Licensed ADU Builder for Accessory Dwelling Units & Garage Conversions
An Accessory Dwelling Unit (ADU) is a smart investment for homeowners. It provides great flexibility, rental income, or extra space for family.
Building an ADU needs special knowledge of California ADU laws. It also involves complex permits, utility connections, and smart design to use space well.
Straight Edge Builders is your licensed ADU builder (B License #1075936). We manage the whole process such as site assessment, architecture, construction, and final inspection.
We focus on making the most of your property. We build high-quality, valuable ADUs on time and within budget.
Build a Functional, High-Value ADU With a Licensed Specialist
Building an ADU is very different from a regular home remodel. It means creating a separate unit that has its own foundation, utilities, kitchen, and bathroom.
Our full design-build approach means we are the single point of contact for every phase.
We know the zoning rules and building codes in the Inland Empire. This helps make the process from plan submission to final approval smooth.
We promise clear communication and daily updates. This is why homeowners trust us to handle their important investment with less stress.
What Is an ADU and Why Are They Increasingly Popular?
An ADU is a secondary, independent housing unit built on the same lot as a primary residence. They offer full living facilities, including a permanent kitchen, sleeping area, and bathroom. Their rising popularity is driven by key benefits:
- Income Potential: ADUs are excellent rental income properties, offering a stable passive income stream.
- Family Space: They serve as ideal, private housing for extended family, aging parents (in-laws), or boomerang children.
- Flexible Use: Perfect for a large home office, gym, artist studio, or guest quarters.
- Equity Value: Building a permitted, high-quality ADU immediately and significantly increases your overall property value.
Recent updates to California ADU law have made it easier to build. They have simplified capacity and reduced setback requirements to just 4 feet. Parking rules have also been relaxed. This makes now the best time to build.
Types of ADUs We Build
We provide specialized construction services for all types of Accessory Dwelling Units. We make sure the style fits your lot and meets your investment goals
- Detached ADUs (Backyard Cottages):
These are separate buildings located away from the main home. They provide great privacy for tenants or family.
- Attached ADUs:
These are units that are connected to the main house. They often use part of the main structure and share walls to save money.
- Garage Conversion ADUs: Transforming an existing garage structure into a habitable, fully permitted living space. This is often the most cost-effective and fastest ADU option.
- Junior ADUs (JADUs): Smaller units (under $500 \text{ sq. ft.}$) contained entirely within the existing walls of the main house, requiring only minor exterior modifications.
- ADUs Over Garages:
You can build a new unit above an existing or new garage. This uses vertical space when the lot size is small.
- Multi-Room ADU Layouts: Designing layouts with separate bedrooms to maximize rental income potential and functionality.
- High-Efficiency ADUs: Utilizing advanced insulation, solar integration, and low-energy appliances to minimize operating costs and maximize tenant appeal.
We also assist with related expansions, such as Home Additions and Full Home Remodeling, to ensure a cohesive property transformation.
ADU Design & Material Selection
Functionality and durability are paramount in ADU design. Our team works closely with you to make sure the unit is useful and looks good with your main home.
- Floor Plans & Functionality:
We create efficient layouts that use every square foot. We prioritize flow, natural light, and privacy, even in smaller units.
- Kitchens & Bathrooms: Designing full, functional ADU kitchens and bathrooms that are durable, stylish, and meet all code requirements.
- Storage Maximization: Integrating smart storage solutions, built-in shelving, and closet space crucial for small-space living.
- Exterior Cohesion:
Make sure the roof line, siding, trim, and windows of the new ADU or converted garage match the main house. This helps protect your property’s curb appeal.
- Material Options: We offer a variety of materials. Choose from affordable, durable finishes that are great for rental properties or premium upgrades.
How Much Does an ADU Cost?
ADU costs vary significantly based on unit type and complexity, as they involve full-scale construction (foundation, roofing, utilities, interiors).
| ADU Type (Cost Range) | Primary Cost Factors |
|---|---|
| Garage Conversion ADUs | Least expensive. Cost driven by utility hookups, interior finishes, and existing garage slab condition. |
| Attached ADUs | Mid-range. Cost driven by shared wall complexity and utility access. |
| Detached ADUs (New Build) | Most expensive. Cost driven by new foundation, structural framing, long utility trenching, and finishes. |
| Junior ADUs (JADUs) | Lowest range. Cost driven by minor plumbing/electrical changes within the existing house footprint. |
ADU costs can vary a lot. This depends on the type of unit and how complex it is. Building an ADU involves full construction, including the foundation, roofing, utilities, and interiors.
Key cost influences include utility trenching (sewer, water, electric), structural complexity, insulation requirements, and interior finishes chosen. We provide a transparent, detailed, line-item estimate during your consultation.
We can also discuss potential financing options for ADU construction, though specific terms depend on individual lenders.
ADU Permit Requirements & Regulations
Navigating the unique permitting landscape for ADUs is our specialty. State law has made some things easier, but rules are still strict. Local areas still control fees and processes.
- California ADU Laws: We ensure full compliance with state mandates that prioritize ADU development, often overriding restrictive local ordinances.
- Permitting Timeline: We expedite the submission process, leveraging our experience to secure necessary approvals faster than typical homeowner-led applications.
- Setback and Height Restrictions:
We design with simple setbacks, usually $4 \text{ feet}$ from the side and back. This helps us maximize usable space while following zoning rules.
- Utility Rules: Managing the required separate electrical meters, sub-meters, and crucial plumbing/sewer tie-ins.
- Structural Engineering: Required for new foundations, two-story ADUs, and garage conversions involving structural changes. We manage this entirely.
Our ADU Build Process (Start to Finish)
Our systematic five-step process provides full transparency and control over your ADU construction project:
- Consultation & Site Assessment:
We will meet you at your property to talk about your goals. Next, we will check if an ADU is possible based on your lot size and zoning. Lastly, we will gather important measurements and site details.
- Architecture, Design & Engineering: We collaborate with specialized designers and engineers to create permitted blueprints that meet all structural, aesthetic, and functional requirements.
- Plans & Permits Submission:
We handle the whole process of submitting plans to the city or county building department. We also manage all revisions needed to get final permits.
- Construction & Project Management:
Our licensed team starts construction on time. We follow our daily schedule and keep the worksite clean. We also manage all subcontractors, like plumbing and electrical, efficiently.
- Final Inspection & Move-In: We handle all final inspections and set up the needed utility connections. This ensures your ADU is ready for you to move in.
Why Homeowners Choose Straight Edge Builders for ADUs
Building an ADU is a major structural and financial commitment—don't trust it to a contractor without proven experience.
- Licensed General Contractor: Fully licensed and insured (License #1075936), essential for legally handling structural and utility work.
- Full Design–Build Approach: One contractor handling design, plans, permits, and construction for streamlined accountability.
- Permit Navigation Expertise: Deep familiarity with local ADU regulations to minimize approval delays.
- Transparent Communication: Clear, regular updates throughout the long process, ensuring peace of mind.
- High-Quality Craftsmanship: We use durable materials and specialized construction techniques for long-term rental or residential use.
- Fair, Transparent Pricing: Detailed estimates that prevent hidden costs or unexpected budget overruns.
View ADU Projects & Garage Conversions
We've helped local homeowners unlock thousands in rental income and property value by constructing beautifully functional detached units and professional garage conversions. See examples of our past work:
View Portfolio.
Related Remodeling Services
As your trusted general contractor, we can easily combine your new ADU construction with other property upgrades
ADU Builder – FAQs
What is an ADU and why build one?
An ADU is an Accessory Dwelling Unit—a secondary, independent residence on your property. They are popular for generating rental income, providing housing for family, or increasing property value.
How much does building an ADU typically cost?
Costs vary significantly by type (e.g., garage conversion is cheaper than new construction). We provide a detailed estimate after a site assessment, factoring in utility hookups, size, and interior finishes.
What are the permit requirements for ADUs?
ADUs require permits for design, structural work, and utility hookups. State law has made many rules simpler. However, we handle the whole permit application and inspection process with local building departments.
Do you offer design/build services for ADUs?
Yes, we specialize in the full design-build approach, managing everything from architectural plans and engineering to permit approvals and final construction.
Can I finance an ADU construction project with Straight Edge Builders?
Request Your ADU ConsultationWhile we do not provide direct lending, we can discuss potential financing options suitable for construction loans and provide referrals to lenders specializing in ADU projects.