Sixplex Design
in Toronto.
Toronto now permits six units as-of-right in nine wards, with no rezoning and no public meeting. But as-of-right only works if the drawings comply. Here is how sixplex zoning works, what our design services include, and how our project timeline takes you from first sketch to warranty.
The biggest zoning shift this city has seen in a generation.
Toronto needs housing, and it needs it on land the city already has. That is the logic behind the biggest zoning shift this city has seen in a generation. Since June 2025, owners in nine Toronto wards can build up to six units on a single residential lot with no rezoning, no Official Plan amendment, and no public meeting. If the building fits the rules, it goes straight to a building permit. That change is why sixplex design Toronto owners once dismissed as impossible has become one of the most practical low-rise investment strategies in the city.
It has also raised the stakes on the architecture. Six units on a standard lot is a tight puzzle. Setbacks, height, floor area, exits, fire separations, servicing, and rental layout all compete for the same space. Get it right and you build a durable income asset. Get it wrong and you spend a year at the Committee of Adjustment defending a plan that never had to be that way.
At 6ixDesign Architects, we design multiplexes for a living, and we do it as a full-service architecture and engineering practice. Here is how the rules work, what our sixplex design services include, and how we take a project from first sketch to warranty.
Why Sixplex Design Matters in Toronto
Toronto's housing shortage is not a forecast, it is the current condition. The city has targeted 285,000 new homes by 2031, and low-rise infill is core to reaching it. Sixplexes deliver real units on serviced lots inside established neighbourhoods, without the land assembly, tower crane, or five-year approval timeline of a mid-rise.
For owners and investors, the appeal is straightforward.
The owner's case.
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Land optimization
You already own the most expensive input. A sixplex spreads that land cost across six rent rolls instead of one, often the difference between a property that carries itself and one that does not.
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Financing access
Most owners miss this one. CMHC's MLI Select program requires a minimum of five units. A fourplex does not qualify. A sixplex does. The fifth and sixth units open the door to the most favourable purpose-built rental financing in the country.
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Long-term value
Purpose-built rental holds demand through market cycles better than single-family resale. A well-designed sixplex is an income asset with an exit, not a house you added rooms to.
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Reduced approval risk
Where a sixplex is as-of-right, a compliant design skips rezoning entirely. That is the single largest timeline saving available in Toronto low-rise development.
The catch is that "as-of-right" only means something if the drawings actually comply. Sixplex design Toronto approvals hinge on that detail. It is a design problem before it is a planning problem, and it is where an experienced multiplex architect Toronto owners can rely on earns their fee.
Understanding Toronto's As-of-Right Sixplex Rules
In June 2025, City Council adopted amendments permitting up to six units and four storeys in a residential building as-of-right, but only in nine of the city's 25 wards. The City's Multiplex Housing page confirms they are in force.
Those wards sit mostly in Toronto and East York. Everywhere else the ceiling is still four units, and other wards can opt in over time. So the first question on any sixplex is not how big your lot is, but where it sits. Send us your address and we will confirm what your property allows.
If you are not in a sixplex ward, you still have options. A fourplex is permitted citywide, garden and laneway suites can add units, and the City's Expanding Housing Options in Neighbourhoods initiative opens other paths.
The zoning envelope still applies
Toronto as-of-right sixplex permission changes the permitted use. It does not suspend the rest of Zoning By-law 569-2013. Your design must still respect:
that still bind
- Height and number of storeys
- Front, side, and rear yard setbacks
- Lot coverage and floor space index
- Soft landscaping and permeable area
- Angular planes and separation from neighbouring buildings
- Waste storage, servicing, and amenity requirements
Miss any one of these and you are filing a minor variance. Sometimes that is the right call, but a sixplex zoning Toronto review at concept stage usually tells you whether six units fit the envelope before you spend money finding out. You can look up your own property on the City's Zoning By-law Interactive Map.
Parking and development charges
Toronto removed minimum parking requirements for most new residential development, so a sixplex generally does not need to provide parking spaces at all.
Where parking still matters to your tenant profile or resale strategy, there are ways to get it without surrendering rentable area. Car elevators, stacked and mechanical systems, tandem stalls, and laneway-accessed pads all work on constrained lots. We model these during concept design so you can see what each costs in dollars and in square footage.
Council has also exempted sixplex units from development charges and parkland dedication, which materially improves economics on small builds. Both are policy positions that can change, so confirm current requirements for your property before relying on them.
Ontario Building Code considerations
Here is a point that catches many owners off guard. A three-storey sixplex within the area limits is typically designed under Part 9 of the Ontario Building Code. Push to four storeys and it generally falls under Part 3, which brings different requirements for fire resistance, exiting, sprinklers, and structural design.
That single decision changes your budget, your consultant team, and your schedule. It belongs in concept design, not in a permit comment three months later. We raise it in the first meeting, because it is the fork in the road that sets what the rest of the project costs.
As-of-right only means something if the drawings actually comply.
What Is Included in Our Sixplex Design Toronto Services?
Our sixplex design Toronto service carries a project end to end. Because architecture and engineering sit under one roof, you are not managing five disconnected consultants yourself.
End to end.
Thirteen deliverables · one roof- 01
Feasibility studies
Unit count, massing, and preliminary yield against your zoning
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Existing condition drawings
Measured survey and as-built documentation for conversions
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Concept design
Options testing for unit mix, circulation, and rentable area
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Architectural design
Plans, elevations, sections, and material selections
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Structural engineering
In-house design and review, coordinated with the architecture from day one
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MEP engineering services
Mechanical, electrical, and plumbing design in-house, including HVAC strategy, service sizing, and energy performance modelling
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Zoning review
A line-by-line check against By-law 569-2013 and applicable overlays
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Building permit drawings
Full sets coordinated for Toronto Building review
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Committee of Adjustment support
Variance strategy, drawings, and hearing materials
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Site Plan Approval
Where a project’s scale or context triggers it
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Consultant coordination
Geotechnical, arborist, surveyor, heritage, and energy specialists
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Construction documentation
Tender-ready drawings and specifications
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Builder coordination
RFIs, shop drawing review, and site clarification
Every one of these is a place a project can stall. Handling architecture and engineering together is why our permit timelines hold: the coordination problems that usually surface at permit review get solved in-house months earlier.
Curious what this looks like in practice? Our project portfolio shows multiplex and low-rise residential work across Toronto and East York, including projects completed, approved, and currently under construction.
Our Sixplex Design Process
Every sixplex design Toronto project we take on runs on the same timeline we use for all our multiplexes. Fifteen steps, grouped into five stages, with a defined deliverable at each one so you always know where your project stands.
Project Timeline
Fifteen steps · Five stages · Concept to warrantyWant to discuss where your property fits in this timeline? Book a planning consultation and we will review your address before you spend a dollar on design.
Benefits of Working with 6ixDesign Architects
Six reasons owners bring a multiplex to us rather than to a general practice.
Why us.
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Full-service architecture and engineering
Architectural, structural, and MEP engineering all sit in-house. That removes the coordination gap where most multiplex projects lose time and money, and it means one team is accountable for the whole set.
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Multiplex expertise across the GTA
We have designed multiplexes throughout Toronto and the surrounding region. Volume matters here: the second sixplex you design is faster and cleaner than the first, and we are well past our first.
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Toronto expertise, specifically
We work in Toronto's by-laws every week. A firm that designs across Ontario broadly will not know that Zoning By-law 569-2013 treats your lot differently from the one across the street.
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Permit experience
We know what Toronto Building examiners flag, because we have answered those comments many times. Our sets are built to survive first review. When a variance is unavoidable, we build the case properly, with drawings that show neighbourhood fit rather than just the deficiency.
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Investor-focused design
We design to a pro forma, protecting rentable area, keeping layouts leasable, and avoiding structural gymnastics that add cost without adding rent.
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Financing-aware, sustainable design
Because we work on CMHC MLI Select projects, we understand how design choices affect scoring on affordability, accessibility, and energy performance. Energy performance is no longer only an environmental choice. Under MLI Select it is points, and points are financing terms.
2026
MLI Select's energy-efficiency scoring baseline tightens for new construction applications filed after September 30, 2026. Projects still in design should be having that conversation now, because it affects both your performance targets and your amortization.
Frequently asked questions.
—01How much does sixplex design cost in Toronto?
Fees depend on scope, site complexity, new construction versus conversion, and whether variances are required. A straightforward as-of-right new build costs less to design than a heritage-adjacent addition needing Committee of Adjustment support. We quote fixed fees by phase after a site review, so you know your cost before you commit. Contact us for a project-specific quote.
—02Do I need a zoning review?
Yes, and it should come first. Every sixplex design Toronto project should open with a zoning review, because it tells you what you can actually build before design begins. Skipping it is the most common and most expensive mistake we see in Toronto multiplex design.
—03Can I build a sixplex as-of-right?
Only if your property is in one of the nine permitted wards and your design fits the zoning envelope. Both conditions must be met. Outside those wards, four units is the current citywide maximum unless the ward opts in.
—04How long does the permit process take?
For a fully compliant as-of-right sixplex, expect a few months from submission to issuance, depending on Toronto Building's workload and how clean the set is. Add roughly four to six months if a Committee of Adjustment application is required. We give you a realistic schedule at feasibility, not an optimistic one.
—05Can you help with CMHC MLI Select?
Yes. We design with MLI Select scoring in mind and coordinate the architectural and engineering inputs your lender and energy consultant need. Sixplexes qualify because they meet the five-unit minimum. We are not mortgage brokers and do not give financing advice. We make sure the building supports the application.
—06Do you provide construction drawings?
Yes. We produce full permit and construction documentation, including details and specifications your builder can price and build from.
—07Can you coordinate engineers?
We do more than coordinate them. Structural and MEP engineering are delivered in-house through our engineering division, so the disciplines are aligned before anything reaches the City. We coordinate external specialists such as geotechnical, arborist, and surveying consultants where a project needs them.
—08Do you handle parking on tight lots?
Yes. Toronto does not require parking for most new residential development, but where you want it, we assess car elevators, mechanical and stacked systems, tandem stalls, and laneway access during concept design, so you can weigh the cost against the rentable area it consumes.
—09Do you design garden suites too?
Yes. Garden suite design is a core service. On lots where a sixplex is not permitted, a garden suite or laneway suite is often the strongest way to add density and income.
Start Your Sixplex Design Toronto Project
Toronto has opened a genuine window. In nine wards, six units are permitted as-of-right, development charges are waived, parking minimums are gone, and CMHC financing is built for this exact building type. The policy work is done. What remains is design, and design decides whether your project clears permit in months or stalls for a year.
Sixplex design Toronto projects reward precision. The right unit mix, the right code path, and a permit set that survives first review are worth more than any single line in your budget.
6ixDesign Architects designs multiplexes across Toronto, East York, and the GTA, with architecture and engineering under one roof. If you own a property in one of the nine sixplex wards, or you are evaluating one to buy, we will review your address and give you a clear path to permit.
Send us your address. We start with a zoning review.
Architecture, structural and MEP engineering under one roof, for sixplexes and multiplexes across Toronto, East York and the GTA. Not a sales pitch.
