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Highlights

  • 3 Assembly Square offers 7,418 SF on the 4th floor, fully furnished with 72 desks, a boardroom, and breakout space ready for occupancy.
  • Benefit from raised access floors, chilled beam air conditioning, LED lighting, showers, bike storage, concierge services, and parking.
  • Take advantage of excellent connectivity via road, rail, air, bus, and boat-bus links, supporting convenient travel across the region.
  • Experience a striking full-height glazed atrium that enhances arrival appeal, complemented by BREEAM Excellent and EPC B credentials.
  • Positioned behind the Senedd overlooking Roath Basin, the building sits among occupiers including HBOS, Ofcom, Arup, and the EU Commission.
  • Discover Cardiff Bay amenities at nearby Mermaid Quay, home to 30+ restaurants, cafés, bars, and a cinema for work-life balance.

All Available Space(1)

Display Rental Rate as

  • Space
  • Size
  • Term
  • Rental Rate
  • Space Use
  • Build-Out
  • Available
  • 4th Floor
  • 7,418 SF
  • Negotiable
  • $31.17 /SF/YR $2.60 /SF/MO $231,206 /YR $19,267 /MO
  • Office
  • -
  • Now

Fully furnished suite featuring a boardroom, breakout areas, and 72 desks in total. This suite benefits from chilled beam A/C, a raised access floor, concierge reception, 24-hour access, shower facilities, and more.

  • Use Class: B1
  • Space is in Excellent Condition
  • Reception Area
  • Closed Circuit Television Monitoring (CCTV)
  • Natural Light
  • Shower Facilities
  • Atrium
  • Spectacular views across Cardiff Bay
  • BREEAM Excellent
  • Services available for kitchen fit-out
  • 72 Workstations
  • Central Air and Heating
  • Elevator Access
  • High Ceilings
  • Bicycle Storage
  • Energy Performance Rating - B
  • DDA Compliant
  • Generous on site parking
  • Immediately available
Space Size Term Rental Rate Space Use Build-Out Available
4th Floor 7,418 SF Negotiable $31.17 /SF/YR $2.60 /SF/MO $231,206 /YR $19,267 /MO Office - Now

4th Floor

Size
7,418 SF
Term
Negotiable
Rental Rate
$31.17 /SF/YR $2.60 /SF/MO $231,206 /YR $19,267 /MO
Space Use
Office
Build-Out
-
Available
Now

4th Floor

Size 7,418 SF
Term Negotiable
Rental Rate $31.17 /SF/YR
Space Use Office
Build-Out -
Available Now

Fully furnished suite featuring a boardroom, breakout areas, and 72 desks in total. This suite benefits from chilled beam A/C, a raised access floor, concierge reception, 24-hour access, shower facilities, and more.

  • Use Class: B1
  • 72 Workstations
  • Space is in Excellent Condition
  • Central Air and Heating
  • Reception Area
  • Elevator Access
  • Closed Circuit Television Monitoring (CCTV)
  • High Ceilings
  • Natural Light
  • Bicycle Storage
  • Shower Facilities
  • Energy Performance Rating - B
  • Atrium
  • DDA Compliant
  • Spectacular views across Cardiff Bay
  • Generous on site parking
  • BREEAM Excellent
  • Immediately available
  • Services available for kitchen fit-out

Property Overview

3 Assembly Square is a premier waterfront office development in Cardiff Waterside. The available 7,418-square-foot accommodation is located on the 4th floor. It comes fully furnished with a boardroom, breakout area, and 72 desks in total. The building features a striking full-height glazed atrium, creating an impressive arrival experience and filling the reception area with natural light. Sustainability credentials include a BREEAM Excellent rating and an EPC B rating. Occupiers benefit from raised access floors, chilled beam air conditioning, LED lighting, solar shading, shower facilities, secure bike storage, concierge reception, disabled access, reception services, 24-hour security, and dedicated parking spaces. Additional sustainability features include rainwater harvesting and a sustainable waste management plan. Positioned behind the Senedd and overlooking Roath Basin, 3 Assembly Square occupies a prestigious waterside location within Cardiff's established business district, alongside major occupiers including HBOS, Ofcom, Arup, and the European Commission. The location provides excellent connectivity via road, rail, air, bus, and boat-bus services, making it an accessible and highly desirable business address. Just moments from 3 Assembly Square, Mermaid Quay offers the perfect setting to step away from the office and enjoy everything Cardiff Bay has to offer. With more than 30 restaurants, cafés, bars, and a cinema, it provides an exceptional lifestyle amenity for occupiers.

  • Atrium
  • Kitchen
  • Energy Performance Rating - B
  • Reception
  • Central Heating
  • Common Parts WC Facilities
  • Natural Light
  • Reception
  • Wi-Fi
  • Air Conditioning
  • Raised Floor System
  • Shower Facilities

Property Facts

Building Type
Office
Year Built
2009
Building Height
6 Stories
Building Size
80,776 SF
Building Class
B
Typical Floor Size
12,772 SF
Parking
70 Surface Parking Spaces
70 Covered Parking Spaces

Select Tenants

  • Abel + Imray
  • Intellectual property firm specializing in patents, trade marks, and design protection.
  • Gambit Corporate Finance
  • Corporate finance advisory firm supporting mid-market transactions and strategic deals.
  • ITV
  • UK broadcaster producing television content and operating media and digital platforms.
  • KPMG LLP
  • Provider of audit, tax, advisory, consulting, and technology services.
  • Life Sciences Hub Wales
  • Supports health and life sciences innovation across industry, academia, and care sectors.

Marketing Brochure

Nearby Amenities

Restaurants

Coffi - - 7 min walk
Bella Italia - - 6 min walk
Cosy Club - - 7 min walk
Giggling Squid - - 7 min walk
Giovanni's In The Bay Italian - 7 min walk
Côte Brasserie - - 7 min walk
Yakatori 1 Japanese $$$ 7 min walk
The Sultan - - 9 min walk
Harry Ramsden's - - 8 min walk

Retail

Well Pharmacy Drug Store 6 min walk
Co-op Supermarket 6 min walk
Fitness Quarter Fitness 6 min walk
Odeon Cinema 6 min walk
Sainsbury's Supermarket 8 min walk
Spindogs Office Supply 9 min walk

Hotels

Novotel
138 rooms
4 min drive
voco
142 rooms
4 min drive
Four Points Flex by Sheraton
95 rooms
6 min drive
Marriott
205 rooms
6 min drive
Sunday
172 rooms
6 min drive

Leasing Team

Leasing Team

Matthew Jones, Director
Matthew is a Director of the Agency Team at Fletcher Morgan having joined the Practice in 2013. He is involved in all aspects of Commercial Property and in particular retail, industrial, student/hotel, alternative sectors, logistics and distribution. Matthew is also working alongside the investment agents on disposals and acquisitions of a variety of buildings and land and is retained by many clients to seek opportunities on their behalf.
John James, Director
John trained and qualified as a Chartered Surveyor at St. Quintin in London and joined Fletcher Morgan in 1985 becoming a Director in 1988. He has experience in all aspects of Commercial Property and specialises in office, industrial, student/hotel, alternative sectors, logistics and distribution. John has worked extensively with tenants, developers and landlords and facilitated a number of land assembly projects liaising with Local Authorities and consultancy teams.
  • Listing ID: 40843690

  • Date on Market: 6/9/2026

  • Last Updated:

  • Address: 3 Britannia Quay, Cardiff CF10 4PL

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