Trusted by over 1M+ customers
Top 21st Birthday Party Venues in Cardiff
Turning 21 is a milestone, so whether you’re planning a grand celebration with hundreds or a laid-back dinner with a few lucky friends, we’ve got you covered. Head to indie hangouts on Kelham Island for a fun night or cosy cocktail bars on West Street for a birthday happy hour. For a big birthday bash, explore the party halls in the city centre, or choose sunny rooftop terraces and beer gardens on Ecclesall Road for a summer celebration. These venues will guarantee you have a blast on your special day! Browse, compare, and shortlist the best 21st birthday venues in Cardiff. Once you find the perfect spot, seal the deal and get ready to party!
-
![PARTY AND EVENT VENUE at DNC BAR in Cardiff Centre]()
from £100
hire fee / per sessionCheck availabilityPARTY AND EVENT VENUE
120 guestsDNC BARCardiff Centre
#Supervenue
BBella H.
“The venue was a great size, places to sit down, could connect to the speaker” -
![Viewing Deck at Lo Lounge in Cardiff]()
from £125
hire fee / per afternoonCheck availabilityViewing Deck
120 guestsLo LoungeCardiffLLisa K.
“They would hard all night. Location was great over looking the bay. Would highly recommend booking this venue.” -
![Rockpools Dining Area at The Botanist Cardiff Bay in Cardiff]()
from £800
minimum spend / per sessionCheck availabilityRockpools Dining Area
30 guestsThe Botanist Cardiff BayCardiffHHelena K.
“28 of us celebrated a special birthday at the rock pool area. Food and drinks were lovely.” -
![Birthday Party at Cardiff City Stadium in Cardiff Outskirts]()
from £235
hire fee / per sessionCheck availabilityBirthday Party
100 guestsCardiff City StadiumCardiff OutskirtsAAlun J.
“Splendid venue and excellent support from the duty staff and the events planner.” -
![Private Upstairs Room at O'Neill's Trinity Street Cardiff in Cardiff Centre]()
from £200
minimum spend / per sessionCheck availabilityPrivate Upstairs Room
100 guestsO'Neill's Trinity Street CardiffCardiff Centre
#Supervenue
DDaniel H.
“Venue was great size, bar staff were brilliant” -
![Bar 4 at Bonnie Rogues Pub in Cardiff Centre]()
from £250
minimum spend / per sessionCheck availabilityBar 4
250 guestsBonnie Rogues PubCardiff Centre
#Supervenue
AAngela D.
“The area was perfect for our event. Easy access to the bar.” -
![Upper Level at Be At One Cardiff in Cardiff Centre]()
from £250
minimum spend / per sessionCheck availabilityUpper Level
100 guestsBe At One CardiffCardiff CentreAt Be At One Cardiff, our Upper Level offers the perfect space for your next private event. Whether you’re hosting a corporate function, a birthday celebration, or a festive Christmas party, this exclusive area provides a -
![Moonshine Bar at Bootlegger Bar Cardiff in Cardiff Centre]()
from £550
minimum spend / per sessionCheck availabilityMoonshine Bar
50 guestsBootlegger Bar CardiffCardiff CentreRRhydian W.
“The customer service was fantastic, and its a great space with a great vibe to have a drink with friends.” -
![Upstairs Room at O'Neill's St Mary Street Cardiff in Cardiff Centre]()
from £400
minimum spend / per sessionCheck availabilityUpstairs Room
300 guestsO'Neill's St Mary Street CardiffCardiff CentreDDamian G.
“What I liked about the place we rented was the great location, fantastic atmosphere, and friendly staff.” -
![Bar 3 at Bonnie Rogues Pub in Cardiff Centre]()
from £250
minimum spend / per sessionCheck availabilityBar 3
120 guestsBonnie Rogues PubCardiff Centre
#Supervenue
MMartina F.
“Excellent space! In the mix so we still benefitted from the atmosphere of the bar, and easy access to drinks.” -
![Entire Venue at Cambrian Tap in Cardiff Centre]()
from £6
per person / per sessionCheck availabilityEntire Venue
140 guestsCambrian TapCardiff CentreThe pub can accommodate up to 88 seated guests for birthdays, drinks celebrations, sport screenings and other parties. The space features a large bar, comfortable lounge-like seating, karaoke equipment, TV screens and Wi-Fi. -
![Conservatory (2nd Floor) Bar at The Botanist Cardiff Central in Cardiff Centre]()
from £1000
minimum spend / per sessionCheck availabilityConservatory (2nd Floor) Bar
90 guestsThe Botanist Cardiff CentralCardiff Centre
#Supervenue
WWendy
“The atmosphere very good and topped with beautiful weather. The manager on the night was helpful and friendly.”
- 1
- 2
- 3
- ...
- 5
Popular filters
Capacity
Budget
Area type
Venue type
Catering and drinks
Accessibility features
FAQs about Top 21st Birthday Party Venues in Cardiff
Booking costs of 21st birthday venues average £500 minimum spend per event. Costs vary depending on guest capacity, popularity, location, and amenities like sound systems or bar services. Extra charges may apply for custom catering, decor, or event planning services. Packages with add-ons, such as DJs, photo booths, or other entertainment services, can also increase the overall cost. Check out the typical price ranges in Cardiff, based on Tagvenue data:
| From £300 | to £1500 | minimum spend per event |
| From £12 | to £34 | per person |
| From £125 | to £250 | hire fee per event |
Based on the popularity and user ratings on Tagvenue (updated September 2026), the best options include:
-
Viewing Deck at Lo Lounge in Cardiff - rated 5/5
Our user said: ‘Location was great over looking the bay. Would highly recommend booking this venue.’ -
Birthday Party at Cardiff City Stadium in Cardiff Outskirts - rated 5/5
Our user said: ‘Thank you for making it such a special occasion.’ -
PARTY AND EVENT VENUE at DNC BAR in Cardiff Centre - rated 4.8/5
Our user said: ‘Staff were fantastic, venue is perfect for an 18th party.’
You'll find 21st birthday venues in various sizes, from smaller spots to larger venues; keep in mind that the type of space and your chosen layout will affect the capacity! Below you can see the typical venue sizes in Cardiff, together with the standard prices in each size range, based on Tagvenue data (September 2026):
| Small | up to 50 guests | prices average £600 minimum spend per event |
| Medium | between 65 and 100 guests | prices average £300 minimum spend per event |
| Large | over 140 guests | prices average £1000 minimum spend per event |
These are the venues within 0.1 mi from central Cardiff, available to book on Tagvenue:
-
Upstairs Room at O'Neill's St Mary Street Cardiff
on 85-87 St Mary St, Cardiff - 0.1 mi from centre.
Our user said: ‘What I liked about the place we rented was the great location, fantastic atmosphere, and friendly staff.’ -
The Gallery (Upstairs) at The Cocktail Club Cardiff
on 75 Saint Mary Street - 0.1 mi from centre.
Venue said: The top floor bar ‘The Gallery’ – the hottest spot in Cardiff to throw your next serious soiree in. -
Entire Venue at Cambrian Tap
on 51 Saint Mary Street - 0.1 mi from centre.
Venue said: The Cambrian Tap is a bar and pub located in the Brewery Quarter in Cardiff, UK. Tables or our entire venue can be booked for small and medium-sized private events such as parties and celebrations, up to 88 people.
Based on Tagvenue data (as of September 2026), users looking for 21st birthday venues most commonly go for these venue types:
| Bar | prices average £500 minimum spend per event | typically between 100 and 280 guests |
| Restaurant | prices average £800 minimum spend per event | typically between 60 and 90 guests |
| Event Space | prices average £550 minimum spend per event | typically between 50 and 110 guests |
| Pub | prices average £500 minimum spend per event | typically between 70 and 140 guests |
| Cocktail Bar | prices average £150 hire fee per event | typically between 70 and 100 guests |
Smaller 21st birthday venues usually fit up to 50 guests standing. Here are some great options in Cardiff, based on Tagvenue data as of September 2026:
-
Cabin 1 at Lo Lounge, rated 5/5 - event space for 45 guests
Venue said: Lo Lounge’s private shipping containers offer a stylish and versatile space for events, meetings, or celebrations. Each container seats up to 45 guests and includes heating, cozy blankets, and a mini fridge stocked with drinks. -
Downstairs Section at O'Neill's Trinity Street Cardiff, rated 5/5 - function room for 40 guests
Our user said: ‘Our bartenders were so so lovely and accomodating, and we were able to run our evening exactly as we wanted.’ -
The Greenhouse at The Botanist Cardiff Central, rated 4.6/5 - dining room for 30 guests
Our user said: ‘Great little space, set off from the main restaurant.’
Consider capacity, location, and atmosphere when selecting a venue for your 21st birthday party. Think about whether you want a lively party or something more private. For a comprehensive guide on choosing the right venue, check out our How to Choose a Venue guide, which covers everything from budget to amenities.
Venue booking prices normally include the use of the space for your event, basic furniture (like tables and chairs), and sometimes access to AV equipment. Additional services, such as catering or decoration, may incur extra costs, so it's essential to clarify what's included in the price with the venue manager when booking your venue.
People also search for
21st Birthday Venues in other cities
Page last updated in September 2026
To provide you with relevant information, our pages are refreshed using an algorithm that aggregates real-time data, including bookings, reviews, and venue updates.