ADA sign contrast and finish
Light on dark or dark on light, with a non-glare finish on characters and background (703.5.1). The 2010 Standards set no minimum percentage and no colors; higher contrast is better, and the Access Board says so.
What has to contrast
| Element | Finish and contrast rule | Section |
|---|---|---|
| Visual characters and background | non-glare; light/dark contrast | 703.5.1 |
| Raised characters that are also the visual characters | non-glare; light/dark contrast | 703.5 exc. |
| Raised characters with separate visual characters | exempt | Access Board guide |
| Braille | exempt | Access Board guide |
| Pictograms and their field | non-glare; light/dark contrast | 703.6.2 |
| Accessibility symbols and background | non-glare; light/dark contrast | 703.7.1 |
Why there is no percentage
The 1991 guidelines carried an advisory note suggesting about 70 percent contrast, calculated from the light reflectance values of the two colors. Advisory notes are not requirements, and the 2010 Standards dropped the number. The Access Board's explanation is practical: light reflectance is measured with a spectrophotometer, and field results vary with the material, the finish and the lighting. The rule it kept is the part anyone can check by eye: one light, one dark.
The Board's advice still points toward more contrast: legibility for people with low vision improves as contrast rises, and shadows, glare, textured backgrounds and busy patterns all cut it. A mid-grey on a tan background passes the letter of "light on dark" and fails the reader.
Glare is the one that gets missed. Gloss acrylic faces, gloss clear coats and polished metal all reflect ceiling lights straight into the reader's eyes, and the rule is non-glare for both characters and background. Specify matte or satin face finishes and matte inks, and check samples under the real lighting if the client has chosen a metallic.
Pictograms and symbols
Pictograms that label rooms, and the four accessibility symbols (the International Symbol of Accessibility, TTY, volume control telephone and hearing loss), carry the same finish and contrast rule as characters (703.6.2, 703.7.1). The ISA is usually white on blue, but the federal rule only requires contrast; states can require specific colors, and California does for parking signs.
Questions
What is the ADA contrast requirement for signs?
Characters must contrast with their background, either light characters on a dark background or dark on light, and both must have a non-glare finish (703.5.1). The 2010 Standards set no minimum contrast percentage.
Is 70 percent contrast required for ADA signs?
Not under the 2010 Standards. The 70 percent figure comes from an advisory note in the 1991 guidelines, not an enforceable rule. It is still a sensible target, and some specifications and state codes ask for it, but the federal rule only says light on dark or dark on light.
Are there required colors for ADA signs?
No. The Standards do not specify any colors. Accessible parking signs are often blue and white by convention, and some states require it: California requires the International Symbol of Accessibility in white on blue for parking.
Does braille have to contrast?
No. Finish and contrast requirements do not apply to braille, so clear braille is fine.
- Access Board guide, Chapter 7: Signs (common questions)
- 2010 ADA Standards for Accessible Design (U.S. Access Board)
Last checked against the source text 2026-09-25. Section numbers refer to the 2010 ADA Standards unless marked otherwise.