
ADU engineering in Santa Clara County is tailored for regional topography, county-level seismic and wildfire risk assumptions, and unincorporated permit-path requirements. Santa Clara County ADU structural engineering focused on regional topography, county-wide seismic and wildfire risk criteria, and unincorporated permit pathways.
Santa Clara County ADU projects require structural planning for regional terrain variation, county-wide seismic and wildfire criteria, and unincorporated permit pathways. Across Santa Clara 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 Santa Clara: 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 Santa Clara 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 Jose, Palo Alto, Sunnyvale, or unincorporated Santa Clara County.
Most Santa Clara 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 maximize buildable area on Santa Clara County's compact lots while maintaining setback compliance and structural integrity. Silicon Valley lots are often modest in size, which means ADU foundations, setbacks, and structural connections require careful planning. We design structural systems that work within the real constraints of San Jose, Mountain View, and Cupertino lot configurations—not generic templates. The county's proximity to the San Andreas and Hayward-Calaveras fault systems demands rigorous seismic engineering for every project.
We serve all cities in Santa Clara County including San Jose, Palo Alto, Sunnyvale, Cupertino, Santa Clara, Mountain View, Milpitas, Campbell, Los Gatos, Saratoga, Morgan Hill, Gilroy, Los Altos, Los Altos Hills, Monte Sereno, 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 Santa Clara 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 Santa Clara County garage conversions.
Santa Clara County cities generally support online plan submittals. San Jose has a dedicated ADU permit center. Palo Alto and other cities have their own ADU-specific review processes. 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 Santa Clara County ADU or JADU project.
Trusted by homeowners throughout Santa Clara County • Licensed California PE Engineers • Serving projects across all of Santa Clara County