The Les Terrasses de la Chaudière Envelope Replacement Project

The LTDLC complex was built in the heart of Gatineau between 1976 and 1978. Composed of four office towers of varied heights (7, 9, 19 and 28 storeys) linked by a retail concourse, the complex provides accommodation for approximately 6,000 full time federal employees and over 142,000 m2 of leasable space, making it one of the largest federal office complexes in Canada.

The Les Terrasses de la Chaudière (LTDLC) envelope replacement project is a major rehabilitation of the exterior envelope of all the buildings within the complex to address health and safety concerns. The project will provide a higher-performing envelope, which will reduce Greenhouse Gas (GHG) emissions, utility costs as well as improve occupant comfort and well-being.

The project consists of variation of curtain wall systems to serve two purposes: breaking down the masses and meeting various facades orientation and performance criteria. The proposed material palette is limited to two main elements: glass and ceramic panels. Four types of triple glazed curtain wall system (A, B, Bb, C) are proposed to break-up the Megablock massing, and ceramic panels are proposed in podiums as tactile material to integrate with the surroundings at pedestrian scale. The existing brick cladding at ground floor level will remain in place until the full rehabilitation of the complex. The project will also require the abatement and removal of asbestos containing materials within the perimeter of the exterior walls.

The buildings have not been designated by the Federal Heritage Buildings Review Office. However, the buildings are positioned in a strategic location in the National Capital Area. The site is part of the urban fabric of downtown Gatineau where Town meets Crown, and it is adjacent to Laurier Street which forms part of Confederation Boulevard. In addition to Place du Portage, the LTDLC has a significant presence in the Nation's Capital's silhouette and contributes to define the skyline of Gatineau.


Latest update

November 22, 2023 – The authorities issued the Notice of Determination and determined that the project is not likely to cause significant adverse environmental effects.


Key documents

Key documents
Document Number Document Title File Date
1 The Les Terrasses de la Chaudière Envelope Replacement Project - January 4, 2024
2 Notice of Determination - PSPC, NCC - November 22, 2023


Environment, Health and Safety
Public Services and Procurement Canada
11 Laurier Street
Portage III, Place du Portage
Gatineau, Quebec K1A 0S5

  • Location

    • Les Terrasses de la Chaudière Site (Ontario)
  • Nature of Activity

    • Other, not otherwise specified
  • Assessment Status

  • Start Date

  • Proponent

  • Authorities

    • Public Services and Procurement Canada
  • Assessment Type

    Project on federal lands
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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