Skip to main content Skip to content Cedar Hills ranch lots from the original 1946 master plan are ideal for detached ADUs and garage conversions. Woodland Construction Group designs and builds ADUs in Cedar Hills under Washington County permits – one accountable team from first sketch to county final inspection.
Thinking about building an ADU in Cedar Hills? The neighborhood’s generous, level lots – laid out in the original 1946 master plan as one of the most ambitious suburban housing developments in the Northwest – are well-suited for accessory dwelling units. Many homes have deep backyards and existing detached garages that convert efficiently into fully independent living spaces.
Cedar Hills sits in unincorporated Washington County, which means ADU projects follow Washington County development code and Oregon statewide ADU rules, not the City of Portland ADU program. Setbacks, size limits, utility connections, and parking are reviewed by Washington County. Woodland Construction Group manages every step of that process.
Review Washington County ADU permitting requirements before you begin.Whether the goal is rental income, a space for aging parents, a private suite for an adult child, or increased resale value, an ADU adds real flexibility that a home renovation alone cannot provide. In 2026, Cedar Hills homeowners are building ADUs in greater numbers – and the level lots, proximity to Sunset Transit Center, and strong rental demand near St. Vincent and Beaverton employers make the case compelling.
A detached ADU in Cedar Hills typically runs $150,000 to $400,000+ depending on size, site conditions, utility connections, and finish level. A garage conversion generally lands between $120,000 and $200,000 because the existing foundation and exterior walls reduce construction scope.
Cedar Hills ADUs near Sunset Transit Center and Beaverton School District campuses attract strong rental interest. Monthly rental income of $1,500 to $2,500+ is typical for a well-built one-bedroom unit in the area, which can offset a significant portion of construction costs over time. ADUs also add appraised value to the property and serve as a flexible asset for multigenerational living arrangements.
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An ADU on a Cedar Hills lot adds income-producing square footage without requiring a move. The neighborhood’s position between US-26 and OR-217, close to the Sunset Transit Center and Beaverton’s employment corridor, means consistent rental demand from commuters, healthcare workers at nearby St. Vincent Medical Center, and families connected to Beaverton School District.
A well-built detached ADU or garage conversion also gives homeowners a private, code-compliant space for multigenerational living – whether that means bringing an aging parent closer or giving an adult child a place to land while staying within the family property. That flexibility has real value independent of rental income.
From a financial standpoint, ADUs increase the appraised value of the property and generate a return through rental income that a standard remodel cannot replicate. See how an ADU fits a broader home project on our ADU builder service page.
Woodland Construction Group – 18 Years Experience – Cedar Hills, Oregon
Our team of licensed contractors specializes in ADU design and construction across Cedar Hills and the broader Washington County metro. We manage Washington County zoning review, permits, utility coordination, and all county inspections – so homeowners have a single point of contact from design through move-in.
Cedar Hills ADU rental income of $1,500 to $2,500 per month can offset construction costs over time while adding a permanent income-producing asset to your property – and a private residence for family when you need it most.
Six ADU types and capabilities appear most often in the Cedar Hills projects we build in 2026. Each one is designed for the way Cedar Hills homeowners actually plan to use the space.
Fully independent structures built on their own foundation in the backyard or side yard – complete with kitchen, bath, living area, and private entrance. Cedar Hills lots often have the depth and utility access to support them.
Repurposing an existing detached garage into a livable ADU, using the foundation and exterior walls to reduce cost and construction time. A practical path for Cedar Hills homes with older detached garages.
A connected addition to the main house with its own separate entrance, kitchen, and bath. Shares a wall with the primary residence while remaining fully self-contained for rental or family use.
ADUs designed from the start for long-term tenants – durable finishes, efficient layouts, and utility metering arranged for independent occupancy. Built to attract renters near Sunset Transit and Beaverton employers.
Private, accessible, single-level ADU suites designed for aging parents or adult children – close to the main house but fully independent. Cedar Hills’ flat lots and ranch-home character make single-level builds straightforward.
Full design-build service including Washington County zoning review, permit applications, utility coordination, and all county inspections. One team, one contract, from first sketch to final county approval.
How We Work
One team, one contract, from the first measurement to the final walkthrough, with no handoffs between designer, builder, and trades: design and 3D layouts, material selection, permitting and inspections, careful demolition, licensed construction, and a final walkthrough, all backed by our 1-year craftsmanship warranty.
See our full design-build processA look at the detached ADUs and accessory structures we have delivered across Cedar Hills and the Portland metro.
Walk through every line that shapes the number – from foundation and framing to utility connections and county permit fees – with a calculator built on real Portland metro ADU project data.
Engaging with Woodland for our home extension was a great decision. They were attentive to our vision, offered valuable insights, and completed the project on time. Their commitment to quality and craftsmanship is truly impressive.
A huge thank you to Woodland Construction Group for the beautiful job they did on our home extension. High-quality craftsmanship throughout.
Woodland Construction Group is an expert in their field. We are very satisfied with their work.
Timelines, 2026 costs, Washington County permits, rental income, and what to expect. If your question is not here, call us – we would rather answer it directly.
A detached ADU in Cedar Hills typically takes 6 to 12 months from initial design through final inspection. The timeline includes Washington County zoning review and permit approval (which can take 2 to 4 months depending on scope), site prep, foundation, framing, mechanical rough-in, and finish work. Garage conversions generally move faster, often 4 to 6 months, because the foundation and shell are already in place. We set a detailed schedule at the start and manage every step through county final approval.
In Cedar Hills and the broader Washington County market in 2026, a detached ADU typically runs $150,000 to $400,000 or more depending on size, finishes, and site conditions. Garage conversions generally land between $120,000 and $200,000 because the foundation and exterior shell are already in place. Attached ADUs fall between those ranges. Factors that move the number include square footage, utility connections, sewer or septic requirements, and finish level. You receive a detailed itemized estimate during the consultation phase.
Cedar Hills is unincorporated Washington County, not the City of Portland, so ADUs there follow Washington County development code and Oregon statewide ADU regulations – not the City of Portland ADU program. Washington County reviews setbacks, maximum size, height limits, utility connections, and parking requirements for your specific parcel. Oregon law has made ADUs broadly permitted on residential lots statewide, which has streamlined approvals, but county review still applies. Woodland Construction Group manages the full Washington County zoning and permit process for Cedar Hills ADU projects.
Yes. Cedar Hills ADUs built under Washington County permits can be rented as long-term residential units, which is one of the primary reasons homeowners build them. Oregon state law has removed owner-occupancy requirements for ADU rentals in most jurisdictions, meaning you do not have to live on the property to rent the ADU. Proximity to the Sunset Transit Center, New Seasons at Cedar Hills Crossing, and Beaverton School District campuses makes Cedar Hills ADUs attractive to renters. Rental rates in the area can offset a significant portion of construction costs over time.
A detached ADU is a fully independent structure built on its own foundation in the backyard or side yard, separate from the main house. It typically includes a full kitchen, bath, living area, and its own entrance. A garage conversion repurposes an existing detached garage into living space, using the existing foundation and exterior walls to reduce cost and construction time. Cedar Hills neighborhoods have many detached garages on generous lots from the original 1946-1970s master plan, making garage conversions a practical and cost-effective path. Both types require Washington County permits and must meet current building codes.
For most Cedar Hills homeowners, yes. An ADU adds usable square footage, creates a rental income stream that can offset the construction cost over time, and increases property value. Cedar Hills’ location near Sunset Transit Center, St. Vincent Medical Center, and Beaverton employers means strong rental demand from working households. ADUs also provide a private, separate space for aging parents, adult children, or caregivers – which is why multigenerational living is one of the top reasons Cedar Hills homeowners build them in 2026. The design-build approach WCG uses keeps the project on a single contract from design through county approval and construction.
Family-owned and based in Northwest Portland, we build ADUs across Cedar Hills, Beaverton, and the broader Portland west-side suburbs – all under Washington County or City of Portland permits depending on jurisdiction.
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Book a free site visit and consultation. We will walk your lot, review Washington County ADU rules for your parcel, discuss detached vs. garage conversion options, and give you an honest estimate – with no pressure and no handoffs.
