Asphalt
Asphalt Paving in North Plains, Oregon: 2026 Cost & Service Guide
Cojo
May 29, 2026
7 min read
North Plains is a small, fast-growing town on the rural northwest edge of Washington County, sitting between Hillsboro and the Coast Range foothills off Highway 26. It is surrounded by farmland and nurseries, with a compact downtown and a steady stream of new residential growth. Paving here runs to residential driveways, rural-access and farm drives, and small-commercial lots. The ground is Tualatin Valley farm soil: fine, fertile, and slow to drain, which makes the sub-base the make-or-break part of any paving job.
This guide covers what asphalt paving involves in North Plains, the cost ranges to expect, and the permitting that comes with it.
Asphalt pricing moves with surface area, sub-base condition, site access, and the going rate for liquid asphalt. The figures below are industry baselines, not a Cojo quote, and real Oregon costs frequently run higher.
Industry baseline ranges shown below. Actual costs vary with sub-base work, thickness, site access, and material pricing.
| Project Type | Typical Size | Industry Baseline Range |
|---|---|---|
| Residential driveway (new) | 600–1,000 sq ft | $4,000–$8,000 |
| Driveway resurface (overlay) | 600–1,000 sq ft | $2,500–$5,000 |
| Small commercial lot | 5,000–10,000 sq ft | $25,000–$60,000 |
The Tualatin Valley soil around North Plains is great for growing things and tough for paving over. It is fine-grained, holds water through the wet season, and loses strength when saturated. Pavement built on a base that shifts will alligator-crack and rut within a few seasons. Rural and farm drives that carry equipment and trucks see even more load, raising the stakes on the base spec.
A proper build for these soils means excavating to a stable depth, laying geotextile fabric where the subgrade is soft, and compacting a deep crushed-rock base in lifts. The aggregate section often needs to be thicker here than on firmer ground. Drainage is designed in from the start so water sheds off the surface rather than ponding and soaking the edges.
A residential driveway in North Plains typically goes down as 2 to 3 inches of compacted asphalt over 4 to 6 inches of base. A commercial lot, nursery drive, or farm-access road carrying trucks and equipment needs a heavier section, often 3 to 4 inches of asphalt over 6 to 8 inches of base, sometimes in two lifts. Match the structure to the real load.
Most residential driveway paving inside North Plains does not require a building permit, but access connections do. Highway 26 runs just south of town and is an ODOT facility, so any approach onto a state highway needs an ODOT approach permit. Tie-ins to county-maintained roads go through Washington County's road department.
North Plains has seen significant growth, and the county takes stormwater and erosion control seriously. Projects that disturb significant ground or alter drainage can trigger county requirements. A contractor who works Washington County will know which thresholds your project is near and pull the right permits before breaking ground.
A typical North Plains job runs through:
Residential driveways often wrap in a day or two once the base is ready. Commercial and farm-access jobs take longer.
Asphalt needs warm, dry weather to bond and compact, so the reliable window in the Tualatin Valley runs roughly late spring through early fall. The summer months are busiest for every Washington County contractor, so booking in spring for early-summer work usually secures better scheduling. New pavement benefits from sealcoating later, but let fresh asphalt cure for several months first.
If you are not sure whether you need new pavement or just repairs, our signs your driveway needs repaving guide helps, and driveway repair in North Plains covers the repair side.
North Plains farm-country soil and its mix of residential, commercial, and ag paving reward a contractor who builds the base for the real soil and load rather than pouring the same section everywhere. Serious drainage design and proper ODOT and Washington County permitting are what keep pavement from failing early. Cojo serves North Plains and the surrounding area, plus the broader Washington County asphalt paving market and nearby asphalt paving in Hillsboro.
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