ADU in Westchester - 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 fully detached new builds, we handle every phase of your ADU project under one roof - design, permitting, site prep, and construction.
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 Westchester
A look at recent adu projects across Westchester and surrounding areas.
ADUs Built the Way Your Home Deserves
An ADU is one of the most significant investments you'll make in your property. We treat it that way. Our team brings the same level of care and craft to your accessory dwelling unit that a master builder would bring to a primary residence - because that's exactly what your family and future tenants deserve.
From the framing to the finish carpentry, every detail is executed with intention. We source quality materials, hire skilled tradespeople, and never rush work just to hit a deadline. The result is an ADU that feels like a natural, permanent part of your home - not an afterthought.
Start My ADU Project
Your Neighbors Know Our Work
Westchester homeowners have trusted us to expand their properties thoughtfully and responsibly. Our roots in the community mean we understand the neighborhood's architectural sensibility, the quirks of local zoning, and the standards your neighbors and the city expect.
When you work with us, you're not onboarding a distant contractor who'll disappear after the final check clears. You're partnering with a local team that's accountable, reachable, and proud of every project we put our name on.
Meet Our Team
What Homeowners Say
Projects across Westchester and surrounding communities.
"Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
"Detached unit in the back garden. Good design, good build quality, and the cost changes were documented and agreed in advance."
"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."
"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."
"Handled the whole planning process. We went to one hearing and that was it."
"Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
A Smooth, Transparent ADU Journey From Day One
We've refined every step of our process so you always know what's happening, what's next, and who to call - no guesswork, no surprises.
Free Discovery Consultation
We sit down with you - in person or virtually - to understand your goals, your property, and your timeline. There's no pressure, just a real conversation about what's possible on your lot.
Site Assessment & Feasibility
Our team visits your Westchester property to evaluate setbacks, utilities, zoning, and lot coverage. We give you an honest feasibility report before any money changes hands.
Custom ADU Design
Our designers create floor plans and elevations tailored to your lifestyle and your neighborhood's character. We balance beauty, function, and approvability from the very first draft.
Permit Expediting
We prepare and submit a complete permit package to the City of Los Angeles and handle all back-and-forth with plan checkers. Our familiarity with LA County ADU codes means faster approvals.
Site Preparation & Utilities
Before a single wall goes up, we coordinate grading, drainage, and utility connections - water, sewer, gas, and electrical - so construction starts on solid footing.
Construction & Craftsmanship
Our licensed crews build with care, keeping the jobsite clean and communicating progress updates weekly. We treat your property as if it were our own.
Inspections & Quality Walkthroughs
We schedule and pass every required inspection, and we conduct our own quality walkthrough before each milestone sign-off. Nothing moves forward until it meets our standards.
Final Delivery & Closeout
We hand you your certificate of occupancy, all warranties, and a complete project binder - then we stay available for any follow-up questions long after move-in day.
Six Dimensions of ADU Excellence
We hold every ADU we build to a rigorous standard across design, construction, and the homeowner experience.
Architectural Integrity
Every ADU is designed to complement your existing home's style and your street's character - never a generic box dropped on a lot. Good design adds lasting value.
Permit-Ready Plans
Our permit packages are thorough and code-compliant from the start, dramatically reducing revision cycles and keeping your project on schedule.
Licensed Craftsmanship
Every subcontractor on your project is licensed, insured, and vetted. We maintain direct relationships with our trade partners so quality never slips through the cracks.
Utility Coordination Expertise
Proper ADU utility work requires foresight and coordination across multiple agencies. We manage every connection - sewer, water, gas, and electrical - so you avoid costly surprises.
Transparent Pricing
You receive a detailed fixed-price proposal before work begins. No vague allowances, no change-order surprises - just honest numbers you can plan around.
On-Time Delivery
We build realistic schedules and staff projects to meet them. Our track record of on-time completions in Westchester speaks for itself.
Why Westchester Builds With Us
We combine the warmth of a family builder with the reliability and speed that Westchester homeowners need.
Westchester-Rooted Expertise
We know Westchester's zoning overlays, HOA considerations, and neighborhood expectations inside and out. That local knowledge translates directly into smoother permits and better-designed ADUs for your specific block.
One Team, Zero Hand-Offs
Design, permitting, site prep, and construction all live under one roof. You have a single point of contact from day one to certificate of occupancy - no finger-pointing, no coordination gaps.
Faster Permit Approvals
Our permit packages are built to city standards from the start. We've developed relationships with LA County plan checkers and know exactly what reviewers need, which keeps your project on schedule.
Craftsmanship You'll Be Proud Of
We build ADUs we'd be comfortable putting our own families in. Every finish, fixture, and framing detail is held to a standard that reflects the pride we take in our work - and the value we're adding to your property.
Frequently Asked Questions
Honest answers to the questions Westchester homeowners ask us most before starting their ADU journey.
Ready to Add Real Value to Your Westchester Home?
Let's talk about your property, your goals, and the ADU that makes the most sense for you. A free, no-pressure consultation is the first step - and we're ready when you are.
(213) 698-7591Get Your Free ADU Estimate
Tell us a little about your project and we'll reach out within one business day to schedule your free site consultation.
ADU Service Across the Westchester Area
We Are the Westchester 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.