
ADU engineering in San Diego County is tailored for regional topography, county-level seismic and wildfire risk assumptions, and unincorporated permit-path requirements. San Diego County ADU structural engineering focused on regional topography, county-wide seismic and wildfire risk criteria, and unincorporated permit pathways.
San Diego County ADU projects require structural planning for regional terrain variation, county-wide seismic and wildfire criteria, and unincorporated permit pathways. Across San Diego County, ADU projects are engineered for valley/foothill terrain transitions, jurisdiction-wide hazard conditions, and county plan-check standards in unincorporated areas.
Single-family ADUs are secondary housing units that are located on the same lot as a single-family home. These units are also sometimes referred to as granny flats, in-law suites or backyard cottages.
Share a few project details and our engineering team will review your scope and guide you through permitting and design next steps.
After reviewing your project details, we'll provide a transparent quote the same day--typically within a few hours. Pricing varies based on project scope, complexity, and requirements.
We deliver complete structural permit sets. *If building departments have comments related to our scope, we handle all revisions--no extra fees, no limits.
See why homeowners and industry professionals trust us with their projects.
We engineer all six ADU types in San Diego: attached, detached, garage conversion, basement, junior (JADU), and multi-family. Each project is designed for your property's specific lot, soil, and code conditions.
Costs depend on project size, complexity, and site conditions. Our fixed-price quotes include:
• Structural calculations and PE-stamped plans
• Foundation and framing design
• Lateral system and seismic engineering
• Civil engineering coordination
Same-day quotes available — no hidden fees. Get a free quote for your San Diego County project.
Yes — California requires PE-stamped structural plans for every ADU. This covers foundation design, framing, and seismic compliance. This applies whether you're building in San Diego, La Jolla, Chula Vista, or unincorporated San Diego County.
Most San Diego County ADU plan sets are completed in 2–3 weeks — structural calculations, foundation design, framing plans, and civil coordination included. Rush service is available for urgent timelines.
Yes — we engineer ADUs for San Diego County's coastal wind loads, varied terrain, and corrosion exposure. Properties near San Diego's coastline—from Coronado and La Jolla to Carlsbad—face elevated wind exposure and marine conditions that affect structural design. Inland, canyon-edge and bluff-top properties require slope-sensitive foundations and retaining elements. We calculate wind loads and design lateral systems based on your property's actual exposure, terrain, and proximity to the coast.
We serve all cities in San Diego County including San Diego, La Jolla, Chula Vista, Encinitas, Carlsbad, Oceanside, Vista, San Marcos, Escondido, El Cajon, National City, Coronado, Solana Beach, Del Mar, Poway, and all unincorporated areas. Each city may have additional requirements, which we address in your plans.
Under California ADU law:
• Detached ADUs: up to 1,200 sq ft
• Attached ADUs: up to 850 sq ft
• Junior ADUs: up to 500 sq ft
Specific limits may vary by city within San Diego County. We size and engineer your ADU to the maximum allowed on your lot.
Most ADUs don't require additional parking. Parking is typically waived when the ADU is:
• Within 0.5 miles of public transit
• In a historic district
• A conversion of an existing garage
Check with your specific city for local rules.
Yes — garage conversions are one of the most popular ADU types, and you typically don't need replacement parking. Our engineering scope covers slab analysis, wall framing, ceiling structure, and seismic design for San Diego County garage conversions.
The City of San Diego has a streamlined online ADU permit process. Other cities within the county have varying systems, most transitioning to digital submittals. We deliver PE-stamped plans in PDF, ready for submission — all required sheets, calculations, and documentation included. We also handle every plan-check comment through final approval.
Yes. Our construction admin services include:
• Contractor RFI responses
• Submittal review
• Structural site observations
• Certification letters
This ensures your ADU is built to plan and code.

Get a free, no-obligation quote within 24 hours for your ADU structural engineering needs. Our licensed engineers are ready to help with your San Diego County ADU or JADU project.
Trusted by homeowners throughout San Diego County • Licensed California PE Engineers • Serving projects across all of San Diego County