CN Tower

Lower Observation Level

The CN Tower's Lower Observation Level was completed and unveiled in January 2026, as part
of the attraction's 50th anniversary celebrations.
The refurbished area comprises 10,600 square feet, including both indoor and outdoor viewing areas, a
glass floor, stairwells, washrooms, and the SkyPod elevator lobby.

The project was designed to seamlessly extend the recently renovated Main Observation Level 3 aesthetic down to Outdoor Observation Level 2, creating a cohesive and elevated visitor experience.

This renovation marked the first major upgrade to Level 2 since the Tower opened in 1976. HH Angus provided comprehensive mechanical, electrical, lighting, and communications engineering services as part of the transformation.

Mechanical
Scope included the complete refurbishment of existing washrooms, the addition of a new fully accessible washroom, and modifications to the HVAC systems to accommodate the new slatted ceiling design and updated spatial configuration.

Electrical
Work included upgrades to electrical distribution systems and coordination of power requirements for sophisticated new audiovisual installations. LED linear lighting was integrated along the perimeter core walls, and major infrastructure upgrades were implemented to accommodate a future perimeter heated glass system.

Lighting
A new lighting design was developed throughout the space, including exterior colour-changing LED ceiling lighting at the Outdoor Observation Level. Perimeter lighting creates the Tower’s signature exterior glow, enhancing its nighttime presence. Emergency lighting systems were also upgraded as part of the project.

Communications
The project included new horizontal cabling infrastructure to support enhanced IT, AV, and security systems. Security enhancements included the deployment of new fixed and PTZ cameras to improve interior and exterior monitoring and support life safety objectives. New fibre optic cabling was installed, along with perimeter Color Kinetics lighting controls that contribute to the Tower’s distinctive exterior illumination.

SERVICES
Mechanical Engineering | Electrical Engineering | LIghting Design | Communications Design

PROJECT FEATURES
Size: 10,600 ft2 | Status: Completed January 2026 as part of the Tower's 50th Anniversary celebrations

LOCATION
Toronto, Ontario

KEY SCOPE ELEMENTS
Refurbishment of client amenities, HVAC, spatial configuration, electrical distribution system including future capacity for heated glass, new cabling infrastructure to support IT, AV, security, new lighting design throughout, perimeter lighting; exterior illumination

The visitor experience

The renovation creates a cohesive and elevated space, enhancing the new visitor activity options.

City of Toronto

Nathan Phillips Square Spirit Garden

The Spirit Garden in Nathan Phillips Square — recipient of the 2025 Canadian Wood Council Wood Design & Building Award, as well as an Award of Excellence from the Toronto Urban Design Awards — is part of the City’s revitalization of its landmark civic space at New City Hall. As part of the improvements, a new Teaching, Learning, Sharing, and Healing space was designed and constructed to recognize and honour the experience of Indian Residential School Survivors.

The project consisted of upgrades to existing surfaces with all new landscaping, including a water feature, large sculpture and public building.

HH Angus’ scope of work included mechanical and electrical engineering, security systems consulting, IMIT design, and commissioning. Specifically, the scope featured a full technical audit and inventory report to document all infrastructure and equipment impacted by the project; power supply for new landscape and other LED lighting fixtures; connection of new area drainage to existing storm systems in the parking level; mechanical and electrical services for the new 450 ft2 Teaching Lodge; and design of security systems for public spaces and the Teaching Lodge.

HH Angus also developed and prepared a commissioning plan for all mechanical and electrical equipment being installed during the project.

One of the interesting challenges of this project was working with multiple stakeholders to ensure the vision of all parties for the project was addressed.

SERVICES
Mechanical Engineering | Electrical Engineering | IMIT design | Security Design | Commissioning

PROJECT FEATURES
Heritage site | Teaching lodge | New landscaping | Surface and parking improvements | Upgraded existing exterior infrastructure

LOCATION
Toronto, Ontario

Toronto Public Library

Wychwood Branch

The Wychwood Library is one of Toronto’s oldest libraries, built in 1915/16 and listed among Toronto's designated Heritage Properties.

HH Angus provided mechanical and electrical engineering for the renovation and expansion of the Wychwood Branch of the Toronto Public Library. Following a feasibility study that identified the desired expansion was possible, the facility expanding from 6,381 ft2 to 15,000 ft2, with mechanical and electrical systems replaced throughout the facility, including new incoming electrical and communication services.

The project included interior and exterior renovations to building structure, mechanical and electrical systems and a complete redesign of the floor space. Necessary facility upgrades included replacing flooring, millwork, furniture, elevator and heating, ventilation and air condition (HVAC) systems and equipment, building systems, and building envelope repairs.

The redesign of this heritage facility created room for approximately 2000 ft2 of seniors’ program space as well as innovative space for youth, both of which were needed in the community.

SERVICES
Mechanical Engineering | Electrical Engineering | Lighting Design

PROJECT FEATURES
Heritage building | Green roof on expansion | Completed 2022

LOCATION
Toronto, Ontario

KEY SCOPE ELEMENTS
Interior and exterior renovation | 2-storey expansion | Mechanical and electrical systems replaced throughout | New incoming electrical and communication services

Celebrating heritage

Key features of the original building were maintained and highlighted through the lighting design, which emphasized the brick exterior and vaulted ceilings in the Great Hall.

Header image credits: Shoalts and Zaback Architects Ltd.

Art Gallery of Ontario

AGO Transformation

HH Angus has been providing consulting engineering services to the Art Gallery of Ontario (AGO) since 1925. Today, the AGO is the 10th largest art gallery in North America.

World-renowned architect Frank O. Gehry designed AGO’s transformation. The project was both an addition (97,763 ft2) and renovation (187,000 ft2), and represented the final phase of a three-phase expansion. Innovative design features were implemented during the phased construction, installation, and commissioning, as well as in the integration of new and existing spaces.

Three main challenges were proposed by the client and the architectural team:

construction would have to be phased in order to provide ongoing service to galleries
sophisticated mechanical systems were needed to meet the specific requirements of each gallery, and these would have to be physically remote from the galleries for aesthetics
integration challenges would have to be overcome in connecting new systems to existing base systems.

The AGO is divided into 70 zones, with each gallery space fitted with dedicated sensors controlling the individual equipment in remote rooms. The mechanical systems were designed to be virtually invisible. The normal paraphernalia of the Heating, Ventilation, and Air Conditioning (HVAC) systems within the gallery viewing areas are not visible to visitors. Reducing fresh air intake during off-peak hours simplified the HVAC system control, and reduced the influence of fluctuations in outside temperature and humidity, providing more stable environmental conditions for the artwork.

The integration of new mechanical systems with existing systems made the already complicated assignment even more complex. The form and arrangement of the new and renovated spaces resulted in an irregularly-connected multi-level project. Interconnected atrium spaces required careful attention to ensure that mechanical services were concealed and that service access routes were maintained. The prediction of temperature- and pressure-induced airflow patterns, and arrangements to segregate returns for balancing return air to individual air handling units, required complex analysis.

In order to avoid the risk of water leakage, which would be a serious issue for the AGO’s collection, all mechanical rooms were located in no-impact areas away from gallery spaces. There is no equipment housed above gallery ceilings for the same reason.

The vertical transportation system includes three passenger elevators, one high capacity freight elevator, two material lifts, and two platform lifts to accommodate persons with physical disabilities. All elevators are of the “traction” type, with special design features to accommodate both large groups and the travel distances required.

We’re very proud to have been involved in the transformation of the AGO – one of Toronto's most important cultural venues.

SERVICES
Mechanical Engineering | Vertical Transportation

PROJECT FEATURES
Size: 486,000 ft2 | Status: Completed 2007

LOCATION
Toronto, Ontario

KEY SCOPE ELEMENTS
Phasing to permit ongoing operations | Sophisticated mechanical systems physically remote from galleries | Integration of new and old building systems | 3 passenger elevators, 1 high capacity freight elevator, 2 material lifts and 2 platform lifts | Complex analysis required to study temperature and pressure-induced airflow patterns and arrangements

Town of Innisfil

Innisfil Public Library

The Town of Innisfil lies on the western shore of Lake Simcoe, some 80 kilometres north of Toronto. From its beginnings as a lumber region, it evolved into a cottage community and then into a rural residential centre, as more and more cottagers turned their properties into year-round homes.

Today, permanent residents account for over 90% of the population, supported by expanded municipal services such as the community library.

HH Angus’ scope for this library renewal and expansion project included upgrading existing and adding new HVAC, plumbing, electrical and lighting systems in both the renovated and new spaces.

The site consisted of 11,500 ft2 (1,068m2) of existing space and an adjoining new construction of 11,000 ft2 (1,022m2).

SERVICES
Mechanical Engineering | Electrical Engineering | Lighting Design

PROJECT FEATURES
Size: 11,500 ft2 renovation and 11,000 ft2 of new construction | Status: Completed 2015

LOCATION
Innisfil, Ontario

KEY SCOPE ELEMENTS
Innovative-mechanical, electrical and lighting design for the library | Upgraded and added new HVAC, plumbing, electrical and lighting in both renovated and new spaces