Multiplex Conversion Toronto in North York

Up to 4 dwelling units within a single primary building (the multiplex) plus optionally 1 additional garden suite or laneway suite for a total of 5 units. This was unlocked by North York City Council in May 2023 (By-law 287-2023) following the provincial Bill 23 mandate. The 5-unit stack play is the canonical setup for CMHC MLI Select financing.

Multiplex up to 4 units is as-of-right across all North York R-zones — no rezoning, no Committee of Adjustment required if the work stays within the existing building envelope. COA is only triggered by additions exceeding zone height/setback or by a 5+ unit project.

CMHC MLI Select is a federal mortgage insurance program for rental properties with 5+ units (in some product variants, 4+). It enables 50-year amortization, 95% loan-to-value, and near-prime interest rates in exchange for affordability, energy-efficiency, or accessibility commitments. For a North York fourplex-plus-garden-suite, MLI Select typically saves $1,800 to $3,500/month in debt service compared to a conventional mortgage.

Plan for 12 to 18 months from first call to last tenant move-in. Design and permit phase is 5 to 7 months (longer if COA or Site Plan triggered). Construction is 6 to 10 months. Inspections and occupancy add 3 to 5 weeks. Projects without addition (existing envelope only) compress to 10 to 12 months.

Acoustic non-compliance is the most common late-stage cost shock. Existing dimensional-lumber floors test at STC 35 to 40; OBC 9.11 mandates STC 50 between dwellings. Properly retrofitting an existing floor-ceiling assembly (resilient channel + Type X + acoustic batt + underlay) can cost $18 to $35 per sq ft. Designing this in from day one is much cheaper than fixing it after drywall.

Not legally required, but strongly recommended. North York Hydro will install separate meters for $1,800 to $4,200 per additional service at conversion time; doing this later requires service interruption and re-permitting. Tenant-billed hydro reduces landlord operating cost variance and is a near-universal expectation in 2026 leases.

Yes, but the property must be rewritten as small-multi-unit commercial residential. Standard home insurers (TD, Allstate, Belair) typically transfer the policy to their commercial subsidiaries. Premium runs $2,800 to $4,800/year for a fourplex versus $1,400 to $2,200 for the prior single-family. Disclose at occupancy — failure to disclose voids coverage.

No. A multiplex up to 4 units remains in the residential R-zone under By-law 569-2013. Property tax classification stays residential for properties under 7 units. The multiplex is a residential use of land, distinct from apartment buildings (Part 3 OBC, commercial property tax).