Schedule a Meeting

Multiplex Residential Construction in Toronto & the GTA

Build a Duplex, Triplex, Fourplex, Fiveplex, or Sixplex with Toronto's Trusted Multiplex Construction Experts

As Toronto faces a growing housing shortage, multiplex homes have become the leading solution for gentle densification across the city. Urban Infrastructure Group Inc. delivers complete design-build multiplex construction services throughout Toronto and the Greater Toronto Area — fully zoning-compliant, energy-efficient, and built to maximize your investment.

Whether you are a homeowner looking to generate rental income, an investor building a residential portfolio, or a family planning a multi-generational home, we bring the expertise, regulatory knowledge, and construction capability to bring your multiplex project to life.

EMAIL US NOW
multiplex residential construction
Multiplex Home in Toronto

What Is a Multiplex Home in Toronto?

A multiplex is a residential building containing multiple self-contained units, typically between two and six units all under one roof. Each unit includes its own kitchen, bathroom, and private entrance, providing fully independent living spaces within a single structure.

Under Toronto’s Zoning By-Law, at least one dwelling unit must be entirely or partially above another to qualify as a multiplex. Units built side-by-side are typically classified as townhouses or semi-detached homes and are subject to different zoning standards. Multiplex homes are generally low-rise structures that closely resemble large single family houses from the street, making them well-suited for infill development in established low-density neighbourhoods

Depending on the number of units, multiplexes are commonly referred to as:

Duplex — Two self-contained residential units within a single structure. Ideal for owner- occupancy combined with rental income, or for multi generational family living.

Triplex — Three fully independent units on a single residential lot. A highly efficient use of land with strong income potential in Toronto’s rental market.

Fourplex — Four units in one structure. Permitted as-of-right across all residential zones in Toronto and the highest-return build type available on a standard lot.

Fiveplex & Sixplex— Five or six self-contained units within a single low-rise structure. As-of-right permissions for fiveplexes and sixplexes have been expanded to select areas — including the Toronto &  East York District and Ward 23 (Scarborough North) — following 2025 amendments under the EHON initiative and the federal Housing Accelerator Fund. Citywide expansion remains under active study for 2026.

Multiplex vs. Apartment: What's the Difference?

A multiplex contains up to six units within a single low-rise structure, typically owner managed. Apartment buildings are larger multi-unit structures, generally exceeding six units — subject to different zoning classifications, development charges, and ownership arrangements such as condominium corporations or institutional landlords. In Toronto's housing policy, the multiplex category refers specifically to residential structures with six or fewer units, distinct from apartments and commercial mixed-use developments.

Multiplex Zoning in Toronto: 2023–2025 Updates and What They Mean for Your Project

Since 2023, Toronto has undergone transformative zoning reforms to address its housing shortage through gentle densification. The landmark July 2023 changes introduced as-of-right permissions for up to four residential units on most residential lots, eliminating the need for rezoning or variances in the majority of cases. These foundational rules remain fully in effect and have driven a surge in multiplex permits — with hundreds issued annually and growing.

In 2025, the City built further on this momentum under the Expanding Housing Options in Neighbourhoods (EHON) initiative and the federal Housing Accelerator Fund agreement. Key updates include:

Expanded Unit Permissions

As-of-right zoning now allows up to six units (fiveplexes and sixplexes) in detached residential buildings in select areas, including the Toronto & East York District and Ward 23 (Scarborough North), following Official Plan and Zoning By-law Amendments approved in June 2025 (e.g., By-laws 653-2025/654-2025). Citywide expansion to six units in all low-rise residential neighbourhoods remains under active study through the Multiplex Monitoring Program, with potential further rollouts in 2026.

Development Charges Waived

Development charges are fully waived for multiplexes with up to six units per lot — extended from the original four-unit cap — significantly reducing costs for new builds, conversions, and combinations with laneway or garden suites.

No Parking Minimums

Parking requirements remain eliminated for multiplex developments, freeing up land for livable space — especially beneficial in transit- rich neighbourhoods.

Height and Design Flexibility

Flexibility: Multiplexes, including six-unit builds, can reach up to 10–12 metres (typically up to four storeys) in permitted zones, with defined standards for setbacks, landscaping, and bedroom caps to support family-sized units.

Broader Applicability

Applicability: These rules apply to R, RD, RS, RM, and RT zoning districts. In areas where six-unit as-of-right permission has not yet been extended, the four-unit cap still applies, though additional wards may opt in through future motions.

These changes simplify the development process, reduce timelines and costs, and reflect Toronto’s commitment to “missing middle” housing — allowing established neighbourhoods to add supply gradually while preserving their character. For homeowners, investors, and builders, this creates unprecedented opportunity: higher- yield properties, waived fees, faster approvals (often 10–21 days for standard permits under streamlined processes), and strong ROI in one of Canada’s most competitive rental markets.

Urban Infrastructure Group stays ahead of these evolving regulations. We conduct detailed feasibility assessments considering your property’s exact zoning, ward location, and the latest monitoring updates to ensure full compliance and optimal design.

Note: Zoning details can vary by specific lot and ward. Always verify against the City of Toronto’s current Zoning By-law and consult a qualified professional for site-specific advice. Contact us for a no-obligation review of your property under the latest 2025–2026 rules.

Urban Infrastructure Group Inc

Our Multiplex Construction Services in Toronto & the GTA

Urban Infrastructure Group provides full design-build services for every type of multi-unit residential project, from two-unit duplexes to investment-grade sixplexes and infill developments. Every project begins with a detailed feasibility study, architectural planning, and a construction schedule aligned to your zoning classification, lot size, and investment objectives.

Duplex Construction

Ideal for homeowners seeking additional rental income or multi-generational living. Our duplexes are designed for maximum functionality, sound separation, and long-term value in Toronto's residential neighbourhoods.

Triplex Construction

Three self-contained units within a single residential structure — an efficient and highly profitable use of a Toronto or GTA lot. We handle full design, engineering, and construction with zoning compliance built in from the start.

Fourplex Construction

Permitted as-of-right across all residential zones in Toronto and the highest-density build type available on a standard lot. Our fourplex projects are designed for strong rental yields and long-term capital appreciation.

Fiveplex & Sixplex Construction

In eligible areas under Toronto's 2025 zoning amendments, we design and build fiveplexes and sixplexes that maximize your lot's income potential — with development charges fully waived and no parking minimums.

Multiplex Conversion — Single-Family to Multi-Unit

Transform an existing single-family home into a legal duplex, triplex, fourplex, or larger multiplex. We manage everything from initial design and building permits through to structural modifications, mechanical systems, and full code compliance.

Infill Housing Construction

Turn underutilized residential lots into modern, income-generating multi-unit properties. Our infill expertise delivers well-designed homes that integrate seamlessly into established Toronto and GTA neighbourhoods while meeting all municipal planning requirements.

Investment Property Builds

ROI-focused construction for investors building rental portfolios across Toronto and the GTA. We deliver durable, low-maintenance multiplex properties with premium finishes that attract reliable, long-term tenants.

fourplex

Converting a Single-Family Home into a Multiplex in Toronto

Toronto's 2023 zoning amendments make it possible to convert virtually any residential property into a legal duplex, triplex, or fourplex — and in many areas, a fiveplex or sixplex. Many homeowners and investors are choosing conversion as a cost-effective path to increasing both cash flow and property value.

Key Zoning By-Law Amendments That Enable Conversion

  • Multiplex building types now permitted as-of-right in all RD, RS, and RT zones
  • Building depth, side yard setbacks, and main wall height regulations aligned across all residential building types
  • Multiplexes excluded from Floor Space Index (FSI) regulations, simplifying design
  • "U" values amended to permit up to four units (and up to six in eligible areas) in residential zones
  • Multiplexes excluded from "ST" values that specify maximum number of storeys

Why Convert a Single-Family Home to a Multiplex?

Increased Cash Flow 

Multiple rental units on a single lot generate substantially more income than a single tenanted property. A fourplex on a standard Toronto lot can produce income equivalent to several single-family rentals.

Higher Property Value 

Multifamily properties consistently command a premium over comparable single-family homes in Toronto's resale market. A conversion investment typically yields a strong uplift in both assessed and market value.

Live and Rent Strategy 

Owner-occupants can live in one unit while rental income from the remaining units offsets the mortgage, reduces carrying costs, or builds long- term equity.

Gentle Densification 

Contributing new housing supply to an established neighbourhood without altering its streetscape or character is one of the most socially responsible forms of residential development in Toronto today.

MULTIPLEX RESIDENTIAL CONSTRUCTION TORONTO
  • Our Process

The Multiplex Construction Process

Urban Infrastructure Group follows a structured, transparent process designed to deliver clarity and efficiency at every stage.

Initial Consultation & Feasibility Study
We assess your property's zoning classification, lot dimensions, existing structure, and development potential to identify the optimal multiplex configuration — including fiveplex/sixplex eligibility where applicable — and confirm as-of-right status.
Step 1
Design & Architectural Planning
Our designers create functional, modern multiplex layouts fully tailored to your lot, budget, and investment goals — compliant with Toronto's Zoning By-Law, the Ontario Building Code, and all applicable municipal bylaws.
Step 2
Permitting & Approvals
We prepare and submit all building permit applications, site plans, and engineering documentation to the City of Toronto or the relevant GTA municipality on your behalf.
Step 3
Construction
Our licensed contractors manage all trades — including framing, plumbing, electrical, HVAC, fire separation, and finishes — to deliver a fully code-compliant multi-unit residential building on schedule.
Step 4
Quality Inspection & Handover
Each multiplex is thoroughly inspected for safety, structural integrity, and full code compliance before handover. Every unit is delivered ready to occupy or rent immediately.
Step 5

Multiplex Construction Costs in Toronto & the GTA

Construction costs vary depending on lot conditions, number of units, design complexity, and material selections. As a general guide:

  • Duplex construction — Typically ranges from $325 to $400 per square foot
  • Triplex construction — Typically ranges from $325 to $425 per square foot
  • Fourplex and multi-unit developments — Varies based on zoning, shared systems, design scope, and finishes

 

Urban Infrastructure Group provides transparent, detailed cost estimates and cost- efficient construction strategies without compromising quality or regulatory compliance. Contact us for a project-specific feasibility assessment and pricing.

multiplex residential construction
Areas We Serve for Multiplex Construction

Urban Infrastructure Group delivers expert multiplex construction services throughout Toronto and the Greater Toronto Area. Our team has in-depth knowledge of the zoning bylaws, permit requirements, and local market conditions across every municipality we serve.

  • Toronto — Downtown Toronto, East York, North York, Etobicoke, Scarborough, York
  • Peel Region — Mississauga, Brampton
  • York Region — Vaughan, Markham, Richmond Hill, Thornhill, Aurora, Newmarket
  • Halton Region — Oakville, Burlington, Milton
  • Durham Region — Pickering, Ajax, Whitby, Oshawa
  • Hamilton-Wentworth Region — Hamilton, Ancaster, Dundas, Stoney Creek, Flamborough, and Glanbrook
Schedule A Booking
Urban Infrastructure Group Inc
Ready to Build or Convert Your Multiplex in Toronto & the GTA?

Toronto’s zoning evolution — from the 2023 four-unit as-of-right permissions to the 2025 expansions enabling fiveplexes and sixplexes in key districts — has created one of the strongest windows for multiplex investment in years. With development charges waived up to six units, no parking minimums, and streamlined approvals in eligible areas, now is the ideal time to transform your property into a high-yield duplex, triplex, fourplex, fiveplex, or sixplex. Whether you’re a homeowner seeking passive rental income, an investor building a residential portfolio, or a family planning multi-generational living, Urban Infrastructure Group Delivers:

  • Full design-build expertise — from initial feasibility study and custom architectural plans to permitting, construction, and final handover
  • Guaranteed zoning compliance — we navigate the latest EHON updates, Official Plan/Zoning By-law Amendments (including By-law 654-2025), and ward- specific rules to maximize your unit count and ROI
  • Proven results — energy-efficient, low-maintenance builds with premium finishes that attract quality tenants and command premium resale values
  • Transparent pricing & timelines — detailed estimates, cost-efficient strategies, and realistic schedules (typically 8–14 months from permit to completion)

 

Take the first step with zero risk: Contact Urban Infrastructure Group today for a FREE property feasibility assessment. We’ll review your lot’s zoning, confirm fiveplex/sixplex eligibility if applicable, outline the optimal configuration for maximum returns, and provide a no-obligation cost and timeline overview.

Frequently Asked Questions About Multiplex Construction in Toronto & the GTA

What is multiplex construction?

Multiplex construction involves building multi-unit residential properties — including duplexes, triplexes, fourplexes, fiveplexes, and sixplexes — within a single structure on a residential lot. Each unit is fully self-contained with its own kitchen, bathroom, and private entrance.

Is multiplex construction allowed in all Toronto neighbourhoods?

Yes. Since July 2023, Toronto permits up to four residential units as-of-right on any residentially zoned lot — including R, RD, RS, RM, and RT zones — with no rezoning, variance, or Committee of Adjustment hearing required. In select areas such as the Toronto & East York District and Ward 23 (Scarborough North), as-of-right permissions now extend to six units following 2025 zoning amendments.

Do I need a building permit for a multiplex in Toronto?

Yes. All multiplex construction projects require a building permit from the City of Toronto. Urban Infrastructure Group manages the complete permitting and approvals process on your behalf.

Are development charges waived for multiplex construction in Toronto?

Yes. Development charges are fully waived for multiplex projects with up to six units in Toronto — extended from the original four-unit cap under the 2025 EHON amendments — significantly reducing overall construction costs.

How long does multiplex construction take in Toronto?

Most duplex and triplex projects take between 8 and 12 months from permit submission to completion, depending on project scope and City permit processing times. Fourplex, fiveplex, and infill projects may take longer. Under streamlined processes, standard permits are often issued within 10–21 days.

What is the difference between a multiplex and an apartment building in Toronto?

A multiplex contains two to six units within a single low-rise structure, typically owner managed. An apartment building exceeds six units and is subject to different zoning classifications, development charges, and ownership structures.

Can I build a fourplex on my existing property in Toronto?

In most cases, yes — provided your property is in an R, RD, RS, RM, or RT zone. Toronto's as-of-right zoning means no rezoning or variance is required. Urban Infrastructure Group will assess your lot to confirm eligibility and design the optimal layout.

Can I build a sixplex in Toronto in 2026?

Yes, in many cases — but it depends on your property's location. Following June 2025 zoning amendments (By-laws 653-2025/654-2025), sixplexes are permitted as-of-right in the Toronto & East York District and Ward 23 (Scarborough North). In other areas, the four-unit cap still applies, though citywide expansion remains under active study. Contact us for a free assessment of your property's eligibility.

How much does it cost to build a multiplex in Toronto?

Duplex and triplex construction typically ranges from $325 to $425 per square foot. Fourplex and multi-unit projects are priced by scope. Urban Infrastructure Group provides transparent, detailed estimates following an initial feasibility review.

Can I convert my single-family home into a multiplex in Toronto?

Yes. Toronto's zoning changes specifically permit the conversion of existing single- family homes into legal duplexes, triplexes, fourplexes, and — in eligible areas — fiveplexes or sixplexes. Urban Infrastructure Group manages the entire process, from design and permitting through to construction and final inspection.

Is multiplex construction a good investment in the GTA?

Multiplex construction is widely regarded as one of the strongest residential investment strategies in the GTA, given the region's persistent rental demand, population growth, and ongoing housing shortage. Multiple units generate substantially more rental income than a single-family property, and multifamily buildings command a premium on resale.

Do GTA municipalities outside Toronto allow multiplex construction?

Many GTA municipalities — including Mississauga, Brampton, Markham, Vaughan, Oakville, and Burlington — permit various forms of multi-unit residential construction. Provincial legislation has further encouraged municipalities across Ontario to update zoning policies to enable additional dwelling units. Urban Infrastructure Group has detailed knowledge of the regulations applicable in each municipality we serve.

Are there parking requirements for multiplexes in Toronto?

No. Toronto eliminated parking minimums for multiplex developments as part of the 2023 zoning by-law amendments — particularly advantageous for properties near transit corridors, where land can be used for additional building space rather than car storage.

Can I customize my multiplex design to match my neighbourhood?

Yes. All Urban Infrastructure Group multiplex designs are fully custom-tailored to your lot dimensions, neighbourhood context, budget, and investment goals. Our architects prioritize streetscape compatibility so that new multiplexes integrate naturally into established residential areas.

What is gentle densification and why does it matter in Toronto?

Gentle densification refers to the incremental increase of housing units in low-rise neighbourhoods through small-scale multi-unit buildings like duplexes, triplexes, and fourplexes. Rather than replacing neighbourhood fabric with towers, it allows communities to grow gradually while preserving their character. Multiplex construction is central to Toronto's strategy for addressing its severe housing shortage.

What zoning districts in Toronto allow multiplex construction?

Multiplex construction is permitted as-of-right in Toronto's R, RD, RS, RM, and RT residential zoning districts, which cover the vast majority of low-rise residential properties across the city.

What is the maximum height for a multiplex in Toronto?

Under the 2023 zoning amendments, multiplexes may be built up to 10 metres in height — and up to 10–12 metres for six-unit buildings in eligible zones — even where previous maximums were lower.

Can a multiplex have separate utility meters for each unit?

Yes. Best practice is to provide each unit with separate heating, electrical, and plumbing systems. This simplifies landlord-tenant arrangements, reduces disputes over utility costs, and is standard practice in every Urban Infrastructure Group build.