- Downey, CA
- Licensed, Insured & Bonded
- 1-Year Workmanship Warranty
ADU BuilderIn Downey, CAAnd Los Angeles County
NewGen ADU Builders designs and builds accessory dwelling units for homeowners and investors in Downey, from garage conversions to new detached units. Downey is about six miles northwest of Cerritos, an easy drive for site visits and daily check-ins. Every project is licensed, insured and bonded, and backed by a 1-year workmanship warranty.
- 1-Year
- Workmanship Warranty
- 3–6
- Month Build Timelines
- Based
- Minutes Away in Cerritos
01 — Services
What We Build in Downey
Every ADU service we offer is available in Downey. Its larger lots and established homes give homeowners room for a detached ADU or an attached unit without crowding the main house. We design and build the unit to fit the lot, the main house, and the budget you set.
- 01
Garage Conversion
Turn an existing garage into a finished living unit with its own kitchen, bath, and entrance. Often the fastest route to an ADU on a Downey lot because the structure already exists.
Learn More - 02
Storage Room Conversion
Convert a workshop, storage building, or similar structure into a complete ADU after an honest on-site assessment.
Learn More - 03
New Ground-Up ADU Construction
Build a new unit from the foundation up when no existing structure fits or you want a specific layout.
Learn More - 04
Detached ADU
A standalone backyard home offering the most privacy for tenants or family.
Learn More - 05
Attached ADU
A new unit that shares a wall with your home, a strong fit for Downey lots without room for a separate structure.
Learn More
02 — Local Market
ADUs in Downey:The Local Numbers
Downey homeowners are building ADUs, and the public record shows it. These are the city's own home value, rent, and permit numbers, plus what appraisal research says ADUs add.
$878,882
Typical Downey home value
Zillow Home Value Index, August 2026
+19.4%
Change in typical home value over five years
Zillow Home Value Index, August 2021 to August 2026
$2,305
Typical monthly rent in Downey, all rentals
Zillow Observed Rent Index, August 2026
842
ADU building permits issued in Downey, 2021 to 2025, as reported to the state
California HCD Annual Progress Reports
What the research shows
Statewide, appraisal data from the Federal Housing Finance Agency shows California properties with an ADU had a median appraised value of $1,064,000 in 2023, against $715,000 for properties without one. FHFA notes the higher growth in appraised value for properties with ADUs requires further analysis, so this is a comparison of medians, not a promise for any one home. A peer-reviewed study of Los Angeles found that ADU presence raises a parcel's assessed value and selling price by 7% to 9%. Both are statewide or City of Los Angeles figures, not Downey-only numbers, and Downey is in Los Angeles County.
What the local record shows
Typical home values in Downey are up 19.4% over five years, and typical rent is $2,305 a month. Of the ten cities in our service area, Downey has the second-lowest typical monthly rent. Downey reported ADU building permits issued every year from 2021 to 2025: 123, 137, 141, 295, and 146. That is 842 in total.
See the City of Downey's pre-approved detached ADU plansSources · data retrieved 2026-09-21
- Zillow Research — Home Value Index and Observed Rent Index for Downey, CA, data through August 2026, and the same series for the other nine service-area cities used in the comparison
- California HCD — Housing Element Annual Progress Reports, Table A2, ADU building permits issued in Downey, 2021 to 2025, by permit issue date with repeat reports removed
- FHFA — Trends in Median Appraised Value for Properties With ADUs in California, published 2025-01-02
- Brueckner and Thomaz — ADUs in Los Angeles: Where are they located and by how much do they raise property value? Real Estate Economics, 2024
- City of Downey — Pre-Approved Standard Plans For Detached Accessory Dwelling Units
03 — Process
How It Works in Downey
- 01
Short Intake Interview
Text, call, or send the form. We ask about your Downey property, your goals, and your budget so we arrive prepared.
- 02
On-Site Visit
We come to your property in Downey, walk the lot, and talk through which type of ADU fits your space and budget.
- 03
Design & Written Estimate
We turn the visit into a plan and a written estimate showing exactly what is included. You approve before work starts.
- 04
Build & Handoff
Construction runs 3 to 6 months. We keep you updated, walk the finished unit with you, and back it with a 1-year workmanship warranty.
04 — Why Choose Us
Why DowneyHomeowners Choose Us
Based Minutes Away in Cerritos
Downey is about six miles northwest of Cerritos, an easy drive for site visits and daily check-ins. Site visits are easy to schedule and we are close by throughout the build.
Licensed, Insured & Bonded
Your property is protected throughout the build, and documentation is available on request.
Honest, Transparent Pricing
Most projects fall between $150,000 and $200,000, and we tell you where yours lands before you commit.
1-Year Workmanship Warranty
If anything we built needs attention in the first year, we come back and fix it.
ADUs Are All We Do
Garage conversions, storage conversions, and new attached and detached units are our entire business.
05 — Get Started
Ready to Start Your ADUin Downey?
Reach out and we will schedule a short intake call, then come to your Downey property for a free on-site visit and written estimate.
- Free on-site estimates in Downey
- Licensed, insured and bonded
- 1-year workmanship warranty
- Text us at (562) 308-6040
06 — FAQ
Common Questions from DowneyHomeowners
Do you serve all of Downey?
Yes. Downey is well inside our 30-mile range from Cerritos, and we serve every neighborhood, including North Downey, Northwest Downey, and the neighborhoods around Downey Landing.
How soon can you visit my property in Downey?
We start with a short intake call, then schedule the on-site visit. Because Downey is close to our Cerritos home base, visits are easy to fit in. The call and visit are free and carry no obligation.
How much does an ADU cost in Downey?
Our projects run between $150,000 and $200,000. Conversions sit at the lower end and new detached construction at the upper end. You get a written estimate after the on-site visit.
How do I get started if I am in Downey?
Text or call (562) 308-6040 or send the form. We set up a short intake call, then schedule your on-site visit.
07 — Service Area
Serving Downey andSurrounding Areas
Downey is one of the nine cities closest to our Cerritos headquarters, and part of the Los Angeles County side of our range. Near the edge of our range? Text us and we will confirm.
ADU Builder in Downey, CA· This page
Based in Cerritos and proud to serve Downey. Get your free ADU estimate today.