City of National City
ADU Regulations in National City.
Everything you need to know about building an ADU in the City of National City. Updated for 2025.
ADU Requirements for National City
The City of National City has its own municipal code governing ADU construction. National City follows state ADU guidelines and encourages ADU development to increase housing supply.
Maximum Size
1,200 SF (detached) / 1,000 SF (attached)
Height Limits
24 feet / 16 feet
Setback Requirements
4 ft side and rear
Parking Requirements
No additional parking
Owner Occupancy
Not required
Allowed ADU Types
Detached ADU, Attached ADU, JADU, Garage Conversion
Design Standards
Standard building code compliance
Fees & Impact Charges
Reduced for ADUs
Building in National City?
Our team knows National City inside and out. We'll handle the entire permitting process so you don't have to.
Free Feasibility Check (858) 788-3839Why CRS for National City:
Frequently Asked Questions
How long does it take to build an ADU in National City? expand_more
The typical timeline for an ADU project in National City is 3–6 months for permitting, followed by 3–6 months of construction. Total project timeline from first meeting to move-in is typically 9–18 months.
How much does an ADU cost in National City? expand_more
ADU costs in National City typically range from $150,000 to $350,000+ depending on size, finishes, and site conditions. CRS Builders provides transparent, fixed-price contracts so you know exactly what you'll pay before construction begins.
Can I rent out my ADU in National City? expand_more
Yes. California law prohibits short-term rentals (under 30 days) for ADUs, but long-term rentals are permitted. There is no owner-occupancy requirement, meaning you can rent out both the main home and the ADU.
Do I need a permit to build an ADU? expand_more
Yes, a building permit is required. CRS Builders handles the entire permitting process — from drafting plans to submitting applications and managing corrections. We take the hassle out of permits so you don't have to.