# Multiplex Construction Central Toronto | Multiplex Toronto Builders

URL: https://multiplextorontobuilders.ca/service-areas/central-toronto/

![Victorian brick houses and a new fourplex on a tree-lined Leslieville street](/images/misc/row-of-restored-victorian-brick-houses-and-a-new-f.webp)

City of Toronto - EHON Zoning

# Multiplex Construction in Central Toronto for Heritage Homeowners and Infill Investors

Last updated: October 21, 2026

Fourplexes, approved-zone sixplexes and heritage conversions on the narrow Victorian and Edwardian lots of the old City of Toronto, from Riverdale and Leslieville to High Park and The Junction.

Zoning

Toronto EHON applies

Unit limit

Up to 6 units (Toronto and East York District)

Response

Written feasibility in 1-2 weeks

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## Request a Written Feasibility Report

Zoning check + CAD estimate before any deposit.

Thanks, we got your project details.

We reply within one business day to book your feasibility review.

Local Overview

## Building Multiplexes Inside the Old City

Multiplex Toronto Builders

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 plans and builds multiplexes across Central Toronto, from Riverdale, Leslieville and Danforth Village to High Park, The Junction, Roncesvalles, Little Italy, Harbord Village and the Annex. These are some of the most valuable infill lots in the country, and some of the hardest to build on: 25-foot Victorian row lots, Heritage Register overlays, shared lanes and mature street trees. Every project runs through the Toronto and East York Committee of Adjustment panel, Toronto Building, Toronto Water and Toronto Hydro, with zoning verified through GeoWarehouse before any design deposit.

Local buyers tend to fall into two groups. Long-time owners of Victorian and Edwardian houses want to turn one house into three or four homes, often keeping the facade the street has known for a century. Infill investors buy older houses near the TTC Line 2 corridor and Queen Street to rebuild as 

fourplexes

[/fourplex-construction/ →](/fourplex-construction/)

, and, inside the Toronto and East York District, 

sixplexes

[/sixplex-construction/ →](/sixplex-construction/)

 where the lot can carry a Part 3 building. Both need the same thing first: an honest answer on what the lot can legally hold.

Budgets here run from about $250K for a 

two-unit heritage conversion

[/multiplex-conversion/ →](/multiplex-conversion/)

 to $1.4M for a fourplex and up to $2M for a sixplex. Our Leslieville fourplex on a standard 25x120 lot came in at $1.08M, including a side-yard variance, and took 11 months from feasibility to occupancy.

Zoning framework: **Zoning By-law 569-2013 + EHON (2023 fourplex, 2025 sixplex amendment)**. Sixplex status: Yes, inside the Toronto and East York District (parcel verified in writing). Lakeshore note: 316 stainless fasteners where within 500 m of Lake Ontario.

Avoid Costly Mistakes

## Multiplex Problems in Central Toronto, Solved Before Design

The local issue that catches owners out most often, then the four problems we see on most lots here, and how we handle each before you spend on design.

The Local Issue

### A Victorian Shell That Has to Keep Its Street Face

What you see

You own an 1890s brick row house in Riverdale or Leslieville and want four or six homes inside it, but every plan you see adds a big rear box and a wider stair.

Why it happens here

Much of the old city was built as Victorian and Edwardian workers' housing, many houses sit on the Heritage Register, and the 2025 sixplex permission does not widen a 25-foot lot.

What we do

Our multiplex conversion team maps heritage status and setbacks first, then plans the units inside the existing brick shell with a modest rear addition the panel can accept.

### Heritage Overlay on Victorian Facades

Many Riverdale, Leslieville and Cabbagetown houses are listed or designated on the Toronto Heritage Register. Heritage Preservation Services must sign off on facade, window and roofline changes before the permit can issue.

Our fix: We keep the street face intact and create units through interior reconfiguration, side entrances and modest rear additions.

### EHON Setback Math on 25-Foot Lots

On a 25x120 lot, side-yard setbacks and rear-yard soft landscaping often leave room for two or three good units without a variance, not four.

Our fix: We model three units with no variance against four with a side-yard variance and show you the cost and time of each.

### Parking Variance Near Transit

Downtown lots near the TTC often qualify for reduced parking, but not every zone does. Without the reduction, a parking variance adds 4-6 months.

Our fix: We check the parking standard at feasibility and, if needed, file the variance at the start of design.

### Sixplex Permission Needs a Parcel Check

The old city sits in the Toronto and East York District, where six units are allowed, but fit, Part 3 costs and heritage status still decide whether a sixplex works.

Our fix: We confirm the district in writing and price sprinklers and a second exit before any sixplex design.

Services

## Old-City Conversions, Fourplexes and Sixplexes

Every service we offer is available here, with the ones local owners need most listed first. Where local rules differ from Toronto's EHON, we design to the local by-law.

### Multiplex Conversion

Existing Victorians, semis and bungalows reworked into 2-4 legal self-contained units, with underpinning, fire separation and separate meters planned up front.

$250K-$900K

View multiplex conversion

[Multiplex Conversion →](/multiplex-conversion/)

### Sixplex Construction

Six-unit builds only in the 2025 approved zones: Toronto and East York District and Scarborough Ward 23 North, with Part 3 scope priced up front.

$800K-$2M

View sixplex construction

[Sixplex Construction →](/sixplex-construction/)

### Feasibility Assessment

Written report in 1-2 weeks: GeoWarehouse zoning pull, unit-count test, servicing check, heritage and tree screen and a CAD budget range.

$1,500-$4,500

View feasibility assessment

[Feasibility Assessment →](/multiplex-feasibility-assessment/)

### Multiplex Construction

Ground-up triplex, fourplex and approved-zone sixplex builds on Toronto infill lots, scoped to OBC Part 9 or Part 3 by unit count and height.

$400K-$2M

View multiplex construction

[Multiplex Construction →](/multiplex-construction/)

### Fourplex Construction

Four-unit new builds, as-of-right citywide under EHON, on standard, corner and narrow Toronto lots with separate hydro and HRV per unit.

$500K-$1.4M

View fourplex construction

[Fourplex Construction →](/fourplex-construction/)

### Triplex Construction

Three-unit new builds for narrow lots and multigenerational families: basement, main and upper units with separate entrances and fewer variances.

$400K-$1.1M

View triplex construction

[Triplex Construction →](/triplex-construction/)

### Multiplex Additions

Rear, side and storey additions that create or enlarge units, with structural tie-in and a foundation check before design.

$180K-$600K

View multiplex additions

[Multiplex Additions →](/multiplex-additions/)

### Design-Build

Feasibility, stamped design, permits and construction under one contract and one PM, priced as it is drawn and fixed after feasibility.

$50K-$150K

View design-build

[Design-Build →](/multiplex-design-build/)

### Architectural Design

Concept, zoning review, BCIN or OAA stamped permit drawings, structural and MEP coordination and SB-12 energy compliance.

$15K-$60K

View architectural design

[Architectural Design →](/multiplex-architectural-design/)

### Building Permits

Zoning certificates, permit applications, CoA minor variances with hearing representation, utility and right-of-way permits, and inspections.

$5,000-$18K

View building permits

[Building Permits →](/multiplex-building-permits/)

Published CAD Pricing

## How Much Does a Multiplex Cost in Central Toronto?

Published price bands for Toronto multiplex work. Sixplex pricing applies only in the Toronto and East York District wards and Ward 23 Scarborough North.

| Unit Type | Price (CAD) | Project | Timeline |
| --- | --- | --- | --- |
| Triplex New Build | $400K-$1.1M | 3 units, Part 9 | 8-10 months |
| Fourplex New Build | $500K-$1.4M | 4 units, as-of-right citywide | 9-12 months |
| Sixplex (Approved Zones) | $800K-$2M | 6 units, Part 3 likely | 12-16 months |
| House-to-Multiplex Conversion | $250K-$900K | 2-4 units in existing house | 6-9 months |
| Architectural Design (Stamped) | $15K-$60K | Permit drawing set | 6-10 weeks |
| Permit Coordination | $5K-$18K | Toronto Building + CoA | 9-14 weeks |
| Feasibility Assessment | $1,500-$4,500 | Written zoning + budget report | 1-2 weeks |

Fixed pricing is issued after a written feasibility report. Luxury finishes add $80-$150 per sqft.

Execution Roadmap

## How a Heritage-Lot Multiplex Moves From Idea to Occupancy

1.  1
    
    ### Step 1: Zoning Verification & Feasibility
    
    GeoWarehouse parcel pull, zoning permissions, setback and coverage math, servicing screen and a written CAD budget range in 1-2 weeks.
    
2.  2
    
    ### Step 2: Architectural Design & CoA Coordination
    
    BCIN or OAA stamped drawings that make the most of rentable area, energy compliance, and a Committee of Adjustment filing only if it pays off.
    
3.  3
    
    ### Step 3: Permit Approvals & Pre-Construction
    
    Building permit, water and hydro applications filed in parallel, and Tarion enrolment for new homes before we break ground.
    
4.  4
    
    ### Step 4: Construction Delivery & Occupancy
    
    Fixed-price construction, inspections booked and passed, separate systems per unit and a first-visit occupancy pass.
    

## Ready to Test Your Victorian Lot?

Zoning check, honest unit count and a CAD budget range in 1-2 weeks, before any deposit. No obligation to build with us.

Get a Written Feasibility Assessment

[#location-form →](#location-form)

What We Build Here

## What We Build on Narrow Old-City Lots

### Victorian and Edwardian Conversions

Tall ceilings, solid brick and deep lots make many old-city houses excellent triplexes. We underpin or bench-foot basements for legal height, build 45-minute or 1-hour fire separations with STC 50+ sound assemblies, and upgrade to a Toronto Hydro meter bank and a 25mm or 38mm Toronto Water lateral.

### Narrow-Lot Fourplexes

Stacked layouts on 25 and 30 foot lots, with one unit per floor and stairs planned to give back floor area. When the fourth unit needs a side-yard variance, we file it with the Toronto and East York panel and represent you at the hearing.

### Laneway and Garden Suites

Many local blocks have public lanes. A laneway suite at the back can add a unit without squeezing the main building, under the city's Changing Lanes permissions.

### Approved-Zone Sixplexes

Inside the Toronto and East York District, we design Part 3 sixplexes with an OAA architect, sprinklers, a second exit and bike storage, and confirm the parcel before you spend on design.

Lot Types

## The Four Lot Types We See Most

What each lot type usually supports, so you can place your own property before the feasibility visit.

1.  1
    
    ### 25x120 Victorian Row Lot
    
    The classic Leslieville and Riverdale lot. Usually a strong triplex; a fourplex often needs a side-yard variance. Heritage status checked first.
    
2.  2
    
    ### 30-35 Foot Semi-Detached Lot
    
    Shared wall with the neighbour, so underpinning needs engineering and notice. Good fourplex candidate when rebuilt; good triplex when converted.
    
3.  3
    
    ### Laneway-Access Lot
    
    A public lane at the rear opens a laneway suite as an extra unit and gives a second route for servicing and access.
    
4.  4
    
    ### Corner Lot With Flankage
    
    Two street faces for entrances and windows. Watch the flankage setback and sight triangle. Often the best sixplex candidates in the district.
    

Recent Local Project

## Leslieville Fourplex New Build

A 4-unit new build on a standard 25'x120' Leslieville lot: $1.08M, 11 months from feasibility to occupancy, with a Committee of Adjustment side-yard variance and four self-contained two-bedroom units, each with separate hydro and an HRV.

Read the Project

[/projects/leslieville-fourplex/ →](/projects/leslieville-fourplex/)

Client Feedback

## What Local Owners Say

> "We were sure our Riverdale semi could only ever be a duplex. The feasibility showed a triplex with a lowered basement, and the separations between floors are so quiet our tenants comment on it."

Imran J., Riverdale

> "Laneway behind our High Park house turned out to be the key. Triplex in the main house plus a laneway suite, four homes on one lot without a single variance."

Rebecca T., High Park

> "Heritage listed house in Harbord Village. They kept the porch and front windows exactly as they were and got HPS sign off on the rear addition first try."

Andrew K., Harbord Village

Before You Design

## Planning an Old-City Multiplex: What to Check First

Start with three questions: is the house on the Heritage Register, how wide is the lot after side-yard setbacks, and is there a public lane at the back? Those three answers shape almost every local project. A listed Victorian on a 25-foot lot with a lane is a very different job from an unlisted semi on a 32-foot lot with no lane, even on the same street.

Next, decide whether you are converting or rebuilding. The old city has a high share of solid brick houses with good bones, tall ceilings and deep lots, which often makes conversion the better route. Where the existing house is small, badly altered or structurally tired, a purpose-built triplex or fourplex can deliver more and better space for the money.

If six units are on your mind, test the sixplex honestly. The Toronto and East York District allows them, but a narrow lot rarely has room for a second exit, bike storage and six livable units. Wider and corner lots are better candidates, and the Part 3 costs need to be in the first number you see.

Plan for the Toronto and East York Committee of Adjustment panel early. Side-yard and parking variances are common on old-city lots, and filing at the start of design lets the hearing run alongside drawings. Neighbours on these streets are close and engaged, so early conversations help.

Finally, think about the lake. Lots near Lake Ontario, especially in the south-east and south-west of the old city, should use 316 stainless fasteners within 500 metres of the shoreline. It is a small line item that prevents corrosion problems years later.

Local Knowledge

## Why Narrow Old-City Lots Need a Specific Approach

Building in the old city means working inside tight constraints. Lots are narrow, neighbours are close, and streets like **Queen Street East**, **Danforth Avenue** and **Dundas Street West** limit where trucks can stage. We plan excavation, shoring and deliveries around those streets, and use lanes where we can.

Approvals run through the **Toronto and East York Committee of Adjustment panel**, which hears more multiplex variances than any other. Knowing what that panel looks for, and preparing neighbour notice packages early, is a big part of keeping projects on time.

### The Housing Stock We Work With

Most local multiplexes start from **Victorian row houses**, **Edwardian semis** and **bay-and-gable** homes on lots of about 25 feet by 100-130 feet. Many sit near **TTC Line 2 Danforth** stations or the Queen and King streetcars, which can reduce parking requirements. Heritage listings are common in Riverdale, Leslieville, Cabbagetown and parts of the Annex. Near the lake, we specify **316 stainless fasteners** within 500 metres of the shoreline.

![New three-storey multiplex on a narrow Riverdale lot between bay-and-gable houses](/images/misc/narrow-25-foot-riverdale-lot-with-a-new-three-stor.webp)

New three-storey multiplex on a narrow Riverdale lot between bay-and-gable houses

Coverage

## Neighbourhoods We Cover in Central Toronto

-   Riverdale
-   Leslieville
-   Danforth Village
-   High Park
-   The Junction
-   Harbord Village
-   Roncesvalles
-   Little Italy
-   The Annex

Postal codes (FSAs) we cover: M4K, M4M, M5R, M5S, M6P, M6R

Local Landmarks

## Landmarks and Transit Near Our Projects

-   Riverdale Park East
-   Withrow Park
-   High Park
-   Queen Street East in Leslieville
-   Dundas Street West in The Junction

Reached via the Gardiner Expressway and Don Valley Parkway, with TTC Line 2 under Bloor and Danforth and streetcars on Queen and King.

### Nearby Service Areas

Multiplex construction in East York

[/service-areas/east-york/ →](/service-areas/east-york/)

Multiplex construction in York

[/service-areas/york/ →](/service-areas/york/)

Multiplex construction in North York

[/service-areas/north-york/ →](/service-areas/north-york/)

Local Questions

## Central Toronto Multiplex Questions Answered

### Can I build a sixplex in Central Toronto?

Yes, in most of it. Council's 2025 amendment allows up to six units in the eight Toronto and East York wards, which cover Riverdale, Leslieville, the Annex and High Park. Whether six fit depends on lot size, a second exit, sprinklers and heritage status, so we confirm your parcel in writing before any sixplex design.

### How many units fit on a 25-foot Leslieville lot?

Often three without a variance. Four is possible with a side-yard variance, as on our Leslieville fourplex, which cost $1.08M and took 11 months from feasibility to occupancy.

### My house is on the Heritage Register. Can it become a multiplex?

Often, yes. Heritage Preservation Services reviews facade and exterior changes, but interior conversion into units usually proceeds. We plan new entrances at the side or rear to protect the street face.

### Do I need parking for a downtown fourplex?

Many lots near the TTC need little or no parking, but it depends on the zone. We check at feasibility and, if a parking variance is needed, file it with the Toronto and East York panel early.

### Can I add a laneway suite to my multiplex?

If your lot backs onto a public lane and has enough depth, a laneway suite can add a unit. Fire access, servicing and tree protection all need to work, and we test them together.

### How long do old-city permits take?

About 9-14 weeks for permit coordination with a clean submission. Heritage Register review or a Committee of Adjustment variance adds time, so we start both early.

### Also Serving 20 Near-GTA Municipalities

Outside our 12 core areas we take on feasibility, design and build work in these municipalities. Each runs its own zoning and additional unit rules, and Toronto EHON does not apply in any of them.

-   Oakville
-   Burlington
-   Milton
-   Halton Hills
-   Caledon
-   King Township
-   Aurora
-   Newmarket
-   Whitchurch-Stouffville
-   East Gwillimbury
-   Georgina
-   Uxbridge
-   Ajax
-   Whitby
-   Oshawa
-   Clarington
-   Scugog
-   Bradford West Gwillimbury
-   New Tecumseth
-   Hamilton

![](/images/misc/warm-morning-view-of-a-finished-brick-and-oak-mult.webp)

Start With Certainty

## Find Out What Your Central Toronto Lot Can Carry

Send the address and we will confirm the zoning, the realistic unit count and a CAD budget range for your property in writing.

Get a Written Feasibility Assessment

[/contact/ →](/contact/)

 

All Service Areas

[/service-areas/ →](/service-areas/)

-   Written zoning verification
-   CAD price bands before deposit
-   Licensed Ontario Builder, Insured & Bonded