Licensed ADU Builder for Accessory Dwelling Units & Garage Conversions
An Accessory Dwelling Unit (ADU) offers homeowners flexibility, rental income potential, and extra space for the family. However, building one requires specialized knowledge: you'll need to navigate California ADU laws, secure permits, coordinate utility connections, and optimize your design for the available space.
Straight Edge Builders is your licensed ADU construction contractor (B License #1075936). We handle every step: from site assessment and architectural planning to construction and final inspection.
ADU Building Contractors You Can Trust
An ADU isn't just another remodeling project. You're building a complete, independent living space with its own foundation, utilities, kitchen, and bathroom. Our design-build approach keeps things simple: one team manages every phase of your project.
Our team knows the Inland Empire's zoning rules and building codes inside and out. This expertise helps us move your project smoothly from initial plans through final approval.
ADU building contractors face unique challenges compared to general contractors. California's ADU laws come with specific regulations covering setback minimums, parking exemptions, and utility standards. We stay current on these requirements so your project moves forward without unnecessary delays.
What Is an ADU and Why Are They Increasingly Popular?
An ADU is a secondary housing unit built on the same lot as your primary residence. It's a fully independent living space with its own kitchen, sleeping area, and bathroom.
Homeowners are increasingly choosing ADUs for good reasons:
- Income Potential: Rent out the unit for steady passive income.
- Family Space: Create private housing for aging parents, adult children, or extended family.
- Flexible Use: Perfect for a home office, gym, art studio, or guest quarters.
- Property Value: A permitted ADU immediately increases your home's market value.
California has made building ADUs easier than ever. Recent law changes reduced setback requirements to just 4 feet and relaxed parking rules. These updates make now an ideal time to add an ADU to your property.
ADU Construction Company Specializing in Multiple Unit Types
We build every type of Accessory Dwelling Unit. Our team will help you choose the style that fits your lot size and meets your goals.
- Detached ADUs (Backyard Cottages): Stand-alone buildings separated from your main home. These offer maximum privacy for tenants or family members.
- Attached ADUs: Connected to your main house and sharing at least one wall. This design typically costs less to build.
- Garage Conversion ADUs: We transform your existing garage into a fully permitted living space. This is often the fastest and most affordable ADU option.
- Junior ADUs (JADUs): Compact units under 500 sq. ft. built entirely within your existing home's walls.
- ADUs Over Garages: New living space built on top of an existing or new garage. This design maximizes your lot's vertical space.
- Multi-Room ADU Layouts: Units designed with separate bedrooms to boost rental income potential.
We also handle home additions when you need to expand your main residence alongside your ADU project.
ADU Construction Services: Design & Material Selection
We'll work closely with you to create a unit that's both practical and attractive. Your ADU should complement your main home while functioning as a complete living space.
- Floor Plans: We design efficient layouts that make every square foot count. Our plans prioritize natural light, good flow, and privacy.
- Kitchens & Bathrooms: Full kitchens and bathrooms built to code with durable, attractive finishes. We apply our kitchen remodeling and bathroom remodeling expertise to every ADU project.
- Storage: Smart built-in shelving and closet solutions designed specifically for small-space living.
- Exterior Match: We match your ADU's roof line, siding, trim, and windows to your main house for a cohesive look.
- Materials: Choose from durable, budget-friendly finishes ideal for rentals, or upgrade to premium materials.
CA ADU Contractor: Understanding ADU Construction Costs
ADU costs depend heavily on which type you build. Full construction projects include foundation work, roofing, complete utility hookups, and all interior finishes.
| ADU Type (Cost Range) | Primary Cost Factors |
|---|---|
| Garage Conversion ADUs | Most affordable. Costs driven by utility hookups, finishes, and slab condition. |
| Attached ADUs | Mid-range pricing. Costs depend on shared wall work and utility access. |
| Detached ADUs (New Build) | Highest cost. New foundation, framing, utility trenching, and finishes required. |
| Junior ADUs (JADUs) | Lowest cost. Minor plumbing and electrical changes only. |
The biggest cost variables include utility trenching for sewer, water, and electrical lines. Structural complexity, insulation requirements, and your finish selections also significantly impact the final price. We'll provide a detailed, line-item estimate during your consultation.
We're happy to discuss financing options for your ADU project, though specific loan terms vary by lender.
ADU Construction in California: Permit Requirements & Regulations
ADU permitting has its own unique requirements. While state law has simplified the process, local jurisdictions still control specific fees and timelines. That's where our expertise makes a real difference.
- California ADU Laws: We ensure your project complies with all state mandates designed to encourage ADU development.
- Permitting Timeline: Our experience with local building departments helps us secure approvals faster than typical homeowner applications.
- Setback and Height Restrictions: We design within the 4-foot setback requirements while maximizing your usable space and following all zoning rules.
- Utility Requirements: We manage all required electrical meters, sub-meters, and plumbing/sewer connections.
- Structural Engineering: We coordinate all necessary engineering for new foundations, two-story ADUs, and garage conversions.
California ADU Builder: Our Complete Build Process
We've streamlined ADU construction into five clear steps:
1. Consultation & Site Assessment: We meet at your property to discuss your goals, evaluate feasibility based on your lot and zoning, and take detailed measurements.
2. Architecture, Design & Engineering: We work with specialized designers and engineers to create code-compliant blueprints.
3. Plans & Permits Submission: We handle all plan submissions to your local building department and manage any required revisions.
4. Construction & Project Management: Our licensed crews maintain a consistent daily schedule, keep the site clean, and coordinate all subcontractors.
5. Final Inspection & Move-In: We manage final inspections and utility connections so your ADU is ready to use.
ADU Design-Build: Why Choose Straight Edge Builders
- Licensed General Contractor: We hold California contractor License #1075936, with full bonding and insurance.
- Full Design-Build Approach: One team handles everything—design, plans, permits, and construction. No juggling multiple contractors.
- Permit Navigation: We know the local ADU regulations that keep projects moving forward.
- Clear Communication: Expect regular updates at every stage of your project.
- Quality Craftsmanship: We use durable materials and proven construction methods built to last.
- Transparent Pricing: Our detailed estimates spell out every cost. No surprises.
- Local Experience: Serving homeowners throughout the Inland Empire. Check our service areas to see if we build in your city.
View ADU Projects & Garage Conversions
We've built detached ADUs and garage conversions that generate real rental income for local homeowners. View
our portfolio to see completed projects.
What Our Clients Say About Our ADU Construction Services
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"Straight Edge Builders did a great job navigating the complexities of converting our two-story garage to a new home for my parents. They stuck with us as we worked to overcome mistakes by the architects (don’t hire Powell & Associates) and permitting issues. They always had someone working so we never felt abandoned for another job. This was important because we needed it done as soon as possible. This project was unique for a variety of reasons. The property is a historic landmark which required them to work well with our consultant and other specialty contractors. They balanced preservation requirements with modern design and handicapped accessibility throughout. Overall, Mitch and Dustin exceeded expectations at every turn. They expertly customized the project to our unique needs. We would highly recommend them for any project that requires skill, adaptability, and a high level of care."
- Melissa B.
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“Great company to work with! They are extremely knowledgeable in their trade, And do absolutely amazing work! Would definitely recommend to one of my friends and family!”
- David T.
ADU Builder – Frequently Asked Questions
What is an ADU and why build one?
An ADU is an Accessory Dwelling Unit—a secondary residence on your property with its own kitchen, bathroom, and sleeping area. Homeowners build them to generate rental income, house extended family or aging parents, and boost property value. They're a smart way to maximize your existing lot while addressing California's housing needs. Learn more about ADUs on our full home remodeling page.
How much does building an ADU typically cost?
Garage conversions are usually the most affordable option, while new detached construction costs the most. Your final price depends on utility hookups, unit size, structural work, and finish quality. After we assess your site, we'll provide a detailed estimate covering all costs, including foundation, trenching, permits, and materials.
What are the permit requirements for ADUs?
You'll need permits for design approvals, structural work, and utility hookups to meet California building codes. State law has simplified the process, but your local jurisdiction controls specific fees and timelines. We handle the entire permitting process and coordinate all inspections with your building department.
Do you offer design/build services for ADUs?
Yes. Our services include managing the complete design-build process from start to finish. This includes architectural plans, structural engineering, permit approvals, and construction. Working with one team throughout your project means better communication, tighter quality control, and faster completion.
Can I finance an ADU construction project with Straight Edge Builders?
Request Your ADU ConsultationWe don't provide direct lending, but we'll discuss financing options during your consultation. We also refer clients to local lenders who specialize in ADU and home improvement loans. Most homeowners fund their ADU through home equity loans, construction loans, or cash-out refinancing.
Start Your ADU Project Today
Ready to transform your property with a quality ADU? Contact Straight Edge Builders for a free consultation and detailed project estimate.
Call Us: (909) 682-6053
Licensed & Insured: California Contractor License #1075936