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Framed Toronto multiplex under construction beside a finished fourplex
10 Services, One Team

Multiplex Services in Toronto and the GTA

From the first zoning check to the final occupancy inspection: feasibility, design, permits, Committee of Adjustment variances and construction of triplexes, fourplexes, approved-zone sixplexes, conversions and additions. Every service has a published CAD price band and a fixed price after feasibility.

Build and Design & Approvals

Choose the Service That Fits Your Stage

Build services cover new construction, conversions and additions. Design and approvals cover the work that decides what you are allowed to build. Most owners start with a feasibility assessment.

Build

Finished three-storey brick and oak fourplex on a tree-lined Toronto infill street in morning light$400K-$2M

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.

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New three-storey Toronto fourplex with brick and oak facade and four separate entrances$500K-$1.4M

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.

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Modern Toronto triplex on a narrow infill lot with three stacked units$400K-$1.1M

Triplex Construction

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

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Finished six-unit residential building on a Scarborough corner lot$800K-$2M

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.

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Toronto semi-detached brick house partway through a multiplex conversion with a new side entrance$250K-$900K

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.

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Two-storey rear addition on a Toronto brick house with large casement windows$180K-$600K

Multiplex Additions

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

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Design & Approvals

Architectural drawings on a site table inside a framed Toronto multiplex$50K-$150K

Design-Build

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

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Architect's desk with multiplex floor plans and a scale model under window light$15K-$60K

Architectural Design

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

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Building permit card posted in the window of a Toronto multiplex under construction$5,000-$18K

Building Permits

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

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Typical Toronto residential lot with an older detached house and deep backyard$1,500-$4,500

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.

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Published CAD Pricing

Multiplex Price Bands at a Glance

Construction, design and approvals in one table. Fixed pricing follows a written feasibility report.

Toronto multiplex price bands in CAD
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

Additions: rear $180K-$400K, side $220K-$600K. Design-build fee: $50K-$150K plus construction. Want a quick estimate? Try the multiplex cost calculator.

Execution Roadmap

How Every Service Fits Together

Whether you hire us for one step or all four, the order is the same.

  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. 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. 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. Step 4: Construction Delivery & Occupancy

    Fixed-price construction, inspections booked and passed, separate systems per unit and a first-visit occupancy pass.

Start With Certainty

Not Sure Which Service You Need?

Start with a written feasibility report. It tells you what your lot can carry, which services you need next and roughly what they cost.

Get a Written Feasibility Assessment
  • Written zoning verification
  • CAD price bands before deposit
  • Licensed Ontario Builder, Insured & Bonded
Get Written Feasibility