Home Additions

Types of additions we build

Home additions come in a few categories, and each one has different structural and permitting requirements:

• Second-storey additions: Adding a full or partial second floor to a single-storey home. Requires structural assessment of the existing foundation and framing to confirm load capacity
• Bump-outs and extensions: Expanding the footprint at ground level, typically a larger kitchen, a new family room, or an expanded primary bedroom. Requires new foundation work
• Attached secondary suites: Building a connected but separate dwelling unit for family or rental income. Same code requirements as a standalone suite
• Garage conversions with additions: Converting an existing garage to living space and building a new garage or carport elsewhere on the lot

Structural and foundation requirements

Adding a second storey to a home that was built as a single-storey means the existing foundation was designed for half the load it's about to carry. A structural engineer needs to assess the foundation, the framing, and the load path before any design work begins. In some cases, the foundation needs reinforcement: helical piles, underpinning, or a new perimeter footing.

Ground-level additions need new foundations that tie into the existing structure. On the North Shore, where soil conditions vary from clay to rock within a single neighbourhood, the foundation design depends entirely on what's underground. We coordinate geotechnical reports and structural engineering as part of the pre-construction process.

Zoning and setback considerations

Every lot in North Vancouver has a maximum buildable area defined by the zoning bylaw: lot coverage, FSR (floor space ratio), building height, and setbacks. An addition has to fit within those limits, and on many North Shore lots, the existing house is already close to the maximum. Before designing an addition, we verify the remaining buildable area with the municipality.

The District of North Vancouver and the City of North Vancouver have different zoning bylaws. A lot in Lynn Valley has different setback requirements than a lot in Lower Lonsdale. The difference matters. A 2-foot variance in rear setback can determine whether a bump-out is feasible. We handle the zoning review as part of the feasibility process.

Costs and timeline

Home additions in North Vancouver run $300 to $450 per square foot for finished space, depending on the type of addition and the condition of the existing structure. A 400 sq ft ground-level bump-out might cost $130,000 to $180,000. A 600 sq ft second-storey addition runs $200,000 to $300,000, including structural reinforcement.

Permits for additions take 3 to 6 months to process. Construction runs 4 to 8 months depending on scope. We manage the full sequence: feasibility, design coordination, structural engineering, permit submission, and construction through to completion. The goal is one team managing the entire process: no gaps between the architect, the engineer, and the builder.