Parking Lot Curbing Installation in Hillsboro, Oregon

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.

What is the right curb spec for a Hillsboro parking lot?

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.

What permit applies in Hillsboro?

• Inside private parking lot: Hillsboro building permit covers the curb work as part of site civil scope.
• Right-of-way work: Hillsboro Public Works Permit. Review takes 4 to 8 weeks.
• Stormwater changes: Hillsboro Engineering Design Manual triggers a stormwater review when curb-and-gutter retrofit changes flow into the city or Clean Water Services regional system.
• Tech-corridor parcels: Some Intel-adjacent and Hawthorn Farm campus parcels have additional internal review processes through master-developer agreements.

What concrete mix does Hillsboro require?

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

Hillsboro-area concrete supply runs through Knife River, CalPortland, and Glacier Northwest. The mix-design ticket gets reviewed before pour.

A recent Hillsboro install of ours

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.

How much does parking lot curbing cost in Hillsboro?

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+

These figures reflect published industry averages. Current market pricing varies significantly and actual quotes may fall well outside these ranges based on site-specific conditions, material costs, and project complexity.

Current Market Reality

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.

What neighborhoods do we cover for curbing in Hillsboro?

Our Hillsboro-area curbing crews regularly work in:

• Hawthorn Farm tech corridor
• Orenco Station
• Tanasbourne (shared with Beaverton)
• Downtown Hillsboro
• South Hillsboro
• North Hillsboro (Intel Ronler Acres adjacent)
• Surrounding Washington County (Cornelius, Forest Grove, North Plains)

For combined paving and sealcoating scope, see the existing sealcoating Hillsboro Oregon page.

Tech-corridor commercial considerations

The Silicon Forest blocks have three operational realities that shape every curb job:

1. Round-the-clock campus operations. Many Hawthorn Farm and Ronler Acres tenants run 24/7 shifts. We schedule pour windows to avoid shift-change traffic and stage barricades for full pedestrian path continuity.
2. High-density employee parking. Tech-campus lots run 90-plus percent occupancy during business hours. We sequence in 4-stall blocks during evenings and weekends to keep peak-hour parking online.
3. Master-developer review layers. Some campus parcels carry covenants that require master-developer architectural review on top of city permits. We confirm both review tracks at the site walk so the timeline accounts for both.

What about ADA curb ramps in Hillsboro?

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.

Ready to scope parking lot curbing in Hillsboro?

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.

---