1. Start with a Technical SEO Audit: What to Demand

You’re about to hire an SEO agency, or you’re already working with one and want to make sure you’re getting real value. The difference between a campaign that moves the needle and one that just burns budget often comes down to how well you define the scope, how clearly you brief the technical work, and how honestly you evaluate the results.

This guide walks you through a practical checklist for engaging an SEO agency on technical audits, content strategy, and performance optimization. You’ll learn what to ask for, what to watch out for, and how to structure the work so that every dollar spent has a clear purpose.

1. Start with a Technical SEO Audit: What to Demand

A technical SEO audit is the foundation of any serious campaign. Without it, you’re optimizing blind. The agency should be able to explain not just what they find, but why it matters for your specific site.

What a proper audit must include:

• Crawl analysis: The agency should run a full crawl of your site using tools like Screaming Frog or Sitebulb. They need to identify crawl errors, redirect chains, and pages that are blocking search engines.
• Site structure review: Check for logical URL hierarchy, proper internal linking, and whether your site’s architecture supports both user navigation and search engine crawling.
• Indexation status: They should tell you which pages are indexed, which are blocked, and why. A common issue is pages accidentally excluded via robots.txt or noindex tags.
• Core Web Vitals assessment: This is non-negotiable. The audit must include real-user data from Google Search Console and lab data from Lighthouse. Look for specific issues with LCP (largest contentful paint), CLS (cumulative layout shift), and INP (interaction to next paint).
• XML sitemap and robots.txt review: These files are often neglected. The agency should verify that your sitemap is up to date, includes only canonical pages, and is submitted to Google. The robots.txt file should not accidentally block important resources like CSS or JavaScript.

Red flag: If the agency promises guaranteed rankings after the audit, walk away. No honest audit makes that claim.

2. Crawl Budget and Site Health: The Hidden Lever

Many site owners don’t realize that Google allocates a limited crawl budget to each site. If your site has thousands of low-value pages, thin content, or broken links, Google may waste that budget on pages that don’t matter, leaving your important content unindexed.

What to ask the agency:

• How are you optimizing our crawl budget?
• Are there pages that should be noindexed or consolidated?
• Is our internal linking structure helping or hurting crawl efficiency?

Risk-aware note: Be cautious with redirect chains. A single redirect is fine, but longer chains waste crawl budget and can dilute link equity. The agency should map out all redirects and flatten them where possible.

3. On-Page Optimization and Content Strategy: Beyond Keywords

On-page optimization has evolved far beyond stuffing keywords into meta tags. Modern on-page SEO is about aligning content with search intent, structuring pages for readability, and ensuring technical elements like canonical tags are correct.

Key deliverables from the agency:

• Keyword research and intent mapping: The agency should cluster keywords by intent (informational, navigational, commercial, transactional). A page targeting “best running shoes” needs a different structure than one targeting “how to choose running shoes.”
• Content gap analysis: They should identify topics your competitors rank for that you don’t. This is where content strategy becomes actionable.
• Canonical tag implementation: If you have duplicate content issues (common with e-commerce product variants or pagination), the agency must explain how they’ll use canonical tags to point search engines to the preferred version.
• Duplicate content resolution: This isn’t just about text. Duplicate meta descriptions, title tags, and even URL parameters can cause problems. The audit should flag all instances.

Practical tip: When briefing a content strategy, ask the agency to show you their content calendar for the first 90 days. If it’s just a list of blog post titles without intent mapping or keyword data, it’s not a strategy—it’s a wish list.

4. Link Building: The High-Risk, High-Reward Frontier

Link building is where many campaigns go wrong. Black-hat tactics like buying links from private blog networks (PBNs) or using automated outreach tools can result in Google penalties that take months to recover from.

What a responsible agency should do:

• Backlink profile audit: Before building new links, they should analyze your existing backlinks. They need to identify toxic links and disavow them if necessary.
• Outreach strategy: Legitimate link building involves creating valuable content and reaching out to relevant sites. The agency should have a clear process for vetting potential link sources.
• Trust Flow and Domain Authority monitoring: While these metrics are not official Google signals, they help gauge the quality of your link profile. The agency should track changes and explain why certain links are worth pursuing.

Risk-aware warning: If the agency offers a package that includes a very high number of links in a very short time at a flat rate, be skeptical. High-quality link building is slow and relationship-based. Rapid link acquisition is often a sign of low-quality or spammy tactics.

5. Performance Optimization: Core Web Vitals and Beyond

Site performance is now a ranking factor, and it directly impacts user experience. A slow site will bleed visitors, especially on mobile.

What to expect from the agency:

• Core Web Vitals optimization plan: They should prioritize fixes based on impact. For example, optimizing LCP might involve server response time improvements, image compression, or removing render-blocking resources.
• Performance monitoring: The agency should set up dashboards in Google Search Console and tools like Lighthouse CI to track performance over time.
• Mobile-first testing: Most traffic comes from mobile devices. The agency must test your site on real devices, not just in desktop emulators.

Comparison table: Performance optimization approaches

Note: Performance optimization often requires collaboration with your development team. The agency should provide clear, prioritized recommendations that developers can implement without guesswork.

6. Reporting and Analytics: Measuring What Matters

The agency should not just send you a monthly PDF with vague statements like “traffic increased.” You need transparent, actionable reporting.

What to look for in reports:

• Organic traffic by landing page: Which pages are driving results?
• Keyword position changes: Track both high-volume and long-tail keywords.
• Conversion tracking: Are visitors from organic search actually converting? If not, why?
• Crawl and indexation stats: How many pages are indexed now versus last month?

Red flag: If the agency reports only “organic sessions” without context, they’re hiding the real story. A spike in traffic from irrelevant keywords is not a win.

7. The Final Checklist: What to Verify Before Signing

Before you commit to a long-term contract, run through this checklist with the agency:

• They have provided a sample technical audit report for a similar site.
• They can explain how they handle crawl budget optimization.
• They have a clear process for resolving duplicate content and canonical issues.
• Their link building strategy is documented and avoids black-hat tactics.
• They have a plan for Core Web Vitals improvement with timelines.
• Their reporting includes conversion data, not just traffic metrics.
• They are transparent about risks—no promises of guaranteed rankings.

Summary: Your Role in the Partnership

An SEO agency can’t do it all alone. You need to provide access to your analytics, development resources, and decision-makers. The best campaigns are partnerships where the agency brings expertise, and you bring execution capability.

Start with a thorough technical audit, build a content strategy based on real intent data, pursue link building cautiously, and demand performance metrics that tie to business outcomes. If the agency pushes back on any of these points, you have your answer.

For more on how to structure your technical foundation, read our guide on technical SEO and site health.