Website Security Audits for Agencies: How to Add Security Reports to Your Client Services

Why Agencies Are Getting Asked About Website Security

A client asks: "Is our website secure?" Most web agencies don't have a clean answer. Not because they don't care, but because security audits have traditionally sat outside the standard web development workflow — something left to penetration testers, compliance teams, or specialist security firms.

That gap is closing fast. Clients are increasingly aware that websites get attacked, data gets exposed, and Google flags insecure sites. Regulated industries — healthcare, legal, finance, education — are starting to ask for proof. And agencies that can hand over a clear security report alongside their design and development work are differentiating themselves from everyone else who just shrugs.

The good news: adding website security audits to your agency services doesn't require becoming a cybersecurity firm. It requires the right tooling and a simple process.

What a Website Security Audit Actually Covers

A proper external website security audit checks the things that are visible from outside the site — the same things an attacker would see first. This includes:

• SSL/TLS configuration — certificate validity, protocol versions, cipher strength, HSTS
• Security headers — Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy
• Cookie security — HttpOnly, Secure, SameSite flags on session cookies
• CORS configuration — whether the API accepts requests from any origin
• DNS and email authentication — SPF, DKIM, DMARC records that prevent domain spoofing
• Mixed content — HTTP resources loading on HTTPS pages
• JavaScript library vulnerabilities — outdated libraries with known CVEs
• Information disclosure — server headers, generator tags, exposed config files
• Redirect security — HTTP-to-HTTPS redirect chains, open redirect risks

This is not a penetration test. It doesn't involve exploiting vulnerabilities, testing authentication flows, or injecting payloads. It's an external posture check — fast, repeatable, and safe to run on any site including client sites you don't host.

That distinction matters when you're talking to clients. You're not doing security research on their systems; you're checking whether their site's publicly visible configuration follows best practices.

How to Position a Security Audit to Clients

The framing that works best with non-technical clients is simple: a security report is the same kind of quality check as a performance report.

Most agencies already send clients Lighthouse scores, PageSpeed reports, or uptime dashboards. A security grade sits naturally next to those. It answers the question clients are increasingly asking without making the conversation feel alarmist.

Some framing that lands well:

• "As part of your quarterly review, we ran a security check on your site. Here's where things stand."
• "Before we hand over the new site, we ran a security scan. There are a couple of items we want to fix before launch."
• "One of the things we include in our care plan is a monthly security check. This month's report is attached."

Avoid framing it as "your site is vulnerable" or leading with alarm. The goal is to show value, not create panic. A site with a B grade isn't in crisis — it has specific, fixable gaps that your agency can address.

When to Run a Security Audit

There are four natural points in the agency workflow where a security audit adds clear value:

1. Pre-launch

Before handing over a new site, run a scan and fix any issues. This protects you from a client coming back three months later saying their site was flagged as insecure. It's also a strong final quality gate alongside mobile testing and browser compatibility checks.

Include the security report in your launch handover document. It demonstrates rigour and gives the client something tangible to show stakeholders.

2. Existing client audits

Run scans on current client sites during contract renewal conversations or annual reviews. Finding real issues — even minor ones — gives you a concrete reason to propose fixes, which can be billed separately or bundled into an updated care plan.

This is also an honest service. If a client has been live for two years without anyone checking their security headers, they'll appreciate the agency that flagged it before a problem occurred.

3. Prospect outreach

Scan a prospect's site before a proposal call and include a brief summary of what you found. "We noticed your site is missing HSTS and your CSP is not set" is a far stronger conversation opener than a generic capabilities deck.

This works especially well for cold outreach. A personalised scan result is a genuine reason to get in touch, and it immediately demonstrates that you do technical work — not just design.

4. Ongoing monitoring

Security posture changes constantly. A deployment can remove headers. An SSL certificate can expire. A WordPress plugin update can introduce a vulnerability. A client who had an A grade in January might have a C grade in March without anyone noticing.

Monthly or weekly automated rescans, with email alerts when a grade drops, give your agency a reason to stay engaged between project phases and justify a security component in a maintenance retainer.

What to Include in a Client Security Report

A good client-facing security report doesn't need to be technical. It needs to be clear. Here's a structure that works:

1. Overall grade — A through F, with a one-sentence summary of what it means
2. Category scores — SSL, headers, cookies, DNS, etc., so the client can see where the gaps are
3. Issues found — listed by severity (critical, warning, informational) with a plain-English explanation of what each issue is and why it matters
4. Recommended fixes — specific actions, not just "fix your CSP"
5. Next scan date — when you'll check again

The report should carry your agency's branding, not the tool's. A white-label PDF with your logo, your agency name, and your contact details is the difference between a client seeing a piece of your work and a client seeing a third-party tool you forwarded.

How to Price Security Audits

There are three common pricing approaches agencies use:

Bundled into maintenance

Add a monthly security scan to your existing care plan and raise the price by $30–$75/month per site. The scan itself takes seconds. The value to the client is an expert reviewing the results and flagging anything that needs attention.

Standalone audit

Offer a one-time security audit as a fixed-price deliverable: $150–$500 depending on the depth of the report and whether you include fix recommendations or a remediation quote. This works well as an upsell during a proposal or contract renewal.

Pre-launch inclusion

Include a security check in your project process as standard, and add a line item to your project quote: "Pre-launch security audit and report — $200." Clients rarely push back on this because it's clearly a quality measure, not an upsell.

What Happens When Issues Need Fixing

Most issues found in an external security audit are fixable by your existing dev team in a few hours. Missing security headers are configuration changes. Weak SSL settings are server or CDN configuration. Mixed content is a content or code fix. Cookie flags are a backend or CMS settings change.

For clients who don't have ongoing development support, fixing issues is a natural billable engagement. The audit creates the scope. The remediation is the project.

For issues that go beyond external posture — application-level vulnerabilities, authentication flaws, server-side code review — be clear that those require a different engagement (penetration test or code review) and refer appropriately. Don't overstate what an external scan covers.

Running Your First Agency Security Audit

The fastest way to start is to scan one of your own client sites right now and see what comes back. Use WebSentry's free scanner — no account needed, results in under a minute.

If you find issues, you have an immediate and genuine reason to reach out to that client. If the site looks clean, you have proof that your work holds up to a security check — which is just as valuable to include in a case study or proposal.

From there, the workflow scales simply:

1. Scan client sites before launch and before contract renewals
2. Export white-label PDFs with your branding
3. Set up monthly monitors so you get alerts if anything changes
4. Use the reports as a deliverable in your care plan or retainer

You don't need to become a security expert to do this. You need a repeatable process and a tool that produces a clear, client-readable output. The expertise you bring is knowing which fixes to prioritise, how to explain them to a non-technical client, and how to implement the remediation — all things you already do.

The Agency That Gets Asked About Security vs the One That Doesn't

Security is becoming a baseline expectation, not a specialist service. Clients in regulated industries already ask for it. Clients who've had a bad experience with a hacked site ask for it. Clients who read industry news are starting to ask for it.

The agency that can answer "yes, we check that, here's the report" wins that conversation every time. The agency that has to say "we don't really cover security" loses ground — even if their design and development work is excellent.

Adding security audits to your services doesn't require hiring a specialist or changing your stack. It requires a repeatable process, a clear client deliverable, and a tool that handles the technical scanning so you can focus on the review, the recommendation, and the relationship.

Scan your first site with WebSentry — free, no signup required. See what a report looks like before deciding whether it belongs in your client workflow.