Truncated dome cost runs $40 to $95 per square foot installed for surface-applied retrofit panels and $25 to $60 per square foot for cast-in-place new construction. Replaceable cast-iron systems sit at the top of the range at $76 to $134 per square foot installed. The 2026 spread reflects material choice (composite, polymer concrete, cast iron), substrate condition (new pour vs. retrofit), and the ADA 705 inspection rigor that has tightened install labor.
This guide breaks down the cost lines that actually move a quote: material per square foot, install labor per square foot, the curb-cut and mobilization charges that load onto small jobs, and the lifecycle math that determines true cost of ownership over 10 to 25 years.
What Drives Truncated Dome Cost?
Truncated dome cost is the sum of five components.
Material per square foot
The product itself ranges from $26 per square foot for budget composite panels and mats to $98 per square foot for replaceable cast-iron systems. Material is roughly 55 to 70 percent of total installed cost on retrofit projects and 45 to 60 percent on new construction.
Install labor per square foot
Surface prep, layout, adhesive or anchor placement, panel set, and ADA 705 verification at completion. Labor runs $14 to $36 per square foot in 2026 depending on system family and crew skill mix. Labor is the line that has climbed fastest in 2025 to 2026.
Mobilization and traffic control
Single-curb-cut jobs carry a $400 to $1,200 mobilization charge that loads disproportionately onto small square-foot counts. A 16-square-foot curb cut absorbs the full mobilization, where a 200-square-foot multi-cut project amortizes it across far more material.
Substrate work
Curb-ramp concrete that needs grinding, leveling, or partial demolition before the dome surface goes down adds $150 to $800 per curb cut. New-construction projects skip this entirely because the dome panel sets into the wet pour.
ADA verification and documentation
LRV contrast verification, dome geometry caliper readings, placement tape measurements, and the documentation packet for the inspection record. Public-bid projects sometimes carry $200 to $600 in verification cost per curb cut. Private retrofits often skip the documentation but still need the install verification.
Truncated Dome Cost Per Square Foot by System
Industry Baseline Range
| System | Material per sq ft | Installed per sq ft (retrofit) | Installed per sq ft (new) |
|---|---|---|---|
| Composite panel | $26 to $48 | $42 to $80 | $36 to $68 |
| Polymer-concrete panel | $32 to $58 | $42 to $76 | $42 to $76 |
| Precast concrete panel | $40 to $70 | not typical retrofit | $54 to $92 |
| Replaceable cast iron | $58 to $98 | $76 to $134 | $72 to $124 |
| Polymer or rubber mat | $26 to $48 | $38 to $72 | not typical for new |
| Stamped overlay | $14 to $28 | $32 to $58 (mobilization-dependent) | not typical |
Current Market Reality
Cast iron and polymer concrete each climbed 12 to 24 percent in 2025 on raw-input costs. Composite was the smallest 2025 increase. Labor climbed 8 to 12 percent across Oregon. ADA 705 inspection rigor has added 30 to 60 minutes of crew time per curb cut at install. Mobilization charges have grown faster than per-square-foot rates because crew transport and traffic-control fixed costs now load a higher share onto small jobs. Single-curb-cut retrofits in 2026 routinely cost more than 2024 multi-cut jobs on the same property.
Per-Curb-Cut Cost Reference
A typical commercial accessible curb cut measures 24 inches by 48 inches (8 square feet) up to 36 inches by 60 inches (15 square feet). Per-curb-cut costs in 2026 in Oregon:
| Project type | Single curb cut | 4 curb cuts (same property) | 10 curb cuts (same property) |
|---|---|---|---|
| Composite retrofit | $760 to $1,500 | $440 to $850 each | $360 to $720 each |
| Polymer concrete retrofit | $820 to $1,600 | $480 to $920 each | $400 to $780 each |
| Replaceable cast iron retrofit | $1,200 to $2,400 | $760 to $1,400 each | $640 to $1,180 each |
| Cast-in-place polymer concrete (new) | $640 to $1,200 | $360 to $720 each | $300 to $620 each |
| Polymer mat retrofit | $620 to $1,150 | $360 to $700 each | $300 to $580 each |
Lifecycle Cost Beyond the Quote
Initial install cost is one number. The 20-year lifecycle cost is what actually drives owner economics.
Composite panel 20-year cost
A $46 per square foot composite retrofit replaces at year 9 to 11 with a full demo and reinstall at $50 to $90 per square foot. Total 20-year cost lands at $96 to $180 per square foot.
Polymer-concrete panel 20-year cost
A $58 per square foot polymer-concrete retrofit replaces at year 13 to 15 with a similar reinstall cost. Total 20-year cost lands at $115 to $200 per square foot. Despite the higher 20-year total, the longer single-cycle service life is preferred by most public-bid specs.
Replaceable cast-iron 20-year cost
A $98 per square foot replaceable cast-iron system swaps the dome plate at year 18 to 22 for $14 to $28 per square foot. Total 20-year cost lands at $90 to $162 per square foot. In plowed regions and high-vehicle paths, this is the lowest 20-year cost system.
Polymer mat 20-year cost
A $42 per square foot mat replaces at year 6 to 8, then again at year 13 to 15. Total 20-year cost lands at $115 to $216 per square foot. The mat advantage is up-front cost and schedule, not lifecycle.
Cost Factors Specific to Oregon
Oregon-specific cost considerations layer on top of the national baseline.
Snow exposure (Bend, Hood River, La Grande, Pendleton)
Snowplow exposure forces cast-iron specs in those regions. The cast-iron premium runs 30 to 60 percent higher install cost than composite alternatives. The lifecycle math still favors cast iron because composite panels in plowed regions fail at year 5 to 7.
Local-jurisdiction inspection rigor
Portland Title 33 and Salem Chapter 79 inspectors run dome geometry calipers and LRV meters at acceptance. Plan for verification time. Eugene EPP and ODOT projects sometimes require additional traffic-control budget.
ASTM C881 epoxy availability
The ASTM C881 epoxy used to bond surface-applied panels has tracked retail-asphalt-binder pricing in 2025. Epoxy costs are up roughly 10 to 14 percent year-over-year. Spec sheets that called out a different epoxy class in 2024 may now require substitution.
Compliance Disclaimer
This article reflects ADA Standards for Accessible Design as of 2026-05-07 and product spec sheets current at publication. Always verify current dimensions, contrast thresholds, and placement requirements with your local jurisdiction and the U.S. Access Board before issuing a final spec. Federal guidance under 36 CFR Part 1191 controls when state or local rules conflict. Lower-cost product selection alone does not satisfy ADA compliance — installation geometry and 705.2 contrast verification at install are equally controlling.
Sources
- ADA Standards for Accessible Design, Section 705 Detectable Warnings, U.S. Access Board, https://www.access-board.gov/ada/
- 36 CFR Part 1191 Appendix D, Detectable Warnings, https://www.ecfr.gov/current/title-36/chapter-XI/part-1191
- FHWA Accessibility Resource Library, https://highways.dot.gov/civil-rights/programs/ada/accessibility-resource-library
- Oregon Department of Transportation, ADA Curb Ramp Design Guide, https://www.oregon.gov/odot/engineering/pages/ada.aspx
From Cojo's Crew
In April 2026 we quoted a 22,000-square-foot Hillsboro retail center for 8 retrofit curb cuts. Six pedestrian-only curb cuts went to polymer-concrete panel at roughly $58 per square foot installed. Two loading-dock approach cuts went to replaceable cast iron at roughly $96 per square foot installed. The blended cost on the property came in 22 percent under an all-cast-iron quote and 16 percent over an all-composite quote. The blended spec wins on lifecycle cost because the loading-dock cuts would have failed composite inside 24 months.