ADU Construction IN Lake Elsinore
We are your ADU Builder of choice. Focused on building ADUs the right way!
- Licensed & Insured
- Permit-Friendly ADU Builds
- Detached, Attached & Garage Conversions
- Serving Riverside & Orange County
ADU Construction in Lake Elsinore!
As a General Contractor, SouthSTAR Construction provides top-tier ADU construction in Lake Elsinore and throughout Riverside County and Orange County — including Norco, Eastvale, Riverside, and surrounding cities. We build detached ADUs, attached ADUs, garage conversions, and JADUs. Our work is built to code, built to last, and built to the standard we’d expect if it were our own home. If you already have approved plans and need a builder, we welcome the opportunity to earn your business.
Types of ADU's We Build
At SouthSTAR Construction, our ADU construction in Lake Elsinore cover every type of unit recognized under California law — and we build all of them. Here’s an overview of what’s possible on your property when you hire a ADU Contractor:
- Detached ADU Construction (Most Common) — A fully separate structure built in your backyard, independent of your main home. Detached ADUs offer the most privacy and flexibility, and typically range from 400 to 1,200 square feet. This is the most popular ADU construction in Lake Elsinore and throughout Riverside and Orange County.
- Attached ADU Construction — An addition connected to your existing home with its own entrance, kitchen, and bathroom. Attached ADUs are a strong option when your backyard space is limited but you have room to expand along a side or rear wall.
- Garage Conversion — Converting an existing attached or detached garage into a livable ADU. This is one of the most cost-effective paths to adding rental income or family housing, since the structure and foundation already exist.
- JADU Construction (Junior ADU) — A JADU is created within the existing footprint of your home — typically by converting a bedroom or interior space. JADUs are capped at 500 square feet under California law and must include an efficiency kitchen.
Not sure which type fits your property? We’ll evaluate your lot, setbacks, and city requirements and tell you exactly what’s buildable — no guesswork, no runaround.
ADU CONSTRUCTION COST BREAKDOWN IN CALIFORNIA FOR 2026
Every ADU Construction project is unique. The information below is provided to help homeowners understand the typical cost components involved in building an Accessory Dwelling Unit (ADU). Final pricing depends on site conditions, design complexity, utility requirements, material selections, and local permitting jurisdiction.
*Cost ranges shown are estimates only and do not constitute a formal quote.*
Project Plans & Design
Typical Range: $4,500 – $15,000+
Architectural plans and engineering are required to obtain permits and ensure the ADU complies with local building codes. Design costs vary based on layout complexity, structural requirements, and the overall scope of the project.
City Permits & Plan Check Fees
Typical Range: $3,500 – $20,000+
Permit and plan check fees are determined by the local city or jurisdiction and are typically paid at the time of plan submittal. These fees vary based on ADU size, location, and municipal requirements.
Utility Connections & Site Work
Typical Range: $5,000 - $25,000+
Utility connections such as water, sewer, electrical, gas, and fire sprinklers depend on existing infrastructure and site conditions. These costs vary by property and are evaluated during the planning phase.
ADU Construction Costs
Typical Range: $250 – $450 per SQFT
Construction costs depend on several factors, including:
- ADU size and layout
- Finish level and material selections
- Structural and foundation requirements
- Site access and logistics
Our Approach to ADU Pricing
The most accurate way to understand ADU pricing is to review your property, city requirements, and project goals. We’ll help you confirm feasibility, define scope, and outline the next steps toward building your ADU.
Get a Realistic ADU Cost for Your Property
Our pricing reflects professional project management, permit-conscious planning, and quality craftsmanship built to last. We focus on well-executed ADUs designed for long-term value—not low-cost.
Why You Should Build an ADU
- Additional Rental Income
Generate monthly income by renting your ADU long-term or using it as flexible housing for extended stays. - Multigenerational Living
Create a private, comfortable living space for parents, adult children, or guests—while maintaining independence and privacy. - Increase Property Value
ADUs add functional square footage and versatility, often increasing overall property value and market appeal. - More Affordable Than Buying or Expanding
Building an ADU can be more cost-effective than purchasing a new home or completing a large-scale addition. - Flexible Living Space
Use your ADU as a home office, guest suite, studio, or future rental—allowing your needs to evolve over time. - Age-in-Place Solutions
Provide a safe, independent living option that allows loved ones to stay close while maintaining autonomy.
ADUs are a popular solution throughout Riverside County and Orange County for homeowners seeking flexible, long-term housing options.
Not sure if an ADU makes sense for your property? We can help you evaluate your options.
ADU Guidelines & Resources: California Department of Housing and Community Development
ADU CONSTRUCTION IN LAKE ELSINORE
SouthSTAR Construction builds complete ADUs — from foundation to final finish. We perform the work, and we personally select and oversee every trade on your project. Here’s what we cover:
Our ADU Services Include:
ADU Planning & Feasibility
Site evaluation, zoning review, and early planning to confirm what’s possible on your property.
Design & Permit Coordination
Already have approved plans? Great — we’re ready to build. Need plans? We have trusted architects and engineers and can help coordinate that process. Either way, we handle it.
Full ADU Construction in Lake Elsinore
Ground-up detached ADUs, attached ADUs, garage conversions, and JADUs. Framed right, finished right, and built to the level of quality that earns referrals.
Utilities & Site Integration
Coordination of electrical, plumbing, sewer, water, gas, and fire sprinkler connections as required.
Interior & Exterior Finishes
Complete build-out including kitchens, bathrooms, flooring, cabinetry, windows, doors, and exterior finishes.
Project Management & Inspections
Scheduling, trade coordination, inspections, and final walkthrough—handled start to finish by our team.
We specialize in complete ADU builds, not partial scopes or piecemeal workmanship.
Start Your ADU Consultation
We specialize in full ADU projects. Submissions are reviewed within 1–2 business days.
Frequently Asked Questions — ADU's
ADU costs in Riverside and Orange County typically range from $250 to $450 per square foot for construction alone. A complete 600 sq ft ADU including plans, permits, and construction generally runs between $150,000 and $300,000 depending on finishes, site conditions, and city requirements. See our full cost breakdown above for a detailed overview.
From initial consultation to final inspection, most ADUs take 8 to 12 months. This includes 2 to 4 months for design and permitting, and 4 to 6 months of active construction. Timelines vary based on city approval speed and project complexity.
No — you can come to us at any stage. If you don’t have plans yet, we can connect you with trusted architects and engineers. If you already have approved plans, we’re happy to provide a construction estimate based on your existing documents.
We build ADUs throughout Riverside County and Orange County, including Corona, Riverside, Norco, Eastvale, Chino, Ontario, Rancho Cucamonga, Moreno Valley, Anaheim, Yorba Linda, Fullerton, and surrounding communities.
California state law has made it significantly easier to build ADUs on smaller lots since 2020. Most single-family properties are now eligible. We’ll review your specific lot, zoning, and setback requirements to confirm what’s possible on your property.
A detached ADU is a brand-new structure built in your backyard. A garage conversion repurposes an existing garage into livable space. Garage conversions are typically faster and less expensive because the structure already exists, but they result in a loss of garage space.
Yes. SouthSTAR Construction holds California CSLB License #1076870 — General A, General B, C-10 (Electrical), and C-36 (Plumbing). We are fully licensed, bonded, and insured.
ADU Construction in Lake Elsinore and Surrounding Areas:
Riverside County ADU Service Areas
Corona, Norco, Eastvale, Riverside, Chino, Chino Hills, Ontario, Jurupa Valley, Moreno Valley, Temecula, Murrieta, and surrounding communities.
Orange County ADU Service Areas
Anaheim, Orange, Yorba Linda, Fullerton, Brea, Placentia, Garden Grove, Santa Ana, Irvine, Huntington Beach, and surrounding communities.