Portland, Oregon pioneered the modern ADU movement and remains one of America's most ADU-friendly cities. Since the city relaxed ADU regulations in 2010, thousands of accessory dwelling units have been built, creating a mature market with experienced builders and streamlined permitting.
Top ADU Builders in Portland
Shelter Solutions
- Years in business: 28+ years (since 1997)
- ADUs built: 250+ in Portland Metro
- Rating: 4.9/5 on Google
- Price range: $175,000-$350,000
Shelter Solutions is Portland's most experienced ADU builder with over 250 completed ADUs. Their deep experience means they can anticipate challenges, navigate permits efficiently, and deliver consistent quality.
SQFT Studios
- Founded: 2015 by Architect Eli Green
- Specialty: Design-build ADUs
- Rating: 4.8/5 on Google
- Price range: $200,000-$400,000
SQFT Studios has emerged as a leader in Portland ADU design and construction, combining architectural design excellence with hands-on construction management.
My ADU Homes
- Specialty: Affordable, thoughtfully designed ADUs
- Rating: 4.7/5 on Google
- Price range: $150,000-$300,000
My ADU Homes is dedicated to building ADUs at an affordable price, making them accessible to more Portland homeowners.
Portland ADU Design & Build
- Specialty: Greater Portland and Willamette Valley
- Rating: 4.7/5 on Google
- Price range: $175,000-$325,000
A licensed and bonded team specializing in the greater Portland area with comprehensive design-build services.
Relevant Buildings
- Specialty: ADUs throughout Oregon and Washington
- Rating: 4.6/5 on Google
- Price range: $180,000-$350,000
Relevant Buildings serves the broader Pacific Northwest market, bringing cross-state experience to Portland projects.
The Powell Group
- Years in business: 20+ years
- Specialty: Custom homes and ADUs
- Rating: 4.8/5 on Google
- Price range: $200,000-$375,000
A hands-on homebuilding company with over two decades of experience in the Portland market.
Neil Kelly
- Specialty: Full-service design-build (ADUs, remodeling)
- Rating: 4.7/5 on Google
- Price range: $225,000-$400,000+
One of Portland's most established home improvement firms, Neil Kelly brings institutional resources and quality standards to ADU construction.
Portland ADU Cost Guide 2026
| ADU Type | Average Cost | Per Sq Ft |
|---|---|---|
| Garage conversion | $100,000-$200,000 | $175-$300 |
| Attached ADU | $150,000-$275,000 | $200-$350 |
| Detached new build | $200,000-$375,000 | $250-$400 |
| Prefab (installed) | $150,000-$300,000 | $225-$375 |
Portland costs are lower than California but higher than the national average. For broader comparison, see our ADU cost by state guide.
Portland-Specific Cost Advantages
- SDC waivers: Portland waives System Development Charges for ADUs under 750 sq ft, saving $15,000-$20,000
- Permit fee reductions: Expedited ADU permits available at reduced cost
- No parking requirement: ADUs do not require off-street parking in Portland
- No owner-occupancy requirement: Removed in 2020, allowing investment properties
Portland ADU Rules 2026
- Size limit: Up to 75% of primary dwelling or 800 sq ft, whichever is less
- Lot coverage: ADU + primary dwelling cannot exceed maximum lot coverage
- Height: Up to 20 feet for detached ADUs
- Setbacks: 5 feet from side and rear property lines
- Parking: None required
- Design standards: Must complement the existing home's character
For comparison with other states, see our ADU regulations guide.
Frequently Asked Questions
How long does it take to build an ADU in Portland?
Typical timelines range from 6-12 months for new construction and 3-6 months for conversions. Portland's Bureau of Development Services processes ADU permits in 4-8 weeks. Pre-approved plan sets can reduce this to 2-3 weeks.
Do I need to live on the property to rent out an ADU in Portland?
No. Portland removed the owner-occupancy requirement in 2020. You can own a property with an ADU and rent both units.
What is the rental income potential for a Portland ADU?
A 1-bedroom ADU in Portland rents for $1,200-$2,500/month depending on neighborhood, size, and finishes. Studios rent for $1,000-$1,800/month. The ADU income potential guide covers rental strategies in detail.
Can I use my Portland ADU as a short-term rental?
Portland allows short-term rentals in ADUs with restrictions. The property owner must live on-site (in either the primary dwelling or ADU), and you need a short-term rental permit from the city.
What is the ROI of a Portland ADU?
With construction costs of $175,000-$350,000 and rental income of $1,200-$2,500/month, the break-even period is typically 8-15 years on rental income alone. Combined with 20-35% property value increase, the total ROI makes ADUs one of the strongest home investments in Portland.
-- The ADU Finder Team