Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
In San Diego, an ADU contractor understands the specific coastal commission rules, fire safety codes, and local density incentives that apply to your property. Because regulations here are quite specific, you need a contractor who is experienced with local planning departments to avoid delays. Whether you are adding a unit in a hilly area or a flat lot, a local pro helps ensure your project stays compliant with all regional requirements from day one.
Frequently asked in Portland
What's the process for an ADU quote in Portland?
Are modular accessory dwelling units a good fit for Portland?
Modular accessory dwelling units can be a good fit for Portland, offering potential advantages in construction speed. These units are constructed off-site and then assembled on your property. It's essential that any modular ADU meets Portland's specific building codes and zoning requirements. A professional assessment will ensure the chosen module is suitable for your location.
What are the best ADUs for Portland properties?
The best ADUs for Portland properties depend on your individual needs and lot characteristics. Consider factors like budget, desired size, and how you plan to use the space – for family or rental income. Detached units can offer more privacy, while attached units might be more cost-effective. Consulting with local professionals can help determine the optimal ADU design for your Portland home.
What's the permit cost for an accessory dwelling unit in Portland?
The permit cost for an accessory dwelling unit in Portland is determined by the city's planning and building departments. These fees cover the review of your design plans and the inspections conducted during construction. The exact amounts can vary based on the scope of your project. When you receive a quote from the professionals we arrange, they can provide an estimate for these permit expenses.
What does 'accessory dwelling unit' mean for Portland homeowners?
For Portland homeowners, an 'accessory dwelling unit' (ADU) signifies adding a secondary, independent living space to their property. This can accommodate family members, generate rental income, or provide flexible living options. ADUs are a way to increase housing density within existing neighborhoods. They are a practical solution for many Portland residents.
What are accessory dwelling unit homes in Portland?
Accessory dwelling unit homes in Portland are properties that feature an additional, self-contained living unit alongside the main residence. This can be a detached structure in the backyard or an attached unit like a basement apartment. These units provide extra space for family or potential rental income. They must comply with Portland's specific zoning and building regulations.
What ADU services are available in Portland?
Also serving nearby: Vancouver · Beaverton · Gresham · Hillsboro · Salem
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Portland — population 630,498; about 4,723 residents per square mile across 133.5 sq mi. ZIP codes covered include 97201, 97202, 97203, 97204, 97205, 97206, 97207, 97208.
Neighborhoods served in Portland: Pearl District, Hawthorne District, Alberta Arts District, Sellwood-Moreland, Laurelhurst, Downtown Portland — and every surrounding area.
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