A medical office building (MOB) in Portland has a non-negotiable ADA accessibility obligation. The 2010 ADA Standards for Accessible Design, Section 406, set the running slope, cross slope, flare-slope, and detectable-warning requirements for every curb ramp on an accessible route. For a Portland MOB, that means every ramp from the patient parking lot to the building entrance, from the ambulance-access lane to the urgent-care entrance, and from any accessible parking stall to the connecting sidewalk has to meet the spec. Cojo installs ADA-compliant curb ramps at MOBs across Portland Multnomah County, and this guide explains how to scope the work so the project closes inside the after-hours window and the patient-access continuity holds.
The ADA 2010 Section 406 Spec, in Plain Language
Section 406 sets a running slope of 1:12 maximum (8.33 percent), a cross slope of 1:48 maximum (2.08 percent), a ramp width of 36 inches minimum, and a level landing at the top of the ramp at least 36 by 36 inches. Flare slopes on the sides of a ramp where they transition to the adjacent walking surface are limited to 1:10 (10 percent) maximum. Detectable warning surfaces (truncated domes) are required at the bottom of every ramp where it meets a vehicular route -- they have to extend the full width of the ramp and be 24 inches deep in the direction of travel.
The most common Portland MOB compliance failure is the cross slope on the ramp surface itself. A ramp built to 1:12 running slope can still fail compliance if the cross slope drifts above 2.08 percent. A field measurement with a digital level catches this before the patient complaint or ADA demand letter arrives. The ADA curb ramp slope requirements reference page covers the field measurement protocol.
Portland MOB Operating Constraints
Patient-access continuity is the operational constraint that drives every Portland MOB ADA scope. The MOB cannot route patients away from accessible entrances during business hours; the contractor has to work after-hours or schedule around clinic-day-off windows (often Friday afternoons or Saturday-Sunday). Ambulance-access lanes have an even stricter constraint -- they cannot be blocked for any extended window because emergency-medical operations depend on them. The fix is a phased mobilization that takes one ramp at a time, with temporary ADA-compliant routing in place during the work.
HIPAA-adjacent vendor vetting also applies. The MOB's facility manager will ask the contractor to provide insurance certificates, CCB license verification, and sometimes a vendor agreement that acknowledges patient-area access restrictions. Cojo carries the required insurance and CCB licensing and handles the vendor vetting up front.
Multnomah County and Portland City Permitting
City of Portland permitting for ADA curb ramp installation depends on the scope. A single-ramp replacement on an existing accessible route generally falls under a minor public-works permit. A multi-ramp project that affects pedestrian circulation patterns may trigger a site-development review. Portland's Bureau of Development Services (BDS) and Portland Bureau of Transportation (PBOT) coordinate on the review for ramps that interface with the public right-of-way.
For MOBs on a hospital or campus property, the campus master-plan ADA inventory usually drives the scope. Most major Portland health systems maintain an inventory of every curb ramp on their property with field-measured compliance data, which makes the bid-document preparation much faster than a site without that inventory.
Industry Baseline Range
| Project Type | Cost Per Ramp | Typical Project |
|---|---|---|
| Single ramp replacement (standard width) | $1,800 to $4,500 | $1,800 to $4,500 |
| Multi-ramp replacement (5 to 10 ramps) | $1,500 to $3,800 per ramp | $7,500 to $38,000+ |
| Ramp + adjacent sidewalk panel | $2,500 to $6,500 | $2,500 to $6,500 |
| Detectable warning retrofit (only) | $400 to $1,200 per panel | $400 to $12,000+ |
Current Market Reality
Portland MOB ADA scopes rarely land at baseline. After-hours premium labor, traffic-control during ambulance-access lane work, hidden sub-base conditions under the existing ramp, and concrete-cure waits all push the real number up. The cure-wait alone can add 5 to 10 days of patient-route detour management depending on the concrete mix specified -- high-early-strength mixes get the ramp back in service in 24 to 48 hours but add 15 to 30 percent to the concrete cost.
Phasing Around Clinic Operations
Most Portland MOBs operate clinic hours Monday through Friday with reduced weekend coverage. The cleanest phasing window is Friday evening through Sunday afternoon, with the ramp accepting foot traffic by Monday morning. High-early-strength concrete mixes make this window workable for single-ramp replacements. Multi-ramp projects phase across several weekends.
Cojo's concrete services handles the curb ramp installation, and the related Portland parking lot striping for ADA accessible stall layout, accessible aisle painting, and ADA signage post-installation, plus the Oregon asphalt paving cost baseline on parking-lot scopes that include both asphalt and concrete work.
What the Practice Manager and MOB Operations Lead Decide
The buyer at a Portland MOB is usually the practice manager (for a single-tenant MOB) or the MOB operations lead (for a multi-tenant MOB). Three levers move cost: scope (single ramp, full inventory, or partial), schedule (single weekend or multi-weekend phasing), and concrete mix (standard cure or high-early-strength). For an active ADA complaint or demand letter, the high-early-strength mix usually wins on the schedule lever even at the premium price.
For MOBs that are part of a broader campus ADA upgrade -- common at major Portland health systems -- bundling the curb ramp work with parking-lot restripe per hospital and medical office striping discipline reduces mobilization overhead by 10 to 15 percent.
Common Failure Patterns Found at Site Walks
A site walk of an existing Portland MOB accessible route usually surfaces three failure patterns. The first is cross-slope drift on ramps poured before 2010. The second is detectable-warning panels that have lifted, cracked, or worn through. The third is flare-slope drift at the side transitions, which creates a tripping hazard at the curb-flare interface.
Catching these failures at the walk-through stage and addressing them in a single bundled scope reduces mobilization overhead and gets the campus current with the 2010 Standards in one capital event. Portland MOB facility managers who run their ADA transition-plan refreshes on a 5-to-7-year cadence typically find 4 to 10 ramps in this combined failure pattern at each refresh -- enough volume to make a single multi-ramp mobilization the most cost-effective approach.
Get a Portland MOB ADA Curb Ramp Quote
Every Portland MOB curb ramp scope sits on its own combination of existing-condition compliance gap, patient-access constraint, and after-hours phasing window. The only way to land an accurate number is a site walk with field measurement of every ramp on the accessible route. Cojo is CCB licensed and insured and has installed ADA curb ramps at MOBs across Portland Multnomah County. Contact us at /contact to schedule the walk.