Curbing
Parking Lot Curbing Installation in Hillsboro, Oregon
Cojo
May 7, 2026
6 min read
Parking lot curbing in Hillsboro, Oregon, runs through Hillsboro Community Development Code Chapter 12.40 (Public Works Construction Standards), Engineering Design Standards, and ADA Accessibility Guidelines for any ramp tying into the public sidewalk. Hillsboro's Silicon Forest tech corridor (Intel Ronler Acres, Hawthorn Farm, Orenco Station) and the Tanasbourne commercial area account for most of the city's commercial parking-lot curb scope.
What follows: how our crews scope, permit, pour, and inspect parking lot curbing in Hillsboro — including the Clean Water Services coordination shared with the rest of Washington County.
Direct answer: A standard Hillsboro parking lot curb is 6 inches tall, 6 to 8 inches wide at the base, slipformed in Class 4000 concrete with 5 to 7 percent air entrainment per Hillsboro Community Development Code 12.40 and ODOT 00759. Expansion joints sit every 10 to 15 linear feet, and ADA curb ramps follow the 1:12 slope rule. Cojo crews slipform 100 to 200 linear feet per day on commercial Hillsboro lots.
Hillsboro Engineering Design Standards reference ODOT 00759:
| Spec | Hillsboro / ODOT 00759 |
|---|---|
| Compressive strength | Class 4000 (4,000 PSI at 28 days) |
| Air entrainment | 5% to 7% |
| Maximum water-cement ratio | 0.45 |
| Slump (slipform) | 1 to 2 inches |
| Surface tolerance | 1/4 inch over 10 feet |
| Subgrade compaction | 95% standard Proctor |
| Base aggregate | 4 inches compacted under curb line |
In September 2025 our crews installed 1,820 linear feet of new 6-inch barrier curb plus seven ADA curb ramps at a 56,000-square-foot tech-office campus in the Hawthorn Farm area. The project included a curb-and-gutter retrofit that triggered a Clean Water Services BMP review. We coordinated the stormwater design with the property's civil engineer, added a vegetated filter strip along the parking-lot perimeter, and slipformed Class 4000 perimeter curb at 175 linear feet per day. Hillsboro Public Works inspector signed off on day 13 after the CWS BMP commissioning. The project added cast-in-place truncated dome panels at all seven ADA ramps.
Industry Baseline Range
| Curb Type | Price Per Linear Foot (Installed) |
|---|---|
| 6-inch barrier curb (slipformed) | $12 to $22+ |
| Mountable curb (4-inch face) | $10 to $18+ |
| Curb and gutter (combined section) | $18 to $32+ |
| ADA curb ramp (each, with truncated domes) | $1,400 to $3,800+ |
| Hand-formed irregular radius | $20 to $40+ |
Hillsboro tracks Portland metro pricing because of shared batch plants and Washington County labor markets. CWS BMP design and commissioning add 5 to 12 percent to projects with stormwater-trigger retrofits. Demolition adds $6 to $14 per linear foot. See our broader parking lot curbing cost breakdown.
Our Hillsboro-area curbing crews regularly work in:
For combined paving and sealcoating scope, see the existing sealcoating Hillsboro Oregon page.
The Silicon Forest blocks have three operational realities that shape every curb job:
Hillsboro ADA Transition Plan applies the 1:12 max running slope rule, 36-inch min width, 4-foot top landing, and detectable warning surface (truncated domes) per ADAAG 4.7. Cast-in-place truncated dome panels are our default on every new pour. See ADA curb ramp slope requirements for the full ADAAG walk-through.
We handle slipform and hand-formed concrete curbing across Hillsboro, Cornelius, Forest Grove, and surrounding Washington County — Hillsboro Public Works permits, Clean Water Services BMP coordination, ADA-compliant ramp work, and tech-campus phased sequencing. Contact Cojo for a site walk and a written scope.
A practical guide to sealcoating apartment and condo parking lots. Covers phased scheduling, tenant communication, cost allocation, liability, and ROI for property value.
Get accurate 2026 asphalt paving costs for Oregon driveways, parking lots, and roads. Per-square-foot pricing, cost factors, and money-saving tips.
Compare asphalt and concrete driveways side by side: cost, durability, maintenance, appearance, and climate performance for Oregon homes.
Have a question about this topic? We'll respond within 24 hours.