Guides
How to vet web accessibility services for agencies
Web accessibility services for agencies need careful vetting: request named WCAG criteria, live assistive technology demos, and manual audit evidence.
What to take away
- Web accessibility services for agencies split into manual audits, automated scans, remediation, and user testing.
- Ask for named WCAG criteria and live assistive technology demos before you sign.
- Three answers should end the conversation"we only use an overlay," "we test with a screen reader once a year," and "WCAG is optional for small sites."
- The agreement must state the WCAG version, page scope, tested browsers, and who fixes post-launch defects.
When you buy web accessibility services for agencies, you first separate the scopes that are actually different jobs. If you do not, a vendor can hide a weak manual review inside a large automated scan.
Scopes that are actually different jobs
What it covers
- Manual WCAG audit
- A human reviewer checks code, content, and interaction against WCAG success criteria.
- Automated testing setup
- Tools monitor recurring issues such as color contrast and missing alt text.
- Assistive technology user testing
- People who use screen readers, switch devices, or magnifiers test real tasks.
- Legal risk review
- A lawyer or compliance officer reviews ADA exposure and demand letter responses.
Red flag if sold as one package
- Manual WCAG audit
- Sold as a quick automated scan.
- Automated testing setup
- Promised as complete compliance.
- Assistive technology user testing
- Skipped because a developer tried a screen reader once.
- Legal risk review
- Offered without naming a state or federal standard.
ADA Title III is the main federal risk for private businesses. The U.S. Department of Justice enforces the ADA and has said the law applies to websites, and federal courts have applied it the same way.
Federal contractors may face Section 508 requirements. WCAG 2.2 success criteria are published by the World Wide Web Consortium (W3C), the standards body behind the guidelines, and remain the practical benchmark for web accessibility services for agencies. A web design project estimation without undercharging helps you quote manual testing hours accurately.
Packages combining all four scopes without separate evidence are a risk.
Accessibility Service Scopes
Manual WCAG audit
- What it covers
- Human checks code
- Red flag
- Sold as quick scan
Automated testing setup
- What it covers
- Tools monitor issues
- Red flag
- Promised complete compliance
AT user testing
- What it covers
- Real users test
- Red flag
- Skipped after one try
Legal risk review
- What it covers
- Lawyer reviews ADA
- Red flag
- No standard named
Questions to ask
These questions work well on a first call. A vendor who dodges them is not a fit.
First-Call Vendor Questions
- Which WCAG version and level?
- Manual testing hours per template?
- What if ADA demand letter?
- Sample audit report with false positives?
- Which automated tool, and how validated?
A vendor who answers with product names instead of WCAG criteria is selling a tool, not a service. A useful follow-up is: "Which criteria does that tool miss by design?"
Automated scans are a starting point, not an audit. Common tools such as axe, WAVE, Lighthouse, or Pa11y catch only a slice of WCAG failures, and none of them test keyboard focus order or screen reader output.
Evidence to request
- A sample manual audit with WCAG success criterion numbers next to each finding, such as 1.1.1 for text alternatives, 1.4.3 for contrast, or 2.1.1 for keyboard access.
- A recorded assistive technology session, not a written summary.
- The tester's credentials, such as IAAP CPACC or WAS.
- A list of the browsers, screen readers, and mobile devices used in the last three audits, by name: JAWS and NVDA on Windows, VoiceOver on macOS and iOS, TalkBack on Android, and Dragon for speech input.
- A written statement of which WCAG criteria the vendor considers not applicable and why.
A web design quality assurance checklist for every launch often misses keyboard traps, so this evidence can be compared against your own launch list before quoting accessibility services. Real testers will show you false positives, not just a clean report.
Evidence to Request
- Sample manual audit with WCAG numbers
- Recorded assistive technology session
- Tester credentials (IAAP CPACC or WAS)
- List of browsers, screen readers, devices
- Written statement of not applicable criteria
Answers that should end the conversation
"We use an overlay, so you do not need manual testing."
End the Conversation?
Vendor says overlay replaces manual testing?
End conversation
Continue
"WCAG is just a guideline, and ADA does not require a specific version."
"We will run one automated scan after launch and fix everything."
Each answer hides a gap, and overlay products do not change underlying code.
Saying WCAG is only a guideline ignores federal court decisions that use WCAG 2.1 or 2.2 as the ADA compliance standard. One automated scan cannot catch keyboard focus order, form error announcements, or screen reader reading order.
If you are deciding whether to outsource this work, web design agency outsourcing has different tax and control questions.
What the agreement must say
The agreement must state the following, and nothing less:
- The WCAG version and conformance level, such as WCAG 2.2 Level AA.
- The exact URLs, page templates, or user flows in scope.
- The browsers, screen readers, and mobile devices tested.
- The party responsible for fixing defects found in the final audit.
- Whether the deliverable includes a VPAT, also called an Accessibility Conformance Report (ACR), for clients who have to document conformance.
- The process for a post-launch ADA demand letter, including who provides documentation and for how long.
- The ownership of audit reports and any underlying data.
A web design maintenance contract often excludes accessibility regression tests, so your agreement should say when retesting happens after content changes. The contract must also state that the client received no legal advice from you unless you are a licensed attorney.
