How to Find Out if Your Property is Eligible for an ADU
Before you start designing or budgeting for an accessory dwelling unit (ADU), the first step is confirming whether your property is eligible. The good news is that California law allows ADUs on most residential lots—but eligibility still depends on zoning, lot layout, and site conditions. At MF ADU, we help homeowners evaluate these factors early so they can move forward with clarity and confidence.
Check Your Property’s Zoning
Zoning is the foundation of ADU eligibility. Most properties zoned for residential use—single-family or multifamily—qualify for at least one ADU under California law.
Local zoning rules may still define:
Maximum ADU size
Height limits
Placement and setbacks
Understanding zoning early helps avoid designs that won’t be approved later.
Review Lot Size and Layout
While California does not impose minimum lot size requirements for ADUs, the physical layout of your property still matters. Factors such as yard space, existing structures, and access points influence where an ADU can be placed.
Even smaller or irregular lots often qualify with the right design approach.
Evaluate Setbacks and Placement Options
Setbacks determine how close an ADU can be built to property lines. These rules vary by city but often allow reduced setbacks compared to primary residences.
Placement options may include:
Detached backyard ADUs
Garage conversions
Attached ADUs connected to the main home
Each option has different eligibility considerations.
Understand Utility and Access Requirements
Your property must be able to support utility connections such as water, sewer, and electricity. In most cases, ADUs can connect to existing systems, but site-specific conditions may require upgrades.
Access for construction and emergency services is also reviewed during eligibility checks.
Why a Professional Review Helps
While city websites provide zoning information, interpreting the rules correctly can be challenging. A professional review ensures nothing is overlooked—saving time, redesigns, and delays.
At MF ADU, we evaluate zoning, setbacks, utilities, and site constraints together to give homeowners a clear answer before moving forward.
Did you know?
Did you know? Most California homeowners who assume their property is ineligible for an ADU are surprised to learn that state law still allows one with the right design and placement.
Get Clarity with MF ADU
Finding out if your property is eligible for an ADU doesn’t have to be complicated. At MF ADU, we help homeowners assess eligibility early and provide clear guidance on what’s possible—before design or budgeting begins.
If you’re unsure about your property, start by reaching out through our contact page to schedule an eligibility review.
Frequently Asked Questions
How do I know if my property qualifies for an ADU?
Start by checking zoning and lot layout, then confirm with a professional review.
Do small lots qualify for ADUs?
Yes. Many small or narrow lots are eligible with the right design.
Does having a garage affect ADU eligibility?
Yes. Garage conversions are a common and eligible ADU option.
Are utility upgrades required for all ADUs?
Not always. Many ADUs connect to existing utilities, depending on capacity.
Can MF ADU confirm my eligibility before design begins?
Yes. We review zoning, site conditions, and placement options before planning starts.