Custom ADU Design & Construction in Mill Valley
Upgrade your property with a thoughtfully designed ADU. Sidex manages planning, construction, and project coordination to deliver beautiful, functional living spaces built for Mill Valley homeowners.
4.9/5 rating from 56+ online reviews.
Building a Mill Valley ADU That Fits the Way You Live
Mill Valley homeowners value good design. Whether it’s preserving the character of a hillside property, improving functionality, or making better use of available land, every improvement should feel intentional.
That’s why ADUs have become one of the most practical investments for Bay Area properties. A well-designed ADU can enhance the usability of your home while blending naturally with the surrounding architecture and landscape. As experienced ADU builders in Mill Valley, Sidex provides complete project support. Our team understands the unique challenges that come with ADU construction in Mill Valley, including lot constraints, elevation changes, and local permitting requirements.
Custom ADU Services in Mill Valley
Detached ADUs
Attached ADUs
Granny Flats
Backyard Cottages
In-Law Suites
Garage Conversions
Prefab ADUs
Custom ADU Services in Mill Valley
Detached ADUs
Attached ADUs
Granny Flats
Backyard Cottages
In-Law Suites
Garage Conversions
Prefab ADUs
Custom ADU Services in Mill Valley
Detached
ADUs
Attached
ADUs
Granny
Flats
Backyard Cottages
In-Law
Suites
Garage Conversions
Prefab ADUs
Structural Excellence & Outdoor Integration in Mill Valley
Exceptional ADU projects start with strong construction expertise. Our gallery features outdoor living and structural projects, reflecting attention to detail, craftsmanship, and project execution that defines every ADU we build in Mill Valley and the Bay Area.
FAQs About ADUs in Mill Valley
What is an ADU?
An ADU, or accessory dwelling unit, is a secondary residential structure located on the same property as a primary home.
Why are ADUs popular in Mill Valley?
Many homeowners choose ADUs to create additional usable space while preserving the character and location of their existing property.
Do you handle permits and planning?
Yes. Our team assists with project planning, permitting coordination, and key steps throughout the construction process.
What types of ADUs do you build?
We build detached ADUs, attached ADUs, granny flats, backyard cottages, garage conversions, and prefab ADUs.
Can an ADU increase property value?
A professionally designed and constructed ADU can improve property flexibility and long-term market appeal.
Why choose Sidex for ADU construction?
As trusted ADU contractors in Mill Valley, we combine thoughtful design, quality craftsmanship, and a streamlined building process.