ADU Engineering in California
California Licensed Engineers provides complete ADU (Accessory Dwelling Unit) structural engineering for homeowners and contractors throughout California. We design permit-ready structural plans for detached ADUs, garage conversions, and attached additions. Our stamped plans and calculations meet California Building Code and local jurisdiction requirements for fast permit approval — whether you're building a new detached unit, converting a garage, or adding a junior ADU (JADU).
95% of New Clients Get a FREE Quote on First Call
Call (844) 722-3647 — fast response available
What We Do
- Detached ADU structural design and plans
- Garage conversion structural engineering
- Attached ADU and JADU engineering
- Foundation design for ADUs
- Seismic design per California Building Code
- Permit-ready stamped plans and calculations
When You Need This Service
- Building a new detached ADU on your property
- Converting a garage into a living space
- Adding an attached ADU or JADU
- Building department requires stamped ADU plans
- Need pre-approved ADU plans adapted to your site
- Your ADU plans were rejected and need corrections
Plans & Permit Support
We prepare permit-ready engineering plans, stamped calculations, and documentation designed for fast approval by California building departments. If your plans were rejected, we review correction notices, redesign for compliance, and resubmit. We guide you through the entire permit process.
Call to Discuss Your Permit Needs — (844) 722-3647Inspection & Report Options
Our licensed engineers provide structural inspections, foundation evaluations, forensic investigations, and property condition assessments. Every inspection includes a stamped, signed report with findings, analysis, and recommendations — suitable for permits, real estate transactions, insurance claims, and legal proceedings.
Schedule an Inspection — (844) 722-3647Why Hire a Licensed Engineer
7,000+ projects completed. Speak directly with a California-licensed engineer — no voicemail, no delays.
California Licensed
CA License #C 98780 — stamped plans and reports accepted statewide.
7,000+ Projects
Proven track record across residential, commercial, and industrial work.
Speak Directly
Call and talk to a licensed engineer immediately — no middlemen.
Permit-Ready Plans
Plans designed for fast approval with minimal corrections.
Fast Response
Same-week availability in most areas — we move at your project's speed.
Full-Service
Structural, civil, forensic, plans, inspections, and reports — all in one call.
Areas We Serve in California
We serve all California cities and counties. Don't see your city? Call to confirm service in your area.
Full-Service Engineering
One call for plans, inspections, permits, structural, civil & forensic engineering.
Still Designing Your ADU? Plans & Feasibility Support
If you're earlier in the process — exploring layouts, costs, or what your lot allows — our sister site QuiPlans offers a free ADU assessment, PE-stamped floor plans, and complete permit packages from licensed engineers.
QuiPlans and QuiPermit are part of the Licensed Structural Engineers family — plans and permitting handled by the same licensed engineering team. California Licensed Engineers remains your engineer for stamped plans, inspections, and retrofit engineering.
ADU Engineering — FAQs
Have questions about your project?
Call and speak directly with a licensed California engineer.
(844) 722-3647Speak With a Licensed Engineer Today
One call for adu engineering, plans, inspections, permits, and full-service engineering support across California.
(844) 722-3647