Frequently Asked Questions

From signed contract to certificate of occupancy, most of our Thousand Oaks ADUs take 12 to 18 months. Design and permitting consume 4 to 6 months - Thousand Oaks plan check currently runs 8 to 12 weeks, and revisions add time if the city has questions about hillside setbacks or fire access in the wildland-urban interface zones. Construction takes 6 to 10 months depending on weather, which in Ventura County means winter rain delays on foundations and exterior work. We publish a real schedule, not a best-case scenario, and text you when each phase starts. Call (424) 395-4555 for a timeline based on your property.

We start with a site visit to measure your lot, check setbacks, and identify constraints like oak tree preservation zones or slope stability issues. Then we produce schematic designs, refine them with your input, and move to construction documents and engineering. We submit the permit set to Thousand Oaks Building & Safety, respond to corrections, and begin construction only after permit issuance. Throughout, one team owns every phase - no handoff to a separate builder who never saw the design intent. Call (424) 395-4555 to begin with a free site assessment.

Yes. We prepare the full permit set, submit to Thousand Oaks Building & Safety, and manage all corrections through to issuance. This includes planning review if your property requires a variance, fire department sign-off for properties in the Very High Fire Hazard Severity Zone, and coordination with Ventura County Environmental Health if your septic system needs upgrading. Our team has processed ADU permits in Thousand Oaks since 2015 and knows the current plan check engineers by name. Call (424) 395-4555 - permits are included in our flat price.

Usually yes, though there will be noise, dust, and periodic utility interruptions. For detached ADUs, the main house remains fully habitable. For garage conversions, we sequence the work to minimize disruption - typically 6 to 10 weeks of active construction with power and water shutoffs limited to a few hours at a time. We photograph and document existing conditions before we start, under Clause 4 of The Haven Standard, so any dispute about damage is resolved with evidence. Call (424) 395-4555 to discuss sequencing for your specific project.

We've designed and permitted ADUs throughout the city: North Ranch with its larger lots and equestrian zoning considerations, Lynn Ranch on hillside parcels requiring retaining walls, the older neighborhoods near Downtown Thousand Oaks where garage conversions are common, and the canyon areas toward Westlake Village where fire access and water pressure drive design decisions. Each area has different setback rules, oak tree ordinances, and foundation requirements. Our local knowledge prevents surprises at plan check. Call (424) 395-4555 - we've likely worked on a lot near yours.

We specify materials for durability in Ventura County's climate: hot, dry summers and occasional heavy winter rain. For siding, we often use James Hardie fiber-cement products, which resist the termite pressure common in older Thousand Oaks neighborhoods and carry a 30-year warranty. For prefabricated structural components on appropriate sites, we've worked with Tuff Shed for accessory structures that complement our custom builds. Every material choice is documented in your written scope, with alternatives priced if you prefer a different specification. Call (424) 395-4555 to review our standard specs.

We evaluate prefab options case by case. Abodu and Cover manufacture well-engineered units that can reduce on-site construction time, but they are not automatically cheaper once you factor in site prep, foundation, utility connections, and Thousand Oaks permit compatibility. For flat lots with straightforward access in areas like Newbury Park, prefab can make sense. For hillside sites in North Ranch or custom designs matching existing architecture, site-built typically wins. We quote both paths when appropriate and let the numbers decide. Call (424) 395-4555 to compare options for your property.

Yes, within the allowances in your written quote. We specify standard allowances for flooring, cabinets, countertops, plumbing fixtures, and lighting. Upgrade beyond those allowances and we write a change order with the exact price difference before you commit. Some clients in Calabasas and Malibu bring us specific tile or appliance selections; we verify they meet California energy code and will arrive on schedule before including them. Call (424) 395-4555 to review our allowance schedule.

Yes. Every pro working under our name in Thousand Oaks is required to hold the license and insurance California requires for residential construction. Nadia Ellery leads our local branch, and our license numbers appear on every contract and permit application. We do not invent credentials we cannot produce on request. Call (424) 395-4555 and we'll provide our license information for your verification.

We carry general liability and workers compensation insurance as required for residential construction in California. Our policy documentation is available on request before you sign. This protects you if property damage occurs during construction or if a worker is injured on your site. We also require the same coverage from any subcontractor on your job. Call (424) 395-4555 and we'll send our certificate of insurance for your review.

Yes, and we attend every inspection. Thousand Oaks Building & Safety requires progress inspections at foundation, framing, insulation, and final occupancy. We schedule these around your availability when access through your property is needed, and we do not proceed to the next phase until we have written sign-off. Failed inspections are our responsibility to correct at our cost. Call (424) 395-4555 - permits and inspections are included in our flat price.

We document every job with photos and written reports under Clause 4 of The Haven Standard, so disputes are resolved with evidence, not argument. If a defect appears - a window leak after the first winter rain, for example - we investigate, photograph our findings, and repair under our workmanship warranty. Our phone is answered 24/7 for urgent issues like water intrusion or security concerns from an incomplete lock installation. For non-urgent items, we schedule within our normal workflow. Call (424) 395-4555 anytime - a live coordinator will connect you with the local team.

We are a design-build studio, not an emergency repair service. If your existing ADU has a plumbing leak, electrical failure, or structural concern, we can assess whether it relates to our original work and falls under warranty. For issues outside our scope, we refer you to licensed specialists in the Thousand Oaks area. If you are mid-construction with us and an urgent safety issue arises - a temporary wall compromised by wind, for example - our crew responds same day. Call (424) 395-4555 and we'll route your issue appropriately.

We provide a written workmanship warranty on every ADU we build in Thousand Oaks, with specific coverage periods for different systems: structural work, waterproofing, mechanical systems, and finishes. The exact terms are spelled out in your contract before construction starts, under Clause 1 of The Haven Standard. We also pass through manufacturer warranties on materials like James Hardie siding or roofing products. Our warranty is only as good as our documentation, which is why we photograph and record every critical detail during construction. Call (424) 395-4555 and we'll send our standard warranty terms for review.

The Haven Standard is our documented system for delivering every ADU with no surprises. It has five clauses: Have it in writing - flat price, written scope, written warranty before anyone starts; Arrive on schedule - a real window, a named lead, a text when we're on the way; Verified crews - licensed, insured, background-checked, with license numbers on the page; Evidence on every job - photos and readings of what we actually found; No surprises - no door upsell, no scope creep, no "while we're in here." We've applied this standard to over 900 ADUs since 2015. Call (424) 395-4555 to see how it works on your project.

Our workmanship warranty transfers to the new owner with proper documentation. We also provide a complete record of permits, inspections, and as-built drawings that Thousand Oaks requires for any future sale. This documentation has helped sellers in Moorpark and Simi Valley close smoothly when buyers' lenders asked for permit verification. We recommend keeping your Haven Standard packet with your other home records. Call (424) 395-4555 if you need replacement documentation.

Written by Nadia Ellery, Owner at Ellery ADU Studio Thousand Oaks, serving Thousand Oaks, Westlake Village, Oak Park, Moorpark, Agoura Hills, Simi Valley, Camarillo, Malibu, Calabasas, West Hills, Fillmore, and Canoga Park since 2015.