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ADU Builders & Contractors in El Cajon, CA

El Cajon, CA homeowners looking to build an ADU have 520 licensed contractors to choose from, ready to help. Whether you're planning a garage conversion, detached ADU, or junior ADU, finding the right contractor in El Cajon starts here.

📊 ADU Quick Facts for El Cajon

Avg. Cost/sqft

$199-$374

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 520 ADU Contractors in El Cajon

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#1CUSTOM POOLS & LANDSCAPING

El Cajon, CA

Custom Pools & Landscaping — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 27+ years experience.

View Profile📞 (619) 300 2443
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#2T K S

El Cajon, CA

T K S — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (619) 788 4256
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#3AIR MANAGEMENT SYSTEMS

El Cajon, CA

Air Management Systems — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (619) 390 7803
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#4SOUTHWEST TRAFFIC SIGNAL SERVICE INC

El Cajon, CA

Southwest Traffic Signal Service Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 42+ years experience.

View Profile📞 (619) 442 3343
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#5J WELLS AND ASSOCIATES

El Cajon, CA

J Wells And Associates — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 42+ years experience.

View Profile📞 (619) 440 6849
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#6MC BREATY CONSTRUCTION CORPORATION

El Cajon, CA

MC Breaty Construction Corporation — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (619) 561 0546
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#7ALBA'S REMODELING

El Cajon, CA

Alba'S Remodeling — licensed ADU contractor in EL Cajon, CA. Detached ADU construction.

View Profile📞 (619) 647 4551
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#8SKY KING GENERAL CONTRACTORS INC

El Cajon, CA

Sky King General Contractors Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (619) 813 4004
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#9ANDRE'S BUILDING CONSTRUCTION SERVICES INC

El Cajon, CA

Andre'S Building Construction Services Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction.

View Profile📞 (619) 647 6700
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#10PETERSON RYAN

El Cajon, CA

Peterson Ryan — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (858) 337 7761
View All 520 Contractors →

💰 How Much Does an ADU Cost in El Cajon?

Garage Conversion

$69,500 - $129,500

Converting existing garage to living space

Detached ADU

$149,000 - $324,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,108 - $5,108

Plan check, permits, utility connections

* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple El Cajon contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in El Cajon

How much does it cost to build an ADU in El Cajon?▼
The average cost to build an ADU in El Cajon ranges from $149,000 to $324,000, or approximately $199 to $374 per square foot. Garage conversions typically cost $69,500 to $129,500.
How long does it take to get an ADU permit in El Cajon?▼
The ADU permit process in El Cajon typically takes 60 to 120 weeks. California law requires cities to approve or deny ADU permits within 60 days of receiving a complete application.
What are the ADU size limits in El Cajon?▼
In El Cajon, detached ADUs can be up to 1200 square feet. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sqft, whichever is less. Junior ADUs (JADUs) are limited to 500 sqft and must be within the existing home.
What is the setback requirement for ADUs in El Cajon?▼
El Cajon requires 4-foot setbacks from side property lines and 4-foot setbacks from rear property lines for new ADU construction. Converted structures (like existing garages) may maintain their current setbacks.
Do I need to provide parking for my ADU in El Cajon?▼
No parking is required for ADUs in El Cajon if your property is within half a mile of public transit, in a historic district, part of an existing multi-family building, or if the ADU is a garage conversion. Otherwise, one space may be required.

Also See ADU Contractors In

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