Room Addition Structural Engineer in Orange County — PE-Stamped Plans for Additions & Second Stories
Structural calculations and drawings for room additions, second-story additions, open-concept remodels, and home expansions. Beam sizing, foundation design, load path analysis, and permit-ready plans your GC can build from.
Structural Engineering for Every Addition Type
Whether you're expanding outward, building up, or reconfiguring your existing layout — each project type has distinct structural requirements.
Ground-floor addition
Expanding the building footprint at grade. Requires new foundation, framing, lateral system, and connections between new and existing structure.
New foundation design
Connection to existing structure
2–3 weeks
Second-story addition
Adding a floor above the existing house. Requires evaluation of existing foundation and first-floor framing plus complete new second-floor design.
Existing structure evaluation
Two-story lateral system
2–4 weeks
Structural remodel
Reconfiguring the interior — wall removals, relocated load paths, new beams. Scope depends on number and type of structural modifications.
Load path redesign
Beam and column sizing
1–2 weeks
Every Addition Package Includes
Structural calculations
Seismic (ASCE 7), wind, and gravity load analysis. Foundation design, beam sizing, connection forces — current California Building Code.
PE-stamped drawings
Foundation plan, framing plan, shear wall layout, connection details — detailed enough that your GC builds from them without field questions.
Jurisdiction review + PE stamp
Drawings reviewed against your city's plan check triggers before submission. PE stamp and signature — P.E. #82726, California.
Corrections + construction support
Plan check corrections responded to within 48 hours. Direct PE access during construction for RFIs, inspections, and field questions.
"From the first consultation visit to the delivery of final plans, Daniel went above and beyond to help us."
— Yelp Review, Orange County, CA
From First Call to Approved Permit
Scope call
Submit the quote form. We review your addition project and send a written scope with a firm fee within 24 hours.
Same-day response. No obligation.
Document collection
Architectural plans, site survey, existing conditions gathered. GC coordination if applicable.
1–2 business days after deposit.
Structural design
Foundation, framing, lateral system, connections — all to ASCE 7, NDS, ACI 318. Reviewed against your city's plan check standards.
Ground-floor: 2–3 weeks. Second story: 2–4 weeks.
Delivery, stamp, and support
PE-stamped drawings delivered. Plan check corrections handled within 48 hours. Your PE stays available through construction for every RFI and inspection.
Support through project close.
Frequently Asked Questions
Do I need a structural engineer for a room addition?
How much does structural engineering cost for an addition?
Do you evaluate my existing foundation for a second story?
How long does addition engineering take?
Do you coordinate with my architect?
What about my existing roof?
Other Structural Engineering Services
ADU Engineering
PE-stamped plans for garage conversions, detached ADUs, and attached ADUs.
Load-Bearing Wall Removal
Beam sizing, column design, and PE-stamped plans for open-concept remodels.
Structural Inspections
PE-stamped inspection letters for real estate, insurance, and permit compliance.