Vendor Accessibility Governance: Drafting SLAs, Warranty Clauses & Acceptance Criteria
When digital agencies deliver inaccessible websites, the client bears full legal liability. Learn how to draft binding accessibility SLAs, warranty clauses, and acceptance criteria.
When an enterprise hires an external digital agency, software house, or third-party contractor to build a new website or mobile application, the contracting business - not the agency - remains 100% legally liable for ADA Title III, EAA, or IS 5568 violations. To mitigate this risk, procurement teams must incorporate binding Accessibility Service Level Agreements (SLAs) and strict acceptance gates into vendor contracts.
The Agency Liability Gap
Many software development agencies deliver visually stunning websites that completely fail basic WCAG criteria. Once final payment is made and the warranty period expires, the client is left with full financial exposure when predatory demand letters arrive.
Four Mandatory Contractual Accessibility Clauses
| Contract Clause | Legal Protection Mechanism |
|---|---|
| 1. Explicit Technical Standard | Warrant that all deliverables conform 100% to W3C WCAG 2.2 Level AA without reliance on overlay toolbars. |
| 2. Pre-Acceptance Audit Gate | Final milestone payment (typically 20-30%) withheld until deliverables pass an independent automated and manual accessibility audit. |
| 3. 12-Month Remediation Warranty | Vendor must remediate any reported accessibility defect within 72 hours at zero additional cost for 12 months post-launch. |
| 4. Legal Indemnification | Vendor indemnifies the client against third-party accessibility demand letters resulting from vendor code defects. |
Defining Strict Remediation Turnaround SLAs
- Critical Blocker (Severity 1): Inability to complete checkout, login, or registration via keyboard/screen reader - Resolution within 24 to 48 hours.
- Major Defect (Severity 2): Contrast violation, missing alt text, or focus order irregularity - Resolution within 5 business days.
Acceptance Testing & Milestone Sign-Off Gates
Never sign off on vendor deliverables based solely on agency assertions. Require a verifiable automated scan report and manual assistive technology verification log.
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