A California-licensed structural engineer and studio.
CMZStudio is a California-licensed structural engineering studio. We focus on one thing, sound and code-compliant structure, available directly to architects, contractors, and homeowners.
- Founded
- 2019 Founded
- License issued
- 2006 License issued
- CA Civil Engineer
- C-69809 CA Civil Engineer
- Core services
- 6 Core services
Structural engineering, built to get permitted.
CMZStudio is the structural engineering that turns a design into something a city will permit and a crew can build: the calculations, retrofits, and foundation work behind sound construction, available directly to outside design and build teams.
Our drawing standards and engineering workflow are built for California's permit environment. The result is a set that arrives complete: clear calculations, coordinated drawings, and the connection details a contractor can build from.
Built on engineering, technology, and accuracy.
We capture existing conditions with Matterport 3D scanning when it fits the project. Combined with disciplined engineering workflows, that supports clearer structural sets and fewer unresolved field conditions.
- Matterport 3D capture
- Exact as-built conditions on day one, so the structure is designed to what's really there.
- Workflows built from scratch
- Drawing standards and engineering processes tuned for California's permit environment.
- Plan-check support
- Clear structural responses and revised documents when the reviewing agency requests them.
CMZStudio is led by Lei Zheng, California Civil Engineer C-69809, whose official license record has been active since 2006.
Lei Zheng brings two decades of California-licensed practice to residential and commercial structural work.
At CMZStudio, he reviews structural decisions, prepares and signs engineering documents within his responsibility, and supports responses through city plan check.
The practice focuses on seismic retrofits, load-bearing wall changes, foundations, ADUs, structural calculations, permit drawings, and exterior elevated element inspections.
Lei Zheng
Founder & Principal Engineer, CMZStudio
California Professional Engineer
Licensed engineering from first calculation through plan check.
Lei Zheng has held a California Civil Engineer license since 2006. At CMZStudio, he reviews structural decisions, prepares and stamps engineering documents, and supports responses through city plan check.
Official California DCA record
C-69809
- License holder
- Lei Zheng
- License type
- Civil Engineer
- Issued
- March 17, 2006
Status verified July 23, 2026
- California-licensed
- 20 years
- Official DCA record
- C-69809
Engineering rigor, made legible.
We translate architectural intent into a sound, code-compliant structural system — and a coordinated permit set with ongoing structural plan-check support.
- 01DiscoverReview drawings, site, and structural intent.
- 02AnalyzeRun gravity and lateral analysis against current code.
- 03EngineerDesign the structural system and detail the connections.
- 04Stamp & SubmitDeliver stamped calculations and plan-check support.