Structural Engineer in Downey, CA
Structural Engineering · Downey
Daniel De Witte, P.E. #82726, provides PE-stamped structural plans for Downey homeowners and contractors. ADUs, additions, wall removals, and inspections with same-day response.
Structural Engineering Services in Downey, CA
Downey has an active ADU and garage conversion market driven by California housing policy and strong rental demand. Many Downey homeowners are converting garages, adding units, or expanding existing homes on established lots. Affinity Design Group provides PE-stamped structural drawings designed for Downey's building department standards. Every set is reviewed for plan check compliance before submission. For Downey projects requiring more than structural, Affinity provides complete coordinated plan sets covering architecture, structural engineering, and MEP under one PE's oversight.
ADU & garage conversion
PE-stamped plans for Downey ADU projects. Active garage conversion market with strong rental demand. From $1,200.
Downey has a mix of post-war slab-on-grade homes and raised-foundation properties. ADU and garage conversion demand is high due to California housing policy and strong rental market in Southeast LA County.
Room additions & remodels
Structural engineering for Downey room additions and second stories. From $2,500.
Downey's mix of slab-on-grade and raised-foundation homes means addition engineering starts with foundation type verification.
Load-bearing wall removal
Beam sizing for open floor plans in Downey homes. PE-stamped plans. From $1,200.
Standard California wood-frame wall removal in Downey. LVL beams for spans under 20 ft; steel headers for larger openings.
Inspections & PE letters
PE-stamped inspection letters for Downey property transactions. From $400.
Downey inspection letters are frequently requested for multi-family properties and older single-family homes during escrow.
Commercial & TI
Structural engineering for Downey commercial TI, restaurant conversions, and industrial modifications.
Downey's commercial corridor along Firestone Blvd has active TI demand. Standard CBC structural requirements for commercial modifications.
Seismic retrofit
Foundation bolting and shear wall upgrades for older Downey residential properties. From $2,500.
Downey's post-war housing includes both slab-on-grade and raised-foundation homes. Retrofit scope varies by foundation type — verify before quoting.
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.