California / Builders / Nest Builders
Licence verified, no local permit history
CSLB #1117837 · NEST BUILDERS · Limited Liability
Design-build ADU contractor based in Mill Valley. Builds detached ADUs, attached ADUs, garage conversions, junior ADUs and manufactured ADUs, built both on site and in a factory. Published prices start at $115,000. Says it serves 4 California cities.
No ADU permits are on file under this licence in the cities we cover. Most California cities do not publish the contractor's name on a building permit, so this usually reflects what a city discloses rather than what a builder has built. Ask them directly for recent addresses and permit numbers you can look up.
Exempt from workers’ compensation is lawful and is not the same as suspended. A licensee with no employees may declare exemption. But if anyone is injured on your property while working on the job, exemption is the point at which a homeowner can become the employer of record. Ask who carries coverage for the crew and for every subcontractor before signing.
| City | Standing | ADU permits | Pre-approved plans |
|---|---|---|---|
| Concord | Licensed | none | no |
| Danville | Licensed | none | no |
| Fremont | Licensed | none | no |
| Los Angeles | Licensed | none | no |
| Mountain View | Licensed | none | no |
| Palo Alto | Licensed | none | no |
| Pasadena | Licensed | none | no |
| Sacramento | Licensed | none | no |
| San Diego | Licensed | none | no |
| San Jose | Licensed | none | no |
| San Ramon | Licensed | none | no |
| Santa Clara | Licensed | none | no |
| Santa Monica | Licensed | none | no |
| Walnut Creek | Licensed | none | no |
Nest Builders trades as Nestadu and covers Los Angeles from a Mill Valley base, working across the Bay Area, Sacramento, Los Angeles and San Diego. It offers both site-built custom ADUs and factory-built prefab units, and handles design, permitting and construction management. Junior ADUs, garage conversions and attached and detached units are all part of the offering.
The company’s own description · licence shown on their advertising matches the state register
| Model | Sq ft | Bed | Bath | From |
|---|---|---|---|---|
| Nest | 200 | 1 | $115,000 | |
| Nest Studio | 330 | 1 | $225,000 | |
| Nest One | 497 | 1 | 1 | $263,000 |
| Nest Two | 638 | 2 | 1 | $317,000 |
Starting prices for a base model. They rarely include site work, utility connections, or city fees. Get a written quote against a drawing set before comparing builders on price.
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ADU Standards does not issue zoning determinations and does not endorse contractors. Licence details are from the California Contractors State License Board, checked 2026-08-15. A city that pre-approves a plan has vetted the plan, not the builder. Always confirm licence standing at cslb.ca.gov before you sign anything.