Flat-Fee Structural Engineering — Quoted Before Any Work Begins
Every project gets a written scope and a firm fee within 24 hours of your first call. No hourly billing. No surprise invoices. You know exactly what you're paying before you commit.
How You Get Your Quote
Three steps. No guesswork. No obligation until you're ready to move forward.
Describe your project
Submit a quick form. Tell us what you're building, where it is, and your timeline. Takes about 2 minutes.
Get your written scope
Within 24 hours, you receive a written scope document with exactly what's included, what's excluded, the firm fee, and the projected timeline.
Approve and start
If the scope looks right, you approve and submit the deposit. Engineering starts immediately. Questions? We'll walk through everything on a call before you commit.
Project Types & What's Included
Every fee is quoted per-project based on scope, complexity, and jurisdiction. Here's what each project type typically includes.
ADU & Garage Conversion Engineering
PE-stamped structural plans for accessory dwelling units — attached, detached, and garage-to-living-space conversions. Foundation, framing, seismic, and lateral system design built for first-round plan check approval in your city.
Structural calculations — seismic, wind, gravity
Foundation evaluation and design
Framing plans with connection details
PE stamp and jurisdiction-specific plan check review
One round of plan check correction support
Room Additions & Remodels
Structural calculations and drawings for room additions, second stories, open-concept remodels, and home expansions. Beam sizing, foundation design, load path analysis, and permit-ready plans detailed enough that your framing crew works without field calls.
Complete structural design package
New foundation or foundation modification design
Framing plans, beam sizing, and connection details
Lateral system and shear wall design
PE stamp and plan check support
Load-Bearing Wall Removal
Structural analysis for safe load-bearing wall removal. Beam and column sizing, header design, and PE-stamped plans with permit-ready documentation for open-concept remodels.
Load analysis and beam/column sizing
Header and connection detail design
PE-stamped permit-ready drawings
Foundation modification assessment (if required)
Structural Inspections & PE Letters
PE-stamped structural inspection letters for real estate transactions, insurance claims, permit compliance, and property assessments. Site visit, structural evaluation, and written report with findings and recommendations.
On-site structural evaluation
PE-stamped letter with findings and recommendations
Real estate, insurance, and permit compliance
Reports delivered in 3–5 business days
Commercial Structural Engineering
Structural engineering for commercial tenant improvements, seismic anchorage, equipment platforms, and code compliance. PE-stamped calculations and drawings for permit submittal on commercial projects across OC and LA County.
Tenant improvement structural design
Seismic anchorage and equipment platforms
Code compliance review and PE stamp
Plan check preparation and correction support
Seismic Retrofit Engineering
Residential and commercial seismic retrofit design. Foundation bolting, cripple wall bracing, shear wall design, and soft-story reinforcement. PE-stamped plans for permit approval and contractor execution.
Foundation bolting and cripple wall bracing
Shear wall design and reinforcement
Soft-story strengthening
PE-stamped retrofit plans and calculations
What's Included at Every Price Point
No matter the project size, every Affinity engagement comes standard with these commitments.
Direct PE access
Daniel De Witte, P.E. #82726, leads every project with PE-level oversight from scope through final inspection. No junior engineers. No handoffs.
Same-business-day response
Every call, text, and email is returned the same business day. No exceptions.
Jurisdiction-specific plan check review
Before your drawings are submitted, we review them against your city's known plan check triggers — keeping correction rates low and timelines on track.
Construction-phase support
When construction starts, your PE stays available for RFIs, field questions, inspector issues, and site visits. Standard — not an upsell.
Revision guarantee
If your plans require revisions due to an error or omission on Affinity's part, they are revised at no additional charge. Period.
The Cheapest Quote Rarely Stays the Cheapest
Here's what we see from clients who come to Affinity after a bad experience elsewhere.
What cheaper engineering costs you
Plan check corrections add 4–8 weeks to your permit timeline. Vague drawings lead to field RFIs and inspection failures. An unresponsive engineer during construction means your GC makes structural calls they shouldn't have to. Every week of delay costs real money in contractor holds and schedule disruptions.
What Affinity's fee covers
Detailed drawings your GC can build from without field calls. Plans reviewed against your city's standards before submission. Same-day response throughout the project. Construction-phase support through final inspection. Clients who compare the total project cost — not just the engineering fee — consistently find that quality engineering saves money downstream.