Nestadu

100 Shoreline Highway, 94941, Mill Valley, CA

Nestadu is a full-service ADU builder offering custom site-built and prefab accessory dwelling units. Prefab models range from $115K–$317K. Custom builds start at $400/sq ft. Financing options include HELOCs, construction loans, and CA grants.

Nestadu, Mill Valley, CA

About Nestadu

Nestadu: Full-Service ADU Design, Permitting, and Construction

Nestadu is a comprehensive ADU builder and ADU contractor that handles every stage of the process — from design and permitting through to final construction. As an experienced accessory dwelling unit builder, they serve a wide range of budgets, property types, and design preferences, offering both site-built custom ADUs and prefabricated units delivered fully assembled to the backyard.

Their team brings extensive construction experience, having built hundreds of homes and delivered significant project value. Whether a homeowner is looking for a compact studio or a fully equipped two-bedroom unit, Nestadu provides a structured, straightforward, and hassle-free path to adding an ADU to their property.

Custom and Prefab ADU Options

Nestadu offers two primary pathways for homeowners interested in building an accessory dwelling unit:

  1. Custom Site-Built ADUs: These are constructed directly on the property to meet the homeowner's exact specifications. Clients can choose from nine signature architectural styles or work with Nestadu's design team to create something entirely unique. Pricing for custom builds starts from $400 per square foot, with a typical timeline of 8–10 months.
  2. Prefab ADUs: These are pre-designed, factory-built units delivered fully assembled to the backyard. They offer a faster and often more cost-effective alternative to site-built construction, with elegant and customizable designs available across multiple floor plan options.

As a backyard cottage builder and detached ADU builder, Nestadu's prefab lineup includes several models suited to different needs and budgets:

  1. Nest (200 sq. ft.): A versatile studio with 1 bath, starting from $115,000. Ideal as a backyard office or additional living space.
  2. Nest Studio (330 sq. ft.): A studio with full bath and modern kitchen, from $225,000 or approximately $1,500/month.
  3. Nest One (497 sq. ft.): A 1-bedroom, 1-bath unit with a full kitchen, from $263,000 or approximately $1,950/month.
  4. Nest Two (638 sq. ft.): A 2-bedroom, 1-bath unit with full kitchen and laundry, from $317,000 or approximately $2,800/month.

Each prefab model is designed with bright, spacious interiors and is delivered fully assembled, making Nestadu a compelling choice as a granny flat builder or in-law suite builder for families seeking comfortable, self-contained living arrangements.

Architectural Styles and ADU Financing

For those pursuing a custom site-built ADU, Nestadu offers a broad range of architectural styles to complement any home aesthetic. These include timeless, modern, rustic, Mediterranean, minimalist, and contemporary designs, among others. If none of the pre-designed styles fit a homeowner's vision, their design team is available to craft a fully bespoke solution.

Nestadu also provides guidance on ADU financing options to help homeowners fund their project. The most commonly explored options include:

  1. Home Equity Loan or HELOC — leveraging existing home equity through a fixed loan or flexible credit line.
  2. Cash-Out Refinance — refinancing an existing mortgage to access additional funds, often at lower interest rates.
  3. Construction Loan — suitable for those with limited equity, based on the home's projected post-improvement value.
  4. Personal Loans or Credit — an option for those without significant savings or equity, though typically at higher interest rates.
  5. Hard Money Loans — flexible short-term financing from private lenders, suited to real estate investors.
  6. Government Programs and Grants — including California-specific programs such as CalHome and LEAP grants, as well as nationwide HUD programs.
  7. Alternative Financing — including peer-to-peer lending and equity investment platforms.

With a combination of quality craftsmanship, diverse design options, transparent pricing, and financing support, Nestadu positions itself as a well-rounded ADU contractor for homeowners looking to add lasting value to their property.

Services

Nestadu performs the following services

  • Architecture & Design
  • Permit Specialist
  • Construction
  • Financing & Loans
  • Feasibility & Site Assessment
  • Finishing & Fit-out
  • 3D renderings & floor plans

Nestadu Reviews

Stephen Reid

2025-02-08
"Nestadu did a great job on my backyard ADU. Their team was professional, and the final result looks fantasticwell-built and blends in nicely with my home. Pricing was clear, and there were no surprise costs, which I really appreciated. Ive already rented it out, and my tenant is really happy with the space. The process took a little longer than expected due to permits, but Nestadu kept me updated along the way. Overall, Id definitely recommend them if youre considering an ADU!"

Malcolm McVickar

2024-06-24
"One of the talents of the NestADU team that I appreciated the most was their ability to LISTEN! I wanted to create a custom 850 sq.ft. ADU on my property next to my house and we had to deal with a narrow site with a steep sloping back yard, so this wasnt any place for a drop-ship prefab. Everything had to be custom-designed for my aging grandmother. Bret and John were able to take my thoughts and my Grandmothers preferences and turn them into a very detailed, creative solution that met our requirements and create a set of drawings that got us our permit on our first submittal!"

Hubert Yoshida

2024-06-11
"My wife and I have been married for 60 years and were looking to build an ADU on our sons property in central California. I have cancer and was looking to provide a home where my wife would be comfortable in the event that she would have to go on without me. We needed to find a contractor who we could trust to put together a complete package, would be responsive, offer custom options to fit our needs, and be sensitive to our family dynamics since it involved my son. We talked to several contractors, and found the process to be overwhelming. Finally, we contacted John Westcott, COO of Nestadu. We met him on a zoom call and he was very warm. understanding, clear, and professional. Later he and the CEO, Bret Ashworth, showed us an ADU that they had built on a lot in Novato, and came out to our site to verify its suitability. All this was done in a week! We had problems with the site but we would definitely use Nestadu when it comes to building an ADU."

MGM

2024-06-07
"Very easy to work with. Transparent pricing and quality craftsmanship. 55."

Fran John

2024-06-07
"Customer service is excellent! Seamless process! I am very pleased with the final outcome of my new ADU."

Specifics

Luxury Builds

Opening hours

Monday 9:00AM - 5:00PM
Tuesday 9:00AM - 5:00PM
Wednesday 9:00AM - 5:00PM
Thursday 9:00AM - 5:00PM
Friday 9:00AM - 5:00PM
Saturday -
Sunday -

Location

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