Accessory Dwelling Unit (ADU) Construction Services in Marin County, CA


HH Construction Inc., based in Novato, CA, proudly offers expert construction services for Accessory Dwelling Units (ADUs) throughout Marin County and the surrounding areas. With over 13 years of experience in residential construction and remodeling, we specialize in building high-quality ADUs that maximize your property’s potential while providing versatile living spaces tailored to your needs.
What Is an Accessory Dwelling Unit (ADU)?
An accessory dwelling unit, commonly known as an ADU, is a secondary living space located on the same lot as a primary residence. ADUs can take many forms, including detached guest houses, converted garages, basement apartments, or attached living units. These versatile structures offer homeowners the flexibility to add functional space without the need for a full-scale home addition.
Whether used as a rental unit, guest quarters, home office, or multi-generational living space, ADUs provide an innovative and efficient way to increase living space while maintaining the character and flow of your primary home.
Benefits of Building an ADU
Constructing an ADU comes with numerous advantages that make it a popular choice for homeowners looking to optimize their property:
Additional Income Potential: Renting out your ADU can provide a steady source of supplemental income, helping to offset mortgage costs or other expenses.
Increased Property Value: Adding a well-built ADU enhances your home’s overall market value and appeal to future buyers.
Flexibility for Family Needs: ADUs offer a comfortable space for aging parents, adult children, guests, or caregivers, promoting independent living while staying close to family.
Efficient Use of Land: Rather than expanding the footprint of your home, ADUs maximize existing space on your lot, preserving outdoor areas and neighborhood aesthetics.
Sustainable & Cost-Effective Living: Smaller living spaces tend to be more energy-efficient, reducing utility costs and environmental impact compared to building a traditional larger home addition.
Our ADU Construction Process
HH Construction Inc. guides you through every phase of your ADU project—from initial design and permitting to construction and final inspection. Our experienced team works closely with you to customize your ADU according to your functional requirements, style preferences, and budget. We handle all aspects of the build, including plumbing, electrical, HVAC, and interior finishes, ensuring the highest standards of quality and code compliance.
Frequently Asked ADU Questions
How long does it take to build an ADU?
The timeline for ADU construction varies depending on design complexity and permitting processes but typically ranges from 4 to 9 months. We work diligently to provide accurate timelines and keep your project on schedule.
Do I need special permits to build an ADU?
Yes, ADU construction requires permits that comply with local zoning and building regulations. HH Construction Inc. assists you throughout the permitting process to ensure all approvals are in place before construction begins.
Can an ADU be used as a rental property?
Absolutely. Many homeowners build ADUs specifically as rental units to generate extra income. We ensure the unit meets all legal and safety requirements for rental properties.
Request Your Estimate
If you’re interested in expanding your living space and increasing your property’s value with a professionally built accessory dwelling unit, contact HH Construction Inc. today. Let us help you design and construct an ADU that perfectly fits your lifestyle and goals.

