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Location and Projects

Address
100 Shoreline Hwy, Mill Valley, CA, 94941
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Nestadu Construction

Founded in Mill Valley, CA by two lifelong friends and construction veterans, Nestadu emerged from a shared vision to improve the residential construction experience for California homeowners. Disappointed by uninspired designs and cumbersome processes, we set out to offer superior solutions in ADUs, custom homes, and renovations.

At Nestadu, we are passionate about thoughtful design and quality craftsmanship. Our projects are designed to enhance both the beauty and practicality of your home.

Whether you’re expanding for rental income, building your dream home, or renovating to upgrade your living space, Nestadu ensures a smooth, hassle-free experience that exceeds expectations and adds lasting value.

From BuildZoom: Nestadu LLC, 100 Shoreline Hwy, Mill Valley, CA (Employees: Bret Ashworth and John Westcott) holds a General Building license according to the California license board.

Their BuildZoom score of 120 ranks in the top 1% of 336,931 California licensed contractors.

Their license was verified as active when we last checked. If you are thinking of hiring Nestadu LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.

Nestadu LLC Contact Information

Phone: (415) 879-9660
Address: 100 Shoreline Hwy, Mill Valley, CA 94941

Nestadu LLC Mill Valley

Quality

120
99th percentile
How is the BuildZoom score calculated?
Pro tip: We generally recommend hiring a contractor with a score higher than 95.
Nestadu LLC has a BuildZoom score of 120, which places them above 99% of 336,931 contractors in California.

Activity

3 projects
 2025
1 project
 2024
Our building permit records indicate that Nestadu LLC has worked on at least 4.0 projects over the past 2 years.

This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.

Pricing

1 project
 < $5k
1 project
 $5k-$20k
1 project
 $100k-$250k
Value Not Public: 2.0 projects
Pro tip: For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.

Nestadu LLC Reviews
5 out of 5 stars, based on 4 reviews

  • By Jack
    November 26, 2024
    Kitchen Model
    $200

    Very Good Contractor I recommend this to everyone for homes
  • By Megan W.
    June 11, 2024

    Nestadu built and installed our prefab ADU and we absolutely love it. Bret and John are amazing to work with, extremely professional and super responsive. They customized the unit perfectly to our needs, even finding the right paint color to match our home. The entire process took just over 6 months.  We had one issue with a couple broken light fixtures damaged in transit, which they quickly addressed. Highly recommended!
  • By A. W.
    June 10, 2024

    Have built numerous homes with the Founder and always the same results—a class act, beautiful homes and happy homeowners.
  • By Admiral S.
    May 22, 2024

    I have known Bret for 15 years since our time at Stanford. Over the years, he has proven himself to be an exceptional home builder. His dedication to quality, attention to detail, and unwavering reliability make him stand out in the industry. I highly recommend Bret for any building project, confident that he will deliver outstanding results with integrity and professionalism.

    Admiral Keith B. Taylor, SCPM
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Building Permits by Nestadu LLC

Sort by: Notable Notable | Date Date | Job Value Job Value

This is a sample of this contractor's permits. Click here to access their complete permit history.

Building - pre application
1440 5th St, Alameda, CA, 94501
2025-09-22
Demolish existing detached garage structure. construct conditioned crawl space foundation with stem walls and perimeter footings. install prefabricated adu unit (200 sq ft) with utility connections including water sewer electrical and gas. complete all final connections and finish work to create new habitable dwelling unit. all work per approved plans and city of alameda adu ordinance
Valuation:
$175,000
Permit #:
PREBLD25-0791
Status:
approved
Fee:
$121
Permit Type:
N/A
Building Type:
N/A
New construction
206 William Ave, Larkspur, CA, 94939
2024-03-20
Build an 800 sq ft 3 bedroom and 2 bath attached adu
Valuation:
N/A
Permit #:
BD2403-0022
Status:
N/A
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Remodeling
206 William Ave, Larkspur, CA, 94939
2024-10-01
2nd story addition
Valuation:
$200
Permit #:
PLN24-046
Status:
N/A
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Residential addition
206 William Ave, Larkspur, CA, 94939
2025-05-20
New 2nd fl addition w full remodel of 1st fl w/mep
Valuation:
N/A
Permit #:
BD2403-0022
Status:
issued
Fee:
$30,779
Permit Type:
N/A
Building Type:
N/A
Residential - miscellaneous
1440 5th St, Alameda, CA, 94501
2025-11-03
Demolish existing detached garage structure for adu. (bldg) **sharing plans with adu25-0061**
Valuation:
$10,000
Permit #:
B25-0291
Status:
applied
Fee:
$1,318
Permit Type:
N/A
Building Type:
N/A
Building - accessory dwelling unit
1440 5th St, Alameda, CA, 94501
2025-11-03
***for certificate of occupancy** construct conditioned crawl space foundation with stem walls and perimeter footings. install prefabricated adu unit (200 sq ft) with utility connections including water sewer electrical and gas. complete all final connections and finish work to create new habitable dwelling unit. all work per approved plans and city of alameda adu ordinance.subpanel. ... see more
Valuation:
$165,000
Permit #:
ADU25-0061
Status:
applied
Fee:
$8,890
Permit Type:
N/A
Building Type:
N/A
Addition
65 Treehaven Dr, San Rafael, CA, 94901
2025-03-18
Construction of a new 706 sq. ft. accessory dwelling unit (adu)
Valuation:
N/A
Permit #:
B2412-057
Status:
N/A
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential