Converting your house into a multiplex: the step-by-step process

Turning a single-family house into a multiplex is the most direct way to convert home equity into monthly income. Done in the right order, it’s a predictable process. Done in the wrong order, it’s how people buy expensive surprises. Here’s the sequence that works.

Step 1 — Feasibility (2–4 weeks)

Before any design: what does the lot and structure actually support? We review zoning for your address, assess the house — basement height, structure, exits, services — and model unit counts, costs, rents and financing. The decision to proceed (and whether to convert, add on, or rebuild) is made on numbers, not hope.

Step 2 — Design and drawings (2–4 months)

Architecture that maximizes rentable space within the rules: unit layouts, fire separations, sound assemblies, mechanical and electrical design. Good multiplex design is a specialty — the difference between three awkward units and three units that rent instantly is made here.

Step 3 — Permits (1–2 months)

Building-permit submission and municipal review. Clean, complete drawings keep this short; if minor variances are needed, a Committee of Adjustment application adds time — another reason feasibility comes first, so variances are known early, not discovered late.

Step 4 — Construction (8–12 months for conversions)

Demolition, structure, fire separations, new mechanical and electrical systems, units finished for durability. New-build replacements typically run 12–24 months. This is where end-to-end management earns its keep: one team owning budget, schedule and trades.

Step 5 — Occupancy and lease-up

Final inspections, occupancy, and leasing. With pricing set from the feasibility model and finishes chosen for the rental market, well-located units in Toronto typically lease within weeks — and the property starts doing its job: paying you.

What makes a house a good candidate

• A basement with usable height (or the budget to underpin) — it’s the cheapest rentable space in the building.
• A structure and layout that can host separate exits for each unit.
• A lot with room for a garden suite later — a second phase of income.
• Rents on your street that support the unit mix you’re building.