SouthStar USA offers ADU construction in Riverside & Orange County, CA. Services include detached ADUs, attached ADUs, garage conversions & JADUs. Quality builds, permit-compliant, with transparent pricing for every project stage.

SouthStar USA, Corona, CA

About SouthStar USA

ADU Construction Services by SouthStar USA

SouthStar USA provides ADU construction services throughout Riverside County and Orange County, serving communities including Norco, Eastvale, Riverside, and surrounding cities. They build accessory dwelling units using quality materials and skilled tradespeople, with personal oversight on every project.

Whether a client comes with approved plans already in hand or is starting from scratch, SouthStar USA offers an honest assessment and straightforward pricing. They specialize in full ADU projects and welcome the opportunity to work with clients at any stage of the process.

The types of ADUs SouthStar USA builds include:

  1. Detached ADUs — standalone accessory dwelling units built on the same property as the primary residence
  2. Attached ADUs — units connected to the existing home structure
  3. Garage conversions — converting an existing garage into a livable ADU space
  4. JADUs (Junior Accessory Dwelling Units) — smaller units typically created within the existing footprint of a home

All construction is built to code and designed for long-term durability. SouthStar USA focuses on well-executed projects rather than low-cost alternatives, and their pricing reflects professional project management, permit-conscious planning, and quality craftsmanship.

Understanding ADU Project Costs

ADU pricing involves several variable components that depend on the specific property, location, and project scope. SouthStar USA outlines the key cost factors clients should be aware of:

  1. Architectural plans and engineering — Required to obtain permits and ensure the ADU complies with local building codes. Design costs vary based on layout complexity and structural requirements.
  2. Permit and plan check fees — Determined by the local city or jurisdiction and typically paid at the time of plan submittal. These fees vary based on ADU size, location, and municipal requirements.
  3. Utility connections — Water, sewer, electrical, gas, and fire sprinklers depend on existing infrastructure and site conditions. These costs are evaluated during the planning phase.

Because so many variables affect the final cost, SouthStar USA recommends reviewing the property, city requirements, and project goals together to get an accurate picture of ADU pricing. They help clients confirm feasibility, define the scope of work, and outline the next steps.

Working With SouthStar USA

SouthStar USA positions itself as an ADU builder focused on quality and long-term value. They are not a low-cost option, but rather a contractor that prioritizes professional execution and compliance throughout the building process.

For clients who already have approved plans and are looking for a qualified ADU contractor to carry out the build, SouthStar USA is open to those inquiries as well. Project submissions are typically reviewed within 1–2 business days.

Their service area covers Riverside County and Orange County, making them an accessible option for homeowners across a broad region of Southern California looking to add an accessory dwelling unit to their property.

Services

SouthStar USA performs the following services

  • Architecture & Design
  • Permit Specialist
  • Construction
  • Feasibility & Site Assessment

SouthStar USA Reviews

Matthew Barhoma

2026-02-19
"I highly recommend Southstar construction. John and his crew have been very knowledgeable and have been able to help me navigate the construction process with ease. They were experts in custom homes and ADU and their work product is impeccable. I would not hesitate to call John and Southstar construction for all construction needs."

Sandra Tewfik

2026-02-19
"We used South Star construction to build our ADU from the ground up and had a great experience overall. They were efficient, fairly priced, and very upfront about what was included in their scope of work. Communication was clear, there were no surprise costs, and they delivered what they promised. The project stayed on track, and the quality of work was solid. If youre looking for an honest contractor who does good work and respects your budget, Id definitely recommend them."

Felicia Becerra

2026-02-11
"We came to SouthStar to build an ADU on my grandparents property. At first we considered getting a manufactured home vs. an ADU. John and his team were extremely knowledgeable and not pushy. We ultimately went with SouthStar for the ADU build out and couldnt be more happy with the results. He was able to work within our budget and still give us a beautiful finished product. You can probably find someone cheaper, but you get what you pay for. Save yourself the headache."

Alexis Goddard

2026-01-30
"I hired another contractor who left me with a huge mess -unfinished and unpermitted work. John was referred to me and has been absolutely incredible with getting my renovation back on track, he not only gave me advice but helped me get to the point where am finally feeling like there is a light at the end of this nightmare of a renovation. He helped get me connected to quality subcontractors who were honest, fair and completed work on time. I am so thankful to have been referred to John, you wont regret working with him!"

J Rundle

2025-08-02
"We couldnt have been happier with the work that was done by SouthSTAR Construction when we had our balcony torn down and rebuilt. John and his team were very professional, showed up on time, paid attention to all the little details needed, always cleaned up at the end of the day, and always communicated throughout the job on what was being done. Id highly recommend John and his team from SouthSTAR Construction to anyone that needs work done, you wont be disappointed!"

Specifics

Opening hours

Monday 7:00AM - 7:00PM
Tuesday 7:00AM - 7:00PM
Wednesday 7:00AM - 7:00PM
Thursday 7:00AM - 7:00PM
Friday 7:00AM - 7:00PM
Saturday 7:00AM - 7:00PM
Sunday 7:00AM - 7:00PM

Location

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