Toronto changed the rules. Most residential lots now permit up to four units as-of-right. Nine downtown and East York wards permit six. The design problem looks similar from the street, but inside the drawings the constraints have moved. Architects working on multiplex projects today design against a different set of rules than the ones they trained on in contemporary urban architecture.
Quick Answer
Toronto’s multiplex bylaws now permit fourplexes citywide and sixplexes in nine wards. The city waives development charges on the first six units, parking minimums no longer apply, and the maximum building height stands at 10.5 metres. The design problem has shifted from what is allowed to what works inside the new constraints.
• Fourplexes became as-of-right citywide in 2023
• Sixplexes became as-of-right in the nine wards of Toronto and East York District plus Ward 23 in June 2025
• Bedroom caps: 3 per unit on average in buildings with 3 or more units; 8 maximum in a duplex
• Lots with 5 or 6 units cannot also include a laneway or garden suite
The reform happened in two stages.
In 2023, Toronto made duplexes, triplexes, and fourplexes as-of-right on most residential lots citywide, regardless of the lot’s existing RD, RS, RM, or RT designation. No rezoning. No Committee of Adjustment when the design meets the standards.
In June 2025, City Council passed a zoning bylaw amendment extending the permission to fiveplexes and sixplexes in the nine wards of Toronto and East York District plus Ward 23 in Scarborough North. Maximum height moved from 10.0 metres to 10.5 metres. Parking minimums no longer apply.
The city waives development charges on the first six units, including any combination with a laneway or garden suite. The waiver has reshaped the financial argument for owners. It has also reshaped what owners now ask architects to draw.
What looks like freedom on paper has hard edges in practice. Four constraints define every multiplex drawing in Toronto today.
• Bedroom caps. Duplexes cap at eight bedrooms. Triplex through sixplex cap at three bedrooms per unit on average (12 in a fourplex, 18 in a sixplex). The cap discourages rooming-house conversions.
• No ancillary dwellings on five and six unit lots. A lot with a fiveplex or sixplex cannot also include a laneway or garden suite. The choice becomes one or the other.
• Lots of coverage and setbacks. Side yard setbacks step up to 1.5 metres for buildings of five or more units. Front setback 6 metres, rear 7.5 metres. Building depth typically caps around 17 metres.
• Height envelope. The 10.5 metre ceiling caps interior layouts at three to four storeys, with angular planes setting back upper floors to limit shadowing on adjacent properties.
The architects whose multiplex drawings build cleanly share a small set of habits.
They stack. Plumbing risers, mechanical chases, and electrical runs align vertically across floors. Stacking saves trade time and reduces acoustic transmission through misaligned penetrations.
They design for daylight in basement units. Window wells, light wells, and basement ceiling heights at or above 2.4 metres turn a code-compliant box into a rentable space.
They preserve cross-ventilation. Narrow Toronto lots make north-south cross-flow difficult; a unit with operable windows on two exposures rents faster and operates cheaper.
Most importantly, they coordinate with whoever will build the project. A Toronto multiplex builder reads the drawings looking for assemblies that work at current trade pricing, egress that holds up to inspection, and mechanical rooms sized for the project.
Some failures repeat across enough projects to predict.
Egress drawn at the minimum. A 900mm clear width with a tight return at the top of the run looks fine in plan and fails in inspection. Egress for multi-unit residential needs slack on the small lots that now host four to six units.
Sound isolation done in drywall. Acoustic separation lives in the structure: resilient channel, double studs, sealed penetrations. Gypsum applied without care produces a sixplex where every tenant hears the others.
Mechanical rooms that erode unit area. Independent HVAC for four to six units takes more space than a single-family build. Drawings that allocate one closet force the builder to choose between code compliance and the interior layout.
Waste and storage. Six units produce six sets of bins. Drawings without dedicated provision create operating problems the owner sees in the first month.
As-of-right permission does not mean every lot accommodates the maximum. A sixplex needs frontage, depth, and a workable grade.
Lots under 7.5 metres of frontage rarely fit a five or six unit houseplex without compromising unit area. Lots under 30 metres of depth struggle to balance setbacks against meaningful interior space. A 1.5 metre grade change means stepped foundations and complicated servicing.
Existing structure determines the conversion math. A 1950s bungalow with low ceilings rarely converts into a code-compliant fourplex without partial demolition. A 1920s two-storey with brick bearing walls and 9-foot ceilings often does, if the foundation can take the new loads. Toronto’s multiplex architecture lives in the gap between the bylaw and the lot.
In the nine wards covering Toronto and East York District plus Ward 23 in Scarborough North. The remaining 16 wards permit a maximum of four units. The City of Toronto’s Multiplex Housing maintains the current ward list and the underlying bylaw documents.
Yes. The CMHC Housing Design Catalogue publishes region-specific multiplex plans, including fourplexes and sixplexes for Ontario. The drawings are near-permit-ready and free to use, with Toronto among the partner cities pre-reviewing them.
A new-build fourplex typically runs 10 to 14 months of construction, plus 3 to 6 months of design and permitting. Conversions of existing homes run shorter, 4 to 8 months of construction, depending on the existing structure.
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