BC Multiplex Development Guide: SSMUH 2025
Multiplex Development Under BC SSMUH Legislation
BC’s Small Scale Multi-Unit Housing Act allows 3–6 units on single-family lots near transit — a transformative change for Metro Vancouver homeowners considering infill development.
What SSMUH Allows (Province-Wide)
- Standard urban lots: 3–4 units minimum
- Within 400m of frequent transit: Up to 6 units
- Previous single-family only zones: Must now allow the above
Typical Multiplex Development Formats
- Duplex (2 units) — simplest form
- Triplex (3 units) — very popular post-SSMUH
- Fourplex (4 units) — maximizes density on standard lot
- Townhouse row (4–6 units) — for larger or corner lots
Development Costs (Metro Vancouver 2025)
| Unit Type | Hard Cost per Door |
|---|---|
| Duplex (per unit) | $400,000–$700,000 |
| Triplex/Fourplex (per unit) | $350,000–$600,000 |
| Townhouse (per unit) | $380,000–$650,000 |
Design Requirements
Multiplexes must comply with: BC Building Code (Part 3 for 4+ units), fire separation between units, parking requirements (varies by city), and the BC Energy Step Code 3 minimum.
→ See also: Vancouver Renovation Permits Guide
More Laneway Homes & Multiplexes Guides
Retail Store Build-Out in Richmond: Zoning and Space
Egress Window Installation Requirements in BC: Sizes and Wells
Maximizing Space in a Laneway Home: A Practical Design Guide
Laneway Home Builders in Richmond: How to Choose the Right Builder
Laneway House vs. Basement Suite: Maximizing Rental Income in Vancouver (2026)
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