Coastal ADU provides expert Accessory Dwelling Unit construction services for homeowners across Portland, Oregon. From initial design consultation to final occupancy, we manage every phase of your ADU project, bringing our detailed construction methodology from Beaverton directly to your Portland property. We understand the unique zoning requirements and architectural styles prevalent in neighborhoods like Laurelhurst and Sellwood, which allows us to integrate your new ADU seamlessly. Our focus is on delivering durable, high-performance ADUs that enhance your property value and functionality.
Get a Free Quote in PortlandAttached 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.
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.
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.
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.
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.
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.
Choosing Coastal ADU for your Portland ADU means partnering with a builder who understands the local context. We're not just another contractor; we're familiar with the specific permitting processes of the City of Portland Bureau of Development Services and the design review considerations for areas with historic overlays. This local knowledge helps us navigate the complexities of your project efficiently, reducing unexpected delays and ensuring compliance from the outset. Our proximity means we're regularly in Portland, allowing for frequent site visits and direct oversight, which is essential for maintaining project integrity.
Our construction approach prioritizes long-term performance and energy efficiency. For example, we often specify advanced framing techniques and use high-performance insulation like closed-cell spray foam or rigid exterior insulation, which significantly reduces thermal bridging. We detail our building envelopes meticulously, employing continuous air barriers and flashing systems that meet or exceed Oregon residential energy code requirements. This attention to detail in the structure's foundation and shell means your ADU will be comfortable, quiet, and economical to operate for decades.
When you work with Coastal ADU, expect a structured and communicative process. We begin with a thorough site assessment, considering factors like utility access, grade changes, and existing tree canopies. Our proposals are detailed, outlining material specifications, construction phases, and a realistic timeline. We use project management software to keep you informed of progress and milestones, and our on-site supervisors ensure that trade coordination is precise. This systematic approach means you always know what's happening and that your ADU is being built to the highest standards.
Portland homeowners can generally build an ADU up to 75% of the primary dwelling's footprint or 800 square feet, whichever is smaller, provided it meets other zoning setbacks and height limits. For instance, if your main house is 1,200 square feet, your ADU could be up to 800 square feet. This size constraint helps maintain neighborhood character and manage density, which is a key consideration for the City of Portland's planning department. We always verify the specific allowable dimensions for your property based on its zone and lot size during the initial design phase. Understanding these limits early prevents costly redesigns later in the project.
The permitting process for an ADU in Portland typically takes between 4 to 8 months from initial application submission to permit issuance, depending on project complexity and current city review queues. This includes time for plan review by the Bureau of Development Services for zoning, structural, and energy code compliance. Projects requiring adjustments for historic districts or environmental overlays may experience longer review periods, which means careful pre-application planning is crucial. We manage all permit submissions and respond to city comments promptly, aiming to keep your project moving forward efficiently.
The average cost to build an ADU in Portland typically ranges from $200,000 to $400,000, varying significantly based on size, finishes, site conditions, and utility connections. A smaller, simpler detached ADU with standard finishes might be at the lower end, while a larger, custom-designed unit with high-end materials or complex site work (like extensive excavation for a basement ADU) will be at the higher end. Utility hookups, such as extending sewer and water lines, can add substantial costs, which is why we conduct a detailed site analysis to provide a precise estimate. Our proposals itemize these costs clearly, ensuring you understand where your investment is going.
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