City of La Mesa
ADU Regulations in La Mesa.
Everything you need to know about building an ADU in the City of La Mesa. Updated for 2025.
ADU Requirements for La Mesa
The City of La Mesa has its own municipal code governing ADU construction. La Mesa follows California state ADU laws with streamlined processing. The city has seen significant ADU growth in recent years.
Maximum Size
1,200 SF (detached) / 1,000 SF (attached)
Height Limits
24 feet / 16 feet (1-story)
Setback Requirements
4 ft side and rear for detached ADUs
Parking Requirements
No additional parking required
Owner Occupancy
No owner-occupancy requirement
Allowed ADU Types
Detached ADU, Attached ADU, JADU, Garage Conversion
Design Standards
ADUs must comply with building codes; design review not required for most ADUs
Fees & Impact Charges
Impact fees reduced or waived for ADUs under 750 SF
Building in La Mesa?
Our team knows La Mesa inside and out. We'll handle the entire permitting process so you don't have to.
Free Feasibility Check (858) 788-3839Why CRS for La Mesa:
Frequently Asked Questions
How long does it take to build an ADU in La Mesa? expand_more
The typical timeline for an ADU project in La Mesa 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 La Mesa? expand_more
ADU costs in La Mesa 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 La Mesa? 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.