ADU Planning Permits: An In-depth Resource for Homeowners
- GA 8
- Mar 24
- 5 min read

Table of Contents
What is an ADU and JADU?
Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) are becoming popular housing solutions in many areas. These small, independent living spaces are typically built on the same lot as a single-family home or apartment complex. ADUs and JADUs offer affordable and flexible living options, whether as rental units, guest houses, or spaces for family members.
While an ADU can be a fully separate dwelling with its own entrance, kitchen, and bathroom, a JADU is often a smaller unit, such as a converted bedroom or a section of the house with its own bathroom but shares the kitchen with the main home. Both options are great ways to make use of extra space on your property.
Before jumping into building one of these units, it’s essential to understand the different construction plans available, as well as the permits and regulations involved.
Types of ADU Construction Plans
When considering ADU construction plans, there are several different options to explore depending on your property and the zoning laws in your area.
The most common ways to build an ADU are through garage conversions, general conversions of existing spaces, or new construction. Each has its benefits and challenges.
Garage Conversion:
If you have an existing garage on your property, you may be able to convert it into an ADU or JADU. This is a cost-effective solution, as it uses existing space that is typically underutilized. Converting a garage is often easier than building from the ground up because it requires fewer changes to the structure of the building.
General Conversion:
Another option for an ADU is to convert any habitable space within your home. Rooms like recreation areas, gyms, or even large closets can be transformed into small, private living spaces. This kind of conversion is ideal for homeowners who don’t have a garage but have extra space they aren’t using effectively.
New Construction:
If your lot’s zoning density allows, you can build a completely new ADU or JADU. New construction offers the flexibility to design the unit exactly as you want. For single-family homes, this can be a detached or attached structure, depending on the zoning laws. For apartments, however, the ADU or JADU must be a detached unit.
Each construction type requires a different approach, and working with an experienced ADU contractor can help ensure you follow the correct steps and comply with local regulations.
Understanding Permits for ADU Construction
When planning to build an ADU, securing the right permits is a critical step in the process. Local regulations vary, so it’s important to familiarize yourself with your city’s or county’s rules.
Most jurisdictions require permits for any ADU construction, whether it's a conversion or a new build. For instance, if you're converting a garage or another existing space, you may still need to submit plans to ensure that the conversion complies with safety and zoning regulations.
Similarly, new construction will need extensive permitting to verify that the project meets all local codes, including accessibility, parking requirements, and more.
Another key component to consider is how your ADU will impact the overall infrastructure of the area. Permits for new ADUs might also require utility assessments and an inspection of existing systems like plumbing, electrical, and sewage to ensure they can handle the added load. Additionally, some cities have specific rules for the size, style, and placement of ADUs to maintain the neighborhood’s aesthetic and safety standards.
Working with a trusted ADU contractor can help simplify this process. They can guide you through obtaining the necessary permits and ensure that everything is compliant with local codes.
Why Choose an ADU Contractor Near Me?
Choosing an experienced ADU contractor is essential for anyone planning to build an ADU or JADU. An experienced contractor knows the ins and outs of local regulations and can offer valuable advice to help you stay within budget and schedule.
Hiring a local ADU contractor also has the advantage of familiarity with the area’s unique building codes and requirements. They can help you navigate zoning laws, handle permits, and ensure that the project meets all necessary standards. Since ADU construction can vary from one locality to another, working with a contractor close by can ensure a smoother, more efficient process.
Furthermore, local contractors have established relationships with suppliers and subcontractors, which can help keep your project on track. They also understand the climate and other environmental factors in your area that may affect construction, such as materials suited for local weather conditions.
In short, hiring an ADU contractor means you’ll be working with someone who knows the area well, has a network of trusted professionals, and is familiar with the nuances of local building codes.
The Key to Successful ADU Construction Plans
In conclusion, ADUs and JADUs offer a smart, flexible solution to address housing needs. Whether you choose to convert an existing space or build a new unit from scratch, careful planning and adherence to local regulations are essential for success.
Understanding the types of ADU construction plans—whether a garage conversion, general conversion, or new build—will help you decide what fits best for your property and needs. At the same time, securing the right permits and working with an experienced ADU contractor near me will ensure that your project progresses smoothly and stays on track.
If you’re ready to start your ADU project, don’t hesitate to reach out to a trusted contractor who can guide you through the process from start to finish. Contact us at 121 Design Build Inc. for a free consultation to discuss your ADU construction plans today.
What is the difference between an ADU and a JADU?
An ADU is a fully independent living space with its own kitchen and bathroom, while a JADU is a smaller, more affordable unit that may share some facilities with the main home.
Do I need a permit for an ADU?
Yes, most jurisdictions require permits for any type of ADU construction, including conversions and new builds. Check with your local building department for specific requirements.
Can I convert my garage into an ADU?
Yes, garage conversions are a popular option for creating an ADU. You’ll need to ensure that your garage meets the necessary requirements and that the conversion follows local codes.
How long does it take to build an ADU?
The timeline for building an ADU depends on several factors, including the type of construction, the complexity of the project, and permit approval times. On average, it may take a few months to a year.
How much does it cost to build an ADU?
The cost of building an ADU varies based on factors like size, design, and location. It's best to get a detailed estimate from an experienced ADU contractor to understand the full cost of your project.
Read Also: The Best Way to Design an ADU in Los Angeles