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Top 21st Birthday 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!
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![Rockpools Dining Area at The Botanist Cardiff Bay in Cardiff]()
from £38
per person / 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.” -
![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 -
![Night Jar at Revolution Cardiff in Cardiff Centre]()
from £250
minimum spend / per sessionCheck availabilityNight Jar
200 guestsRevolution CardiffCardiff Centre
#Supervenue
DDamian M.
“Great size room, helpful sales manager, good selection of food and decent quality” -
![Private Upstairs Room at O'Neill's Trinity Street Cardiff in Cardiff Centre]()
from £200
minimum spend / per sessionCheck availabilityPrivate Upstairs Room
70 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 CentreMMartina F.
“Excellent space! In the mix so we still benefitted from the atmosphere of the bar, and easy access to drinks.” -
![Basement Bar at BrewDog Cardiff in Cardiff Centre]()
from £2000
minimum spend / per afternoonCheck availabilityBasement Bar
40 guestsBrewDog CardiffCardiff CentreThe Basement Bar of BrewDog Cardiff has a capacity of 40 guests. It's a cozy space, with old-school games, comfortable seating, and vibes! It will be a fit for birthday parties, nights out with friends, or dining. -
![PARTY AND EVENT VENUE at DNC BAR in Cardiff Centre]()
from £200
minimum spend / per dayCheck availabilityPARTY AND EVENT VENUE
120 guestsDNC BARCardiff Centre
#Supervenue
Our upstairs space offers the perfect setting for private events in the heart of Cardiff. Designed with comfort and style in mind, it is a versatile room that can be tailored to your celebration, whether it is a birthday, -
![Cabin 1 at Lo Lounge in Cardiff]()
from £80
hire fee / per afternoonCheck availabilityCabin 1
45 guestsLo LoungeCardiff
#Supervenue
With direct access to the outdoor bar and stunning Cardiff Bay views, they’re perfect for both business and leisure. Book your private space today! -
![The Green Room at The Piano Works Cardiff in Cardiff Centre]()
from £500
minimum spend / per eveningCheck availabilityThe Green Room
50 guestsThe Piano Works CardiffCardiff CentreLocated in the heart of Cardiff, The Piano Works is not just a venue – it’s an experience. Renowned for its high-energy live music and stylish, versatile space, The Piano Works Cardiff offers a truly unique setting for corporate -
![Whole Venue at The Athenian Tree in Cardiff Outskirts]()
from £25
per person / per sessionCheck availabilityWhole Venue
64 guestsThe Athenian TreeCardiff OutskirtsThe whole restaurant can seat up to 40 patrons for an engagement party, birthday dinner, celebratory function, or other private event. The interior decor is neutral and in keeping with the general casual vibe. -
![Entire Venue at Prego Wine Bar in Cardiff Centre]()
from £400
hire fee / per sessionCheck availabilityEntire Venue
100 guestsPrego Wine BarCardiff CentreThe Entire Venue at Prego Wine Bar can host up to 100 guests. It is fit for larger parties, corporate receptions, and family gatherings. There are tables and chairs available. -
![Private Event Space at The Welsh House Cardiff in Cardiff Centre]()
from £30
per person / per sessionCheck availabilityPrivate Event Space
96 guestsThe Welsh House CardiffCardiff CentreThe space has a private bar with sound systems, table and bar service, and optional buffets on request. Features include a mezzanine and a stage for performances or presentations.
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Enjoy Cardiff's Small 21st Birthday Venues
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Book One of Cardiff's Cheap 21st Birthday Venues
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#Supervenue
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“Excellent space! In the mix so we still benefitted from the atmosphere of the bar, and easy access to drinks.”
Celebrate at Top Bars for Birthday Parties
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#Supervenue
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#Supervenue
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FAQs about Top 21st Birthday Venues in Cardiff
In Cardiff, prices of 21st birthday venues average £600 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 October 2025:
| From £375 | to £1650 | minimum spend per event |
| From £30 | to £35 | per person |
| From £225 | to £500 | hire fee per event |
Based on the popularity and user ratings on Tagvenue (updated October 2025), the best options include:
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Private Upstairs Room at O'Neill's Trinity Street Cardiff in Cardiff Centre - rated 5/5
Our user said: ‘Great size venue for our party and brilliant location.’ -
PARTY AND EVENT VENUE at DNC BAR in Cardiff Centre - rated 5/5
Venue said: With exclusive use, you will enjoy your own private bar, music system and flexible seating arrangements. The space can be arranged for mingling, dining or dancing and formal occasions. -
Cabin 1 at Lo Lounge in Cardiff - rated 5/5
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.
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 (October 2025):
| Small 21st birthday venues | up to 50 guests | prices average £85 hire fee per event |
| Medium 21st birthday venues | between 70 and 160 guests | prices average £400 hire fee per event |
| Large 21st birthday venues | over 210 guests | prices average £1500 minimum spend per event |
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.
- Bonnie Rogues Pub: This cosy and lively pub can accommodate up to 40 seated guests. It is great for late-night birthday parties and offers delicious burgers and drinks.
- Be At One Cardiff: This lively chain bar is great for small groups of 30 guests looking to enjoy a fun cocktail experience. You can add a cocktail masterclass to your b-day celebrations to make your event extra special.
