When an existing building undergoes a renovation, the building code may require accessibility upgrades to the path of travel from the public right-of-way to the renovated area — even if the renovation itself has nothing to do with accessibility. This requirement catches building owners off guard and can add tens of thousands of dollars to a renovation budget. Understanding the trigger and the scope is essential for accurate project budgeting.

The Trigger

The ADA Standards for Accessible Design (28 CFR 36.402) and the California Building Code (CBC 11B-202.4) both require that when an alteration is made to a "primary function area" of an existing building, the path of travel to the altered area must be made accessible — to the extent that the cost of the path-of-travel improvements does not exceed 20 percent of the alteration cost.

Key definitions:

  • Alteration: Any change that affects usability, including renovation, remodeling, rearrangement of walls, and changes to mechanical, electrical, or plumbing systems. Ordinary maintenance (painting, reroofing, wallpapering) does not count.
  • Primary function area: An area where the major activities of the building occur. For offices, it is the office space. For retail, it is the sales floor. For schools, it is the classrooms. Restrooms, break rooms, and storage areas are not primary function areas.
  • Path of travel: A continuous, unobstructed route from the altered area to the site arrival point (parking, public transit, sidewalk). It includes the walkway, doorways, restrooms serving the altered area, telephones, and drinking fountains along the route.

The 20 Percent Rule

The cost of the path-of-travel improvements is capped at 20 percent of the alteration cost. If the alteration costs $200,000, the maximum required investment in path-of-travel improvements is $40,000. If the full path-of-travel compliance would cost $80,000, only $40,000 of improvements are required — but the improvements must be prioritized per the code.

Priority Order for Improvements

When the 20 percent cap is reached before full compliance is achieved, the improvements must be prioritized in this order:

  1. Accessible entrance — at least one entrance must be accessible
  2. Accessible route to the altered area — from the accessible entrance to the renovated space
  3. Accessible restrooms — at least one restroom serving the altered area must be accessible
  4. Other items — drinking fountains, telephones, signage, and other path-of-travel elements

What Counts Toward the Alteration Cost

The alteration cost is the total construction cost of the renovation, including labor, materials, and contractor overhead and profit. It does not include soft costs (architect, engineer, permits) or furniture and equipment. Some jurisdictions include the cost of the accessibility improvements themselves in the alteration cost when calculating the 20 percent threshold; others do not. Check with the building department for the local interpretation.

Common Path-of-Travel Improvements

The specific improvements needed depend on the existing conditions, but common items include:

  • Curb ramp construction or modification — if the existing curb ramp does not comply (too steep, no truncated domes, no landing), it must be upgraded. Cost: $3,000 to $8,000 per ramp.
  • Accessible parking — if the parking lot does not have the required number of accessible spaces, or the spaces do not comply (wrong size, wrong slope, no signage), they must be brought into compliance. Cost: $2,000 to $5,000 per stall for striping and signage; $10,000+ if regrading is needed.
  • Sidewalk repairs — if the accessible route has surface defects (cracks greater than 1/2 inch, heaving, cross-slope exceeding 2 percent), the sidewalk must be repaired or replaced. Cost: $8 to $15 per square foot of sidewalk replacement.
  • Door hardware — lever handles replacing knob handles, closers adjusted to 5-pound maximum opening force, thresholds reduced to 1/2 inch maximum. Cost: $300 to $1,500 per door.
  • Restroom upgrades — grab bars, compliant clearances, accessible fixtures, mirror height, signage. Restroom accessibility upgrades are often the most expensive single item. Cost: $5,000 to $25,000 per restroom.

Cumulative Trigger

In California, CBC 11B-202.4 includes a cumulative trigger: if a building undergoes multiple alterations over time, and the cumulative cost of those alterations since 1982 (when the accessibility requirement took effect) exceeds the valuation threshold, the path-of-travel requirement applies. This means that even a minor renovation can trigger path-of-travel upgrades if the building has had prior renovations that, in total, push the cost over the threshold.

This cumulative requirement is difficult to track and is inconsistently enforced. Some building departments track renovation valuations across permit applications; others do not. Regardless of enforcement consistency, the legal requirement exists, and a CASp (Certified Access Specialist) inspection can identify the obligation.

Practical Advice

  1. Budget for it early. When estimating renovation costs, include a line item for path-of-travel improvements equal to 20 percent of the construction cost. If the improvements are less, the budget is conservative. If they hit the cap, you are covered.
  2. Get a CASp inspection. Before finalizing the renovation scope, hire a Certified Access Specialist to inspect the existing path of travel and identify the improvements needed. This gives you a specific scope and cost estimate, rather than a vague 20 percent contingency.
  3. Document the improvements. Keep records of all path-of-travel improvements, their cost, and the alteration that triggered them. This documentation protects the building owner in the event of a future ADA complaint or lawsuit.