
Crafting personalized ADU layouts that fit your space and lifestyle.
Handling all the necessary permits to streamline your ADU project.
Developing innovative and functional architectural plans for your ADU.
Building high-quality ADUs with precision, care, and efficiency.
Discover the variety of ADU types we offer, each tailored to fit unique needs and property layouts.
Our first step is understanding your ADU vision and evaluating its feasibility. We provide a free virtual site assessment, zoning analysis, and budget estimate as part of this process. We’ll also identify any overlay zones or potential challenges that could impact your project. This gives you a clear, high-level overview of feasibility, costs, and answers to any questions you may have.
If you’ve already secured financing for your project, you can skip this step. Otherwise, now is the perfect time to explore funding options. With an estimated all-in cost for your ADU project—including design, permits, sitework, and construction—we can also recommend lenders who specialize in ADU financing.
We’ll create a detailed proposal outlining the complete, all-inclusive costs for your ADU project. Our process is thorough, reviewing over 75 property-specific factors to ensure precise scoping and budgeting. With insights from discovery calls and virtual site visits, our proposal delivers the same depth as Feasibility Reports that often cost $2,500 elsewhere—but at no upfront charge. Once you approve the proposal, we’ll start the Feasibility Study, and you’ll only be billed after the work is completed.
The Feasibility phase includes a comprehensive planimetric and topographic survey, utility mapping and planning, and a full evaluation of local regulations and site-specific conditions. During this critical stage, we develop your floor plan, exterior elevations, and detailed 3D renderings. If required, we also handle boundary surveys, septic system planning, and preliminary reviews with local jurisdictions. All findings, along with a preliminary project budget, are compiled into a complete Feasibility Study. Timeline: • Standard Plan: 8–10 weeks • Custom Plan: 10–12 weeks
Once you approve the Feasibility Report, our drafting team prepares all required architectural drawings, calculations, and reports needed for city permit applications. This includes any necessary documents for HOA approvals, soil reports, or construction loan applications. During this stage, we conduct a detailed constructability analysis to ensure the design is practical and fully compliant. After finalizing the construction documents (CDs), we provide a Construction Estimate Agreement (CEA), locking in your project price for up to 6 months while permits are processed. Timeline: 4–6 weeks
We handle the submission of plans to the city and obtain all required permits, working closely with the building department to expedite the review and approval process. Our dedicated in-house permitting team will also inform you of any plan check and permit fees that need to be paid. Timeline: 3–6 months Timeline: 4–6 weeks
We help clients select interior and exterior design materials early in the process to ensure the project stays on schedule and within budget. While your plans are under city review, you’ll make your design choices. You can choose from our standard designs in the Look Book, opt for custom finishes a la carte, or provide your own materials for us to incorporate.
With permits in hand, construction typically begins within 2–4 weeks. We manage every aspect of the process, right through to the final punch list, ensuring your ADU meets or exceeds your expectations. The timeline for this phase depends on factors such as the size of the unit and the responsiveness of city inspectors, with two-story units typically requiring an additional 3–4 weeks. Timeline: 5–7 months
Can you build a guest house on your property? How much will it cost? We are ready to dive into your accessory dwelling unit project goals so we can answer questions and get into costs and timeline right away.
We’ve created many build ready ADU designs to maximize space utilization & construction efficiency… so you get more out of your budget. We can also customize ADU house plans to fit your unique needs.
We prepare all plans and paperwork for submission to the municipality. Our own employees work with the town to ensure your ADU plans swiftly pass through required plan check and permitting processes.
As an ADU builder, we handle the entire construction process, from breaking ground all the way to the final walk-through to make sure your guest home exceeds your expectations and is built to last.
Our systems and processes keep your ADU design build job running smoothly and give you visibility on progress with our schedule. You can view documents, make approvals, and pay invoices right from your phone or computer.
We work with lenders who focus exclusively on ADU loans and who have vetted us as an approved ADU builder. We ensure you have the documentation you need to get funding for your casita.
Planning to build your accessory dwelling unit to rent? Check out how to plan for the best ADU design build to maximize rent potential.
Can you build a guest house on your property? How much will it cost? We are ready to dive into your accessory dwelling unit project goals so we can answer questions and get into costs and timeline right away.
We’ve created many build ready ADU designs to maximize space utilization & construction efficiency… so you get more out of your budget. We can also customize ADU house plans to fit your unique needs.
We prepare all plans and paperwork for submission to the municipality. Our own employees work with the town to ensure your ADU plans swiftly pass through required plan check and permitting processes.
Our curated interior & exterior ADU designs create a cohesive look for your accessory home project. Choose from our catalog of styles, or work with our ADU designers to create a custom floor plan.
As an ADU builder, we handle the entire construction process, from breaking ground all the way to the final walk-through to make sure your guest home exceeds your expectations and is built to last.
Our systems and processes keep your ADU design build job running smoothly and give you visibility on progress with our schedule. You can view documents, make approvals, and pay invoices right from your phone or computer.
We work with lenders who focus exclusively on ADU loans and who have vetted us as an approved ADU builder. We ensure you have the documentation you need to get funding for your casita.
Planning to build your accessory dwelling unit to rent? Check out how to plan for the best ADU design build to maximize rent potential.
Explore our ADU floor plan collection to jumpstart your inspiration. Start with a proven design for a faster process, or bring your own ideas—we offer custom ADUs and can adjust any plan. Our in-house designers ensure your plan aligns with property constraints and meets city permit requirements.
Looking to create a custom ADU that aligns cohesively with your property’s characteristics? Whether you’re interested in modifying an existing accessory dwelling unit floor plan, working with a strict HOA, or envisioning something completely unique, we’ve got you covered. Reach out to us to discuss the endless possibilities for your custom ADU.
At ADU360, we deeply value transparency and integrity, recognizing them as fundamental pillars in fostering strong, trust-based relationships with our clients. Our steadfast commitment to these values ensures that every project is handled with utmost honesty and ethical standards. From clear communication to transparent business practices, we strive to maintain a high level of integrity in all our dealings. This unwavering dedication has been instrumental in building and sustaining trust among our clients, solidifying our reputation as a reliable and trustworthy partner in the industry.
With meticulous attention to detail, we vigilantly track the advancement of our projects, prioritizing consistent communication with our clients regarding every milestone and deadline. Through strategic partnerships with top-tier subcontractors within our industry, we fortify our competitive advantage, consistently delivering superior results. This collaborative synergy empowers us to access specialized expertise and resources when needed, ensuring our projects are executed with precision and excellence. Our steadfast commitment to effective project management and strategic collaboration underscores our dedication to client satisfaction and the successful completion of every endeavor.
Explore our guide on what to look for in top ADU companies. Learn about the various types of ADU firms, from consultants to design-build teams, and review key questions to ask each company you consider for your backyard home project.
ADU360 is a Los Angeles based design & build construction firm that specializes in ADU developments.
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