and we were able to run our evening exactly as we wanted. We have since uploaded photos onto our social media, and it looked so amazing that another society messaged to ask where we had it etc as it looked so good! All-in-all would highly recommend this venue, the communication prior was very good, and the whole evening went exactly as hoped.
nothing!
5.0
CD
Christopher D.
Verified review
Pub · 60 guests · September 2025
Great size venue for our party and brilliant location. The staff were fantastic, great food and attentive to what we needed
5.0
KC
Katherine C.
Verified review
Event Space · 40 guests · August 2025
Everything
Nothing
5.0
DH
Daniel H.
Verified review
Pub · 30 guests · May 2025
Venue was great size, bar staff were brilliant
4.8

O'Neill's Trinity Street Cardiff is a #Supervenue

#Supervenue program is based on our customers' feedback and highlights venues that are most dedicated to providing outstanding hospitality, customer service and event experience. Read more
Customers rated communication with this venue and their event experience as Superb
Response time: within couple of hours
Response rate: 93%

About O'Neill's Trinity Street Cardiff

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

Other spaces and event packages at this venue

Downstairs Section at
from £5
per person / per session
Function Room in a Pub
Semi-private area
20
40
Downstairs Section

Location

Location map

Meet your host

Prabs Ragbotra
Member of Tagvenue since February 2025
9 Reviews
5 Rating
2h Response time
100% Response rate

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

UK > Cardiff > O'Neill's Trinity Street Cardiff > Private Upstairs Room

Similar spaces

1Below
from £150
hire fee / per session
Lounge in a Cocktail Bar
Private space
38
80
Mocka Lounge
(1)
Cardiff Centre
Conservatory (2nd Floor) Bar
from £1000
minimum spend / per session
Conservatory in a Restaurant
Semi-private area
40
90
The Botanist Cardiff Central
(14)
Cardiff Centre
Super Venue Badge #Supervenue
Second Floor- Private Room
from £300
minimum spend / per session
Bar in a Cocktail Bar
Private space
50
100
Tonight Josephine Cardiff
(1)
Cardiff Centre
PARTY AND EVENT VENUE
from £100
hire fee / per session
Cocktail Bar
Whole venue
60
120
DNC BAR
(31)
Cardiff Centre
Super Venue Badge #Supervenue
Downstairs
from £10
per person / per session
Event Space in a Bar
Private space
45
72
Prego Wine Bar
Cardiff Centre
Bar 3
from £250
minimum spend / per session
Bar in a Pub
Semi-private area
50
120
Bonnie Rogues Pub
(11)
Cardiff Centre
Super Venue Badge #Supervenue
The Gallery (Upstairs)
from £300
minimum spend / per session
Bar in a Cocktail Bar
Private space
20
70
The Cocktail Club Cardiff
(1)
Cardiff Centre
Entire Venue
from £30
per person / per session
Restaurant
Whole venue
50
60
Vivo Latino
Cardiff Outskirts
Viewing Deck
from £125
hire fee / per afternoon
Event Space in a Bar
Private space
65
120
Lo Lounge
(14)
Butetown, Cardiff
The Green Room
from £500
minimum spend / per evening
Bar in a Live Music Venue
Private space
20
70
The Piano Works Cardiff
(1)
Cardiff Centre