Thinking about adding an ADU but not sure where to begin? W and W Builders Group is your trusted partner for turning ideas into reality. From initial design and permits to construction and finishing touches, we handle the entire process so you don’t have to stress. Our dedicated project managers, engineers, designers, and builders work together seamlessly to deliver the perfect space—whether you’re planning a rental unit, a private guest house, or a family gathering retreat. With our expertise, your ADU project becomes smooth, stress-free, and built to last.
Detached ADU
Built as a separate structure, often in the backyard, detached ADUs function as fully independent living spaces. They’re an excellent choice if you’d like to use the unit as a rental, offering privacy for both you and your tenant.
Interior ADU
An interior ADU is created by converting an existing space within your home—such as an attic, basement, or spare room. While they may be smaller, these units often require significant remodeling to ensure they can operate as independent living spaces. The advantage is that you can transform unused areas without expanding your property’s footprint.
Attached ADU
These units connect directly to your main home but maintain their own entrance. They may be built above an existing structure or added on as an extension. Attached ADUs generally require less remodeling than interior units and work well for home offices, guest suites, or extra family space.
Delivering your dream home with precision, on schedule and within budget.
The journey to your dream ADU starts with a collaborative meeting. We’ll discuss your goals, vision and budget to understand what you’d like to accomplish.
Your dedicated project manager will then craft an in-depth proposal that outlines the overall scope of work, cost and timeline. Based on your vision, we will also include preliminary designs.
After a walk through of the space, our architect will create a detailed plan, including 3D renderings. This will give you a strong sense of what your space will look like and allow you to make any changes before demolition begins.
Our team of experts will submit the layouts to the city and handle the entire permitting process to ensure compliance with all regulations, consistently following up to make sure your plans are approved in a timely manner.
While the plans are making their way through the city, we will work together on the design, visit showrooms, help you select materials and find fixtures that fit your aesthetic.
As soon as we secure the permits, our expert ADU contractors will begin construction. This step includes constructing your ADU, demoing existing spaces that are no longer needed and installing essential systems.
This is the fun part! You’ll get to see your vision come to life as we add in your interior finishes, custom features and landscaping. We’ll also go through an in-depth walk through with you to make sure every part of your ADU exceeds your expectations.
At the end, we’ll finalize any necessary touch-ups before we welcome you into your ADU!
Choosing the right team for your ADU project brings peace of mind. With W and W Builders Group, you’re partnering with a trusted ADU builder known for expertise, personalized service, and full support from start to finish.
From our very first conversation, we take the time to understand your lifestyle and vision so we can create an ADU that aligns seamlessly with your goals. Our team guides you through every stage—blueprinting, permits, design, and construction—with meticulous attention to detail.
Our dedication to quality and your satisfaction speaks for itself. At W and W Builders Group, you’re never just a project—you’re part of the family.
The length of time it takes to build an ADU depends on the size, scope, and type of unit you’re creating. Since ADU construction involves multiple steps, each stage affects the overall timeline.
Planning – This stage generally takes between 2–4 months. It includes the initial consultation, walk-throughs, design development, and creating the scope of work proposal.
Permitting – The permitting process can vary greatly depending on project complexity. Our team prepares the architectural plans based on your goals, submits them for review, manages revisions, and follows up to keep your project moving smoothly.
Construction – The build phase depends on the size and complexity of the ADU. Beyond construction itself, this stage includes installing plumbing, electrical, and other essential systems required for a fully functioning living space.
Overall Timeline – Every ADU project is unique, so the total duration can vary significantly. Your dedicated project manager will provide clear expectations and regular updates, ensuring you understand the schedule and can plan accordingly.
The cost of an ADU project can vary significantly depending on the size, design, finishes, and type of ADU you choose—whether it’s detached, attached, or interior. On average, projects can range from $150,000 to $400,000 or more, with smaller conversions generally on the lower end and larger, ground-up builds on the higher end.
Key factors that impact the overall price include:
Size and layout of the ADU
Structural changes required
Quality of finishes and materials
Plumbing, electrical, and mechanical needs
Permit and city fees
When you work with our team, you’ll receive a detailed scope of work and transparent pricing so you know exactly what to expect. We also guide you in making cost-effective choices without sacrificing quality, ensuring your ADU is a smart investment that adds long-term value to your property.
There are three main types of ADUs, each offering unique benefits depending on your needs:
Detached ADU – A stand-alone structure built separately from the main home. Great for rental income, guest houses, or private living spaces, these provide the most independence and privacy.
Attached ADU – Connected to the main home but with its own entrance. These can be built as extensions or above an existing structure, making them ideal for extra family space or a home office.
Interior ADU – Created by converting existing space inside the home, such as a basement, attic, or unused rooms. While these often require more remodeling, they’re a great way to maximize square footage without expanding the property footprint.
Each type can be customized to fit your goals—whether you’re looking for additional income, family space, or long-term investment value.
Yes—adding an ADU is one of the smartest ways to increase property value. A well-designed ADU not only expands your usable living space but also creates opportunities for rental income, multi-generational living, or flexible guest accommodations. Buyers often see ADUs as a major advantage, which can make your property more attractive on the market and boost resale value.
Financing a new ADU can be approached in several ways, depending on your budget and long-term goals:
Home Equity Loan or Line of Credit (HELOC): Allows you to borrow against the equity you’ve already built in your home.
Cash-Out Refinance: Replaces your existing mortgage with a larger one, giving you funds to cover ADU construction.
Construction Loan: Short-term financing that covers building costs, which can later be converted into a traditional mortgage.
Personal or Renovation Loan: Flexible options for smaller projects or homeowners who prefer not to use home equity.
Special ADU/Green Financing Programs: Some lenders and local governments offer tailored loans or incentives for accessory dwelling units.
Our team can help you explore which option best suits your situation, ensuring your ADU is not only a functional space but also a smart financial investment.
Successful ADU construction starts with thoughtful planning. Here are the key steps:
Define Your Goals: Decide how you’ll use the ADU—rental income, guest space, or family living.
Set a Budget: Factor in design, permits, construction, and finish materials.
Explore Design Options: Work with a designer or builder to create a layout that fits your lifestyle and property.
Understand Regulations: Research local zoning, setback requirements, and building codes before moving forward.
Hire the Right Team: Choose an experienced design-build contractor who can manage the entire process, from permits to construction.
With expert guidance, your ADU project can move smoothly from concept to completion, ensuring you get a space that adds both function and value to your property.
