Mixed-Use Co-Ownership in Quebec: Residential and Commercial

Divided co-ownerships comprising dwellings and commercial premises are common in Greater Montreal. These “mixed-use” buildings combine residential condos, local businesses and sometimes offices. They add value to the neighbourhood, but require precise governance and rules.

In a Quebec mixed-use co-ownership, the declaration of co-ownership (DCV) must reconcile two realities. The comfort and peace of mind of co-owners on one hand. The operational needs of businesses on the other. The key lies in a clear declaration of co-ownership, suitable by-laws of the immovable and rigorous day-to-day management (up to date as at 2026-06-27).

This article presents the legal framework, administrative and financial management practices, as well as practical advice for harmonious cohabitation between residential and commercial uses.

Definition and legal framework of mixed-use co-ownership

A mixed-use co-ownership brings together, within the same divided co-ownership, private portions for residential use and private portions for commercial use. The declaration of co-ownership specifies the destination of the building and of each portion, as well as the relative value of the fractions.

• Private portions: residential condos and commercial premises belonging to different co-owners.
• Common portions: lobbies, structure, roofs, elevators, building envelope, and sometimes parking spaces or ducts.
• Common portions for restricted use: balconies, terraces, parking spaces or technical spaces reserved for certain co-owners.

The Civil Code of Quebec governs the destination, use, allocation of common expenses and decisions of the meeting (see, in particular, the rules regarding the destination, the declaration of co-ownership, contributions to expenses and qualified majorities). Refer to the relevant provisions of the Civil Code of Quebec without quoting them verbatim, as well as to your building’s declaration of co-ownership, which remains the primary applicable source.

Useful resources:

• Civil Code of Quebec (co-ownership): https://www.legisquebec.gouv.qc.ca/fr/document/lc/CCQ-1991
• Co-ownership best practices: https://rgcq.org/ressources/

To address these issues, structured administrative management is essential. See our co-ownership secretarial, annual general meeting and minutes services: administrative services.

Declaration of co-ownership and by-laws of the immovable: key clauses in a mixed-use context

The declaration of co-ownership and the by-laws of the immovable must specify the commercial operations compatible with residential use. The objective is simple: prevent conflicts by defining expectations from the outset.

Elements to cover without ambiguity:

• Destination and permitted uses: types of businesses permitted or prohibited based on the destination of the immovable and the urban sector. For example, activities involving significant nuisances or heavy nighttime traffic may be excluded if peace and quiet are essential.
• Opening and delivery hours: regulate early-morning deliveries, waste collection and receipt of merchandise to limit noise.
• Signs and signage: display, lighting, size and location standards for permitted signs to preserve the appearance of the common portions.
• Nuisance management: noise, cooking odours, smoke, vibrations and lineups. Require suitable technical systems (independent ventilation, hoods and silencers), with technical approval before work begins.
• Traffic and access: separate access points where possible, resident safety, and access control for elevators and technical rooms.
• Waste and recycling: dedicated spaces, storage and removal schedules, and enhanced cleaning in the case of food-related activities.
• Terraces and occupancy of private property: capacity limits, hours, maintenance and responsibility for damage to the common portions.
• Insurance and liability: proof of insurance for businesses and indemnification clauses in the event of damage to the common portions or other co-owners.

Amendments to the declaration of co-ownership or rules affecting the destination or use require the qualified majorities provided for in the Civil Code of Quebec and careful drafting. Professional assistance facilitates the notice of meeting, voting and recording in the syndicate’s register. To structure your documents and annual general meeting processes, explore our administrative management services and our blog for practical guides.

Governance, annual general meetings and allocation of voting rights

In a mixed-use building, the relative value of commercial fractions may be higher, and their voting weight at the annual general meeting may therefore be greater as well. The board of directors must seek a balance between residential and commercial interests without undermining the destination of the immovable established by the declaration of co-ownership.

Best practices:

• Transparent notices of meeting and separate agendas for commercial and residential issues.
• Annual general meeting and special meeting schedules suited to business owners and residents, with hybrid options where needed.
• Detailed minutes identifying the impacts on each group and the majorities required.
• A cohabitation or commercial relations committee to address complaints and technical recommendations promptly.

The powers of the board of directors, quorum and voting rules are determined by the Civil Code of Quebec and the declaration of co-ownership. Document sensitive decisions, keep technical reports in the register and clearly inform co-owners. The RGCQ offers useful resources for preparing your meetings: guides and tools.

Finances: common expenses, allocation keys and contingency fund

The basic principle in mixed-use co-ownership remains each fraction’s contribution to the common expenses according to its relative value, as indicated in the declaration of co-ownership. Certain expenses may be allocated only among the co-owners who benefit from them, especially where restricted-use common portions or dedicated equipment are involved.

Financial points to watch:

• Specific operating expenses: commercial ventilation, grease traps, additional cameras and loading docks. Allocate these costs to the relevant fractions if the declaration of co-ownership permits.
• Syndicate insurance: watch for commercial activities that may increase the premium and deductible; adjust the allocation if provided for.
• Service metering: sub-metering for water, electricity or gas used by commercial premises to avoid cross-subsidization.
• Contingency fund: fund it according to the contingency fund study (EUC) and maintenance logbook required by Bill 16 (up to date as at 2026-06-27). Commercial systems (roofs with equipment, ventilation risers) affect schedules and budgets.
• Sales taxes: certain operations related to commercial activities may be subject to GST/QST. Check your tax situation and the nature of the syndicate’s incidental revenues.

Consult the official references:

• Allocation and contributions: Civil Code of Quebec
• QST and GST for businesses: Revenu Quebec

To safeguard your budgets, our teams handle budget preparation, assessment collection and financial statement monitoring. See our financial management services.

Examples of allocation keys to consider

• Ventilation for a ground-floor restaurant: maintenance and cleaning costs charged to the commercial fractions served.
• Main elevator: general allocation according to relative value, unless a service elevator serves only the commercial area.
• Indoor parking: maintenance and security charged to co-owners holding parking spaces, according to the parameters of the declaration of co-ownership.

Operations and cohabitation: day-to-day logistics

Successful cohabitation depends on simple, known and consistently applied operating rules. The board of directors must plan traffic flows and impose technical standards consistent with the mixed-use destination.

• Access and security: separate card readers, cameras at commercial entrances and delivery controls to prevent passage through residential corridors.
• Waste management: a dedicated room for food businesses, procedures to prevent odours and pest infestations, and increased cleaning.
• Noise and vibrations: acoustic insulation requirements for commercial equipment (condensers and hoods), as well as maintenance schedules.
• Work and compliance: any commercial project affecting the building envelope or ventilation requires plans, insurance and RBQ compliance. Check the contractors and municipal permits.
• Signs and signage: compliance with the by-laws of the immovable and municipal by-laws, while respecting the appearance of the common portions.

For work and contractor compliance, consult the Regie du batiment du Quebec (RBQ). A syndicate we assist reduced noise complaints after requiring technical validation of equipment and restricting delivery schedules. Clear rules and consistent follow-up make all the difference.

FAQ

Q1. Can certain types of businesses be prohibited in a mixed-use co-ownership?

Yes, if the destination of the immovable and the declaration of co-ownership provide for it. The prohibition must be objective and connected to risks or nuisances incompatible with residential use. Any change to permitted uses must follow the qualified majorities provided for in the Civil Code of Quebec and be recorded in the register.

Q2. Who pays for work on an elevator used mainly by businesses?

By default, elevators are common portions and their costs are allocated according to relative value. However, if an elevator serves the commercial portion exclusively or primarily and the declaration of co-ownership specifies this, a specific allocation key may apply only to the relevant fractions.

Q3. Are condo fees taxable for commercial premises?

Syndicate assessments are not automatically subject to sales taxes. It depends on the nature of the goods and services provided and the syndicate’s taxable operations. Confirm your situation with Revenu Quebec, especially where incidental revenues are involved.

This article provides general information and does not constitute legal advice. Consult a lawyer or notary regarding your situation.

This article provides general information and does not replace advice from a tax specialist or accountant. Refer to Revenu Quebec and the CRA for the exact rules.

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