This guide is general information for educational purposes only. It is not legal, tax or financial advice. Speak with a qualified lawyer, accountant or tax professional about your situation.
Toronto permits fourplexes citywide, subject to zoning, and sixplexes in two mapped areas. How suites, height limits and development charges affect your plans.
This is for luxury buyers, investors and rental owners asking one question: how many homes can I legally put on a Toronto house lot today?
The short answer: up to four units in one building under citywide multiplex zoning, up to six in two defined areas, and potentially one garden or laneway suite on top, if the property and design qualify. Eligible added units pay no City development charges.
The details decide whether a property is a family home with optionality or a small income building. Here is how I read the rules as they stood in September 2026.
First, a definition. "As of right" means you can build without a rezoning or a minor variance (a small exception granted by the Committee of Adjustment), provided the design meets the zoning by-law. You still need a building permit.
Council approved citywide fourplex permissions in May 2023. Today, according to the City's multiplex guidance, you may build a duplex, triplex or fourplex on a lot in the R, RD, RS, RM or RT residential zones, or convert an existing house to two, three or four units.
To count as a multiplex, at least one unit must sit entirely or partially above another. Side-by-side units are generally treated as townhouses or semi-detached houses, with different standards.
Where can you build a sixplex in Toronto?
Six units are not citywide. On June 26, 2025, Council enacted By-law 654-2025, which permits fiveplexes and sixplexes in two areas:
- the lands within the Toronto and East York Community Council boundaries as they existed on June 26, 2025; and
- part of Ward 23 (Scarborough North), generally bounded by Steeles Avenue, Neilson Road and the Rouge River, Highway 401 and Midland Avenue.
The City's multiplex page puts it plainly: four-unit multiplexes are permitted citywide, and six-unit permissions vary by location. I verify every address against the by-law maps before a client relies on it.
Sixplex conditions worth knowing
- The five- or six-unit building must be detached, on one lot, with no connection to a building on the neighbouring lot.
- No part of a semi-detached house or townhouse may be converted into a fiveplex or sixplex.
- Height may rise to 10.5 metres if the bottom of the lowest level's ceiling joists is 1.0 to 1.5 metres above established grade for at least 80% of that level's interior floor area. Floor-to-ceiling height must be at least 2.4 metres for at least 80% of that area, and the level must wholly or partly contain a dwelling unit.
- Within the sixplex overlay, a detached house may retain its lawful existing status when converted to five or six units within its lawful building envelope immediately before the permit is issued, subject to the by-law's conversion conditions. Additions must meet zoning or obtain a minor variance.
Can you add a garden or laneway suite to a multiplex?
Potentially, yes. The City confirms that a garden suite or laneway suite can sit on the same property as a multiplex if the regulations are met. A garden suite is a self-contained home in a separate ancillary building, usually in the rear yard, not on a public lane.
A laneway suite is on a residential property sharing a property line with a public lane.
Key limits for garden suites and laneway suites under the citywide zoning by-law:
- Maximum height of 4.0 metres if the suite is less than 7.5 metres from the house, or 6.3 metres if it is 7.5 metres or more away, with a maximum of two storeys.
- The suite's floor area must be less than the main house. For garden suites, the cap is 120 square metres, or 60 square metres for a one-storey suite.
- Only one ancillary building containing a garden or laneway suite is permitted per lot; you cannot have both. Severing a garden suite onto a separate lot from the main dwelling is not permitted.
One important constraint is firefighter access, which Toronto Building and Toronto Fire assess under the Ontario Building Code. The City notes these requirements cannot be varied through the Committee of Adjustment.
What zoning limits still apply to a multiplex?
Toronto's approach is "more units, same box." You get more homes, not a much larger building. The City's guidance sets out the rules I check first:
- Height: where the height overlay shows less than 10 metres, a multiplex may reach 10 metres. A higher overlay applies as shown. Storey limits on the overlay do not apply.
- Floor space index (FSI, total floor area divided by lot area): the zone's FSI cap does not apply to multiplexes, but a site-specific Chapter 900 exception may still impose one.
- Lot coverage and setbacks: these still apply, as for other residential buildings in the zone.
- Parking: since February 3, 2022, duplexes, triplexes and fourplexes do not need on-site parking.
- Trees: injuring or removing a private tree 30 centimetres or more in diameter generally needs a permit.
The real risk sits in the details. A Chapter 900 exception, a protected tree, or a tight side yard can cut a four-unit plan to three. That is why I ask for a zoning review before a client firms up a purchase priced on unit count.
Do multiplexes pay development charges in Toronto?
Development charges (DCs) are one-time municipal fees on new housing that fund growth infrastructure. For multiplexes, most of them fall away.
Provincially, the Development Charges Act exempts a second and third unit in a new or existing detached house, semi or rowhouse, including one unit in an ancillary building, within set combinations.
Toronto goes further. By-law 845-2025, in effect since July 24, 2025, means DCs are not imposed on the second to fourth units, and are reduced to $0 for the fifth and sixth, where there are no more than six units on the lot.
The corrected parkland exemption covers the second to sixth unit on a residential parcel with no more than six units, or seven where a garden or laneway suite is included.
A garden or laneway suite is left out of the six-unit count if it is under a DC deferral agreement. The City describes that agreement as deferring the suite's charge for up to 20 years, after which it is fully forgiven.
Creating a new lot through consent or subdivision within 20 years of permit issuance triggers payment. Other agreement defaults can also trigger repayment. I ask clients' lawyers to review the registered agreement and any transfer obligations before closing.
What could a $3,500,000 lot actually hold?
Take a hypothetical $3,500,000 detached house on an RD-zoned lot, with laneway access and no restrictive Chapter 900 exception. Compare two locations, assuming all applicable zoning and building requirements are met:
| Rule | Outside sixplex areas | Toronto and East York |
|---|---|---|
| Units in main building | Up to 4 | Up to 6 |
| Plus garden or laneway suite | 1, if rules met | 1, if rules met |
| Main building height | 10 m (if overlay is lower) | 10.5 m if all lower-level tests above are met |
| City DCs on added units | $0 on units 2 to 4 | $0 on units 2 to 6 |
| Laneway suite height | 4.0 m or 6.3 m | 4.0 m or 6.3 m |
For scale, the City's rate schedule effective June 26, 2025 lists $80,690 per non-rental apartment unit with two or more bedrooms. Five such units would total $403,450 before exemptions or other adjustments. This historical comparison is not a charge or saving calculated for the hypothetical multiplex.
On July 30, 2026, Council enacted conditional time-limited DC reductions of 40% to 60%. The reduced amounts require a fully executed transfer payment agreement and qualifying permit milestones. I confirm eligibility and the applicable charge with the City for each project.
The number I underwrite is not the theoretical maximum. It is what a zoning review, the tree survey and fire access allow. Build costs, lost income while the building is under construction, and resale depth for a six-unit asset in that street all matter more than the headline count.
What this means for you
Luxury buyer. If you are buying a detached home in central Toronto, part of its value is optionality: a future fourplex or sixplex, or a garden suite for family. I price that option conservatively, because neighbouring lots may have similar permissions. For the broader trade-off, see my note on the condo-to-freehold spread.
Investor. A sixplex has a financing angle a fourplex does not. CMHC's MLI Select program requires a minimum of five units, so a five- or six-unit building can be eligible for multi-unit insured financing, subject to its criteria. I covered the wider case in the case for multifamily.
Rental owner. Consider a conversion alongside a rebuild, with zoning, building-code compliance and permit requirements assessed before you compare timing and cost. Model rents carefully; I discussed the current supply picture in the rent decline paradox. Ask your accountant how conversion affects your tax position.
Frequently asked questions
Can I build a fourplex anywhere in Toronto?
On lots zoned R, RD, RS, RM or RT, yes, if the design meets the zoning by-law. Properties with site-specific exceptions need a closer look.
Is a sixplex allowed in North York or Etobicoke?
By-law 654-2025 covers the mapped Toronto and East York Community Council area and part of Ward 23. Outside that overlay, the citywide multiplex permission is up to four units in the main building; an existing permission, rezoning or other applicable zoning may allow more.
Do I need parking for a duplex, triplex or fourplex?
No. Since February 3, 2022, duplexes, triplexes and fourplexes do not need on-site parking. If you add parking, it must meet zoning standards.
Can I sever a garden suite and sell it separately?
No. The City does not permit a severance that puts the main house and the garden suite on separate lots.
Sources
- Multiplex Housing, City of Toronto
- Considerations When Building Multiplexes, City of Toronto
- Multiplex Study (2-4 Units), City of Toronto
- By-law 654-2025 (fiveplexes and sixplexes), City of Toronto
- Garden Suites, City of Toronto
- Changing Lanes: Laneway Suites in Toronto, City of Toronto
- Zoning By-law 569-2013, Section 150.7 Garden Suites, City of Toronto
- Zoning By-law 569-2013, Section 150.8 Laneway Suites, City of Toronto
- By-law 845-2025 (development charge and parkland exemptions), City of Toronto
- Mayor's Agenda Item: Making it Easier to Build More Housing (May 12, 2026), City of Toronto
- Development Charge Rates, effective June 26, 2025, City of Toronto
- By-law 1261-2026 (conditional development charge reductions, July 30, 2026), City of Toronto
- By-law 269-2026 (corrected parkland exemption), City of Toronto
- Laneway and Garden Suite Development Charges Deferral Program, City of Toronto
- Development Charges Act, 1997, Government of Ontario
- MLI Select, Canada Mortgage and Housing Corporation