Cojo runs asphalt paving crews into the 97123 zip -- central Hillsboro, including downtown, the Tanasbourne retail node, and the Highway 8 (Tualatin Valley Highway) commercial corridor. The local work is a mix of commercial lot paving and overlay, downtown residential driveway replacement, and tech-tenant adjacencies that need consistent maintenance scopes. Pricing depends on square footage, base condition, and access, but most local jobs land within the published baseline range below.
Asphalt Paving in Central Hillsboro -- The Local Picture
97123 is the Washington County seat and a major Portland-metro commercial node. The footprint covers downtown Hillsboro, the Tanasbourne shopping and office area on the east side, and the Highway 8 corridor that links the two. Each subzone has a different paving profile.
Downtown. Older grid streets with mature trees, small driveways, and small commercial lots. Most surfaces are 20 to 40 years old. Replacement work dominates.
Tanasbourne. Large-format retail and office park with mid-to-late 1990s and 2000s paving. Most lots are in the 15 to 25 year window where overlay is the cost-effective path if the base is sound, or replacement if it isn't.
Highway 8 corridor. Retail strip with frequent tenant turnover. Re-paving and re-striping cycles run on tenant lease schedules, often 5 to 10 years.
Hillsboro city stormwater code applies broadly. New impervious surface over defined thresholds triggers stormwater management requirements -- detention, treatment, or low-impact-development features. New commercial paving in 97123 almost always falls in scope. Replacement paving on existing impervious surface generally doesn't trigger new stormwater obligations, but documentation matters for property managers handling commercial leases.
Paving Scopes in 97123
The four most common 97123 jobs:
- Commercial lot overlay -- 1.5 to 2 inches of new asphalt over an existing, structurally sound base. Best path on lots in the 15 to 20 year window with surface wear but no base failure.
- Commercial lot replacement -- full tear-out, base prep, and 3 to 4 inches of new asphalt over engineered aggregate. Required when the existing surface shows base failure (alligator cracking, settlement, edge breaks).
- Downtown residential driveway -- typically 2 to 3 inches of asphalt over 4 to 6 inches of compacted base, tied to existing sidewalks and street drainage.
- Tech campus and office park -- 3 to 4 inches of asphalt over engineered base, often with ADA, EV stalls, ground markings, and stormwater compliance built into one mobilization.
Right scope depends on what's underneath. We core-sample on larger commercial scopes when the base condition is uncertain.
Asphalt Paving Cost in 97123
Industry Baseline Range
| Project Type | Cost Per Sq Ft | Typical Total |
|---|---|---|
| Residential driveway (downtown) | $2.00 to $10.00 | $2,000 to $15,000+ |
| Driveway resurfacing (overlay) | $1.50 to $5.00 | $1,500 to $8,000+ |
| Small commercial lot (10-30 spaces) | $2.00 to $10.00 | $10,000 to $80,000+ |
| Mid-size commercial lot (50+ spaces) | $2.00 to $8.00 | $30,000 to $300,000+ |
| Commercial overlay (per sq ft) | $1.25 to $4.00 | varies by lot size |
Current Market Reality
The published ranges assume a stable base, easy access, and a single mobilization. Hillsboro commercial work that has to maintain partial lot access during the job, that requires night work, or that finds unexpected base failure during tear-out runs above the baseline. Tanasbourne tenant lots with delivery and customer traffic frequently need staged work over multiple days. Asphalt mix prices track oil markets and have moved meaningfully over the last several seasons. Stormwater compliance adds engineering and inspection cost on larger jobs. Quotes older than 30 to 60 days should be re-validated.
Hillsboro Subgrade and Drainage
The 97123 footprint sits on the Tualatin Valley alluvial plain. Subgrade is mostly Willamette silt loam over clay subsoils -- the standard valley profile. That has two effects on paving:
Drainage matters. Clay holds water; silt loam drains slowly when saturated. A lot with poor surface drainage will pump water into the base, undermining compaction. Most commercial 97123 lots paved in the 1990s have drainage that's adequate but not great by modern stormwater standards. A re-paving project is the chance to grade for proper slope (typically 1.5 to 2.5 percent) and add catch basins or trench drains where needed.
Paving window. Valley clay paves cleanly from late June through early September. May and October work in dry years and don't in wet ones. We schedule 97123 commercial work for the dry stretch and won't pave on a saturated base.
For broader Oregon cost context, see our asphalt paving cost in Oregon guide. For the upstream site-prep stage, see our driveway excavation in Hillsboro article. For the asphalt-vs-concrete decision on residential work, see asphalt vs concrete driveway.
Picking a Paving Contractor in 97123
What to verify:
- Oregon CCB license -- required, verifiable on the CCB website.
- Mix spec on the quote -- thickness, mix type, and base depth.
- Base prep plan -- aggregate depth, compaction spec, and over-excavation for any soft pockets.
- Drainage plan -- slope, catch basins, and any stormwater compliance features.
- Permit handling -- the quote should specify who pulls permits where required.
- Staging plan -- for commercial lots that can't fully close, the quote should show how the work is phased.
- Warranty -- 1 to 2 year workmanship warranty minimum.
The cycle that pairs with paving is sealcoat and crack-fill maintenance. See our commercial sealcoating in Hillsboro guide for the maintenance schedule that doubles pavement life.
Get a Paving Quote for 97123
Cojo runs paving crews across Washington County and the Portland metro from our Hood River HQ and regional field operations. We hold an Oregon CCB license, carry general liability and workers' comp insurance, and quote against the actual site -- including a base condition check, drainage review, and stormwater compliance scope where applicable. If you manage a Tanasbourne commercial lot, a downtown Hillsboro residential project, or a Highway 8 tenant retrofit, request a quote and we'll schedule the walkthrough.