ADU in Thousand Oaks - One Fixed Price, Permits Handled
We handle the design, the engineering, and the city permit, then build it. One contract, one crew, one accountable point of contact. Free feasibility check on your lot before you commit.
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Our ADU Services
From garage conversions and junior ADUs to brand-new detached guest homes, we handle every phase of your ADU project - design, permitting, site prep, and construction - all under one trusted roof.
ADU Design & Permitting
Professional adu design & permitting service. Licensed & insured with a satisfaction guarantee on every job.
ExploreGarage Conversion ADU
Professional garage conversion adu service. Licensed & insured with a satisfaction guarantee on every job.
ExploreNew Detached ADU
Professional new detached adu service. Licensed & insured with a satisfaction guarantee on every job.
ExploreJunior ADU & Interior Conversion
Professional junior adu & interior conversion service. Licensed & insured with a satisfaction guarantee on every job.
ExploreADU Site Prep & Utilities
Professional adu site prep & utilities service. Licensed & insured with a satisfaction guarantee on every job.
ExploreOur Work in Thousand Oaks
A look at recent adu projects across Thousand Oaks and surrounding areas.
An ADU Built to Be Proud Of - Not Just to Check a Box
In Thousand Oaks, where neighborhoods are established and neighbors are close, the way your ADU looks and lasts matters. We don't treat ADUs as production-line builds. Every project gets the same attention to detail we'd give our own homes - because our reputation in this community depends on it.
From the materials we select to the trades we trust, every decision is made with longevity and livability in mind. The result is an accessory dwelling unit that adds genuine value to your property and genuine comfort to whoever calls it home.
Start My ADU Project
Thousand Oaks Homeowners Trust Us to Deliver - On Time, On Budget
Speed and reliability aren't just promises we make - they're disciplines we practice. Our permit team knows Thousand Oaks municipal requirements inside and out, which means fewer revision cycles, faster approvals, and a construction start date you can actually count on.
When you work with us, you're not handing your project to a distant contractor who shows up late and communicates rarely. You're partnering with a local team that answers the phone, shows up when we say we will, and treats your home with the respect it deserves.
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What Homeowners Say
Projects across Thousand Oaks and surrounding communities.
"Handled the whole planning process. We went to one hearing and that was it."
"Detached unit in the back garden. Good design, good build quality, and the cost changes were documented and agreed in advance."
"Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
"They walked us through setbacks and utility capacity before we paid anything, and told us one of our two options was not going to get approved."
"Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
"The rental income has covered the payment since the second month. They were realistic about the numbers rather than optimistic."
"The permit set and the build were one contract with one number. Our neighbours used two firms and spent a year watching them blame each other."
Your ADU Journey, Made Simple and Stress-Free
We've refined every step of the ADU process so you always know what's happening, what's next, and exactly who to call.
Free Discovery Call
We start with a friendly conversation about your goals, your property, and your timeline. No pressure - just honest answers and real numbers.
Site Evaluation & Feasibility
Our team visits your Thousand Oaks property to assess setbacks, utility connections, soil conditions, and zoning rules so there are no surprises later.
Custom ADU Design
Our in-house designers create a floor plan tailored to your lifestyle and lot - functional, beautiful, and optimized for fast city approval.
Permit Application & Filing
We prepare and submit a complete permit package to the City of Thousand Oaks, handling every revision and agency response on your behalf.
Site Prep & Utilities
Before the first wall goes up, we coordinate grading, drainage, and all utility connections - electrical, plumbing, and gas - to code and on schedule.
Construction & Framing
Our licensed craftsmen build your ADU with quality materials and meticulous attention to detail, keeping you updated at every milestone.
Inspections & Punch List
We schedule and pass all required city inspections, then walk the finished space with you to address every last detail before you take the keys.
Final Delivery & Warranty
We hand over a fully permitted, move-in-ready ADU backed by our workmanship warranty - and we're still just a phone call away.
What Sets Our ADUs Apart in Thousand Oaks
Every ADU we deliver is measured against six quality dimensions that matter most to homeowners and long-term value.
Permitted & Code-Compliant
Every ADU we build is fully permitted through the City of Thousand Oaks and meets all California Title 24 energy and building code requirements - protecting your investment for decades.
Thoughtful Space Design
We design each ADU to live larger than its square footage suggests, with smart layouts, natural light, and finishes that feel like a real home - not an afterthought.
Reliable Project Timelines
We set honest construction schedules and hold to them. Our project management process keeps subs coordinated, inspections booked, and your build moving forward without unnecessary delays.
Quality Craftsmanship Throughout
From foundation to roofline, our licensed carpenters, framers, and finish tradespeople take pride in every joint, seam, and surface - because you'll be living with this work for years.
Full Utility Integration
We handle water, sewer, electrical, and gas connections from the main structure or street with properly engineered plans - no improvised solutions that cause headaches down the road.
Transparent Communication
You'll never wonder what's happening on your project. We provide regular progress updates, clear change-order documentation, and a direct line to your project lead at all times.
Why Thousand Oaks Builds With Us
We combine local expertise, fast permitting, and genuine craftsmanship to make your ADU project feel as smooth and rewarding as the finished space itself.
Fast Permit Navigation
We know exactly what Thousand Oaks requires and prepare complete, accurate permit packages the first time - dramatically reducing the back-and-forth that slows most ADU projects down.
True In-House Expertise
Design, permitting, site prep, and construction all happen under one roof with one accountable team - eliminating the finger-pointing that plagues projects split across multiple contractors.
Honest, Transparent Pricing
You'll receive a detailed, itemized estimate with no hidden fees. If something changes during construction, we discuss it with you before we act - always.
Workmanship You Can Count On
Every ADU we build is backed by a workmanship warranty and constructed by licensed tradespeople who take personal pride in the quality of what they leave behind.
Frequently Asked Questions
Straight answers to the questions Thousand Oaks homeowners ask us most before starting their ADU project.
Your Thousand Oaks ADU Starts with One Conversation
Let's talk about your property, your goals, and the fastest way to get a beautiful, permitted ADU built on your lot. Estimates are free, timelines are honest, and we're ready when you are.
(424) 395-4555Get Your Free ADU Estimate Today
Tell us a little about your project and we'll follow up quickly with honest answers and a clear path forward.
ADU Service Across the Thousand Oaks Area
We Are the Thousand Oaks Team for Ellery.
Ellery was founded in 2015, the year California's ADU law changed and the permitting queue became the actual product. It is a design-build studio rather than a contractor: the drawings, the permit set and the build are one contract with one price, because the ADU projects that go wrong are almost always the ones where the designer and the builder can each blame the other.
Same training, same parts, same pricing practice, and the same 365-Day Done Right Promise - delivered by people who live here.
Visit Ellery →Part of the Haven Family.
Haven is a family of home-service brands held to one written standard, and Ellery is the adu company in it. One promise stands behind every trade, in every town.