Structural Engineer in Irvine, CA
Structural Engineering · Irvine
Daniel De Witte, P.E. #82726, is based in Irvine and handles every structural engineering project directly. ADUs, garage conversions, room additions, load-bearing wall removals, and structural inspections with same-day response.
Structural Engineering Services in Irvine, CA
Irvine is home to Affinity Design Group. Daniel De Witte works with Irvine homeowners and contractors on everything from ADU conversions in Great Park and Woodbury to second-story additions in Turtle Rock and Northwood. Irvine's building department has specific plan check standards — every set of drawings is reviewed against those standards before submission. Whether you're a homeowner navigating your first ADU or a GC who needs detailed structural drawings on a tight timeline, Affinity delivers PE-stamped plans that pass plan check and hold up under inspection. Beyond structural engineering, Affinity delivers complete plan sets with architecture, structural, and MEP coordinated under one PE — so Irvine homeowners and GCs don't need to hire and manage separate firms.
ADU & garage conversion
PE-stamped plans for garage-to-ADU conversions, detached ADUs, and JADUs. Foundation, framing, and lateral design. From $1,200.
CBC §1908 and ASCE 7-22 govern seismic design for Irvine ADUs. Irvine's building department requires specific shear wall schedule formatting on all ADU submissions.
Room additions & remodels
Structural calculations for ground-floor additions, second stories, and open-concept remodels. From $2,500.
Second-story additions in Irvine trigger full existing-foundation evaluation per CBC §1809. Turtle Rock and Northwood hillside lots may require geotechnical coordination.
Load-bearing wall removal
Beam sizing, column design, and PE-stamped plans for safe wall removal and open floor plans. From $1,200.
Wall removal requires lateral system redesign if the wall is a shear panel. LVL beams are standard for residential spans; steel for spans over 20 feet.
Inspections & PE letters
PE-stamped letters for real estate transactions, insurance claims, and permit compliance. Reports in 3–5 days. From $400.
PE letters for Irvine real estate transactions typically reference CBC structural adequacy standards. Reports include visual assessment and PE-stamped findings.
Commercial & TI
Structural engineering for Irvine tenant improvements, seismic anchorage, equipment platforms, and commercial code compliance.
Irvine's commercial projects follow CBC Chapter 17 for TI structural modifications. Seismic anchorage per ASCE 7 Chapter 13 for nonstructural components.
Seismic retrofit
Foundation bolting, cripple wall bracing, and soft-story strengthening for older Irvine buildings. From $2,500.
Most Irvine residential construction is post-1970s and built to modern seismic codes. Retrofit demand is lower than older OC and LA cities but applies to some Northwood and University Park homes.
Complete Plan Sets
Architecture, structural engineering, and MEP coordinated under one PE's oversight. One engagement, one set of drawings, one point of contact. No separate consultants to manage.
Architectural design — floor plans, elevations, sections, PE-stamped structural calculations and drawings, MEP engineering — mechanical, electrical, plumbing, All disciplines coordinated before submission, Plan check corrections + construction support
Three phases. Full PE oversight. Zero surprises.
From the first call to the final inspection, every project is led by a licensed PE with direct access throughout.
Clarity Before You Build
Submit the form. Tell us the project type, address, and timeline. You'll have a written scope and firm fee within 24 hours.
Engineered for Approval
Supported Through the Build
Direct PE access during construction. RFIs, field questions, inspector issues — same business day. The engineer who designed your project is the same one your GC can call.