Nordic Urban Unveils Swim Sauna Complex Plans for Cardiff Bay 2026

Key Points

• Waterfront developer Nordic Urban has submitted detailed planning documents for a £17 million outdoor heated swimming pool and wellness complex at the Grade II-listed Mount Stuart Graving Docks.
• The proposed 12,400-square-metre development features a 25-metre outdoor heated main pool, hot and cold plunge pools, four saunas, changing and relaxation facilities, a rain garden, a public café, a restaurant, and elevated water-view terraces.
• Modelled on the successful Allas Pool project in Helsinki, Finland, which attracts 800,000 visitors annually, the site will combine a “premium wellness offering” with “open-access public swimming”.
• The project promises all-year-round operation to drive continuous footfall to Atlantic Wharf and Mermaid Quay during off-peak winter months.
• The development is set to create multiple local employment opportunities, spanning lifeguards, swim instructors, engineering staff, facilities management, and front-of-house hospitality positions.
• The scheme is currently undergoing public consultation before Cardiff Council considers the final planning determination.

Cardiff Bay (Cardiff Daily) November 3, 2026 — Newly submitted planning documents have revealed comprehensive design and operational details for a £17 million outdoor heated swimming pool, sauna, and cultural complex proposed for the historic Mount Stuart Graving Docks in Cardiff Bay. Designed to convert under-utilised historic dry docks into an all-weather destination, the 12,400-square-metre site will feature open-access swimming, wellness services, and dining facilities intended to support economic regeneration and boost public health across the local community

What Are the Key Architectural and Leisure Features of the Proposed Complex?

As reported by Kieran Molloy, Local Democracy Reporter for WalesOnline and Nation.Cymru, newly released planning documentation sets out a transformation of the Grade II-listed Mount Stuart Graving Docks No. 1 and No. 2 into a 12,400-square-metre year-round outdoor swimming, wellness, and cultural destination.

The central element of the architectural footprint, designed in partnership with lead concept architect OOPEAA (Office for Peripheral Architecture), is a 25-metre outdoor heated main swimming pool. This will be surrounded by complementary aquatic and thermal amenities, including dedicated hot and cold pools, four distinct sauna units, comprehensive changing facilities, indoor relaxation rooms, and a rain garden integrated into the layout.

To support visitor activity outside of thermal bathing, the complex design incorporates a public café, a full-service restaurant, and open-air wooden terraces built directly over the dock basins to provide unobstructed views across Cardiff Bay.

As detailed by Tom Lowe of Building Design, the structural framework relies heavily on modular Cross-Laminated Timber (CLT) elements engineered to float within the historic dry docks, reducing environmental disruption and allowing elements to be navigated via local waterways during construction.

How Does the Development Balance Public Accessibility with Commercial Sustainability?

As quoted directly from the planning application submitted by Nordic Urban and cited by Kieran Molloy of WalesOnline, the development is

“rooted in Nordic values of inclusion and social connection”

and aims to establish

“a modern outdoor bathing culture in the heart of the city”.

Addressing the operational structure, the developer confirmed in official filings that the site will operate a dual-purpose commercial framework. The venue is designed to balance a “premium wellness offering” with “open-access public swimming”.

As outlined in the official submission:

“The scheme ensures that local residents across all income brackets can access high-quality exercise and relaxation facilities in a unique urban setting. This combination transforms the site into a major social and economic engine, delivering clear public health benefits while reinforcing Cardiff Bay’s status as a world-class waterfront.”

The operational model mirrors the developer’s primary benchmark site, the Allas Sea Pool in Helsinki, Finland, according to data verified by Nordic Urban and published by Nation. Cymru, the Helsinki prototype opened in 2016 and currently attracts approximately 800,000 visitors annually, proving the viability of year-round heated outdoor bathing in Northern European climates.

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What Impact Will the Project Have on Local Employment and the Winter Economy?

As reported by Helen Andrews in Health Club Management, the project forms a core component of Cardiff Council’s strategic push to extend visitor retention and spend around Atlantic Wharf.

The application highlights that the facility will generate direct, permanent employment across several sectors in the Cardiff Bay area. Jobs created by the venue will include:

• Certified lifeguards and professional swim instructors
• Front-of-house reception and administrative staff
• Maintenance engineers and specialized facility operation managers
• Kitchen brigade members, including head and line chefs
• Front-of-house hospitality personnel for the restaurant and café

Beyond direct on-site staffing, the planning submission emphasizes the facility’s role as a seasonal economic stabilizer for surrounding businesses.

As stated in the planning submission text reported by Nation.Cymru:

“By introducing year-round heated open-air pools and saunas, the development creates a resilient, weather-proof attraction. This will encourage steady, continuous footfall to the Atlantic Wharf area during the winter months, providing consistent economic support to neighbouring businesses, restaurants, and hotels in Mermaid Quay.”

The proposal is currently in its formal public consultation window, during which local residents, business owners, and environmental stakeholders can submit comments before Cardiff Council’s planning committee renders a final decision.

Background of Mount Stuart Graving Docks and Atlantic Wharf Regeneration

The Mount Stuart Graving Docks represent a key element of South Wales’ maritime industrial heritage. Constructed during the late 19th century—with Dock No. 1 completed in 1879 and Dock No. 2 built shortly thereafter—the dry docks served as vital repair facilities for commercial coal ships, cargo vessels, and steamships navigating the busy trade routes of the Bristol Channel.

Following the post-war decline of heavy shipping and coal exports from South Wales, commercial dock operations ceased, leaving the stone-walled graving basins disused for several decades. Recognized for their historical importance, the docks were granted Grade II-listed status to protect their structural fabric, masonry walls, and historic footprint from demolition or insensitive modification.

Despite the wide-scale regeneration of Cardiff Bay throughout the 1990s and early 2000s—which saw the construction of the Senedd building, the Wales Millennium Centre, and the commercial dining quarter at Mermaid Quay—the graving docks themselves remained largely under-utilised and fenced off from direct public interaction.

Nordic Urban reached an agreement with Cardiff Council for a long-term site lease contingent upon full planning consent. The proposed Allas Pool facility forms a central pillar of the wider Atlantic Wharf Masterplan, a multi-million-pound urban renewal effort that includes a new 15,000-capacity indoor arena, extended public transport links via the Cardiff Crossrail tram system, and new residential and commercial zones designed to reconnect the historic docks with modern urban life.

Prediction: How This Development Will Affect Key Stakeholders

1. Local Residents and Urban Swimmers

The introduction of a weather-proof, year-round outdoor pool will alter local leisure options. Currently, outdoor swimmers in South Wales rely heavily on open-water sea sites or seasonal outdoor lidos. A dedicated, heated 25-metre basin in Cardiff Bay provides an accessible environment for fitness, water safety training, and cold-water immersion, supported by saunas. By structuring the pricing model to include subsidized or open-access swimming alongside commercial wellness services, the site should prevent socio-economic exclusion, offering local communities high-grade physical and mental health infrastructure.

2. Merchants, Hotels, and Hospitality in Mermaid Quay

Commercial entities around Mermaid Quay and Atlantic Wharf frequently face drop-offs in customer footfall during the cold, wet winter months. Traditional outdoor waterfront attractions experience severe seasonal variance. Because Nordic sauna culture relies on cold weather to create contrast for thermal bathing, the complex is projected to generate steady, year-round footfall. Surrounding restaurants, retail units, and hotels will likely see increased evening and weekend patronage during off-peak trade periods, smoothing out annual revenue curves.

3. Heritage Organisations and Urban Planners

For heritage and architectural groups, the development presents a template for re-energizing redundant industrial water infrastructure without compromising historical integrity. Rather than infilling or permanently altering the historic masonry of the Grade II-listed graving docks, floating modular CLT structures preserve the water-filled basins while adding contemporary utility. If successful, the Cardiff scheme could serve as a case study for urban planners across Britain seeking to adapt former industrial port infrastructure into sustainable public wellness assets.