Custom ADUs by OneStop ADU Builders in San Diego
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What Is a Custom ADU?
There are two main types of ADUs: pre-designed and custom. Pre-designed ADUs are quicker and more budget-friendly. You pick a floor plan that works for your space, and everything else (like finishes and layout) is mostly set. It’s a simple option if you want to build fast and keep costs down.
A custom ADU gives you way more freedom. You can move walls, change the layout, pick every finish, and design it exactly how you want. It costs more and takes longer, but you get a space that’s fully your own.
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What Is a Semi-Custom ADU?
A semi-custom ADU sits between a standard plan and a fully custom build. It’s not the most common option, but it’s a smart one if you want more freedom in the ADU design without going all-in on time and ADU cost. You start with a base plan that’s already approved, then tweak some things, like floor layout, windows, finishes, or where the walls go.
It’s more flexible than picking a plan off the shelf, but much simpler than starting from scratch. If you want a space that feels personal without the full custom process, this is a solid choice.
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Browse ADU Floor Plans for Inspiration
A compact layout with a sliding door, full kitchen, large closet, and stackable washer/dryer.
Separate bedroom, walk-in closet, full kitchen, and open-plan living/dining.
Great for roommates or guests. Includes two bedrooms, shared bath, and kitchen with island.
Two full bathrooms, spacious kitchen with island, and dedicated living room.
For families or rentals. Includes a large living area and private master suite.
Our largest plan. Includes a big kitchen with island, two full baths, and plenty of space to spread out.
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How Much Does a Custom ADU Cost in San Diego?
It’s really hard to give a single number for custom ADU builds because “custom” means something different for everyone. Size, layout, materials, and site conditions all affect the final cost. You may choose extra bedrooms, premium finishes, or unusual shapes – all that impacts the budget. Because of that, if you’re planning a custom ADU, the best step is a personalized quote based on your plan and property.
About Us
Custom ADU Design by OneStop ADU: Precision and Personalization
Our custom ADU builders completed a lot of different custom built ADU projects all across San Diego, each one fully personalized to each owner’s taste and needs. No matter the size or complexity, our team is ready to make it happen – from first idea to final inspection. If you’re looking for a fully personalized ADU that fits your needs exactly, we’re here to help.
Explore Our Custom ADU Projects
One example is the Studio Spanish Style in Escondido – a compact but very stylish unit with a warm, classic design. Inside, it has bright, open spaces, a fully equipped kitchen, and quality finishes that make the most of every square foot.
Another standout our custom ADU builder completed is the Custom 2 Story Stacked ADU in San Diego’s “College Heights.” We maximized a tight lot by going vertical. The result is a modern unit with spacious interiors, two floors of living space, and its own private balcony. It includes a full kitchen, laundry, and thoughtful storage throughout.
Designing Your Custom Guest House to Fit Your Needs
One example is the Studio Spanish Style in Escondido – a compact but very stylish unit with a warm, classic design. Inside, it has bright, open spaces, a fully equipped kitchen, and quality finishes that make the most of every square foot.
Another standout our custom ADU builder completed is the Custom 2 Story Stacked ADU in San Diego’s “College Heights.” We maximized a tight lot by going vertical. The result is a modern unit with spacious interiors, two floors of living space, and its own private balcony. It includes a full kitchen, laundry, and thoughtful storage throughout.
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Custom Granny Flat Solutions in San Diego
Choose a layout that fits your space and how you want to use it. Like a studio, a one-bedroom, or something bigger - whatever you like.
You can match your main house or go with something totally different. Pick the roof, siding, paint, windows, and doors that you like most.
You’ll get to choose the counters, cabinets, tiles, fixtures, and appliances. We’ll help you find options that look good and make sense for your budget and preferences.
Flooring, paint, lights. trim - you can choose all the details that make the space feel like your own.
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The Design-Build Advantage for Custom ADUs
- Expertise and Experience in Custom ADU Construction. As custom ADU builders, we’ve done this a lot – and we know how to make it smooth. You tell us your ideas, and we use our know-how to build.
- Transparent ADU Pricing and Budgeting. We’ll break everything down clearly, so you know what to expect. No tricks, no hidden fees.
- Streamlined ADU Permitting and Regulations. Dealing with city rules isn’t fun, so we take care of that part. We know what’s needed and get it done without wasting time.
- High-Quality Craftsmanship for Custom ADUs in San Diego. We care about how things look and how they’re built. We care about our reputation, so we aim at the best possible quality.
- Stress-Free ADU Building Process with Full Accountability. We handle everything from start to finish, so you can relax and watch it come together.
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Choosing the Right Custom ADU Builder in San Diego
Building a custom ADU in San Diego should feel exciting. At OneStop ADU, we make the whole process easier by handling everything for you, including city paperwork and construction. We’re locals, so we know what works in San Diego and what doesn’t.
Do you already have ideas or need help choosing from our ADU floor plans? We’ll help you find or create something that fits your needs best. As your go-to ADU contractor, we’re here to build exactly what you’re dreaming of.
Tell us what you want – we’ll help you make it real.
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Frequently Asked Questions
How Can a Custom ADU Increase Home Value?
A custom ADU can increase home value by adding functional living space that enhances your property’s overall appeal. It provides additional square footage that potential buyers or renters may find attractive, offering opportunities for rental income, extended family accommodations, or home office space. A well-designed custom ADU can make your property stand out in the real estate market.
How Should I Budget for a Custom ADU Project?
When budgeting for a custom ADU project, consider both soft costs (design, permits, consultations) and hard costs (construction, site preparation, finishes). It’s essential to factor in any additional expenses, such as utility connections and labor, and allocate funds for unexpected costs that may arise during construction. Working with a professional builder like OneStop ADU can help you get a more accurate estimate tailored to your specific needs and location.
How Do I Get Started with a Custom ADU?
To get started with a custom ADU, first assess your property to determine its suitability for an ADU. Next, consult with a professional builder like OneStop ADU to discuss design options, permitting, and construction timelines. You’ll need to secure necessary permits and finalize your budget before construction begins. A custom ADU project involves careful planning, so working with an experienced team can help streamline the process and ensure a successful outcome.
Is My Property Eligible for a Custom ADU?
To determine if your property is eligible for a custom ADU, you need to consider factors like zoning laws, lot size, and local building codes. A professional builder like OneStop ADU can help assess your property’s eligibility by reviewing these requirements and guiding you through the permitting process to ensure your project complies with local regulations.
What Is the Typical Process for a Custom ADU Project?
The typical process for a custom ADU project starts with a feasibility study, where a contractor or design professional reviews your property and local regulations to determine what can be built. Next, you’ll work with a designer to create a custom floor plan and select finishes, which usually takes several months. Once the design is finalized, the project plans are submitted for approval to your local jurisdiction, and the permitting process begins, which can vary depending on the location. After the permits are approved, construction begins and typically takes between six to nine months, depending on the complexity of the project. Working with a professional builder like OneStop ADU ensures that all phases are handled efficiently and in compliance with local regulations.
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