Updated: December 2025
ADU structural engineering in Irvine enables homeowners to maximize property value through accessory dwelling unit construction. Our California-licensed Professional Engineers with 20+ years of experience specialize in ADU design, garage conversions, and detached unit construction throughout Irvine, Tustin, and Orange County. Understanding these engineering requirements is essential for homeowners planning to add rental income or multigenerational living space.
**Why Irvine Homeowners Trust AAA Engineering:** ✅ California Licensed PE (Professional Engineer) ✅ 20+ years serving Irvine and Orange County ✅ 300+ ADU projects completed ✅ Fast turnaround available ✅ Free estimates - no obligation
What is ADU Structural Engineering in Irvine?
**Direct Answer:** ADU structural engineering in Irvine involves designing structural systems for accessory dwelling units, including garage conversions, detached new construction, and attached additions. This includes foundation design, floor and wall framing, roof structure, and compliance with California's ADU laws and Irvine's local requirements.
Irvine's planned community layout and typical lot sizes provide excellent opportunities for ADU development. State laws have streamlined ADU permitting, making it easier than ever to add these valuable living spaces.
Our engineers provide complete ADU structural design meeting all City of Irvine requirements.
What ADU Engineering Services Are Available in Irvine?
**Direct Answer:** Irvine ADU engineering services include garage conversion structural design, detached ADU new construction, attached ADU additions, Junior ADU (JADU) design, and two-story ADU engineering.
**Garage Conversions**
- Foundation evaluation and upgrades
- New floor framing
- Wall and window modifications
- Roof structure if adding second level
**Detached ADUs**
- Foundation design
- Complete framing design
- Connection to utilities
- Compliance with setbacks
**Attached ADUs**
- Tie-in to existing structure
- Foundation extension
- Roof integration
- Fire separation
**JADUs**
- Interior modification design
- Fire separation requirements
- Egress compliance
How Much Does ADU Structural Engineering Cost in Irvine?
**Direct Answer (2025 Pricing):** ADU structural engineering in Irvine typically costs $2,500-$8,000 depending on project type. Garage conversions average $2,500-$4,500, while detached ADUs range $4,000-$7,000. Two-story ADUs may cost $6,000-$10,000.
**Garage Conversions**
- Simple conversion: $2,000-$3,500
- With bathroom additions: $3,000-$4,500
- Second story above garage: $5,000-$8,000
**Detached ADUs**
- Small (under 600 sq ft): $3,000-$5,000
- Medium (600-1,000 sq ft): $4,500-$7,000
- Large (1,000+ sq ft): $6,000-$9,000
**Attached ADUs**
- Ground floor: $3,500-$6,000
- Second story: $5,500-$9,000
Why Choose AAA Engineering for Irvine ADUs?
**Direct Answer:** AAA Engineering Design provides California PE-licensed ADU structural engineering with 300+ completed ADU projects. We understand Irvine's specific requirements and deliver permit-ready plans efficiently.
**Local Expertise**
- Woodbridge
- Turtle Rock
- University Park
- Northwood
- Quail Hill
Contact Us
Ready to add an ADU to your Irvine property? Our licensed Professional Engineers are here to help.
**📞 Call Now: (949) 981-4448** - Free consultation, no obligation
[Get Your Free Consultation →](/contact)
---
Frequently Asked Questions
**Do I need a structural engineer for an ADU in Irvine?** Yes, California requires licensed PE design for ADU construction. City of Irvine requires PE-stamped structural plans for permit approval.
**How long does ADU permitting take in Irvine?** City of Irvine typically processes ADU permits in 30-60 days. Engineering typically requires 2-4 weeks.
**Can I convert my garage to an ADU in Irvine?** Yes, garage conversions are allowed under California ADU law. No replacement parking is required.
**What is the maximum ADU size allowed in Irvine?** Detached ADUs can be up to 1,200 square feet. Attached ADUs have limitations based on lot size.