About Affinity Design Group
Architecture. Structural. MEP.
One firm. One coordinated plan set.
Affinity Design Group delivers complete permitted plan sets — architecture, structural, and MEP — under PE oversight. Your project moves from design to approval without the coordination gap that delays most California builds.
Every project is led by a licensed PE. Every deliverable reflects PE-level judgment.
Daniel De Witte, P.E. #82726, provides PE-level oversight on every Affinity project — scoping, quality control, code compliance review, and stamping authority. Production and drafting are handled by a qualified team under PE supervision.
The result: you get the responsiveness and capacity of a firm, with the accountability and judgment of a PE on every plan set.
Complete plan sets. Not just one discipline.
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.
Architectural Design
Full architectural drawings — floor plans, elevations, sections, and details. Coordinated with structural and MEP before delivery.
Includes design development, permit set, and construction documents.
Structural Engineering
PE-stamped structural calculations and drawings — seismic, wind, gravity, foundation, framing, lateral systems, and connection details.
CBC, ASCE 7, ACI 318, NDS, AISC code compliance on every project.
MEP Engineering
Mechanical, electrical, and plumbing engineering coordinated with the architectural and structural package. No separate consultant needed.
Eliminates the most common plan check correction trigger: MEP/structural misalignment.
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 coordination gap is the problem nobody warns you about.
Most plan check corrections aren't engineering errors. They're coordination failures between separately-hired consultants.
Three firms. Three billing relationships. Nobody owns the gap.
You hire arch, structural, and MEP separately
Drawings from separate firms don't coordinate
Plan check corrections nobody takes responsibility for
Your GC calls three people to answer one question
You become the project manager — unpaid
One firm. Complete plan set. All disciplines aligned before submission.
Architecture, structural, and MEP from a single firm
All disciplines reviewed for coordination before plan check
PE oversight and stamp across the entire package
One number for your GC to call throughout construction
Project closes clean — inspector signs off without a flag
Who we work with
Homeowners, contractors, developers, and architects.
For homeowners
You don't need to understand which disciplines your project requires — that's our job. We scope the full engagement, tell you exactly what's needed, and guide you from first call to approved permit.
Plain-language guidance through the permit process
One firm handling all disciplines — no coordination on your end
Written scope and firm quote before any work starts
GC referral connections when plans are approved
For contractors & architects
Your design and engineering firm should make your job easier. Plan sets detailed enough that framing crews don't call with questions. RFI responses the same day they're sent. One number for everything.
Construction-ready plan sets — no field guesswork
Direct PE line for RFIs and inspection-day questions
We plug in alongside your existing architect if needed
Available through construction — not just through stamp
Start your project in three steps.
Tell us what you're building. Get a firm quote within 24 hours.
Submit your project
Tell us the project type, address, and timeline. We'll confirm which disciplines you need — architecture, structural, MEP, or all three — and send a written scope with a firm fee within 24 hours.
Get PE-stamped plans
Your complete plan set is built with all disciplines coordinated before submission. Every set is reviewed against your city's plan check standards. Typical turnaround: 5 days for conversions, 2–3 weeks for additions, 3–5 weeks for full plan sets.
Build with PE support
When construction starts, your PE stays available for RFIs, field questions, and inspection-day support. Plan check correction responses within 48 hours. Same-day response — included at every price point.
What Homeowners and Contractors Say
"He was reasonably priced, knowledgeable, committed and always available."
— Google Review, Irvine, CA
"From the first consultation visit to the delivery of final plans, Daniel went above and beyond to help us.""
— Yelp Review, Orange County, CA
"Daniel's patience and attention to detail were exceptional in designing condo units for my multi-zoned property.""
— Yelp Review, Orange County, CA