Ottawa’s Westboro Beach Pavilion: A heritage landmark reimagined as a net-zero community hub

Project overview 

• Location: Westboro Beach, Ottawa, Ontario
• Building type: Public beach pavilion (heritage structure)
• Client: Public sector (National Capital Region)
• Mandate: Mechanical and electrical engineering
• Executed by: GWAL, a division of Englobe
• Key features: Fully electric design; net‑zero operation; high‑efficiency ventilation; solar power
• Sustainability highlights: No natural gas; heat pump systems; regenerative ventilation (>95% efficiency); 10 kW rooftop solar array 

Revitalizing a much-loved destination  

Set along the shoreline of the historic Ottawa River, Westboro Beach has long been a valued destination for residents and visitors seeking access to nature in the heart of the city. Recent revitalization efforts have reinforced its role as a year‑round public space, enhancing access to the waterfront while preserving the character of one of the National Capital Region’s most popular natural environments. 

At the centre of this transformation stands the Westboro Beach Pavilion, a Recognized Federal Heritage Building celebrated for its architectural significance and close relationship with the surrounding landscape. Originally constructed as part of mid‑twentieth‑century federal initiatives to reshape Ottawa’s riverfront, the pavilion has now been thoughtfully reimagined to meet contemporary sustainability objectives without compromising its historic integrity.  

An iconic design rooted in landscape and history 

Architecturally, the Westboro Beach Pavilion is defined by three hexagonal concrete towers, distinguished by understated detailing and tripartite pitched roofs. Rising from a concrete substructure that blends into the terrain, the building is capped with a grass‑covered roof that allows it to merge seamlessly into the surrounding parkland.  

The Westboro Beach pavilion’s origins are closely tied to the development of the Ottawa River Parkway and broader federal efforts to convert an industrial shoreline into interconnected cultural landscapes. Led over several decades by organizations including the National Capital Commission and its predecessor agencies, these initiatives reshaped the river corridor into a sequence of parkways, beaches and gathering spaces accessible to the public.  

Westboro Beach emerged as one of the largest and most prominent examples of this shift, marking the transition from privately held waterfront to a welcoming civic space.  

A sustainability‑driven refurbishment project 

As part of the Westboro Beach renewal, the team from GWAL, a division of Englobe, delivered a comprehensive mechanical and electrical (M&E) design centred on sustainability, electrification and long‑term operational efficiency.  

The result is a fully electric, net-zero facility with no reliance on natural gas, demonstrating how historic public buildings can play an active role in Canada's low-carbon future. 

Advanced, high-performance systems  

A cornerstone of the system is a dual‑core regenerative ventilation unit that transfers energy between exhaust air and incoming fresh air at more than 95% efficiency. This advanced technology eliminates the need for defrost controls during winter operation, significantly reducing energy losses while maintaining indoor comfort throughout the year.  

Heating and cooling are provided by high‑performance heat pump technology, selected for its ability to operate solely on electricity while delivering a high coefficient of performance across the heating season. To ensure resilience during periods of extreme cold, the system is supplemented by an electric backup heating coil, providing redundancy without compromising the pavilion’s emissions profile.  

All‑electric systems for a clean energy future 

In keeping with the project’s sustainability goals, the Westboro Beach pavilion’s domestic hot water system relies entirely on electric heat pump water heaters, further reducing onsite emissions. In addition, the kitchen facilities were likewise designed to function fully on electricity, supporting modern operations while aligning with broader municipal electrification objectives.  

Onsite renewable energy generation is provided by a 10‑kilowatt solar photovoltaic array installed on the roof, contributing clean electricity to daily operations and reinforcing the building’s net-zero ambition.  

To support the upgraded infrastructure, new Hydro and Bell services were installed beneath the Kichi Zibi Mikan (formerly Sir John A. Macdonald) Parkway, ensuring reliable connectivity while minimizing impacts on the surrounding landscape. 

Designing for seasonal operation and climate resilience 

The GWAL team faced a unique operational consideration: the site’s exclusively seasonal use.  

With one of the two pavilion buildings closed during the winter months, the GWAL team specified M&E equipment capable of either operating reliably in sub‑freezing conditions, or being fully winterized as required. This flexible approach ensures long‑term durability while optimizing performance across changing seasonal demands.  

Connecting Ottawa’s past with a sustainable future 

By carefully integrating modern building systems within a protected heritage structure, the project demonstrates how climate resilience, operational efficiency and architectural conservation can coexist within a single, cohesive design strategy.  

In pairing iconic mid‑century architecture with high‑performance mechanical and electrical systems, the GWAL project team helped support Ottawa’s climate goals while preserving a cherished public landmark for future generations.  

Today, the revitalized Pavilion stands as a tangible expression of sustainable redevelopment in a heritage context. The pavilion’s renewed presence along the riverfront reinforces Westboro Beach’s role as a gathering place that honours the past, serves present community needs, and contributes meaningfully to a greener and more accessible urban future.