rv-park
Roamer's Rest RV Park
Tualatin, OR (~10 mi SE of Hillsboro)
Year-round Washington County RV park with electric and water hookups, located near Wine Country, Intel, and Nike WHQ; supports long-term stays.
Friendly · Why this rating →
Tiny Homes in Hillsboro, Oregon
Hillsboro tiny home zoning, ADU rules, THOW parking, and builder costs for Washington County, Oregon.
Last researched June 2026
$85,000 – $170,000
Builder cost range
6
Builders serving area
106,894
Population
Friendly
Tiny-home friendliness
Why Hillsboro
Hillsboro anchors Oregon's Silicon Forest with strong tech employment, higher median incomes, and good MAX light rail connectivity to Portland. The Pacific Northwest climate means wet winters; builders here often focus on foundation-based ADUs and cottage clusters more than THOWs. Washington County's rural edges offer additional options. Orenco Station's compact, transit-oriented blocks show the small-footprint ethos at neighborhood scale, the Jackson Bottom Wetlands Preserve keeps herons and trail miles ten minutes from the tech campuses, and the downtown Hillsboro farmers market anchors dry, mild summer weekends.
Zoning & Placement
State zoning:FriendlyADU rules:Documented below
Hillsboro follows Oregon's statewide ADU baseline under ORS 197A.425 and implements HB 2001 middle-housing rules through the Hillsboro Community Development Code. ADUs have been allowed on single-family lots since the 1990s: they are defined in Community Development Code Section 12.01.500, with approval standards in Section 12.80.170. Detached units may reach 800 square feet (or 1,000 square feet on lots over 8,000 square feet), attached units are capped at 50% of the primary dwelling's living area or 800 square feet, and a 2020 code amendment removed off-street parking requirements and eased architectural standards, as of June 2026. THOW placement as a primary dwelling is not explicitly legalized; RV-classified tiny homes must be accessory to a permanent home. Verify current requirements with your local planning department before purchasing land or beginning construction.
Verify current requirements with your local planning department.
What to verify locally
- • Confirm whether your tiny home will be treated as an ADU, a site-built dwelling, or a recreational vehicle.
- • Ask about utility hookup requirements, especially sewer, electrical service, and emergency-access setbacks.
- • Check whether long-term occupancy is allowed on the lot type you are considering.
- • Verify minimum square footage requirements for your zone classification.
ADU & Backyard Tiny Homes
ADUs are permitted statewide under ORS 197A.425, which Hillsboro implements. As of May 2026, detached and attached ADUs up to 800 sq ft are allowed on most single-family lots with no owner-occupancy and no additional off-street parking requirement for the baseline unit. Standard residential setbacks and the underlying zone's lot-coverage limits apply, and detached ADUs must meet building code separation and access standards. A building permit is required, and System Development Charges may apply for water, sewer, and parks; consult Hillsboro Planning before final design to confirm any zone-specific limits.
Where to Park
Communities, RV parks, and parking options in and near Hillsboro.
THOW parking rules:Documented belowCommunities listed:3
Hillsboro treats tiny houses on wheels as RVs. Placement on a residential lot requires a primary dwelling, proper utility hookups, and compliance with Hillsboro's parking and setback codes. The city has no Portland-style explicit occupied-RV allowance, so verify with Hillsboro Planning before placing. Most THOW owners in Washington County therefore look to RV parks with long-term spaces or to rural parcels outside the urban growth boundary. Oregon's SB 1013 (effective January 1, 2024) allows counties to permit one RV as a rental dwelling on rural residential land; Washington County's participation status was unconfirmed as of June 2026, so treat county placement as case-by-case and confirm with the county's land use division first.
rv-park
Hillsboro RV Village
Hillsboro, OR
RV park within Hillsboro offering nightly, weekly, and seasonal rates with a posted park map showing both RV and tent sites.
co-housing
Trillium Hollow Cohousing
9601 NW Leahy Rd, Portland 97229 (~10 mi east of Hillsboro)
28-unit multigenerational cohousing community on 4 wooded acres in the Cedar Mill area, the closest established cohousing community to Hillsboro.
Builders Serving Oregon
Seattle Tiny Homes
Buckley, Washington
Buckley-based builder and one of Washington's first to embrace L&I factory inspection. Builds ANSI 119.5 certified THOWs, park models, and modular tiny homes. CEO Todd McKellips also serves as executive director of the Washington Tiny House Association.
THOW Park models Modular homes
Service areas: Washington, Oregon, California
Tiny Heirloom
Portland, Oregon
Portland-based luxury tiny home builder featured on national television. Family-owned company offering fully custom THOWs, park models, ADUs, and commercial builds. Signature Series starts at $129,900. Builds designed for Oregon's climate with moisture resistance and thermal insulation.
Luxury custom THOW Park models ADU
Service areas: Oregon, Washington, California
Tru Form Tiny
Eugene, Oregon
Eugene-based luxury tiny home builder with over 300 handcrafted homes delivered. Family-owned company with PHIUS and LEED backgrounds emphasizing sustainable building practices. Offers both signature models and fully custom builds with financing starting at $697/month.
Luxury THOW Custom builds
Service areas: Oregon, Washington, California
Wolf Industries
Battle Ground, washington
Battle Ground factory builder producing modular tiny homes, ADUs, and single-family homes. Over 500 homes placed in five years. New 21,000 sq ft factory doubles production capacity to two homes per week.
Modular homes ADU focused Prefab / factory-built
Service areas: washington, oregon, california, montana, idaho
DC Structures
Damascus, Oregon
Oregon-based pre-engineered building kit manufacturer offering prefab cabin kits (including the 495 sq ft Mazama model) and backyard ADU kits shipped nationwide. Founded in 2002 alongside sister company DC Builders; maintains Delaware-specific design and pricing resources for cabin and ADU projects.
Prefab / modular ADU
Service areas: Delaware, Maryland, Virginia, Pennsylvania, New Jersey, New York, Oregon
Dweller
Portland, Oregon
Portland-based prefab ADU specialist offering turnkey modular accessory dwelling units with fixed pricing. Handles all aspects from site planning and permitting to utilities, installation, and landscaping. Rent-ready units delivered in under five months.
Prefab ADU Modular construction
Service areas: Oregon
Costs
A comparison between tiny-home living and conventional homeownership in Hillsboro.
Typical builder range:$85,000 – $170,000Builders serving area:12
Tiny home path
Builder cost range $85,000 – $170,000
Estimated monthly total
Traditional home path
Median home price
Estimated monthly total
Potential monthly savings
Common Questions
Can I live full-time in a THOW in Hillsboro?
Not as a standalone primary dwelling. THOWs are treated as RVs and must be accessory to a permanent residence on the lot.
Are ADUs allowed in Hillsboro?
Yes. Under ORS 197A.425 and Hillsboro's code, detached and attached ADUs up to 800 sq ft are permitted on most single-family lots.
Is Hillsboro more expensive than other Oregon cities?
Yes. Tech-driven demand pushes land and builder costs higher than Salem or Eugene, though still below central Portland.
What about rural Washington County?
Unincorporated Washington County often allows more flexibility for RV-classified tiny homes on larger acreage, subject to septic, setback, and access rules.
Guides for Oregon Buyers
Guides, zoning explainers, and financing articles related to this state.
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Tiny Home Zoning Laws by State (2026): Where Can You Actually Live?
A state-by-state breakdown of tiny home zoning laws, THOW regulations, ADU rules, and where tiny homes are easiest to place legally in 2026.
Tiny Home Zoning by State: What's Legal Where in 2025
A state-by-state overview of tiny home zoning laws, covering the most friendly and most restrictive states for THOW and foundation tiny home placement.