Trusted ADU Builders in Oregon
Independent Living Separate from Your Primary Home for In-Laws, Adult Children, Guests, and More
Why Build an ADU in Oregon?
An ADU (Accessory Dwelling Unit) is a smaller, independent residential space built on the same lot as a primary home. Also known as granny flats, in-law units, or backyard cottages, ADUs offer advantages in multiple ways.
Benefits of Building an ADU
- Passive Income: Rent out your ADU to generate steady monthly income.
- Housing Flexibility: Ideal for adult children, aging parents, or guests—while keeping loved ones close but independent.
- Multigenerational Living: Create space for extended family while preserving privacy and independence.
- Remote Work: Turn your ADU into a quiet, dedicated home office or creative studio.
- Equity Growth: ADUs add value to your property, helping you build long-term equity.
The Time to Build Your ADU is Today
With rising housing demand and a statewide push to remove barriers, now is an ideal time to build a custom ADU. HiLine Homes is here to make the process simple, streamlined, and affordable, whether you want an ADU for added space or extra income.
Our ADU Building Services
With nearly 30 years of experience, HiLine Homes has developed a trusted and streamlined process for building affordable, high-quality homes, including ADUs. Our comprehensive Design + Build services support you through every phase of your ADU project, from the first design consultation and financing guidance to the final touches of construction.
Whether you’re creating extra space for family, a home office, or rental income, we’re here to help you build an ADU that fits your vision and enhances your home’s value.
Attached vs. Detached ADU Plans
At HiLine Homes, we recognize that no two families have the exact needs. Flexibility is crucial when planning your custom home. That’s why we offer ADU plans that can be either attached to your new HiLineHome or built as a separate structure on your property.
Whether you choose an attached or detached option, each ADU plan is thoughtfully designed to support independent living, featuring soundproofing, private entrances, and comfortable layouts—all while staying aligned with your overall home design.
Timeline and Permitting Support
The property’s location, site access, and design complexity all impact the build schedule of your ADU. That’s why our team walks you through the process with dedicated support for permitting and personalized project timelines.
Our extensive experience across Oregon, Washington, Northern California, and Idaho makes us well-versed in regional requirements and ready to help you navigate them with ease.
On Your Lot, On Time, Built Right!
At HiLine Homes, your vision matters—and we’re here to make sure it’s realized with confidence, clarity, and care.
Download Our Accessory Dwelling Unit Guide!
Where ADUs Work Best in Oregon
Urban Areas: Portland, Eugene & Beyond
In growing urban areas like Portland and Eugene, ADUs are an ideal solution for maximizing limited residential space for multigenerational living, home office, guest suite, and more.
University Towns: Corvallis, Ashland, and More
ADUs are smart investments for long- and short-term rental units in vibrant college towns like Corvallis and Ashland, where homeowners can earn passive income.
Rural & Agricultural Areas: Guest Homes on Family Farms
For Oregon’s rural and agricultural zones, ADUs make ideal guest houses, caregiver quarters, or seasonal housing. A detached custom ADU provides an independent living space that promotes quiet and privacy.
ADU Floor Plans and Programs
Under Oregon Senate Bill 1051, cities with populations over 2,500 and counties with more than 15,000 residents—within urban growth boundaries—are required to allow at least one Accessory Dwelling Unit (ADU) for every detached single-family home. This legislation supports the expansion of Oregon’s housing stock by encouraging more flexible and affordable living options for families, homeowners, and communities across the state.
Whether you need a compact rental unit or a cozy suite, we offer ADU models that cater to your specific needs—each plan designed with efficiency, quality construction, and residential comfort in mind.
Home Plan 800
Home Plan 800 features a spacious living room, a primary suite, and a walk-in closet. Not only do you acquire a spacious dining area in this 800 sq. ft. plan, but you also get a laundry room with plenty of storage space.
Home Plan 500A
Home Plan 500A is a 500-square-foot stand-alone ADU that features a spacious Great Room and kitchen, enhanced by a vaulted ceiling that adds an open, airy feel. A covered front porch extends the living space outdoors—ideal for relaxing or greeting visitors.
Home Plan 500B
Plan 500B is one of our most versatile and space-smart ADU options. Specifically designed to be attached to another HiLine Home, it offers everything you need in a thoughtfully designed footprint. This cozy layout features a private bedroom and an open Great Room, both enhanced with vaulted ceilings to create a light and airy feel.
ADU Costs and Financing
Building an ADU is an investment with potential returns from rent and increased home value. Here is how we help you navigate the costs and financing of ADU building.
Reliable Cost Quotes
With upfront home pricing and expert guidance, we help you understand the full investment required to build on your property. By reviewing site conditions, helping you navigate permits, and project requirements upfront, we help you understand what to expect before you move forward.
Understanding Regional Permitting Fees
Building permits for ADUs vary by city and county. On average, the permit costs range between $6,000 and $10,000. At HiLine Homes, we help you navigate these permits, from zoning approval and utility connection to site assessments with confidence.
Financing Options to Fit Your Budget
Our trusted network of Approved Lenders offers exclusive terms and options, including up to 100% Financing programs. Not only do we provide a simplified home construction loan application process, but our Home Consultants will also guide you through the loan documentation and appraisal preparation.
Start Your ADU Project Today
ADUs can bring you diverse benefits from rental income to adding living space for guests and loved ones. Through HiLine Homes, we make your ADU construction experience smooth, streamlined, and stress-free by guiding you every step of the way—from design and financing to construction completion.