
ADU structural and civil engineering for Ventura County — serving homeowners in Ventura, Oxnard, Thousand Oaks, Camarillo, Simi Valley, and surrounding communities. PE-stamped plans in 2–3 weeks, with unlimited plan-check revisions within scope(1).
Ventura County sits between Los Angeles and Santa Barbara, offering a mix of coastal cities, inland valleys, and canyon communities. From beachside neighborhoods in Ventura and Oxnard to the Conejo Valley communities of Thousand Oaks and Simi Valley, the county's varied geography means structural requirements shift from one project to the next.
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 Ventura: 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 Ventura 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 Ventura, Oxnard, Thousand Oaks, or unincorporated Ventura County.
Most Ventura 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 Ventura County's coastal wind loads, varied terrain, and corrosion exposure. Ventura County is known for its Santa Ana wind patterns and coastal exposure. Properties near the coast or in canyon areas may fall into higher wind speed design categories. We calculate wind loads based on your property's actual exposure and design roof-to-wall connections, lateral bracing, and framing details accordingly. Combined with the county's active fault systems, every plan addresses both wind and seismic loading.
We serve all cities in Ventura County including Ventura, Oxnard, Thousand Oaks, Camarillo, Simi Valley, Moorpark, Fillmore, Santa Paula, Port Hueneme, Ojai, Piru, El Rio, Saticoy, Somis, Oak View, 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 Ventura 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 Ventura County garage conversions.
Ventura County cities have varying permitting systems. The City of Ventura and Thousand Oaks support electronic submittals. 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 Ventura County ADU or JADU project.
Trusted by homeowners throughout Ventura County • Licensed California PE Engineers • Serving projects across all of Ventura County