The Bow Calgary, Tower Canada, Architect, Canadian Skyscraper, Design, Project

The Bow, Tower : Calgary Architecture

EnCana and Cenovus Headquarters design by Foster + Partners Architects

The Bow, EnCana and Cenovus Headquarters

The Bow Tower in Calgary

The Bow Tower Calgary skyscraper
photo : Nigel Young_Foster + Partners

7 Jun 2013

The Bow Tower Calgary Building Information


The building’s form deflects the prevailing winds, allowing for a lighter structure

The solar heat collected in the atrium is redistributed throughout the year by means of extraction during winter and heat exchange during summer, reducing the load on the mechanical systems

3 x 6 storey-high “Sky gardens” with natural vegetation at levels 24, 42 and 54

Large glazed areas reduce the need for artificial lighting
Heat redistribution system

Displacement ventilation via a raised floor

Title: The Bow, EnCana and Cenovus Headquarters
Location: Calgary, Canada
Dates: 2005-13
Client: H+R Real Estate Investment Trust
Appointment: 2005
Construction Start: 2007
Completion: 2013
Site Area: 17,500m² / 188,300ft²
Area (gross external): 199,781m² / 2,149,644ft²
Typical Floor Area (net): 3,584m² / 38,564ft²
Height: 236m / 774.3ft
Number of Floors: 58
Structure: Steel-braced moment frame with a diagrid
Capacity: 4000
Facilities: Offices Public plaza ; Retail facilities
Parking facilities: 1360 car spaces
Materials: 39,000 tonnes of steel was used ; 900,000ft² of glass was used

The Bow Calgary

The Bow Calgary
photo : Nigel Young_Foster + Partners

The Bow in Calgary – Facts


The Bow will be the tallest building in Canada outside of Toronto and the third tallest in Canada overall

It is Canada’s largest steel-framed building

It has the largest floor area of any single office building designed by Foster + Partners

The raft slab for the foundation was the largest single concrete pour in Canadian construction history, using 94 concrete trucks and taking 39.5 hours

The foundations are 3m thick and contain 14,000m3 of concrete

The intersecting triangular sections of the south atrium wall form the largest diagrid of Architecturally Exposed Structural Steel (AESS) in the world

400,000m3 of land was excavated

Approximately 1 floor was built each week

There are 40 elevators, including an express elevator serving Ground to Skygarden


2011: Canadian Institute of Steel Contractors, Alberta Steel Design Award of Excellence
2011: Canadian Institute of Steel construction, Ontario Awards, Award of Excellence
2011: Alberta Chapter American Concrete Institute, Award of Excellence
2012: Canadian Institute of Steel Construction, National Award

The Bow Calgary
photo : Nigel Young_Foster + Partners


Client: H+R Real Estate Investment Trust
Tenant: Encana and Cenovus
Developer: Matthews Southwest Developments
Architect: Foster + Partners
Foster + Partners Design Team: Norman Foster, David Nelson, Spencer de Grey, Nigel Dancey, James Barnes

Julia Vidal Alvarez, Laura Alvey, Tim Bauerfeind, Jakob Beer, Karin Bergmann, Mattias Bertelmann, Stephen Best, Federico Bixio, Marie Christoffersen, Vasco Correia, Kirsten Davis, Ulrich Hamman, Michelle Johnson, Arjun Kaicker, Sabine Kellerhoff, Chiu-Ming Benny Lee, Mathieu Le Sueur, Shirley Shee Ying Leung, Alissa MacInnes, Carsten Mundle, Florian Oelschlager, Cristina Perez, Susanne Reiher, Diana Schaffrannek, Anja Schuppan, Carolin Senfleben, Robert Smith, Eva Tzivanki

The Bow Calgary
drawing : Foster + Partners

Collaborating Architect: Zeidler Partnership
Structural Engineer: Yolles
Civil Engineer: Kellam Berg

Mechanical Engineers: Cosentini
Main contractor: Ledcor Construction
Fire Consultant: Leber Rubes
Vertical Transport Consultant: KJA
Acoustic Consultant: Cerami
Cost Consultant: Altus Helier
Lighting Consultant: Claude Engle Lighting Design
Landscape Consultant: Carson McCulloch
Planning Consultant: Sturgess Architecture
Environmental Consultant: Transolar
Wind Engineer: RWDI
Transportation Engineer: DA Watt
Signage Consultant: Cygnus
Code Consultants: Leber-Rubes
Art Consultant: Via Partnership
Artist: Jaume Plensa
Cladding: Brook Van Dalen

The Bow Calgary images / information from Foster + Partners

The Bow Tower Calgary

Alberta, Canada
Design: Foster + Partners with Zeidler Partnership

The new EnCana headquarters building, The Bow, will be the first significant mixed-use development east of Centre Street in downtown Calgary. Providing an environmentally sustainable headquarters for one of Canada’s leading corporations, the design will create a generous social space for Calgary, offering a new cultural, civic and shopping destination.

Co-architects: Zeidler Partnership

The Bow Calgary The Bow Calgary The Bow Calgary
image from architects office

The Bow Tower architects : Foster + Partners

The Bow Calgary images / information from Foster + Partners

Location: Sixth Avenue, The Bow Calgary, Alberta, Canada, North America

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