Do I need structural engineering for a garage conversion?

Conversion design starts by understanding how the garage carries roof and lateral loads and how its slab, stem walls, footings, and framing were built. I ask clients for photos, measurements, exposed edges, and evidence of settlement or water intrusion when construction records are incomplete, so the responsible engineer can evaluate the existing structure.

• Record slab elevation, cracks, joints, drainage, and visible foundation conditions
• Verify wall, roof, header, and connection framing around the garage opening
• Identify prior additions, alterations, damage, and concealed-condition limits
• Coordinate floor and wall interfaces with the existing dwelling

Replacing an overhead door with a wall, windows, or a new entry can require new framing and anchorage. Raising or replacing a floor can affect foundation height, moisture detailing, wall bracing, stairs, and connections. The structural design must follow each changed load path instead of assuming a cosmetic infill.

• Design infill framing and support at the former garage opening
• Evaluate new headers, posts, shear elements, and hold-down or anchorage needs
• Coordinate floor framing or slab work with existing foundations and thresholds
• Check new equipment, storage, roof, and partition loads

A conversion can also involve energy, ventilation, plumbing, electrical, fire, accessibility, and land-use questions. Those requirements belong to the appropriate disciplines and authority; structural engineering should identify interfaces and assumptions without presenting a generic answer as a local approval determination.

• Current architectural conversion plans and occupancy assumptions
• Site and existing-building records needed for engineering
• MEP and envelope changes that add penetrations or equipment
• A coordinated response record for any authority comments