ADU Design and Construction in Portland, OR
Accessory Dwelling Units (ADUs) are an increasingly practical way for homeowners to make better use of their existing property. Whether the goal is to accommodate multi-generational living, create a dedicated workspace, or generate rental income, an ADU can offer real, lasting value. EcoCraft LLC designs and builds custom ADUs for homeowners throughout the Portland metropolitan area, serving communities including Beaverton, Lake Oswego, Tigard, Milwaukie, Gresham, and Vancouver, WA.
EcoCraft LLC was recognized by Portland Architects in their article, Best ADU Builders in Vancouver, WA (2024), reflecting their standing as an established ADU contractor in the region.
Building an accessory dwelling unit — whether it's a detached ADU, a garage conversion, a basement transformation, or an in-law suite — involves more than just construction. These projects require careful planning, thoughtful design, and navigation of local permitting requirements. EcoCraft LLC brings the experience and knowledge needed to guide homeowners through each stage of the process, from initial design to final build.
What Is an ADU?
An ADU is a separate living unit built on a property that already contains a single-family home. There are two main types:
- Attached ADUs — additions connected to the primary residence, such as a basement apartment or an addition built onto the home
- Detached ADUs — standalone structures separate from the main house, sometimes referred to as backyard cottages, granny flats, or casitas
ADUs can also take the form of a garage conversion, an apartment above a garage, or a newly constructed backyard cottage. Each type has its own set of design considerations, cost factors, and permitting requirements.
Beyond providing extra living space, ADUs can serve a variety of purposes — a home office, a fitness area, a creative studio, or a comfortable space for aging parents or adult children. As a granny flat builder and in-law suite builder serving the Portland area, EcoCraft LLC works with homeowners to design ADUs that fit their specific needs and property conditions.
From a financial standpoint, ADUs can increase property values and make homes more attractive to buyers, particularly those interested in aging-in-place options. They can also serve as a source of short- or long-term rental income, contributing to the local housing supply in areas experiencing shortages.
Permitting, Pricing, and Property Suitability
In Portland, ADUs must comply with specific setback rules, height restrictions, and design compatibility guidelines relative to the primary residence. The permitting process typically takes between 6 and 12 weeks, depending on the scope of the project. EcoCraft LLC handles the preparation and submission of necessary documents, helping to keep the process moving efficiently.
In terms of cost, ADU projects in the Portland area generally range from $150,000 to $350,000. A garage conversion contractor or basement conversion tends to cost less due to existing infrastructure, while new detached ADU construction may involve higher site preparation expenses. EcoCraft LLC also helps clients identify potential cost-saving opportunities throughout the project.
Every property is different, and not every lot is immediately suited for every type of ADU. EcoCraft LLC offers property assessments that examine zoning requirements, lot dimensions, utility access, and other factors that affect feasibility. This helps homeowners make informed decisions before committing to a specific approach — whether that's a JADU contractor-style junior ADU, a full detached ADU builder project, or a simpler garage conversion.
ADUs have grown in popularity across the Pacific Northwest, partly driven by the rise of remote work and the ongoing demand for flexible living arrangements. Cities in the region, including Portland, have worked to simplify and reduce the cost of ADU permitting in response to housing shortages. While the process remains detailed, EcoCraft LLC is familiar with local regulations and manages the permitting details on behalf of their clients.
