
ADU structural and civil engineering for San Joaquin County — from established neighborhoods in Stockton and Lodi to fast-growing communities in Tracy, Manteca, and Lathrop. PE-stamped plans in 2–3 weeks, with unlimited plan-check revisions within scope(1).
San Joaquin County is one of California's fastest-growing residential regions. Communities like Tracy, Manteca, and Lathrop have expanded significantly as families seek more affordable housing within commuting distance of the Bay Area, while Stockton and Lodi are seeing redevelopment of existing neighborhoods.
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 Joaquin: 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 Joaquin 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 Tracy, Manteca, or unincorporated San Joaquin County.
Most San Joaquin 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 specialize in foundation engineering for San Joaquin County's varied soil conditions. San Joaquin County's position in the Central Valley and Sacramento–San Joaquin River Delta means soil conditions can include alluvial deposits, clay layers with variable bearing capacity, and peat in delta-adjacent areas. We specify foundation systems—depths, reinforcement, and drainage provisions—tailored to the soil characteristics at your specific property.
We serve all cities in San Joaquin County including Tracy, Manteca, 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 Joaquin 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 Joaquin County garage conversions.
San Joaquin County cities have varying permitting processes. Stockton has been expanding its digital submittal capabilities. Smaller cities may require in-person submissions. 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 Joaquin County ADU or JADU project.
Trusted by homeowners throughout San Joaquin County • Licensed California PE Engineers • Serving projects across all of San Joaquin County