Southern California ADU Builder
Start Every ADU Project With a Professional Feasibility Report
Understand what may be possible on your property before spending thousands on architectural plans, engineering, permits, or construction.
Our Professional ADU Feasibility Report is prepared through human research and property-specific analysis. It helps identify potential ADU size, placement options, setbacks, site constraints, estimated costs, permit considerations, and practical next steps before full design begins.
ADU Builders Southern California • A brand of Team All Star Construction • California Contractor License #1009760
City-specific feasibility review before plans
Permit-ready coordination aligned to local requirements
Fixed scope defined before construction begins
One licensed team from review through build
ADU type guidance based on your property and goals
Complimentary
Professional ADU Feasibility Report
Everything you need to know before spending thousands on plans or permits.
- Maximum ADU Size
- Setbacks
- Buildable Area
- Zoning Review
- Estimated Budget
- Rental Income Potential
- Site Constraints
- Preliminary Build Concept
- Next Steps
Most homeowners spend hundreds or even thousands on planning before knowing what can actually be built. Our Professional ADU Feasibility Report helps you understand your property’s potential before making that investment.
Not Ready to Request Your Full Feasibility Report Yet?
Check Your Property’s ADU Potential
Use our interactive property checker to explore preliminary ADU possibilities, basic lot information, potential sizing, and placement concepts before requesting your Professional ADU Feasibility Report.
Start with a free online site check. Enter your address to get an early look at what kind of ADU may be possible on your property.
Which Best Describes You?
Select the path that best matches what you want to accomplish with your property.
I Want to Build an ADU
Explore ADU types, floor plans, costs, permits, financing, and the planning steps involved in creating additional living space for family, rental income, or long-term flexibility.
I Want to Maximize My Property
Explore how qualifying California properties may support additional units, long-term rental income, and a broader development strategy based on the property’s actual potential.
LIMITED-TIME OFFER
From Backyard to Beautiful ADU
Experience the complete construction journey of a 650 sq. ft. detached ADU—from site preparation and foundation to the finished home.
Types of ADUs We Build
Detached ADU
A detached ADU is a separate living unit built on the same property as the primary home. It provides fully independent living space and is commonly used for rental income, family housing, or long-term flexibility.
Garage Conversion ADU
A garage conversion ADU transforms an existing garage into livable space. This option often reduces construction time and cost by reusing an existing structure while adding long-term value to the property.
Junior ADU (JADU)
A Junior ADU (JADU) is a smaller living unit located within the primary residence. It is limited in size and subject to specific state and local requirements, including owner-occupancy rules.
Attached ADU
An attached ADU is connected to the existing home. It can work if the property has enough space, the layout supports the addition, and it meets setback, access, utility, and building code requirements.
Is This a Fit?
Good fit if:
- You own the property
- You want a permitted, California-compliant ADU
- You are considering rental income, family housing, guest space, or long-term property flexibility
- You want to understand feasibility before investing in plans
- You are ready to discuss scope, budget range, timeline, and next steps
Not a fit if:
- You only need a standalone inspection
- You are looking for repair-only work
- You need guaranteed approval before review
- You want an exact construction price without design, site review, and permit evaluation
Estimate Your ADU Cost in Seconds
Use our ADU cost calculator to get a general planning range based on ADU size, county, and monthly payment assumptions.
This tool is meant to help homeowners start the budgeting conversation. It is not a construction bid, lender approval, or permit determination. Final pricing depends on property conditions, city requirements, design, engineering, utilities, selected finishes, access, and final scope.
What Happens Before Construction?
Most homeowners don’t realize that months of planning, engineering, permits, and coordination happen before construction ever begins.
What Could an ADU Make Possible?
Create Long-Term Rental Potential
A thoughtfully planned ADU may provide long-term rental income while adding a separate living space to your property.
Add Flexible Living Space
Use the ADU as a guest house, home office, creative studio, caregiver suite, or a space that can change as your household needs evolve.
Make Room for Family
Create a private home for parents, adult children, relatives, or extended family while keeping everyone close.
Support Long-Term Property Use
An ADU can help a property serve more purposes over time, from family housing today to rental or guest use later.
Plan for Aging in Place
A single-level ADU can provide a more manageable living arrangement for aging parents or homeowners planning for future accessibility needs.
Explore Property Value Potential
A permitted, well-designed ADU may improve the usefulness and market appeal of a property. The effect on property value varies and should not be presented as a guaranteed percentage.
Still Researching? Download the Official 2026 California ADU Handbook
Get the official California HCD guide covering ADU types, setbacks, parking, permits, fees, utilities, owner occupancy, multifamily properties, and recent changes to state law.
Service Areas
Serving homeowners throughout Southern California, with primary operations in Los Angeles, Orange, Riverside and San Bernardino Counties. Projects in Ventura, San Diego and other Southern California communities may be considered on a case-by-case basis.
Each city has its own review process, planning requirements, utility considerations, and inspection workflow. That is why we start with property-specific review instead of assuming one ADU answer applies everywhere.
Our ADU Process
Initial Consultation
Step 01
We start by learning your goals, property location, target ADU type, budget expectations, timeline, and intended use.
Site and Feasibility Review
Step 02
The property is reviewed for city requirements, lot conditions, access, existing structures, utilities, setbacks, and potential constraints.
Design Planning
Step 03
Once the project direction is clearer, the ADU layout, size, features, and scope can be developed around the property and homeowner goals.
Engineering and Permit Coordination
Step 04
ADU plans may require engineering, city submission, plan check comments, revisions, and permit approval before construction can begin.
Construction Planning
Step 05
Before work starts, the project scope, schedule expectations, access needs, materials, and site coordination are reviewed.
ADU Construction
Step 06
Construction may include foundation work, framing, roofing, plumbing, electrical, HVAC, insulation, drywall, finishes, utilities, and inspections, depending on the ADU type.
Final Inspection and Completion
Step 07
The project is completed after required inspections, final corrections, and closeout steps are handled.
Timelines vary by city, ADU type, design complexity, engineering, utility work, permit review, site access, material selections, and inspection schedules.
Licensed California ADU Contractor
Team All Star Construction is a California-licensed design-build contractor focused on helping Southern California homeowners plan and build well-designed ADUs. Our completed projects are presented as detailed case studies so homeowners can see the planning, construction and finished results.
The Team Behind Your ADU Project
Building an ADU is a major investment, and homeowners deserve clear guidance at every stage. Our team approaches each project with thoughtful planning, honest communication, realistic expectations, and careful attention to the details that can affect cost, permitting, construction, and the final result.
From the initial feasibility review through design coordination, permits, construction, and final inspection, our goal is to help you understand what comes next and make informed decisions along the way. We believe a well-planned ADU project should feel organized, transparent, and supported by real people who are accountable for the work.
100% Financing Options Available*
ADU financing may be available through third-party lenders or financing providers, depending on borrower qualifications, property details, loan terms, and lender approval.
Common ADU financing paths may include HELOCs, home equity loans, cash-out refinance, construction loans, renovation loans, or other financing options. Team All Star Construction is not a lender and does not provide financing approvals.
Strong permit approval track record*
Across reviewed projects, subject to city requirements.
4–6 month average timeline*
From permit approval to construction completion; timelines vary by city and scope.
Timelines and approval outcomes vary by jurisdiction, scope, and third-party agency review.
ADU costs vary by city, scope, and site constraints. We review feasibility before discussing budgets.
Financing options available OAC. Service areas: San Bernardino, Riverside, Orange, Los Angeles, and Ventura County.
Watch a Real ADU Come to Life
This is an actual detached ADU built by Team All Star Construction. From construction to completion, these are real photos and videos from one of our projects.
Ready for a Professional Review?
Ready to understand what may be possible on your property?
Request an ADU feasibility review and our team will help review the property, discuss ADU options, identify likely constraints, and outline practical next steps.
Submitting a form is a request for an initial consultation only. It does not create a construction contract or guarantee project approval, final pricing, financing approval, or construction timeline. Financing options are offered by third-party lenders and are subject to credit approval, terms, and conditions. Availability varies.
Frequently Asked Questions About ADUs in California
What is an ADU?
An ADU, or accessory dwelling unit, is a secondary residential unit built on the same lot as a primary home. ADUs are subject to California law, local city requirements, building codes, utility requirements, and permit review.
Do you offer ADU financing?
Financing options may be available through third-party lenders or financing providers. Approval, rates, terms, monthly payments, and loan availability depend on borrower qualifications and lender review. Team All Star Construction is not a lender.
Which areas do you serve?
Team All Star Construction helps homeowners with ADU planning and construction in Los Angeles County, Orange County, Riverside County, San Bernardino County, and Ventura County.
How long does an ADU take?
ADU timelines vary by city, ADU type, design complexity, engineering, permit review, utility work, site access, material selections, and inspection schedules. A feasibility review helps identify likely timing factors before the project moves forward.
Do I need plans before contacting you?
No. Many homeowners contact us before they have plans. Feasibility review is usually the first step because it helps determine what kind of ADU may be realistic before investing in design and engineering.
How much does an ADU cost?
ADU cost depends on size, ADU type, site conditions, city requirements, utilities, design, engineering, finishes, access, and construction scope. A garage conversion may have a different cost structure than a detached ADU because the existing structure changes the work required.
Can I build an ADU for rental income?
Many homeowners consider ADUs for long-term rental income, but rental income is not guaranteed. Actual rent depends on the city, neighborhood, ADU size, condition, market demand, lease terms, and applicable rental rules.
Can my city deny my ADU?
California law limits how cities can restrict ADUs, but every project still needs to meet applicable requirements. A city may require corrections, revisions, or additional documentation if the plans do not meet code, zoning, utility, fire, or other review requirements.