Modular Homes in Oregon: Costs, Builders, and State Rules (2026)

A modular home in Oregon runs from about $160,000 to $400,000 all in, depending on size, finish, and how much work the land needs. That figure is the whole project, factory cost plus foundation, delivery, utilities, and permits, not the sticker price a factory quotes for the boxes alone. The state average lands near $285,000, against roughly $456,000 for a comparable new site built house. The gap is real. So are the cost traps on rural land, and Oregon’s own building rules decide which of those numbers you actually pay.

At a glance

• Typical all in cost: $160,000 to $400,000 for a complete installed modular home, with the Oregon average near $285,000.
• Installed price per square foot: roughly $100 to $185 from volume builders, climbing past $300 for custom and modern designs.
• Build timeline: 4 to 6 months from order to move in under normal conditions.
• Where the builders are: Portland metro, the Willamette Valley, Central Oregon around Bend and Redmond, and Southern Oregon around Medford.
• ADUs: Oregon law lets a modular home serve as an accessory dwelling unit, and Portland waives system development charges to encourage them.
• Financing: a modular home on owned land qualifies for conventional, FHA, and VA loans on the same terms as a site built house.

Modular, manufactured, and prefab: what the words mean in Oregon

Three terms, three different things, and the difference decides how the home is taxed, financed, and permitted.

A modular home is built in sections at a factory, trucked to the site, and assembled on a permanent foundation. It meets the same state building code, the International Residential Code, as a house framed on the lot. Once it is set, Oregon treats it as real property. It appreciates, finances, and taxes like any other house.

A manufactured home is built to a federal standard, the HUD code, on a permanent steel chassis that stays with the home. Oregon law calls these manufactured dwellings, and the old phrase mobile home points back to when they were routinely moved. On leased land without a permanent foundation, a manufactured home is personal property and can depreciate like a vehicle. Anchor it to a foundation on land you own and it can be reclassified as real property for financing.

Prefab is the umbrella. It covers modular and manufactured homes, plus panelized kits and other off site construction. The word describes where the home is built, not the code it meets, so a quote that only says prefab has not told you the thing that matters.

If you want the full side by side, compare modular and manufactured homes before you shortlist a builder.

What a modular home costs in Oregon

A complete, installed modular home in Oregon typically lands between $160,000 and $400,000, and the average sits around $285,000. That average undercuts the roughly $456,000 a new site built house costs in the state and beats the $210,000 average for a manufactured home only because the manufactured figure usually excludes land and a permanent foundation. The number that matters is the all in cost, because the factory quote is only part of it.

Cost component	Typical Oregon range
Base factory cost per square foot	$50 to $100
Installed modular, factory plus site work	$80 to $185 per square foot
Site preparation	$4,000 to $11,000
Foundation	$6,000 to $30,000 and up
Permitting	$500 to $5,000
Utility hookup	$2,500 to $25,000
Typical total installed	$160,000 to $400,000

A useful rule of thumb is the 60/40 split: about 60 percent of the budget goes to the factory built home, and 40 percent covers land prep, foundation, delivery, utilities, local labor, and permitting. When a builder quotes only the factory price, work backward from it to get the real total.

Oregon adds its own pressures. Pacific Northwest construction labor runs above the national average. Rural and off grid parcels push utility hookups toward the top of the range. Coastal and flood zone sites carry extra engineering and permitting. System development charges vary by city, and Portland’s ADU fee waiver is the exception, not the norm. For broader pricing context across the country, see our modular home cost breakdowns.

Where to find modular home builders in Oregon

The active builders cluster in five regions, and the right one depends on where you are putting the home and how custom you want it.

Portland metro leans modern and ADU focused. Dweller builds modular accessory units from 392 to 660 square feet, turnkey including permits, at roughly $214 to $408 per square foot. ModsPDX designs custom modern modular homes, often with an architect, around $265 to $330 per square foot. Relevant Buildings in Oregon City works in container and modular construction at $351 to $651 per square foot.

Willamette Valley, covering Salem, Albany, Corvallis, and Eugene, runs from standard to niche. ideabox in Salem builds standard and custom modular and manufactured homes at roughly $400 to $527 per square foot. Future Homes of Albany carries manufactured, modular, park model, and tiny homes. Oregon Cottage Company in Eugene focuses on tiny homes for the cottage market.

Central Oregon, around Bend and Redmond, is a high growth second home market. Future Homes of Redmond sells manufactured and modular homes plus park models and tiny homes, and several Portland based designers deliver into the area.

Southern and Eastern Oregon, around Medford, Ashland, and Hines, is retailer territory. Diamond Forge Homes in Hines handles manufactured, modular, and park model homes for the region. KIT Custom Homebuilders supplies the Medford area through local retailers.

Statewide manufacturers round out the field. Skyline, based in McMinnville, quotes roughly $100 to $185 per square foot installed across manufactured and modular lines. Palm Harbor Homes runs six or more Oregon locations at about $121 to $144 per square foot for manufactured homes. DC Structures in West Linn sells prefab kits at $39.30 to $82.90 per square foot, before site work. Method Homes, based in Seattle, delivers high end modern prefab into Oregon at $439 to $944 per square foot.

Browse the full directory of modular home manufacturers to filter by build type and price band.

Oregon ADU rules and modular homes

A modular home can serve as an accessory dwelling unit in Oregon, and the state has spent the better part of a decade making that easier. SB 1051, passed in 2017, required cities over 2,500 people and counties over 15,000 within urban growth boundaries to allow at least one ADU on a single family lot. By July 2018, most Oregon cities permitted ADUs by right, subject to local size and design rules. HB 2001 in 2019 went further, removing owner occupancy requirements for long term rentals and barring cities from forcing off street parking on ADU applicants.

SB 458, from 2021, is often lumped in with these but covers something different. It enables lot divisions for middle housing, meaning duplexes, triplexes, quadplexes, townhouses, and cottage clusters, so each unit can be owned separately. It is not the ADU law. HB 2001 and SB 1051 are.

Modular homes qualify as ADUs because Oregon statute treats a prefabricated structure built to state building code as a permitted dwelling. Size is the main constraint. The state model code caps detached ADUs around 800 to 900 square feet, or 75 to 85 percent of the primary home’s floor area, whichever is smaller, and counties set their own limits from roughly 500 to 1,200 square feet. On rural residential land outside an urban growth boundary, the property usually has to be at least 2 acres, the ADU caps at 900 square feet, and it must sit within 100 feet of the existing house.

Portland is the standout on cost. The city waives system development charges for ADUs, which can save tens of thousands of dollars against a comparable build elsewhere in the state. Builders set up for this work include Dweller, DC Structures, Hiline Homes, and True Built Home. For more on small footprint options, see our guide to modular ADUs and tiny homes.

Permitting: modular versus manufactured

Oregon permits the two home types through two different systems, and knowing which one applies saves weeks.

Manufactured homes go through the Oregon Building Codes Division, which administers the federal HUD manufactured dwelling program on HUD’s behalf. The home is built to HUD standards, receives a HUD tag confirming it can be sold and installed in Oregon, and the buyer pulls an installation permit from the local building department before setup. The installer must hold BCD certification, the permit runs 180 days with written extensions available, and ownership is recorded through Oregon’s Manufactured Home Ownership program.

Modular homes skip that program entirely. They go through the same standard local building permit as a site built house. Plans are submitted to the local building department, a permit is issued, and the home is inspected at each stage through to a certificate of occupancy. The factory built modules are inspected at the plant by a state approved third party agency, which provides the documentation the local department relies on.

	Manufactured (HUD)	Modular (state code)
Code standard	Federal HUD code	State and local IRC
Oregon BCD program	Yes	No, standard local permit
HUD tag required	Yes	No
Certificate of occupancy	No, title based	Yes, same as site built
Permanent foundation	Optional	Required

Standard residential permits in most Oregon jurisdictions take 2 to 6 weeks. High demand metros like Portland and coastal or flood zone sites run longer. Because permitting happens while the factory builds the home, it does not necessarily add to the total project time if you plan the overlap.

Financing a modular home in Oregon

A modular home on owned land with a permanent foundation is real property, so it qualifies for the same loans as a site built house with no modular specific restrictions. That opens the full range of products.

Conventional mortgages are available from any lender, with standard underwriting and a 2026 baseline conforming limit of $832,750 in Oregon, higher in costly metro counties. FHA Title II loans treat modular homes exactly like site built homes, with 2026 Oregon limits running from a $541,287 floor to a $762,450 ceiling in Hood River County, the state’s highest-cost FHA area. VA loans cover eligible veterans with zero down and no loan ceiling at full entitlement. For a home that does not yet exist as collateral, a construction to permanent loan funds the build and converts to a standard mortgage at completion.

Lower income and first time buyers have another route. Oregon Housing and Community Services runs the FirstHome program for first time buyers at or below the area median income, pairing a competitive rate mortgage with down payment assistance of 4 or 5 percent of the loan, up to $60,000 or 20 percent of the purchase price, whichever is less. It works through approved lenders statewide and applies to FHA, VA, and USDA loans.

Manufactured homes are the harder case. FHA Title I lends on homes sited on leased land but caps the loan amount. FHA Title II and conventional loans require owned land and a permanent foundation. Some lenders decline manufactured homes outright, and a home left as personal property usually ends up on a chattel loan at a higher rate. Confirm the classification before you shop the loan, because it changes everything downstream. Our financing guides walk through each product in detail.