Multiplex Toronto BUILDERS Multiplex Toronto Builders 
Multiplex design-build, Toronto EHON permits, HCRA-registered construction FOR Property Investors | Toronto Homeowners | Multigenerational Families | Infill Developers across Toronto, East York, Scarborough, Etobicoke, North York and the GTA.
Multiplex Toronto Builders handles the full range of Toronto multiplex work: multiplex construction, fourplex, triplex and approved-zone sixplex new builds, house-to-multiplex conversions, additions, design-build, architectural design, building permits and feasibility assessments. Work is delivered under HCRA registration and Tarion enrolment, backed by 15+ years of Toronto infill and 40+ projects coordinated. Every lot starts with a GeoWarehouse zoning verification.
In our opinion, most multiplex budgets break on zoning, not lumber. We test EHON lot coverage and the 25-foot setback math, screen Heritage Preservation Services overlays in Riverdale and Leslieville, and plan Committee of Adjustment timelines before design. Tarion is enrolled per project, the OBC Part 9 vs Part 3 call is made at concept, a structural engineer signs off early and your insurer is involved from day one.
The process is simple: zoning verification, a written feasibility report, CAD pricing before any deposit, realistic permit timelines and OBC-grade workmanship. The first consultation is free, and one project manager runs your build from the first site visit to keys.
Our job is a first-visit occupancy inspection pass, rents that hit your projections and a building that holds its mortgage value. That comes from accurate zoning, honest unit counts and Toronto infill delivered on time, so your deposit and your timeline stay protected.
Recent Project Spotlight
Recent Project: 4-unit new build in Leslieville on standard 25'x120' lot, completed in 11 months for $1.08M including CoA variance for side-yard setback, 4 self-contained 2-bed units with separate hydro + HRV. 11 months feasibility to occupancy. See the project
We publish per-sqft pricing before any deposit, so you can plan with real numbers instead of guesses. A fourplex runs $500K-$1.4M, a triplex $400K-$1.1M and an approved-zone sixplex $800K-$2M, which means your written CAD feasibility arrives with zoning verified before any contract.
We work with HCRA-registered builders and enrol every new build with Tarion before site mobilization, so your deposit is protected if construction is ever interrupted. Finished units carry the statutory Tarion 1-2-7 year warranty on top of our written workmanship warranty.
We pull your parcel zoning from GeoWarehouse before design starts, because the cheapest mistake is the one caught first. That means no sixplex pitch where only a fourplex is as-of-right, no EHON math guessed on 25-foot lots and no heritage overlay surprises mid-build.
When a minor variance is needed for parking, side-yard or height, we file the application and represent you at the hearing. We have filed 40+ variance applications across Toronto CoA panels since 2019, so we know what each panel looks for and how long it really takes.
Each unit gets its own hydro meter, separate water shut-off, HRV ventilation and OBC-compliant egress, which means tenants pay their own utilities. We coordinate ESA inspection, Toronto Water upgrades and gas separation before drywall, so occupancy is never held up.
After the written feasibility report, you sign a fixed-price construction contract, not open-ended cost-plus. Structural, envelope, MEP, finishes, landscaping and permits are scoped to the dollar before signing, so your lender and your budget see the same number.
"Pulled zoning for our Leslieville lot before signing, saved us from a sixplex pitch we couldn't actually build. Fourplex at $1.08M in 11 months, as quoted."
"First builder promised sixplex rights that didn't exist in our Etobicoke zone. Redesigned as fourplex, filed CoA, occupancy 11 months."
"Feasibility showed our Scarborough corner lot could do 6 units in Ward 23. Sixplex built on budget, all 6 rented first month."
Zoning check + CAD estimate before any deposit.
Thanks, we got your project details.
We reply within one business day to book your feasibility review.
Toronto zoning and building rules carry hidden friction points. These are the four failure modes we see most, and what we do about each before you spend on design.
The 2025 amendment covers the Toronto and East York District and Scarborough Ward 23 North only. North York, Etobicoke, York and the rest of Scarborough stay at fourplex as-of-right, yet owners there are still pitched six units.
Our fix: Written zoning confirmation tied to your parcel before any architectural deposit.
Riverdale and Leslieville Victorians on the Heritage Register need Heritage Preservation Services sign-off before facade, window or roofline changes. Designs that ignore it stall at permit.
Our fix: Interior reconfiguration and side or rear entrances that keep the street face intact.
A standard 25-foot Danforth Village lot often yields two or three livable units without a variance, not four, once side-yard setbacks and rear-yard soft landscaping are applied.
Our fix: Lot geometry modelled before design, with three units and four units priced side by side.
Transit-proximity parking reductions do not apply on every lot. When they do not, a parking variance adds 4-6 months at the Committee of Adjustment that nobody budgeted.
Our fix: Parking standard checked at feasibility; any variance filed at the start of design.
Ten services under one roof, split into building work and the design and approvals that come before it. Every card shows our published CAD price band.
Build
$400K-$2MGround-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.
View multiplex construction
$500K-$1.4MFour-unit new builds, as-of-right citywide under EHON, on standard, corner and narrow Toronto lots with separate hydro and HRV per unit.
View fourplex construction
$400K-$1.1MThree-unit new builds for narrow lots and multigenerational families: basement, main and upper units with separate entrances and fewer variances.
View triplex construction
$800K-$2MSix-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.
View sixplex construction
$250K-$900KExisting Victorians, semis and bungalows reworked into 2-4 legal self-contained units, with underpinning, fire separation and separate meters planned up front.
View multiplex conversion
$180K-$600KRear, side and storey additions that create or enlarge units, with structural tie-in and a foundation check before design.
View multiplex additionsDesign & Approvals
$50K-$150KFeasibility, stamped design, permits and construction under one contract and one PM, priced as it is drawn and fixed after feasibility.
View design-build
$15K-$60KConcept, zoning review, BCIN or OAA stamped permit drawings, structural and MEP coordination and SB-12 energy compliance.
View architectural design
$5,000-$18KZoning certificates, permit applications, CoA minor variances with hearing representation, utility and right-of-way permits, and inspections.
View building permits
$1,500-$4,500Written report in 1-2 weeks: GeoWarehouse zoning pull, unit-count test, servicing check, heritage and tree screen and a CAD budget range.
View feasibility assessmentThree kinds of owners make up almost all of our work. The rules are the same for each, but the right building is not.
You own a house and want it to earn more or hold more family. We convert existing Victorians, semis and bungalows into two to four legal units, or rebuild when the numbers say so. You get an honest unit count first, then a fixed price.
House-to-multiplex conversion
You want rent streams and a building appraised on income. We build EHON fourplexes citywide and sixplexes in the two approved zones, with separate meters, Toronto Green Standard Tier 1 envelopes and a fixed contract your lender can underwrite.
Fourplex construction
You want parents, adult children and maybe a tenant on one lot, each with their own front door. We design accessible ground units, family-size upper units and separate utilities so every household stays independent and every unit stays rentable later.
Triplex constructionWe publish price bands so investors and owners can test the numbers before calling anyone. The fixed price comes after a written feasibility report.
| 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 |
Per-sqft guide: new build $320-$520/sqft, conversion $220-$380/sqft, luxury finish uplift +$80-$150/sqft.
General contractors often apply single-family habits to multi-unit buildings. These four habits are what we do differently.
Every project starts with a GeoWarehouse parcel pull and a By-law 569-2013 check. We tell you what your lot can legally carry before you spend on design, including the exact sixplex district boundaries and any heritage, tree or ravine limits.
Once the written feasibility report and design scope are settled, you get a fixed-price contract with allowances listed separately. Our Leslieville fourplex came in at the quoted $1.08M. That is the point of doing the homework first.
40+ variance applications across the Toronto and East York, North York, Etobicoke York and Scarborough panels since 2019. We file early, prepare neighbour notice properly and sit beside you at the hearing.
Separate hydro meters, water shut-offs, heat pumps and HRVs for every unit, plus interconnected alarms and egress for every bedroom. Utility upgrades are filed at permit stage, so finished units do not sit empty waiting for power.
From the first GeoWarehouse parcel check to the final occupancy sign-off.
GeoWarehouse parcel pull, By-law 569-2013 permissions, setback and coverage math, a heritage, tree and servicing screen and a written CAD feasibility in 1-2 weeks.
BCIN or OAA stamped drawings with rentable area optimized, Toronto Green Standard Tier 1 built in, and a variance filed only when it clearly pays.
Toronto Building, Toronto Water and Toronto Hydro applications filed together, and Tarion enrolment completed before ground is broken.
Founder Michael Chen leads our trade specialists through site mobilization, structural framing, multi-unit MEP and a first-visit occupancy inspection pass.
A multiplex is not always the answer. Here is how the five common routes compare for a Toronto lot, so you can see where each one fits.
| Option | Units Gained | Typical CAD Cost | Approval Path | Timeline | Rental Income Potential |
|---|---|---|---|---|---|
| Multiplex (3-6 units) | +2 to +5 | $400K-$2M | Building permit; EHON as-of-right in Toronto (6 units in 2 zones) | 8-16 months build | Highest: several full rent streams |
| Addition | +1 or larger unit | $180K-$600K | Building permit; variance if setbacks are tight | 5-8 months | Moderate |
| Secondary Suite | +1 | Lower; varies with basement work | Building permit; basement height and egress rules | 3-6 months typical | Modest, one rent stream |
| Laneway / Garden Suite | +1 | Varies with servicing and size | Garden or laneway suite permissions; fire access | 6-9 months typical | Modest to moderate |
| New Custom Home | 0 | Varies widely | Building permit | 10-14 months typical | None (owner-occupied) |
Not sure which fits your lot? Our guides on converting vs rebuilding and fourplex plus garden suite go deeper.
Zoning check, honest unit count and a CAD budget range in 1-2 weeks. No obligation to build with us.
First name, last initial and neighbourhood only. Every quote here appears on this page alone.
"Our Victorian is on the heritage register and two contractors told us to forget it. They kept the front facade, got the HPS sign-off and we now have three units. Around $610K all in."
"Leaside lot, we were weighing a sixplex. They priced the sprinklers and second exit honestly and the fourplex won on our numbers. Glad someone showed us both before we committed."
"Roncesvalles semi, now three units. The underpinning was the scary part and they explained every stage. Final price matched the contract."
"Bungalow in Agincourt rebuilt as a fourplex. One project manager the whole way and a photo update every Friday. No change orders I didnt approve first."
"Feasibility came back in eight days with the setback math drawn out. It was the first time anyone showed us why our lot was a triplex and not a fourplex."
"Long Branch lot near the lake. Stainless fasteners, a garden suite out back and the Hydro upgrade booked at permit stage. Tenants moved in the week of occupancy."
Six City of Toronto districts where EHON applies, and six GTA cities where we design to local additional unit rules.
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.
Victorian and Edwardian row houses on 25-foot lots, many on the Heritage Register. Strong triplexes and careful fourplexes, inside the Toronto and East York District where sixplexes are possible on the right lot. Our Leslieville fourplex delivered four two-bedroom units for $1.08M.
Narrow lots near TTC Line 2 where the EHON setback math decides everything. Three units without a variance often beat four with two variances, and we price both before you choose.
The only part of Scarborough where six units are allowed. Corner lots around Milliken can carry a Part 3 sixplex with a second exit and bike storage. Our Ward 23 North sixplex was fully rented in its first month.
Deep post-war lots that fit a fourplex and often a garden suite. Within 500 metres of the lake, we specify 316 stainless fasteners. Fourplex is the maximum here, whatever a sales pitch says.
Wide 40-50 foot lots that fit four generous units, often side by side, without variances. Mature trees and water service upgrades are the usual items to plan around.
Wartime houses that are often better rebuilt than converted, larger Leaside homes that convert well, and sixplex permission under the Toronto and East York District.
In 2023, Toronto's Expanding Housing Options in Neighbourhoods (EHON) program made fourplexes as-of-right citywide. That means up to four units on residential lots without a rezoning, under Zoning By-law 569-2013.
In 2025, the city allowed sixplexes, but only in two areas: the Toronto and East York District and Scarborough Ward 23 North. Everywhere else, including North York, Etobicoke, York and the rest of Scarborough, four units is the as-of-right maximum.
Permission is not the same as fit. By-law 569-2013 still sets setbacks, height, lot coverage and soft landscaping. On a 25-foot lot, those rules often leave room for two or three good units without a variance, not four. A Committee of Adjustment variance can close the gap, at a cost of 4-6 months.
EHON applies in the City of Toronto only. It does not apply in Vaughan, Markham, Richmond Hill, Mississauga, Brampton or Pickering, where each city runs its own additional unit rules. That is why every project we take on starts with a written zoning check tied to the exact parcel.
Read the full EHON guide or see where sixplexes are allowed.
Three rulebooks every multiplex in Ontario has to satisfy, and how we handle each.
Most triplexes and fourplexes stay within Part 9 (under 600 sq m and three storeys). Most sixplexes cross into Part 3, which brings sprinklers, a second exit and an OAA architect. We set the code path at concept and design to CSA O86, R-24 walls and R-60 roofs.
New homes in Ontario must be built by a builder registered with the Home Construction Regulatory Authority. We name the licensed entity in your contract and share registration details before any deposit. You can check any builder in the HCRA Ontario Builder Directory.
Every new build is enrolled with Tarion before construction starts, with statutory 1-2-7 year coverage: one year for workmanship, two for systems and water penetration, seven for major structural defects. A Tarion pre-delivery inspection closes out every project.
Also built in: Toronto Green Standard Tier 1, R-24 walls and R-60 roofs, and 316 stainless fasteners within 500 metres of Lake Ontario.
| What Matters | Multiplex Specialist (Us) | Typical General Contractor | Typical Design-Build Firm |
|---|---|---|---|
| Zoning verification before deposit | Standard, in writing | Often skipped | Varies by firm |
| EHON and sixplex zone knowledge | Core skill | Often limited | Varies by firm |
| CoA variance filing and representation | In-house, 40+ since 2019 | Usually outsourced | Sometimes in-house |
| Multi-unit MEP and separate metering | Planned from concept | Sometimes missed | Varies by firm |
| Fixed price after feasibility | Yes | Often cost-plus | Often yes |
A triplex runs $400K-$1.1M CAD, a fourplex $500K-$1.4M and a sixplex in approved zones $800K-$2M. Converting an existing house costs $250K-$900K. New builds work out to roughly $320-$520 per sqft, conversions $220-$380 per sqft, before any luxury finish uplift of $80-$150 per sqft. Your lot width, foundation, finish level and whether the building falls under OBC Part 9 or Part 3 move the number inside those bands, which is why we confirm zoning and unit count in a written feasibility report before quoting a fixed price.
No. The 2025 sixplex amendment applies only in the Toronto and East York District and Scarborough Ward 23 North. Everywhere else in the city, fourplex is the as-of-right maximum under EHON, so we verify your parcel before any design work. If a builder pitches six units on a North York, Etobicoke or York lot, ask them to show the zone confirmation in writing.
No. EHON is a City of Toronto zoning change to By-law 569-2013. Vaughan, Markham, Richmond Hill, Mississauga, Brampton and Pickering each run their own additional residential unit or secondary suite rules, which we work within on every GTA project. The unit count, parking and entrance rules can differ a lot from Toronto, so a lot that would carry four units in Leslieville may only carry two or three in York Region or Peel.
Plan on 1-2 weeks for feasibility, 6-10 weeks for design, 9-14 weeks for permit coordination and 9-12 months of construction. A Committee of Adjustment variance adds 4-6 months, which is why we confirm it is needed before design is final. Our Leslieville fourplex went from feasibility to occupancy in 11 months, including a side-yard variance.
Yes, new homes in Ontario must be built by an HCRA-registered builder and enrolled with Tarion per project. Ask for the builder number upfront and a written agreement naming the licensed entity before you pay a deposit. You can check any builder in the HCRA Ontario Builder Directory in a few minutes.
Yes. A multiplex keeps one lot with several units, so no severance is needed. Severance splits a lot into separate parcels, a different process that owners often confuse with multiplex approval. Conversions still need a building permit, fire and sound separation between units and, in most cases, hydro and water service upgrades.
EHON (Expanding Housing Options in Neighbourhoods) is Toronto's program that, since 2023, permits up to four units as-of-right on residential lots citywide, with a 2025 amendment allowing six units in two approved areas. Setbacks, height and lot coverage still decide how many units your lot actually fits, so permission on paper is not the same as fit on the ground.
Yes. We prepare and file minor variance applications for parking, side-yard and height, and represent you at the hearing. We have filed 40+ applications across Toronto CoA panels since 2019. Most variances add 4-6 months, so we only pursue one when it clearly adds a unit or saves real cost.
Often, yes. Heritage Preservation Services must sign off on facade and exterior changes, but interior reconfiguration into units frequently proceeds. Expect added review time in areas like Riverdale and Leslieville, and plan rear additions and new entrances so they stay out of the protected street face where possible.
Book a written feasibility assessment ($1,500-$4,500). We pull your parcel zoning from GeoWarehouse, test the unit count against setbacks and height, screen heritage, trees and servicing, and give you a CAD budget range in 1-2 weeks. You walk away with a report you can take to a lender, even if you decide not to build with us.
More answers in our multiplex guides.
One written report covers zoning, unit count and a CAD budget range, so the next decision is based on numbers, not a sales pitch.
