When to hire a structural engineer
Involve a structural engineer early when you are changing how the building carries gravity or lateral loads, when code compliance is unclear, or when an authority having jurisdiction requests stamped drawings. Typical triggers include removing or altering walls, adding floors or mezzanines, changing use or occupancy, strengthening for seismic performance, assessing an existing building for a new use, or supporting heavy equipment and rooftop installations.
- Early coordination reduces rework and helps align architecture, MEP, and construction.
- Stamped drawings document load paths and compliance for permit review.
Load paths in wood-frame buildings
Gravity loads (snow, roof, floor, and self-weight) travel through joists and beams to walls or posts, then into foundations. Wind and earthquake loads create shear and overturning that must be resolved with shear walls, braced frames, or equivalent systems, tied into the foundation. A sound design keeps these paths continuous; a renovation that cuts a brace or removes a shear wall without replacement can overload other elements.
- “Path of least resistance” is not how structures work—loads follow connected stiffness.
- Field verification often matters for older buildings where as-built conditions differ from drawings.
Seismic design basics in BC
BC adopts the BC Building Code, which references structural design standards for new construction and substantial alterations. Seismic hazard varies by location; designers use site class, importance category, and system type to proportion lateral-force-resisting systems. Retrofits may target life-safety, damage control, or targeted upgrades depending on performance goals and feasibility.
- Older buildings may not meet current code; upgrades are often triggered by renovation scope or change of use.
- Analysis and detailing (connections, collectors, diaphragms) are as important as adding new walls.
Permits, drawings, and the engineer’s role
Building officials review submissions for compliance with applicable codes. Structural drawings describe members, connections, loads, and referenced standards. The engineer of record may also provide schedules, details, and coordination with architect and other disciplines. Construction-phase services can include shop drawing review and site visits when contractually included.
Renovations: openings and bearing walls
Creating a large opening or removing a wall requires checking whether the wall supports vertical load, resists lateral load, or both. Solutions may include beams, posts, engineered lumber or steel, and new or strengthened shear elements. Fire and acoustical ratings must often be maintained where required by code.
Strata depreciation reports
Depreciation reports help strata corporations plan for repair and replacement of common property and assets—including many Vancouver and Lower Mainland condos under the Strata Property Act. A qualified professional assesses visible conditions and expected life cycles to support reserve funding. Structural components (envelope, balconies, parkades, etc.) may be included; understanding what is observed versus what is concealed is important for interpreting recommendations.
Learn about RSTRUCT’s depreciation report services.
Solar panels and structure
Rooftop arrays add weight and uplift; the roof deck, fasteners, and supporting framing must be checked for capacity and durability. Ballasted systems change gravity distribution; mechanically attached systems need pull-out resistance. A structural feasibility review confirms that the existing building can support the proposed layout and loading.
Structural feasibility for solar panels
Official resources & further reading
Use authoritative sources for code text and bulletins. Your technical library on this site summarizes useful service-life and material notes for planning; always verify against current code and project-specific requirements.
