ADU Builder Brentwood.
Architect-led ADU design and permitting in Brentwood. Fixed-fee design, streamlined permits, and free site evaluations.
Our completed and upcoming projects near Brentwood, CA.
ADUs in Brentwood.
ADUs (Accessory Dwelling Units) are secondary housing units added to residential properties — versatile space for family, rental income, or added property value.
Perfect for Los Angeles County's housing needs, ADUs are a smart way to maximize your property's potential while helping address the region's housing shortage.
ADUs have become increasingly popular in Brentwood, as homeowners recognize their value for multigenerational living, rental income, or work-from-home spaces.
Recent California legislation has streamlined approvals, making now the ideal time to build.
Benefits of ADUs
Adding an Accessory Dwelling Unit to your property delivers substantial value in several ways:
Financial Returns
- Generate Rental Income: Earn money by renting out your ADU.
- Boost Property Value: Increase your home's market value by increasing the livable space of your home and giving it rental income potential.
Lifestyle & Family Solutions
- Multi-generational Living: Create independent living space for adult children or aging parents while maintaining privacy.
- Caregiver Accommodations: Provide nearby housing for childcare providers or health aides supporting family members.
Flexibility For Your Future
- Adaptable Space: Use your ADU as a home office, guest house, or rental—changing its purpose as your needs evolve.
- Aging in Place: Create an accessible living option to remain on your property as mobility needs change.
Schedule a free site visit to get started
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
ADU Regulations in Brentwood
Last updated 2026-05-27. Always verify with your local building department.
Full rules breakdown for BrentwoodADU Permits in LA County
Brentwood manages ADU permits through its own local building department. The figures below reflect LA County-wide permit activity as regional context.
| Year | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026* |
|---|---|---|---|---|---|---|---|---|---|
| Permits | 507 | 949 | 1,088 | 1,400 | 1,611 | 1,969 | 2,059 | 2,676 | 948 |
| Median valuation | $74k | $85k | $90k | $97k | $110k | $116k | $143k | $163k | $200k |
* Year-to-date
Source: LA County Building & Safety public permit records, deduplicated by case number (methodology). Explore the data →
ADU rules in Brentwood, answered.
Common questions about ADU permits, setbacks, fees, and timelines in Brentwood. Always verify with your local building department before submitting.
The maximum size for a detached ADU in Brentwood is 1,200 sq ft.
A licensed engineer on your lot, free.
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
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Explore all of our services.
One accountable team for every step of your ADU project — from initial sketches and city permits to financing, construction, and legalization.
ADU Design
Our ADU design team works closely with each client to create adaptable layouts that fit your site, lifestyle, and goals.
Learn more →ADU Building Permits
We manage every ADU building permit, drawing, document, and approval with your city and county — start to finish.
Learn more →Legalizing Unpermitted ADUs
We help you navigate the legalization process for your existing ADU, ensuring compliance and securing permits.
Learn more →ADU Construction
We oversee the full construction process with care, skill, and clear communication, turning your plan into a beautiful ADU.
Learn more →Prefab ADUs
Save money and build faster with a modular ADU. Factory-built, site-installed, and ready in months — not years.
Learn more →ADU Financing
We work with multiple ADU-specific lenders so you can find the right financing — HEA, HEI, HELOC, or construction-to-perm.
Learn more →