2nd September 2025
One of the advantages of building an attached ADU is that you can often leverage the main home’s existing utilities and structural elements, thereby reducing costs. California recognizes several configurations for ADUs, each with its own pros, cons, and legal considerations. The type you choose will significantly impact your construction costs, design plans, and local permitting processes. Below is a detailed table summarizing the major types of ADUs commonly seen in the state. Following the table, we will delve deeper into each type to help you evaluate which one best suits your situation. Any accessory structure over 200 square feet in Massachusetts and southern New Hampshire requires a building permit.
With over three decades of experience, JDR specializes in whole home remodels, additions, kitchen and bathroom upgrades, and outdoor living spaces. Their unique design-build process ensures a seamless experience for clients, combining design, material selection, budgeting, and construction under one roof. Known for their innovation and excellence, JDR has earned numerous prestigious awards, including six consecutive Better Business Bureau Torch Awards for Ethics and the coveted Big50 award. The company maintains a remarkable 98% client satisfaction rate, as measured by GuildQuality, and has received Guildmaster with Highest Distinction honors for 17 consecutive years. Led by founder Todd Jackson, JDR’s team of highly skilled professionals is committed to delivering creative, personalized results while maintaining the highest standards of integrity and professionalism. These included a $250,000 second-story addition to a single-family residence and a $150,000 ADU addition.
An ADU does not create a separate legal lot; it remains accessory to the primary dwelling. In some cases, SB 9 lot splits might apply, but that follows separate rules from ADU laws. Yes, but you may face additional design constraints to maintain the historical character. You’ll typically need approval from a local historical preservation board or similar entity.
You will be surprised how fast and easily a new building can be added to the existing structure. California state law allows ADUs to be up to 1,200 square feet, but local jurisdictions may have additional limitations based on lot size and zoning. Typically, the size of the ADU should be proportional to the size of the main home and property.
CRD has been building for the Seattle community for 40 years, pioneering the design-build approach taken in the 1990s. Michael has over 30 years of building experience; Teri manages business operations and is the first point of contact for new clients. And because more housing units are needed fast, homeowners can legally rent their ADUs at or above market rental rates. Incremental Developers is a design-build firm that uses an integrated project delivery method; for you, this means a safe, quality dwelling unit that is legal and code compliant. This poolside one-bedroom ADU is a perfect example of maximizing small spaces to feel open and airy.
This phase will include an estimate of pricing for the project, the anticipated process, and the expected timeline for the completion of your new Accessory Dwelling Unit. A detached ADU plan approved by the City of Ontario within the current triennial California Building Code rulemaking cycle. Pre-approved does not mean “doesn’t require approval.” It means the City has already deemed the plan to be code-compliant assisting in reduced staff review time.
An ADU building team can help you to manage the process of ADU construction more efficiently. While dealing with all the specificities of creating architectural and design plans, ADU builders will also provide you with all kinds of construction and maintenance work. Hiring professionals can also save you time and money, as it allows for more detailed planning of all the steps. Navigating the legal and regulatory landscape surrounding ADUs can be complex. Homeowners must ensure compliance with local zoning ordinances, building codes, and permitting processes.
ADUs are becoming more popular due to updated housing regulations and their valuable versatility for homeowners. They offer private living space such as guest suites, or living options for elderly parents or young adults. As rental units, they generate income while increasing the walkability of our communities in a responsible and economical way. Generally, prefab ADUs are more cost-effective due to their efficient manufacturing and construction processes.
At Wise Builders, we also incorporate permit fees in the cost to build ADU San Jose. As a house owner, you deserve the peace-of-mind, and we make constructing an ADU in San Jose look easy because we’ve been doing it for many years. Ultimately, you decide the best fit for you, which you can seamlessly achieve with the help of San Jose ADU builders.
Get in touch with us today and take the first step towards making your casita dream a reality. Our team is ready to answer any questions you may have and help you start your journey. Each step is crafted to ensure transparency and alignment with your expectations. Whether you prefer a modern aesthetic or a more traditional feel, our portfolio of casita designs has something for everyone.
Enter your address to see where Eastern ADU can build an ADU on your property. SoCal Upgrades helped our family build a new ADU which we are now happily renting out to generate massive income…. All models can be equipped with a custom solar rack designed for 100% offset per the latest California Energy Efficiency Standards (T24). Our buildings exceed energy requirements with continuous closed-cell insulation, all-electric appliance hookup (no natural gas), and premium performance windows and doors.
For ADU design build in Cupertino, CA, message us on any of our social network pages or website. If you need a garage conversion in Campbell, California completed efficiently, call us at Wise Builders for further details. Our services in ADU construction are highly renowned, and you can find plenty of 5-star reviews for it. Our reputation for amazing service has made us the top ADU builders in Sunnyvale, CA. You do not have to search far to find the best ADU contractor in the Bay Area. At Wise Builders, we have completed construction for ADU units in the surrounding communities.
Texas-based Kanga Room Systems offers a range of sheds and ADUs that can arrive as kits or as prefabricated units. ADU Plans & Finance specializes in designing and financing Accessory Dwelling Units, offering tailored solutions to enhance property value and living space. Expand your space, enhance property value, and enjoy versatile living options at an affordable cost of ADU in Los Angeles. You can also consult professional architects, contractors, or local ADU specialists who are familiar with municipal codes and state law updates. Common types include detached ADUs, attached ADUs, garage conversions, basement conversions, Junior ADUs (JADUs), and above-garage (carriage house) units.
Attached ADUs can vary significantly in size and layout but are integrated into the fabric of the existing home, making them a seamless extension of accessory unit the primary living space. Fremont, Bay Area, Los Gatos, San Mateo, Santa Clara, Saratoga, Sunnyvale, Cupertino, Palo Alto and Belmont. If you’re in the Bay area and looking to build an ADU, please call us. Our team of experienced San Jose ADU builders and project managers is here to answer your questions, provide guidance, and work with you every step of the way. We’re committed to delivering high-quality, personalized ADU construction services to meet your unique requirements. An Accessory Dwelling Unit (ADU) is a small living space on the same property as a main house.
An accessory dwelling unit has its own entrance, kitchen, bathroom, and living space. It’s a good way to create an additional income stream whether the rental agreement is long-term or short-term. There has been an increased demand for affordable housing all over the country. As a result, more and more homeowners are building accessory dwelling units in Maryland.
The 20’ x 26’ size will fit in many different yards and the optional garage/storage under provides extra useful space for your property. With an attached garage, huge kitchen, and spacious front patio, the Cascade model is perfect for a couple or small family. Simply provide some details about your property, and we’ll check your local zoning laws to see if an ADU is a viable option for you. Schedule a free consultation to evaluate whether an ADU is an option for your property.
The benefits of renting out an ADU construction are a wise long-term investment, even if the rental expenses are high. Our ADU builders in Sacramento will have all of the necessary permits to get your project started. If the property owners work remotely, having an ADU construction is quite convenient.
