Building and ADU in Temecula: Start Here
When it comes to creating an ADU in Temecula, homeowners earn rental income, create additional housing for family members, and increase their property’s value. This guide from Woollard Construction covers everything you need to know to build an ADU in Temecula, from permits to costs, to help you complete your project in 2026.
What is an ADU?
An Accessory Dwelling Unit (ADU) is an independent living space located on the same property as the main house. It must include a kitchen, a bathroom, and at least one bedroom. Temecula residents refer to ADUs as granny flats, casitas, or in-laws.
According to California Government Code Section 65852.2, ADUs can be built in almost every jurisdiction in California. While California law sets the guidelines for what is allowed, the City of Temecula has created its own rules to govern ADU development in accordance with Temecula Municipal Code Chapter 17.23.
Types of ADUs That Can Be Built in Temecula
Detached ADU
A detached ADU is a completely separate structure in your backyard. There is no maximum square footage for detached ADUs in Temecula.
Attached ADU
An attached ADU is connected to the main house. Attached ADUs cannot be larger than half the size of the primary dwelling or 1,200 square feet.
Garage Conversion ADU
Garage conversions turn your existing garage into a living space. Since the garage already exists, there is no maximum square footage for garage conversions.
Junior ADU (JADU)
Junior ADUs are smaller ADUs located inside the main house. Junior ADUs must be 500 square feet or less, and you must live in the main house to build one.
How Many ADUs Can You Build in Temecula?
On single-family properties, you can build one ADU and one junior ADU per lot. Multi-family properties can have two detached ADUs or up to 25 percent of the number of existing units as ADUs, whichever is greater.
Temecula ADU Size and Setback Requirements
Size Requirements
- Detached new construction: 800 sq ft minimum, 1,200 sq ft maximum
- Attached ADU: 1,200 sq ft maximum or 50% of the primary dwelling
- Garage conversions: No maximum square footage
- JADUs: 500 sq ft maximum
Setbacks
- 4 feet from rear and side property lines
- Garage conversions have no setback requirements
- Front setbacks vary by location
Height Limits
- Detached ADUs: 16 feet
- ADUs near transit stops: 18 feet
- Attached ADUs: 25 feet
Temecula ADU Zoning and Eligibility
ADUs can be built on any residential lot in Temecula. There is no minimum lot size requirement.
To qualify for an ADU in Temecula, the property must have an existing or proposed primary dwelling, adequate water and sewer capacity, and sufficient access for construction.
If your property has a septic system, you need approval from Riverside County Environmental Health Department before starting construction.
Temecula ADU Permit Process
Step 1: Choose Your ADU Type
Based on your lot size and budget, choose whether you want a detached ADU, an attached ADU, or a garage conversion ADU.
Step 2: Design Your ADU
Work with an architect to design your ADU or use pre-approved plans. Your design must comply with the California Building Code.
Step 3: Prepare and Submit the Necessary Documents
For building permit only (Streamlined Approval), prepare the following: a covenant form, construction plans, and a site plan showing the ADU location. Submit these to the City of Temecula Building and Safety Division at 951-694-6400.
Step 4: Planning Department Review
If your ADU does not qualify for Streamlined Approval, you will need to go through the Planning Department approval process.
Step 5: Obtain Building Permit Approval
Temecula has 60 days to approve or reject your ADU application after submission. Most ADUs that qualify receive Ministerial Approval.
Step 6: Construction and Inspections
Once your application is approved, begin construction according to your approved plans. Schedule inspections for foundation, framing, electrical, plumbing, and final.
Step 7: Obtain Certificate of Occupancy
After completing construction, schedule a final inspection to obtain your Certificate of Occupancy.
Temecula ADU Covenant Requirement
All Temecula ADUs require a recorded covenant that restricts:
- Short-term rentals (rentals must be 31 or more days)
- Separate sale from the primary dwelling
- Owner occupancy for JADUs
Download covenant forms directly from the City of Temecula website.
Temecula ADU Parking Requirements
One parking space per ADU bedroom is required unless:
- The ADU is located within a half mile of public transportation
- The ADU involves a garage conversion (replacement parking is not required)
- The ADU is 800 square feet or less
ADU Construction Costs in Temecula
ADU construction costs in Temecula depend on size and design complexity, site conditions, foundation requirements, utility connections, and interior finishes. Garage conversions tend to cost less than new construction. Average cost per square foot ranges from $100 to $300.
Temecula ADU Permit Fees
Permit fees are determined by ADU size, the type of application (building permit or planning application), and utility connection fees. Impact fees do not apply to ADUs that are 750 square feet or less in California.
Utility Connections for Temecula ADUs
ADUs must connect to the main house utilities including water, sewer, electricity, and gas. You do not need to install a separate meter. The City must provide “will-serve” letters to confirm capacity.
For properties with septic systems, contact Riverside County Environmental Health at 951-486-3531 to determine if your property has enough capacity for an ADU.
Temecula ADU Rental Income and Property Value
- Rental rates: $1,500 to $2,500 per month based on size and location
- Property value increase: $100,000 to $200,000
- Property taxes increase based on added value only, not a full reassessment
Note: Short-term rentals such as Airbnb or VRBO are not permitted for ADUs in Temecula.
Temecula ADU Timeline
- Design and permitting: 2 to 4 months
- Construction: 4 to 8 months
- Inspections and Certificate of Occupancy: 2 to 4 weeks
Total timeline from design to completion: 6 to 12 months. Garage conversions take less time than new construction.
Common Challenges of ADU Development in Temecula
Site Preparation
Slope and poor soil conditions can significantly increase site development costs. Hire a professional to assess the site early to identify problems before they affect your budget.
Utility Capacity
Older homes often require utility upgrades. Budget for potential upgrades to water, sewer, and electrical systems.
Design Compatibility
Temecula requires that ADU designs be consistent with surrounding neighborhood characteristics. Work with a designer who has experience with Temecula’s local standards to avoid costly revisions.
Permit Delays
Incomplete application packages cause delays. Submit all required documents on the first submission to avoid resubmitting and waiting longer.
Why Choose Woollard Construction for Your Temecula ADU
Woollard Construction specializes in ADU projects in Temecula. We handle:
- Comprehensive design services
- All permits and inspections
- Site preparation and foundation work
- Full ADU construction management
- Your Certificate of Occupancy
We have direct experience working with City of Temecula inspectors and complete most ADU projects in Temecula in 4 to 6 months.
Temecula ADU Resources
City of Temecula ADU Information
California Government Code Section 65852.2
Riverside County Environmental Health | 951-486-3531
City of Temecula Building and Safety | 951-694-6400
Temecula Municipal Code Chapter 17.23
Start Your Temecula ADU Project Today
Building an ADU in Temecula adds living space, generates rental income, and increases your property’s value. Woollard Construction, a trusted General Contractor in Temecula, CA, guides you through every stage from design to final inspection. Contact us today to schedule a free consultation for your Temecula property. We serve all of Temecula, Murrieta, and Southwest Riverside County. Call us today at (951)-551-6165 to start your ADU consultation.
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Spencer Woollard
Spencer Woollard has 30+ years of experience in custom construction in Southern California. With over 350 completed projects including ADUs and bathroom remodels, Spencer is a trusted local contractor in Temecula, CA.
