McMinnville is the Yamhill County seat and home to Linfield. City of McMinnville and unincorporated Yamhill County are different reviewers, so a Third Street address and a five-acre parcel off Three Mile Lane can share a mailing city and still file in different systems.
Wolf builds in Battle Ground, Washington, just north of Portland, and delivery runs I-5 south, then 99W. We don’t have a recorded Wolf delivery in McMinnville yet, but the city is inside our Washington-and-Oregon turn-key area, and we review lots here the same way we do the rest of the Valley.
City of McMinnville or Yamhill County first
Look up the parcel before you sketch anything. If the lot is inside city limits, McMinnville Community Development and Municipal Code Chapter 17 apply. If it isn’t, you’re in county land use, even when the mail says McMinnville.
Oregon cities must allow ADUs, but the local rules still matter. Read the Oregon ADU rules guide and the Yamhill County ADU rules guide. The city or county reviews the site plan and issues the permits. We coordinate that process for your project.
Inside McMinnville, the ADU standards we use on evaluations are in MMC 17.15.010 (confirm the current section when you file):
- An ADU may be a conversion, an addition, or a detached unit on a lot that already has a primary single-family dwelling.
- Size: 40 percent of the primary dwelling exclusive of the garage, or 800 square feet, whichever is less. Minimum 300 square feet.
- The unit must meet the zone’s setbacks, height, and building code in effect at construction.
- Appearance (siding, roofing, materials, and color) must coincide with the primary dwelling.
- One additional off-street parking space (on top of parking required for other uses on the lot).
- Independent services: water, sewer, and electricity.
- Not more than one ADU per lot.
- Kitchen, bathroom, living, and sleeping areas must be completely independent from the primary dwelling.
Anything not covered in that section or the current handout depends on the lot. Ask with the address.
Unincorporated Yamhill County has its own rules. From the county guide: one ADU per principal dwelling, and being inside or outside a UGB changes almost everything. Rural parcels generally need at least two acres, the ADU can be no farther than 100 feet from the existing house, size commonly caps around 900 square feet, and short-term rental of the ADU is prohibited. Resource-zone and wildfire setbacks can apply. Don’t use the city’s 800-square-foot cap on a rural lot, or the county’s two-acre rule on a city lot.
How McMinnville takes a permit
Complete packets move. Incomplete site plans, missing utility letters, and elevations that don’t match the house come back. Here’s the order we work in:
- Confirm a dwelling is allowed in the zone, using the city’s maps and MMC 17.15.010.
- Plot plan: existing house, proposed cottage, the zone’s setbacks, parking, utilities, and a truck path that works downtown or on a Three Mile Lane driveway.
- Engineered modular plan set. Wolf homes are modular, built in our factory under Oregon’s BCD prefabricated-structures program, delivered with a state insignia of compliance, and placed on a local foundation. They aren’t HUD (the federal standard for manufactured homes) manufactured homes and they aren’t on wheels. McMinnville still reviews the foundation, placement, utilities, and appearance standard.
- Submit to the city (or Yamhill County if unincorporated), including how water and wastewater will be handled. Site prep is part of the job.
- Inspections as called, then occupancy. Keep the approved drawings on site.
A city submittal usually includes the application, a site plan with property lines and setbacks, floor plans, water and wastewater details, and the extra parking space. Because of the appearance standard, siding, roofing, and color get decided earlier here than in cities without that rule. Oregon BCD inspects the module in the factory, and McMinnville inspects the foundation, placement, and utility connections.
If the lot is outside the UGB, start with Yamhill County Zoning Ordinance Section 1014 and the zone’s own chapter. The two-acre and 100-foot tests are only a first screen. A parcel can pass both and still fail on septic, access, or a resource-zone setback.
Lots we see
Downtown McMinnville has a real main street, which is why people want a backyard unit within walking distance of it. It’s also why a crane on a fully parked block takes planning. The older grid around Third Street and Linfield can be tight, with short lots, alleys that look useful until you measure the turning radius, mature trees, and houses close to the property line. Westside and Baker Creek-area plats are often wider but still have HOA (homeowners association), tree, and drainage questions, and they’re still under the 800 / 40 percent limits. Three Mile Lane has highway frontage, industrial parcels, and lots that look like county wine country from the road but sit inside or against the UGB, or the reverse, so look the parcel up on GIS before you plan.
Models that fit 800 / 40 percent
Wolf doesn’t sell HUD-code manufactured homes, and a home on wheels doesn’t count as an ADU here.
- Model K (~432 sq ft). One-bedroom ADU on a typical city lot.
- Model E / Model F (~616 sq ft). Two bedrooms when 40 percent of the primary dwelling still allows it.
If the house is 1,400 square feet, 40 percent is 560, so measure first. Model J (~828 sq ft) and Model L are over the city’s 800 cap as published, and Model I isn’t ADU-sized under this code. County rural lots use the county’s ~900-square-foot cap instead of McMinnville’s 800.
The “coincide with the primary dwelling” standard is why we talk about siding and roofing early. A factory home can match the house, but a metal roof next to a composition-roofed house will likely draw a comment letter.
ADU, tiny home, or granny flat
If it has a kitchen and bath, the city treats it as a dwelling. Family use and long-term rental are the usual choices. Short-term rentals fall under separate rules, and McMinnville has spent years working on its short-term rental standards, so don’t assume an ADU permit covers a vacation rental. Yamhill County prohibits short-term rental of the ADU on county lots. Tell us the intended use on the evaluation.
Cost and timeline
The model gives us a reliable starting home price. We price trenching, electrical capacity, parking work, and any required siding match after reviewing the property. Factory construction keeps the home out of Valley rain, but city review and site prep still drive the schedule.
The Model K starts at $85,500 for the home itself. Permitting, delivery, installation, and site work are listed separately in your property-specific proposal. McMinnville doesn’t offer the same ADU SDC waiver as Salem, so Oregon SDCs and local connection fees go into the proposal after we confirm current fees for your property.
A Third Street backyard and a Three Mile Lane acre won’t cost the same, so we quote after a property evaluation. Financing is usually a HELOC, cash-out refinance, or a construction-to-permanent lender who has worked with factory-built ADUs. See financing.
Delivery and the turn-key service
McMinnville is turn-key Oregon for us: permitting support, site work, production, delivery, and setup as one job. Punch list visits are a drive down the Valley. None of that changes MMC 17.15.010.
Delivery from the factory takes about half a day when the last mile is clear. 99W through McMinnville is the usual route from I-5. A 12-foot-wide Model K is easier to get in than a 616-square-foot E on a street with parking on both sides, and overhead lines, firs, and a driveway built for a passenger car still decide the day. Third Street event days, Linfield-area parking, and Three Mile Lane highway access all affect when a module can roll, so we put them on the schedule early.
Newberg, up 99W, runs its own permit counter. Salem is in a different county with different SDC rules. Dundee and Lafayette are nearby with their own permit offices.
Weather, soils, and utilities
The Willamette Valley is wet from fall through spring, and the house is built indoors. On the lot, silts and winter water affect excavation and erosion control. Summer is the easier set window. Winter sets happen too, with tighter site controls.
Most in-city lots are on city water and sewer. You still need to check laterals, a cleanout, and whether the electrical service can carry a second dwelling, especially since the code requires independent services. Outside the UGB you’re often on well and septic, where the rural ADU rules and septic design usually decide the project. If you don’t know which you have, it’s the first thing we check.
Site work
Foundation excavation, trenching, grading, and minor tree work are part of a normal McMinnville job. A downtown alley that looks like a delivery path, or a Three Mile Lane driveway built for a passenger car, is why we measure access early. We bring a standard delivery trailer, and a crane when the swing needs it. We weather-seal the same day when we can, then finish the mechanical and plumbing tie-ins. Two-piece plans add a day to join the halves.
What to send
An address is enough to start. Useful extras: a survey, a tax-lot and zoning printout, a prior planning letter, the square footage of the existing house (needed for the 40 percent test), photos of the backyard and the street approach, and whether the unit is for family, long-term rental, or a cottage you might live in. We check city versus county, the size cap, parking, and whether a truck can reach the pad.
If you’ve already picked a model, we’ll still check it against 800 square feet and 40 percent of the primary dwelling before treating it as the plan. If a lot won’t clear the size cap or can’t take a truck, you’ll hear that at the evaluation.
After the set
Inspections, walk-through, punch list, keys, and warranty. McMinnville inspectors sign off on occupancy for city lots, so keep the approved drawings on site until they do.
Send the address. Tell us city or county, where the building would sit, and whether it’s for family, rental, or you. We’ll match a model to the size cap that applies.
