When is an Architect Mandatory in Quebec? Complete Guide to the Architects Act
Understanding Section 16 of the Quebec Architects Act, exemption criteria for single-family homes and duplexes/triplexes (< 600 m²), and when licensed seals are legally mandatory.
Table of Contents
- The Quebec Legal Framework
- Section 16: The Legal Exemption Criteria
- Residential Buildings: Precise Thresholds
- Commercial & Business Buildings
- Alterations & Interior Renovations
- Frequently Asked Questions
- Technical Consultation
The Quebec Legal Framework
In Quebec, building design practice is governed by the Architects Act (CQLR, chapter A-21) and overseen by the Ordre des architectes du Québec (OAQ).
However, contrary to widespread misconception, not all building projects require the mandatory commissioning of a licensed architect. Quebec legislation clearly establishes non-assujetti (exempt) categories where owners may freely work with independent spatial designers and BIM technical coordinators.
Section 16: The Legal Exemption Criteria
Section 16 sets the rule that architectural plans must be stamped by a licensed architect, while enumerating explicit exemptions based on:
- Primary building occupancy
- Number of stories above grade and basements
- Building footprint area (aire de bâtiment in square meters)
When your project falls beneath all threshold ceilings, municipal boroughs in Montreal issue building permits without requiring an architect’s seal.
Residential Buildings: Precise Thresholds
1. Isolated Single-Family Homes
- Maximum 2 stories above ground level.
- Maximum one single basement.
- Building footprint under 600 m² (approx. 6,458 sq ft).
2. Duplexes, Triplexes, and Row Houses
- Semi-detached and row homes under the same 2-story and 600 m² footprint ceiling.
- Multi-family buildings containing up to 4 dwelling units (duplex, triplex, quadruplex).
- At 5 units or more, or at 3 stories above grade, a licensed architect is required by law.
Explore our plans for non-assujetti buildings service or test your project with our interactive permit threshold tool.
Can I design my own home plans in Quebec?
Yes. Under Section 16 of the Architects Act, plans for an isolated single-family home of 2 stories or fewer with a building footprint under 600 m² do not legally require an architect stamp. You can commission an independent building designer or technologist.
When is an architect mandatory for a multi-family building?
As soon as a building contains more than 4 residential dwellings, exceeds 2 stories above grade, or surpasses legal building footprint thresholds, a licensed architect (OAQ member) is mandatory.
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