Accessory Dwelling Units
Looking to maximize your property’s potential? A custom-built Accessory Dwelling Unit (ADU) is a smart solution for adding living space, creating rental income, or providing a private space for family. At Diamond L Contracting, we specialize in building high-quality ADUs tailored to fit your home and lifestyle.
Whether you need a detached guest house, an in-law suite, or a backyard rental, our team has the experience and craftsmanship to bring your vision to life.
Let’s Discuss Your Needs
The Advantages of Building an ADU with Us
List of Services
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Custom DesignCustom Design
Tailored layouts that match your existing home and property.
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High-Quality ConstructionHigh-Quality Construction
Built with durability, functionality, and aesthetics in mind.
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End-to-End ServiceEnd-to-End Service
We handle everything — planning, permitting, construction, and final touches.
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Increase Property ValueIncrease Property Value
An ADU adds significant resale value and versatility to your home.
Materials & Techniques
We use premium materials and proven construction methods to deliver durable, efficient, and comfortable ADUs:
Energy-Efficient Framing & Insulation
Use of advanced framing techniques, spray foam, and rigid insulation to ensure year-round comfort and energy savings.
Durable Flooring Options
Choices like luxury vinyl plank (LVP), engineered hardwood, or tile — perfect for long-term use in independent living spaces.
Modern Ceiling & Lighting Solutions
Installation of vaulted ceilings, recessed lighting, and noise-reduction materials for a polished, quiet environment.
Heating, Cooling, & Ventilation Systems
Properly sized HVAC systems ensure comfort across seasons with smart energy usage.
Custom Features & Finishes
Built-in cabinetry, kitchenettes, ADA-compliant options, smart home integrations, and private entries customized to your needs.
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Our Process
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How We Work
List of Services
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ConsultationConsultation
We meet to discuss your ideas, needs, and property layout.
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Design and PlanningDesign and Planning
Custom plans created to fit your property and local regulations.
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PermittingPermitting
We manage all permit applications and city approvals.
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ConstructionConstruction
Skilled team builds your ADU with quality materials and craftsmanship.
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Completion and Move-InCompletion and Move-In
Final walkthrough and handoff of your brand-new space.
Frequently Asked Questions
What is an Accessory Dwelling Unit (ADU)?
An ADU is a secondary, self-contained living space built on the same lot as an existing home. It can be attached, detached, or converted from existing spaces like garages or basements. ADUs are often used for guest housing, rental income, or private living spaces for family members.
How long does it take to build an ADU?
The timeline can vary depending on the size, design, and permitting process, but most ADU projects take between 4 to 8 months from initial planning to final inspection.
Do I need permits to build an ADU?
Yes, permits are required for ADU construction. Our team handles all necessary permitting and works closely with local building departments to ensure your project meets all zoning and code requirements.
Can you build detached and attached ADUs?
Yes! We offer both detached ADUs (separate structures) and attached ADUs (units connected to the main home) based on your property, goals, and local regulations.
Still Have Questions?
Can’t find the answer you’re looking for? Read more on our FAQs page.