Skip to main content Skip to content Detached accessory dwelling units, garage conversions, and multigenerational suites, built to Tigard and Oregon code. Woodland Construction Group designs and builds ADUs across Tigard, from Bull Mountain’s larger lots inward, with one accountable team from first sketch to final walkthrough.
Review the City of Tigard ADU permitting requirements before you begin.Planning an ADU in Tigard, Oregon? An accessory dwelling unit is a second, smaller home on your lot, detached in the yard, converted from a garage, or built into the house. Tigard families use them for rental income, aging parents, adult kids, or a private home office, all without buying a second property.
Oregon law is now firmly on your side. Every single-family lot inside the urban growth boundary is allowed at least one ADU, and there is no requirement that you live on-site to rent it. That makes a Tigard ADU one of the most flexible investments you can make in your property.
The work spans foundation, framing, full systems, and code, plus Tigard’s specific size and height limits. The right partner handles design, permits, and construction as one project. That is what we do, on every Tigard ADU.
A detached ADU in Tigard typically runs $300 to $500 per square foot, with total project investments landing between $120,000 and $350,000+ depending on size, finishes, and site work. Tigard allows detached ADUs up to 800 square feet.
With Oregon guaranteeing ADU rights and no owner-occupancy requirement, a well-built ADU can generate long-term rental income, house family affordably, and add lasting value to your Tigard property.
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An ADU does double duty: it adds a flexible living space now and an income or resale asset later. In Tigard, where Oregon law guarantees the right to build one and does not require you to live on-site, that flexibility is rare and valuable.
Use it as you need. Rent it for long-term income, house aging parents close but independent, give an adult child a private start, or run a quiet home office. Because the unit is self-contained, it adapts as your family changes without another move.
Done right, with permits, systems, and code handled as one project, an ADU pays you back for decades. On Bull Mountain’s larger lots there is often room for a full detached unit. Compare it with our Tigard home additions options.
Woodland Construction Group – 18 Years Experience – Serving Tigard, Oregon
Our licensed team designs and builds ADUs across Tigard and Washington County, handling Tigard’s 800-square-foot detached limit, height rules, and the city-versus-county permitting split so your unit is legal, livable, and built to last.
Oregon now guarantees at least one ADU on every single-family lot inside the urban growth boundary, with no requirement to live on-site, making a Tigard ADU a uniquely flexible income and family asset.
Tigard is well-suited to ADUs. Bull Mountain’s larger custom-home parcels often have the yard for a full detached unit, while garage conversions and interior ADUs work across the city’s 1970s and 1980s subdivisions. Demand is rising for both rental income and keeping family close.
Tigard’s rules are specific. A detached ADU can be up to 800 square feet and 25 feet tall, with one detached ADU allowed per lot. Statewide, Oregon’s HB 2001 and SB 1051 guarantee at least one ADU on every single-family lot in the urban growth boundary, and cities cannot require you to live on-site to rent it. We design to those limits from the first sketch.
One local detail matters before anything is built: permits. Inside the city limits, your ADU is permitted through the City of Tigard, with a typical path of roughly three to four months to permit issuance. Many Bull Mountain addresses are unincorporated and run through Washington County instead. System development charges may apply, and we confirm jurisdiction and fees for your address up front.
Six ADU paths cover almost everything we build in Tigard. Each one is designed to Tigard’s size and height limits and Oregon’s ADU law from the first sketch.
Stand-alone units up to Tigard’s 800-square-foot limit, with a full kitchen, bath, and living space, sited to meet setback and height rules.
Turning an existing garage into a legal, conditioned dwelling, a cost-effective path to an ADU on tighter Tigard lots.
Self-contained units carved from a daylight basement or the home’s footprint, with a separate entrance and full systems.
Private, accessible units for aging parents or adult children, close to family but fully independent.
Long-term rental ADUs built to code and designed to attract quality tenants, with no Oregon owner-occupancy requirement.
City of Tigard or Washington County permits, size and height compliance, and system development charges handled end to end.
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 units, conversions, and suites we build for rental income and family across Tigard.
Walk through every line that shapes the number, from foundation and utilities to systems, finishes, and permitting, with a calculator built on real Portland-metro 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.
Size limits, owner-occupancy, permits, cost, and what to expect in 2026. If your question is not here, call us. We would rather answer it directly.
In Tigard, a detached ADU can be up to 800 square feet and 25 feet tall, with one detached ADU allowed per lot. An ADU built within or attached to the main home cannot exceed the size of the primary unit. We design to these limits from the first sketch so the project is approvable.
No. Under Oregon law (HB 2001 and SB 1051), cities cannot require owner-occupancy as a condition of renting a standard long-term ADU. You can live in the main house and rent the ADU, live in the ADU and rent the house, or rent both, which makes a Tigard ADU a flexible income asset.
A detached ADU in Tigard typically runs $300 to $500 per square foot, or roughly $120,000 to $350,000+ total depending on size, finishes, and site work. Garage and interior conversions can cost less. System development charges may apply. You get an itemized estimate during the consultation phase.
Plan on roughly 3 to 4 months to permit issuance, then several more months for construction depending on size and type. A garage conversion is faster than a new detached unit. We manage design, permitting, and construction as one timeline and keep you updated at every stage.
Yes. An ADU requires a building permit plus mechanical, plumbing, and electrical permits. Inside the city limits, permits come from the City of Tigard. Many Bull Mountain addresses are unincorporated and run through Washington County Building Services. We confirm the jurisdiction and handle every application, plan review, and inspection.
Yes, for most owners. With Oregon guaranteeing ADU rights and no owner-occupancy requirement, an ADU can generate long-term rental income, house family affordably, and add lasting value to your property. On Bull Mountain’s larger lots especially, a detached ADU is one of the highest-use additions you can build.
Family-owned and based in Northwest Portland, we build ADUs across every Tigard neighborhood and the nearby west-side communities.
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Book a free in-home consultation. We will assess the space, talk through layout and budget, and give you an itemized estimate, with no pressure and no handoffs.
