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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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![Upper Level at Be At One Cardiff in Cardiff Centre]()
Upper Level
100 guestsBe At One CardiffCardiff CentreAt Be At One Cardiff, our Upper Level offers the perfect space for your next private event. Whether youre hosting a corporate function, a birthday celebration, or a festive Christmas party, this exclusive area provides afrom £250
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![Bar Two at Revolution Cardiff in Cardiff Centre]()
Bar Two
80 guestsRevolution CardiffCardiff CentreDDamian M.
“Great size room, helpful sales manager, good selection of food and decent quality”from £1000
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![Rockpools Dining Area at The Botanist Cardiff Bay in Cardiff]()
Rockpools Dining Area
30 guestsThe Botanist Cardiff BayCardiffWhilst the venue may be open-planned, our Rockpools section of the restaurant gives a private and intimate feel which is semi-sectioned off from the restaurant.from £33
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![The Front Bar at Dirty Martini Cardiff in Cardiff Centre]()
The Front Bar
50 guestsDirty Martini CardiffCardiff CentreThe front bar is a beautiful private space located at the front of the venue with floor to ceiling windows allowing plenty of natural light into the room.from £500
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![Second Floor Bar at The Botanist Cardiff Central in Cardiff Centre]()
Second Floor Bar
90 guestsThe Botanist Cardiff CentralCardiff CentreLocated on the top floor next to our beautiful Terrace. Full of hanging baskets and a long spacious room for all large celebrations and work parties. Perfect for the following: - Summer Corporate Parties With Bar hire, youfrom £55
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![VIP Area at Dirty Martini Cardiff in Cardiff Centre]()
VIP Area
100 guestsDirty Martini CardiffCardiff CentreFor parties of up to 300 guests, the VIP Area can be hired exclusively. This includes plenty of luxurious seating areas and a private bar.from £500
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![Full Venue Hire at Tonight Josephine Cardiff in Cardiff Centre]()
Full Venue Hire
220 guestsTonight Josephine CardiffCardiff CentreTonight Josephine Cardiff offers a unique event and party space that spans two floors, and is the first bar to sport Josephines newest look. With updated neons, daring green hues and disco balls galore its the ideal hangoutfrom £1500
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![Top Floor Private Room at Tonight Josephine Cardiff in Cardiff Centre]()
Top Floor Private Room
100 guestsTonight Josephine CardiffCardiff CentreOur top floor bar is the perfect space for a private event. With plenty of seating, space for dancing and a great neon photo op you can host the event of the season in our Top Floor Bar.from £500
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![Bar 4 at Bonnie Rogues Pub in Cardiff Centre]()
Bar 4
250 guestsBonnie Rogues PubCardiff CentreWith a total standing capacity of 250, Bar 4 offers ample space for your event, complemented by bench-style seating and a large, fully stocked private bar, including draught options.from £250
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![Bar 3 at Bonnie Rogues Pub in Cardiff Centre]()
Bar 3
120 guestsBonnie Rogues PubCardiff CentreFeaturing a private bar and a unique spiral staircase that connects directly to the main bar, you get the full atmosphere of our main area while enjoying the exclusivity of your own space.from £250
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![Treeside at Depot in Cardiff Outskirts]()
Treeside
200 guestsDepotCardiff OutskirtsTreeside is an intimate space suitable for up to 200 guests standing / 120 seated on tables and benches. It is home to 3 in-house caterers and a cocktail bar, all of which are housed inside shipping containers.from £2160
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![Whole Venue at Dirty Martini Cardiff in Cardiff Centre]()
Whole Venue
700 guestsDirty Martini CardiffCardiff CentreSitting in the heart of Cardiff's bustling city centre on St Mary's Street, Dirty Martini is the ideal venue for after-work cocktails or your next celebration!from £1000
minimum spend / per day
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FAQs about 21st Birthday Venues in Cardiff
What should I consider when choosing a birthday venue?
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.
What does the venue booking price include?
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.
What are some of the best places for a small 21st party in Cardiff?
- Dirty Martini Cardiff: A stylish cocktail bar perfect for a chic birthday soiree. It has a standing capacity of 50 and is ideal for celebrations with close friends and family.
- 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.