SSMUH Multi-Unit Housing Design & Permits | Bill 44 Vancouver BC

The End of Single-Family Zoning

Single-family zoning in British Columbia has fundamentally changed. Under the Province's Small-Scale Multi-Unit Housing (SSMUH) legislation (Bill 44), the vast majority of residential lots in urban municipalities now allow multiple units as-of-right.

A multiplex project is an investment decision first and a design decision second. Our job is to give you the technical expertise necessary to navigate these Provincial mandates—from the initial density assessment to the permit-ready multiplex drawings—so you can turn a legislative shift into a tangible return on investment.

Duplex, Triplex & 4-6 Plex Capacity

Just because the Province says you can build 6 units doesn't mean your specific lot physically supports them. The allowable density depends heavily on your lot size, lane access, and proximity to major transit hubs (Transit-Oriented Areas).

We establish your baseline immediately:

• Lot Size & Setbacks: Determining the exact buildable envelope for the primary structures.
• Unit Configuration: Evaluating whether the best financial yield comes from a standard side-by-side Duplex, a Triplex with a detached coach house, or a full 6-plex structure.
• Infrastructure Capacity: Identifying municipal water and sewer upgrade requirements triggered by the increased occupant load.

Floor Plan Optimization

In multi-unit housing, every wasted square foot is lost revenue. Our design process focuses heavily on floor plan optimization to maximize your rentable square footage.

We engineer layouts that aggressively minimize dead space—like oversized hallways or inefficient mechanical routing—and reallocate that footprint into the bedrooms, kitchens, and living areas that drive higher appraisal values and rental rates.

Fire Separations & Exits

Designing a 4-plex is not the same as designing a big house. The BC Building Code treats multi-unit dwellings with strict scrutiny regarding life safety.

We take the extra time during the schematic phase to engineer robust fire separations and staggered stud assemblies to save you severe headaches and costly revisions at the City later.

Critical compliance factors we handle:

• Continuous Fire Barriers: Specifying the exact drywall, insulation, and fire-stopping assemblies required to achieve full 1-hour or 1.5-hour ratings between all dwelling units.
• Independent Egress: Designing code-compliant primary and secondary exit paths for every unit, ensuring safe evacuation without relying on shared interior corridors where possible.
• Spatial Separation: Calculating the maximum allowable window and door glazing on exterior walls to prevent fire spread to neighbouring properties.

Full Permit Management

Executing a multiplex permit requires heavy coordination across multiple professional disciplines. We manage the entire permit package from start to finish.

We act as the central hub for the project, integrating the structural engineer's Schedule B, the geotechnical reports, and the Energy Advisor's Step Code modeling directly into our architectural set. When the package hits the municipal intake desk, it is bulletproof, complete, and designed to move through plan review with minimal friction.

Step 1: Density Assessment

We run your address through municipal zoning and provincial SSMUH layers to establish your maximum legal unit count, Floor Space Ratio (FSR), and allowable building height.

Step 2: Floor Plan Optimization

We draft the floor plans, focusing on structural efficiency, stacked plumbing walls, and maximized rentable square footage.

Step 3: Fire Separation & Code

We detail the highly technical life-safety requirements, mapping out fire-rated assemblies, sound transmission barriers, and compliant egress routes.

Step 4: Full Permit Management

We coordinate the required external engineers, assemble the final application, and submit the complete multiplex package to the municipality on your behalf.