ADU Contractor · Beaverton, OR

Beaverton ADU Construction: Built Right, Built to Last

Coastal ADU designs and constructs compliant, high-performance Accessory Dwelling Units in Beaverton, adding value and versatile space to your property.

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Coastal ADU
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CCB #234567
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Beaverton City Experts
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Serving Beaverton
ADU Contractor Specialists

Building ADUs in Beaverton: Our Approach

In Beaverton, an Accessory Dwelling Unit isn't just an extra room; it's a strategic investment in your property's future. We approach every ADU build with a deep understanding of local zoning ordinances, including the specific setbacks and height restrictions prevalent in areas like Cedar Hills or along the Fanno Creek Trail, which means your project starts on solid regulatory ground. Our process begins with a thorough site analysis, considering factors like soil composition, drainage patterns typical of the Willamette Valley, and existing utility access to inform the foundation and structural design. We specify materials like fiber cement siding for its resistance to Oregon's wet climate and high-efficiency windows to meet stringent energy codes, because durability and long-term performance are non-negotiable. From the initial architectural drawings to the final inspection, we manage every detail, ensuring the framing is plumb, the electrical systems are meticulously routed, and the finishes reflect a standard of genuine craftsmanship.

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Our ADU Contractor Services

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Attached ADU

Attached ADU

Attached ADU construction integrates a new living unit directly into your existing home's structure, often through a garage conversion or basement build-out. This approach maximizes existing space and leverages shared utilities, offering a cost-effective path to expanding your property's functionality.

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Detached ADU

Detached ADU

A detached ADU project involves constructing a completely separate living unit on your property, including its own foundation, framing, roofing, and utility connections. This creates a fully independent space, adding significant property value and versatile functionality for guests, family, or rental income.

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Garage Conversion

Garage Conversion

Garage conversion transforms an existing garage structure into a fully functional accessory dwelling unit (ADU), including structural modifications, utility extensions, and interior finishing. This process unlocks significant property value and provides a versatile living space without expanding your home's footprint.

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ADU Permitting

ADU Permitting

ADU permitting involves preparing and submitting all necessary architectural, structural, and site plans to the City of Beaverton for approval before construction can begin. This critical step ensures your accessory dwelling unit project complies with all local zoning ordinances and building codes, preventing costly delays and rework.

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ADU Design

ADU Design

ADU Design involves creating detailed architectural plans, structural drawings, and material specifications for your Accessory Dwelling Unit. This comprehensive planning ensures your ADU is code-compliant, functional, and optimized for its intended use before construction begins.

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ADU Engineering

ADU Engineering

ADU engineering involves the structural design and analysis of your accessory dwelling unit, ensuring it meets all building codes and safety standards. This critical step provides the detailed plans necessary for permitting and sound construction in Beaverton.

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ADU Financing

ADU Financing

ADU financing involves securing the necessary capital to design, permit, and construct your accessory dwelling unit, covering everything from initial plans to final inspections. This service helps Beaverton homeowners navigate loan options to make their ADU project financially viable and stress-free.

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ADU Construction Management

ADU Construction Management

ADU Construction Management involves overseeing every phase of your accessory dwelling unit build, from initial site preparation to final inspections and certificate of occupancy. We ensure your Beaverton ADU project stays on schedule, within budget, and meets all local regulatory requirements.

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Junior ADU (JADU)

Junior ADU (JADU)

A Junior ADU (JADU) is an accessory dwelling unit created within an existing single-family home, often converting an unused bedroom or attached garage into a compact living space. This provides a cost-effective way to add rental income or house family members without expanding the home's footprint.

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ADU Site Assessment

ADU Site Assessment

Our ADU Site Assessment service evaluates your Beaverton property's specific conditions for ADU feasibility, covering zoning, utilities, and site constraints. This detailed analysis provides a clear roadmap for your project, identifying potential challenges and opportunities early on.

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Beaverton's Local ADU Contractor Experts

Coastal ADU is proud to serve Beaverton, OR and the surrounding communities. Our reputation is built on honest work, clear communication, and results that hold up over time.

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Frequently Asked Questions

The typical timeline for building an ADU in Beaverton, from initial design to final occupancy, ranges from 8 to 14 months. This includes 2-4 months for design and permitting with the City of Beaverton, followed by 6-10 months for construction, depending on the ADU's size and complexity. Factors like specific site conditions, utility connection requirements, and the responsiveness of city departments can influence these durations. We work to streamline the permitting process by submitting complete, accurate plans from the outset.
Common challenges when building an ADU in Beaverton often involve navigating specific zoning and permitting requirements, particularly regarding lot coverage, setbacks, and utility connections. For instance, properties in older neighborhoods might have smaller lot sizes or existing infrastructure that requires creative solutions for sewer and water hookups. Additionally, managing stormwater runoff in Beaverton's climate is crucial, which means proper grading and drainage plans are essential to prevent issues. We address these by conducting detailed site assessments and collaborating closely with city planners.
For an ADU in Beaverton's climate, a poured concrete slab-on-grade foundation with proper perimeter insulation is often a robust and energy-efficient choice. This type of foundation minimizes thermal bridging and provides a stable base, which is important given the region's varying soil conditions and wet winters. Alternatively, a crawl space foundation can be beneficial on sloped lots or where access to plumbing and electrical systems under the floor is desired, but it requires careful moisture barrier installation to prevent humidity issues. We assess your specific site's soil reports and drainage to recommend the optimal foundation system.
ADU utility connections in Beaverton typically involve tying into the existing main house's water, sewer, and electrical services, or establishing separate connections if feasible and desired. For sewer, a common approach is to extend a new line from the main house's cleanout, or in some cases, a new side sewer connection to the public main might be required by the City of Beaverton, depending on capacity and distance. Electrical service often requires a sub-panel fed from the main house's panel, ensuring adequate power without overloading the existing system. We coordinate with local utility providers and city inspectors to ensure all connections meet code.
ADUs in Beaverton must comply with the Oregon Residential Specialty Code (ORSC) for energy efficiency, which means stringent requirements for insulation, windows, and HVAC systems. This often includes R-values like R-21 for walls, R-49 for attics, and high-performance windows with U-factors around 0.30 or lower to minimize heat loss. We typically install ductless mini-split heat pumps for heating and cooling, because they offer excellent efficiency and zoned control, significantly reducing energy consumption. These measures ensure your ADU is comfortable year-round and keeps utility costs low.

Proudly Serving Beaverton and the Surrounding Area

From Beaverton to the surrounding communities, we bring the same level of care and craftsmanship to every job — whether it's a quick repair or a full project.

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Connect with us today for a detailed site consultation and a clear project roadmap.

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