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ADU Builders & Contractors in Thermal, CA

With 16 verified ADU contractors serving Thermal, CA, homeowners have plenty of options for their accessory dwelling unit project. Local contractors ready to help specialize in everything from design-build to permit navigation.

📊 ADU Quick Facts for Thermal

Avg. Cost/sqft

$194-$369

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 16 ADU Contractors in Thermal

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#1VIEJO CONSTUCTION

Thermal, CA

Viejo Constuction — licensed ADU contractor in Thermal, CA. Detached ADU construction. 30+ years experience.

View Profile📞 (760) 219 8360
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#2D C R CONSTRUCTION INC

Thermal, CA

D C R Construction Inc — licensed ADU contractor in Thermal, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (760) 394 4648
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#3KARLX CONSTRUCTION

Thermal, CA

Karlx Construction — licensed ADU contractor in Thermal, CA. Detached ADU construction.

View Profile📞 (760) 427 2848
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#4A I N CONSTRUCTION AND REMODELING

Thermal, CA

A I N Construction And Remodeling — licensed ADU contractor in Thermal, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (760) 899 6164
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#5URSA CONSTRUCTION

Thermal, CA

Ursa Construction — licensed ADU contractor in Thermal, CA. Detached ADU construction.

View Profile📞 (760) 625 8841
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#6PALAFOX DRYWALL & PAINTING

Thermal, CA

Palafox Drywall & Painting — licensed ADU contractor in Thermal, CA. Detached ADU construction. 25+ years experience.

View Profile📞 (760) 831 0259
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#7RELIEF CONSTRUCTION INC

Thermal, CA

Relief Construction Inc — licensed ADU contractor in Thermal, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (619) 646 6826
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#8DESERT BUILDING CONSTRUCTION

Thermal, CA

Desert Building Construction — licensed ADU contractor in Thermal, CA. Detached ADU construction.

View Profile📞 (760) 960 1810
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#9D & P ENGINEERING INC

Thermal, CA

D & P Engineering Inc — licensed ADU contractor in Thermal, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (760) 404 7773
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#10COVAL CONSTRUCTION

Thermal, CA

Coval Construction — licensed ADU contractor in Thermal, CA. Detached ADU construction.

View Profile📞 (760) 766 6233
View All 16 Contractors →

💰 How Much Does an ADU Cost in Thermal?

Garage Conversion

$67,000 - $127,000

Converting existing garage to living space

Detached ADU

$144,000 - $319,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,104 - $5,104

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Thermal

How much does it cost to build an ADU in Thermal?▼
The average cost to build an ADU in Thermal ranges from $144,000 to $319,000, or approximately $194 to $369 per square foot. Garage conversions typically cost $67,000 to $127,000.
How long does it take to get an ADU permit in Thermal?▼
The ADU permit process in Thermal 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 Thermal?▼
In Thermal, 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 Thermal?▼
Thermal 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 Thermal?▼
No parking is required for ADUs in Thermal 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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