Colour Contrast for Signs — AODA IASR customer-provided accessibility specification
Regulation customer-provided accessibility specification s.16(3) · Province of Ontario
§Source summary
customer-provided accessibility specification s.16(3) — Regulation customer-provided accessibility specification s.16(3)
Signs may need a minimum 70% luminance contrast between characters and their background to ensure readability for people with low vision.
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70% luminance contrast means your letters should be significantly lighter or darker than the background. Black on white achieves 100%. Dark navy on medium grey fails.
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70% minimum luminance contrast
Applies to all text on AODA signs
Calculated using luminance formula
High contrast aids low vision users
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🏛 Official Government Sources
AODA — Integrated Accessibility Standards Regulation
Ontario.ca · March 2026
customer-provided accessibility specification defines accessibility standards for Ontario organizations including signage contrast, tactile requirements, Braille, and wayfinding specifications.
Accessibility for Ontarians with Disabilities Act, 2005
Ontario.ca · March 2026
The AODA is Ontario's accessibility law. Full compliance was required by January 1, 2025. Penalties can apply; check current official sources before relying on a number.
🏢 Industry Organizations
All sources are official government publications or recognized industry authorities. Links verified March 2026. If you find a broken link, let us know.
See Also — Related Regulations
customer-provided accessibility specification IASR s.16
Accessible Signage Overview — AODA IASR customer-provided accessibility specification
AODA + OHSA + Transport Canada
Colour Contrast Minimum Ratio for Compliance Marking
customer-provided accessibility specification s.16(4)
Minimum Font Size for Signs — AODA Ontario
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Shop AODA SignsOr call (289) 228-7021Regulation Quick Facts
- Regulation
- customer-provided accessibility specification s.16(3)
- Jurisdiction
- 🏛 Province of Ontario
- Category
- AODA Accessibility
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