Toronto Releases Free Fourplex and Sixplex Plans: What Pre-Approved Designs Mean for Owners, Investors and Building Timelines
The City of Toronto has added four multiplex designs to its Pre-Approved Building Plans Program: two fourplexes and two sixplexes, each drawn for narrow or wide lots. LGA Architectural Partners designed the plans with accessibility, climate resilience, cost and ease of construction as priorities. Owners whose properties meet zoning requirements can now download the plans at no cost and proceed directly to building permit applications without Committee of Adjustment review, provided the design remains unmodified.
The program aims to make adding dwelling units faster and less expensive for property owners across Toronto, supporting the creation of missing middle housing options in neighbourhoods where multiplex development is now permitted citywide.
Key Takeaways
- Toronto released four free multiplex designs: two fourplexes and two sixplexes, each for narrow or wide lots, through its Pre-Approved Building Plans Program.
- Owners whose properties fit zoning rules can go straight to building permit applications without Committee of Adjustment review when using the plans as designed.
- Any modification to the plan, including HVAC or plumbing changes, voids the pre-approved status.
- Fourplexes are allowed anywhere in Toronto; sixplex permissions depend on property location.
- Site-specific work for mechanical, HVAC, plumbing, architectural and structural components still requires qualified design professionals.
What the Pre-Approved Plans Include
Each of the four designs comes in multiple HVAC configurations. Fourplexes are available in electric, gas and hybrid versions; sixplexes in electric and hybrid. The plans are pre-reviewed for Ontario Building Code and zoning compliance, meaning the building as designed meets City requirements.
Owners do not need to submit a copy of the plan with their building permit application, only reference the plan number and chosen HVAC type. A building permit is still required.
The program previously offered plans for garden and laneway suites. The multiplex designs extend the same approach to larger projects.
How the Process Works
Property owners download the plan that fits their lot dimensions and HVAC preference. If the multiplex fits zoning rules for the property, the owner can apply for a building permit without Committee of Adjustment review.
Pre-approval covers the building as designed. Zoning and Ontario Building Code requirements related to building placement on the property are reviewed during the building permit application process.
Site-specific work remains the owner's responsibility. Mechanical, HVAC, plumbing, architectural and structural components require qualified design professionals to adapt the plan to the specific property. Any modification to the plan, including changes to HVAC or plumbing, voids the pre-approved status.
The homeowner or designer using the plan remains responsible for the design and ensuring compliance with applicable law.
What It Means for Buyers and Investors
Buyers looking for rental income or multi-generational living can now evaluate fourplex and sixplex feasibility on Toronto properties more quickly. The free plans remove the cost and delay of custom architectural work for owners whose lots match the narrow or wide templates.
Investors can assess multiplex potential on properties they are considering, though the economics depend on construction costs, site-specific professional fees, and whether the lot permits sixplexes or only fourplexes. Fourplexes are allowed anywhere in Toronto; sixplex permissions depend on property location.
For those exploring Toronto and the GTA listings, properties with lot dimensions that align with the pre-approved templates may offer a faster path to adding rental units than lots requiring custom designs or variances.
What It Means for Sellers
Sellers with lots that permit multiplex development may find their properties more attractive to buyers who can immediately envision adding rental units using the City's turnkey designs. A lot that fits the narrow or wide templates and permits sixplexes offers more development potential than one restricted to fourplexes or requiring custom plans.
Owners considering whether to build before selling or list the property as-is can now evaluate the fourplex or sixplex option without commissioning custom architectural work.
Borrowing Context
The Bank of Canada policy interest rate stands at 2.25 percent as of October 2026. The conventional mortgage five-year posted rate at major chartered banks is 6.19 percent as of October 2026, though most borrowers negotiate rates below the posted figure.
Owners financing multiplex construction will need to account for borrowing costs alongside construction, professional fees and permit expenses. The pre-approved plans reduce one cost — custom architectural work — but do not eliminate the need for site-specific professional services.
Construction Cost and Housing Price Context
The new housing price index for Toronto stood at 120.4 in August 2026, down from 122.9 in August 2025. Construction costs and professional fees will vary by property and contractor.
The pre-approved plans aim to make the process faster and less expensive, but the total cost of building a fourplex or sixplex depends on site conditions, material choices and labour rates.
Frequently Asked Questions
Can I modify the pre-approved plans?
No. Any modification, including HVAC or plumbing changes, voids the pre-approved status. Owners who modify the plans must go through the standard approval process.
Do I still need a building permit?
Yes. The pre-approved plans streamline the process, but a building permit is still required.
What if my lot does not fit the narrow or wide templates?
You will need custom architectural work. The pre-approved plans are designed for specific lot dimensions.
Are sixplexes allowed on my property?
Fourplexes are allowed anywhere in Toronto. Sixplex permissions depend on property location and zoning rules.
Do the plans include all the work I need to get a building permit?
No. Site-specific work for mechanical, HVAC, plumbing, architectural and structural components requires qualified design professionals. The pre-approved plans cover the building design, but adapting it to your property is your responsibility.
What to Consider
| Factor | Fourplex | Sixplex |
|---|---|---|
| Allowed where | Anywhere in Toronto | Depends on property location |
| HVAC options | Electric, gas, hybrid | Electric, hybrid |
| Lot templates | Narrow or wide | Narrow or wide |
| Pre-approval | Yes, if unmodified | Yes, if unmodified |
| Site-specific work | Required | Required |
Owners considering a multiplex project can download the plans and consult with design professionals to determine site-specific costs and feasibility. The pre-approved status applies only when the plan is used exactly as designed.
For buyers and investors evaluating properties in neighbourhoods such as Agincourt, Bayview Village or Bedford Park, the availability of free multiplex plans adds a new dimension to assessing development potential on qualifying lots.
Outlook
The Pre-Approved Building Plans Program removes one barrier to multiplex development in Toronto by offering free, pre-reviewed designs. The program does not eliminate the need for site-specific professional work, building permits or compliance with zoning rules, but it does make the process faster and less expensive for owners whose properties fit the templates.
Whether the program leads to a significant increase in fourplex and sixplex construction depends on construction costs, borrowing conditions, rental market fundamentals and whether owners choose to build or sell.
For those exploring multiplex options or looking for properties with development potential, Renanza can help you assess Toronto and the GTA homes for sale and connect you with professionals who can evaluate feasibility on specific lots.
Sources & References
- City of Toronto — Pre-Approved Building Plans (October 2026)
- Bank of Canada — Target for the overnight rate (policy interest rate) (October 2026)
- Bank of Canada — Conventional mortgage, 5-year posted rate (major chartered banks) (October 2026)
- Statistics Canada — New housing price index, monthly (August 2026)
- Storeys — Toronto Rolls Out Pre-Approved Fourplex, Sixplex Plans (October 2026)
Data last checked: 2026-10-08
