Can You Convert an Old Factory into Commercial and Residential Space in Ontario?

As Ontario continues to redevelop older industrial areas, many vacant factories are being transformed into vibrant commercial and residential spaces. From retail stores and offices on the ground floor to loft apartments and condominiums above, factory conversions have become an increasingly attractive option for developers and property owners looking to maximize the value of existing buildings.

However, converting a factory into a mixed-use property involves much more than a typical renovation. It requires careful planning, zoning approval, structural assessment, mechanical upgrades, and compliance with the Ontario Building Code.

In this guide, we'll explain what you need to know before converting an old factory into commercial and residential space in Ontario.

Why Are Factory Conversions Becoming More Popular?

Many factories built decades ago are no longer suitable for modern manufacturing but remain structurally valuable. Their large open floor plans, high ceilings, steel or reinforced concrete construction, and industrial character make them ideal candidates for adaptive reuse.

Instead of demolishing these buildings, many owners choose to repurpose them into:

• Retail shops
• Restaurants and cafés
• Office spaces
• Medical clinics
• Creative studios
• Loft-style apartments
• Mixed-use commercial and residential developments

Adaptive reuse not only preserves existing structures but also supports sustainable development by reducing construction waste and making better use of existing infrastructure.

Is It Legal to Convert a Factory into Commercial and Residential Space?

Yes—but only if the project complies with municipal zoning regulations and provincial building requirements.

Many factories are located in industrial zones where residential use may not be permitted. Before purchasing or renovating a property, you should verify:

• Current zoning designation
• Permitted land uses
• Official Plan policies
• Parking requirements
• Density and height restrictions

If residential use is not permitted, you may need a zoning amendment, minor variance, or other municipal approvals before construction can begin.

Understanding "Change of Use"

One of the most important aspects of a factory conversion is the Change of Use process.

Factories are originally designed for industrial occupancy. Converting them into commercial or residential space changes how the building is used and often triggers additional code requirements.

A change of use may require upgrades to:

• Fire protection systems
• Emergency exits
• Accessibility features
• Structural capacity
• Mechanical and ventilation systems
• Washrooms and plumbing
• Energy efficiency

Working with experienced design professionals early in the planning process can help identify these requirements before construction begins.

Structural Assessment Comes First

Although many older factories are built with durable materials, every building should undergo a professional structural assessment before redevelopment.

An engineer may inspect:

• Foundations
• Concrete slabs
• Steel framing
• Roof structure
• Exterior masonry
• Floor loading capacity

Some buildings may require reinforcement to support new residential layouts, elevators, rooftop equipment, or additional floors.

HVAC Planning Is Often More Complex Than Expected

One of the most overlooked parts of a factory conversion is the HVAC system.

Industrial buildings were designed for manufacturing—not for comfortable living or customer-facing commercial spaces.

A complete mechanical redesign is often necessary to provide:

• Heating and cooling for residential units
• Ventilation for commercial tenants
• Fresh air intake
• Exhaust systems
• Energy-efficient air distribution
• Proper indoor air quality

If restaurants or commercial kitchens are included, specialized exhaust and make-up air systems may also be required.

Early HVAC planning helps avoid costly design changes later in the project.

Building Permits and Ontario Building Code

Nearly every factory conversion requires a building permit before construction begins.

Depending on the project, approvals may involve:

• Architectural drawings
• Structural engineering
• Mechanical design
• Electrical plans
• Plumbing design
• Fire protection review

Municipal building departments will review the submitted plans to ensure they comply with the Ontario Building Code and other applicable regulations.

Obtaining the proper approvals before construction helps reduce delays and unexpected revisions during the project.

Common Challenges During Factory Conversions

Every adaptive reuse project is unique, but common challenges include:

• Aging building materials
• Limited insulation
• Outdated electrical systems
• Older plumbing infrastructure
• Environmental remediation
• Fire code upgrades
• Accessibility improvements
• Existing structural limitations

Identifying these issues during the planning stage allows owners to make informed decisions and develop a realistic renovation strategy.

Is Converting a Factory Worth It?

While factory conversions can be more complex than standard renovations, they also offer significant long-term potential.

A successful mixed-use redevelopment can:

• Increase property value
• Generate multiple rental income streams
• Revitalize underused buildings
• Preserve architectural character
• Support sustainable urban development

For many investors and property owners, adaptive reuse provides opportunities that new construction cannot easily replicate.

Frequently Asked Questions

Can I convert any old factory into residential units?

Not always. Zoning regulations, building condition, and municipal approvals will determine whether a conversion is possible.

Do factory conversions require a building permit?

Yes. Most projects involving structural changes or a change of use require permits and professional design drawings.

Can I combine commercial and residential uses in one building?

In many municipalities, mixed-use developments are permitted when zoning and building code requirements are satisfied.

Does an old factory need a completely new HVAC system?

In many cases, yes. Existing industrial mechanical systems are rarely suitable for residential comfort or modern commercial occupancy.

Is adaptive reuse better than demolition?

For many properties, adaptive reuse can preserve valuable buildings, reduce environmental impact, and create unique commercial and residential spaces while supporting community revitalization.

Final Thoughts

Converting an old factory into commercial and residential space is a complex but rewarding redevelopment opportunity. Success depends on careful planning, zoning compliance, structural evaluation, mechanical design, and coordination among architects, engineers, and construction professionals.

With the right team and a well-planned strategy, an abandoned industrial building can be transformed into a modern mixed-use property that serves businesses, residents, and the surrounding community for years to come.

Reno Compass

Reno Compass provides professional renovation and project management services for adaptive reuse and complex renovation projects across Ontario.

Whether you're planning a whole home renovation, commercial renovation, building conversion, warehouse redevelopment, barn conversion, or mixed-use adaptive reuse project, our team works closely with property owners, designers, and construction professionals to help coordinate every stage—from planning and permit preparation to construction management and project completion.

If you're considering transforming an older industrial building into a functional commercial and residential space, proper planning is the first step toward a successful project.

Recommended Reading 

• What Is Adaptive Reuse? — Learn how older buildings such as churches, barns, warehouses, and factories can be successfully repurposed for modern residential and commercial use.
• Can You Convert an Old Church into a Home in Ontario? — Explore the planning process, zoning considerations, structural challenges, and renovation requirements involved in transforming a historic church into a livable home.
• Can You Convert an Old Barn into a Home in Ontario? — Discover what it takes to convert an agricultural barn into a comfortable residential property while meeting Ontario building regulations.
• Warehouse to Loft Conversion in Ontario — Learn why warehouse-to-loft projects have become increasingly popular and what owners should consider before starting a conversion.