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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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#1G A ALLEN COMPANY INC

El Cajon, CA

G A Allen Company Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (619) 561 9552
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#2EDWARDS PAT CONSTRUCTION

El Cajon, CA

Edwards Pat Construction — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (619) 994 6235
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#3UNIVERSITY INDUSTRIAL SERVICES

El Cajon, CA

University Industrial Services — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 36+ years experience.

View Profile📞 (619) 956 2500
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#4H&M ADDITIONAL BUILDERS INC

El Cajon, CA

H&M Additional Builders Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (619) 328 1132
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#5CALIFORNIA MINING AND MANUFACTURING INCORPORATED

El Cajon, CA

California Mining And Manufacturing Incorporated — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (619) 390 3330
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#6O'LEARY T J CONST

El Cajon, CA

O'Leary T J Const — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 46+ years experience.

View Profile📞 (619) 855 1823
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#7BOTHOF REMODEL AND CONSTRUCTION

El Cajon, CA

Bothof Remodel And Construction — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (619) 922 3135
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#8I A S BUILDERS

El Cajon, CA

I A S Builders — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (877) 428 6777
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#9FRAMECO CONSTRUCTION INC

El Cajon, CA

Frameco Construction Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (619) 445 4900
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#10R - ZONE CONSTRUCTION INC

El Cajon, CA

R - Zone Construction Inc — licensed ADU contractor in EL Cajon, CA. Detached ADU construction.

View Profile📞 (619) 757 5492
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

Los Angeles (3215)San Diego (2582)San Francisco (2170)Sacramento (1551)Riverside (925)Fresno (904)Anaheim (784)Irvine (760)

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