Turnkey ADU Construction in Huntington Beach, CA
If you’re looking to add extra living space or create a rental unit without the hassle of managing multiple contractors, a turnkey ADU construction service is the solution you need. At Refined ADU Builder & Garage Conversions, we handle everything from design and permits to construction and final inspection. This means you get a fully completed Accessory Dwelling Unit without needing to coordinate different phases yourself, saving you time and stress. Whether you want to convert a garage or build a new unit in your backyard, our team works closely with you to ensure the process is smooth and meets your needs.
You don’t have to worry about juggling permits, construction delays, or design challenges. With us, every step is managed by experienced professionals who specialize in ADUs and garage conversions. We understand local building codes and zoning laws, so you won’t be left guessing what’s required. Our goal is to help you turn your property into a valuable space, whether it’s for family, guests, or extra income.
By choosing Refined ADU Builder & Garage Conversions, you get a partner who stays with you from start to finish. We focus on quality craftsmanship and clear communication so that the final unit fits your vision and adds lasting value. You can trust us to deliver an ADU that works for your lifestyle and budget, without the headaches of handling every detail on your own.
Turnkey ADU Construction Process
We handle every step of building your ADU, from the first meeting to the final walk-through. You get a clear plan, smooth permits, and quality construction without worry.
1. Initial Consultation and Site Assessment
We start by meeting with you to understand your goals for the ADU. We review your property to see what can fit and where. This includes measuring your lot and checking local zoning rules to avoid issues later.

Our team listens carefully to your needs, whether it’s a guest house, rental unit, or extra space. We identify any challenges early, like utility connections or access points. This helps us plan an efficient project that suits your property exactly.
2. Custom ADU Design and Planning
Next, we create a plan tailored just for you. Using your input, we design a layout that works with your lifestyle and local rules. We focus on space, light, and flow to make your ADU comfortable and functional.

We present different design options and explain choices for materials and finishes. You get detailed drawings that show how the ADU will look inside and out. This stage includes setting a budget and timeline to keep the project on track.
3. Permitting and Compliance
We manage the entire permitting process to save you time and hassle. This means preparing all the paperwork, submitting plans, and communicating with building departments.

Since approvals can take months, we stay on top of the process and keep you informed of progress. We make sure your ADU meets all safety, zoning, and building codes so you avoid delays or fines.
4. Full-Service Construction and Finishing
Once permits are approved, our team begins construction. We handle everything from foundation work to the final coat of paint. You don’t have to coordinate different contractors — we manage all trades and scheduling.

Throughout building, we maintain quality checks and keep your site clean and safe. When the construction ends, we do a detailed inspection and walk the ADU with you to make sure it meets your expectations.
Types of ADU Projects by Refined ADU Builder & Garage Conversions
We offer a range of ADU options to suit your property and lifestyle. Whether you want a separate living space, an addition connected to your home, or to transform existing structures, we guide you through practical solutions with clear design and construction plans.
Detached ADUs
Detached ADUs are standalone units built separately from your main house. They offer privacy and flexibility, making them ideal for guest quarters, rental income, or multi-generational living.

We handle everything from design to permits, ensuring the unit fits your yard and follows local rules. Detached ADUs can include studios, small cottages, or one-bedroom homes. We focus on maximizing usable space while keeping the design simple and functional.
Attached ADUs
Attached ADUs connect directly to your home, often as an addition or converted space like a basement or side room. This option can be more cost-effective than a new building since it uses part of your existing structure.
Our team design layouts that maintain flow between the ADU and your main living area, while offering a private entrance when needed. Attached ADUs are a great choice if you want easy access to the main home, such as for elderly family members or caretakers. We ensure proper insulation, electrical, and plumbing work to make the attached space comfortable year-round.
Garage Conversions
Garage conversions transform your unused or underused garage into a living space. This approach maximizes your home's footprint without new construction, reducing costs and construction time.

We assess your garage’s structure to ensure it can be converted safely. After that, we develop plans including insulation, flooring, walls, and windows to meet living space standards. You can add a kitchenette, bathroom, or workspace depending on your needs.
ADU Financing and Cost Considerations
We know that understanding the financial side of building an ADU is key to making good decisions. You’ll need to consider how to finance the project and what will affect the total cost to plan effectively.
Financing Options for Homeowners
You can use several financing methods when building an ADU. A common choice is a home equity loan or line of credit, which lets you borrow against the value of your home. This option often has lower interest rates compared to other loans.
Another option is the Homestyle loan, which bundles the purchase of your home with remodeling or building an ADU. This simplifies paying for both in one loan rather than separate financing.

Some local programs also offer extra funding, like a $50,000 grant or loan, to help with costs. Checking what’s available in your area can save you money and reduce upfront expenses.
Factors Influencing Project Cost
The cost of your turnkey ADU project depends on several key factors. The size and type of ADU, like a detached unit or garage conversion, affect materials and labor needed.

Site preparation is another important factor—if your land needs grading or utility hookups, costs can rise. Permitting fees and local regulations also add to the total.
Choosing finishes and appliances influences your final price too. Standard fixtures keep costs down, while high-end options raise the budget. We help you understand each of these costs clearly so you can make informed choices that fit your budget.
FAQS on Turnkey ADU Construction
We understand you need clear information about our process, timelines, warranties, and options between different ADU types. We make your project straightforward by handling key details from start to finish.
What are the advantages of choosing Refined ADU Builder & Garage Conversions for my ADU project?
We specialize in turnkey ADU construction, working closely with you to manage zoning, design, permits, and building. Our local experience helps you avoid common roadblocks and ensures your project fits your needs.
Can Refined ADU Builder & Garage Conversions help with the permitting process for an ADU?
Yes, we handle the permitting process from start to finish. We guide you through local regulations and submit all necessary documents to reduce delays, which can often take several months.
What type of warranty does Refined ADU Builder offer on their ADU construction?
We provide a standard builder’s warranty covering workmanship and materials. This helps protect your investment and gives you peace of mind after construction is complete.
How long does the construction process typically take with Refined ADU Builder & Garage Conversions?
Construction usually takes a few months once permits are approved. The exact timeline depends on the size and complexity of your ADU and local permit processing times.
How do modular ADUs compare to traditionally built ADUs in terms of cost and quality?
Modular ADUs can be faster to build and may cost less upfront due to factory construction. Traditional ADUs often allow more customization but can take longer and be pricier.