✅ General Questions

What is an ADU?
An Accessory Dwelling Unit (ADU) is a self-contained residential unit located on the same lot as a single-family or multi-family home. Commonly known as in-law units, granny flats, or backyard cottages, ADUs provide flexible living space and long-term rental potential.

What types of ADUs are allowed in California?

• Detached ADU – Standalone structure separate from the main house

• Attached ADU – Shares a wall with the primary residence

• Conversion ADU – Repurposed space, like a garage or basement

• Junior ADU (JADU) – Up to 500 sq. ft., located within the existing home with its own entrance and kitchenette

Why are ADUs popular in California?
ADUs help meet the state’s housing needs, generate rental income, support multigenerational living, and increase property value.

🛠️ Design & Construction

Can I build an ADU on my property?
Most single-family and multi-family lots in California are eligible for at least one ADU and one JADU. Local zoning codes apply, but statewide laws limit how restrictive they can be.

How large can my ADU be?

• Detached: Up to 1,200 sq. ft.

• Attached: Up to 50% of the primary home’s size

• JADU: Max 500 sq. ft.

Do I need a permit to build an ADU?
Yes. You must obtain permits from your local building department. California law requires cities to approve compliant ADU plans within 60 days.

How long does it take to build an ADU?
On average, 6–12 months depending on design, permitting, and construction timelines.

💵 Cost & Financing

How much does it cost to build an ADU in California?
Typical costs range from $150,000 to $400,000+ depending on size, materials, and site conditions.

Are there financing options available?
Yes. Homeowners may qualify for:

• Home equity loans or HELOCs

• Cash-out refinancing

• Construction loans

• CalHFA ADU Grant Program (up to $40,000 for eligible homeowners)

Will building an ADU increase my property taxes?
Only the ADU portion will be reassessed. Your main home’s assessed value remains unchanged.

🏘️ Rental & Use

Can I rent out my ADU?
Yes. Long-term rentals (30 days or more) are allowed statewide. Short-term rentals (Airbnb, etc.) are regulated by local jurisdictions.

Do I need to live on the property?
For ADUs approved before January 1, 2025, owner-occupancy is not required. However, some cities may reinstate that requirement after that date.

Can I use my ADU for Airbnb or short-term rentals?
It depends. Check with your city or county to see if short-term rentals are allowed in ADUs.

📜 Legal & Zoning

What California laws support ADU construction?
State legislation like AB 68, AB 881, and SB 9 have streamlined the ADU approval process and removed many zoning barriers.

Can I build more than one ADU?
Yes. Most single-family lots can have:

• 1 ADU + 1 JADU
  Multi-family properties may qualify for 2 detached ADUs plus conversions of existing non-living spaces (e.g., storage rooms, garages).

Are parking spaces required for ADUs?
In many cases, no. Parking is not required if:

• The ADU is within ½ mile of public transit

• It’s part of a garage conversion

• The lot is in a historic or car-free zone

Still Have Questions?

Whether you're a homeowner, builder, or investor, we can help guide you through California’s ADU process—from planning and permitting to construction and marketing. Contact us to get started!