SEO Audit Checklist 2026: 223 Checks, Autumn Update on Content, Links and AI Search

SEO audit checklist 2026 - 223 checks across twelve areas, from North SEO Vancouver

What an SEO audit is, and what it is not

An audit is a diagnosis. It answers one question: why does this website get the search results it gets, and what would change them? It looks at the site the way Google, an AI assistant and a customer each see it, finds where those three views disagree, and puts the fixes in order of impact.

An audit is not a PDF from a tool. Every crawler will produce a 90-page export of warnings; we have seen owners pay for those and receive nothing they could act on. It is also not a score. Tools that grade a site 74/100 are measuring what is easy to measure. A site can score 95 and have no business being on page one for the queries that matter, because the checks that decide that - intent match, content depth, links from the right places, an accurate Google Business Profile - are the ones a script cannot grade.

And it is not a strategy. The audit tells you what is broken and what is missing. The strategy decides what to build. We deliver them separately (an audit is $997, a full strategy is a separate engagement) because a strategy built before the audit is guesswork.

How we run an audit, and how to read this checklist

Our standard audit covers a site of up to 50 pages, takes five business days, and comes back as a 40+ page report plus a 30-minute walkthrough call. We crawl the site, pull Search Console and analytics, benchmark the three businesses that outrank you, and then work through the twelve sections below by hand. The report leads with the ten findings that matter, then the full detail by section. Larger sites are quoted separately - the showcase audit we discuss further down covered a retailer with millions of URLs and took considerably longer than five days.

Every check on this page has three parts: what we are looking for and why it matters, how to check it yourself, and a priority. Critical means the problem can stop the site from ranking at all or is a policy risk. High means it is holding back rankings or leads on the pages that earn money. Medium is hygiene: worth doing, rarely the reason a site under-performs. Tick the boxes as you go; the page remembers your progress in this browser. If you want the checklist as a document, use Print.

One warning before you start. It is easy to spend a weekend fixing forty Medium items and feel productive. Do the Criticals first, then the Highs on your five most important pages, then stop and measure. Most sites we audit have three to six problems that explain almost everything, and section 13 is about finding them.

1. Crawlability and Indexation

Nothing else on this list matters if Google cannot reach the page, or reaches it and decides not to keep it. We start every audit here because index problems are usually the cheapest to fix and the most expensive to ignore. In the showcase audit we ran on target.com, two of the biggest findings lived in this section: a video sitemap over the 50 MB limit and an image sitemap with more than 50,000 URLs, which means Google was silently discarding part of the catalogue.

Checklist: Crawlability and Indexation0/24 done

2. Speed, Core Web Vitals and Rendering

Speed is a ranking factor at the margins and a conversion factor everywhere. In 2026 we care less about the PageSpeed score and more about the three Core Web Vitals measured on real users: Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift. A green lab score with a red field score is still a failing page. Optimisation is done page by page - the home page, the top service page and a blog article rarely share the same problems.

Checklist: Speed, Core Web Vitals and Rendering0/22 done

3. Site Architecture and Internal Linking

Architecture is how authority flows. A site can have great content and good links and still under-perform because the money pages are buried four clicks deep while the privacy policy sits in every footer. Our default model is hub-and-spoke: a service hub, city or topic spokes underneath, and every spoke linking back up and sideways.

Checklist: Site Architecture and Internal Linking0/14 done

4. On-Page Optimisation

On-page is where keyword research meets the actual HTML. The audit question is not 'is the keyword present' but 'does each page have one clear job, and does every signal on it agree'. Duplicate titles and missing H1s are still the most common findings in 2026, especially on e-commerce sites where two products share a name.

Checklist: On-Page Optimisation0/22 done

5. Content Quality - Autumn 2026 Update Autumn 2026 update

This is the section we rewrote for autumn 2026. Google published its own checklist for what good content looks like - the "Creating helpful, reliable, people-first content" guide - and it contains 32 self-assessment questions plus a short "Who, How, Why" framework. For years agencies paraphrased it. This year Steve Toth (SEO Notebook) turned the questions into a custom AI page grader: paste a page into his Custom GPT or Claude Project and it returns PASS, FAIL, PARTIAL or N/A for each of the 32 questions, an overall letter grade, the biggest problems, a prioritised roadmap and an offer to rewrite the sections that failed. Google wrote the exam; Steve built the marking machine. We now run every important page through it as a standard audit step, and we have folded the 32 questions directly into this checklist so you can do it by hand too.

A note on how we grade. The questions are Google's; the wording below is ours. Mark each one honestly. A page that scores PARTIAL on half of them is not a page to publish more of - it is a page to fix.

Checklist: Content Quality - Autumn 2026 Update0/39 done

Content and quality (Google's 12 questions)

Expertise (4 questions)

Information presented in a way that makes you want to trust it - sourcing, evidence of expertise, author and site background High
Links to sources, an author with a real profile, an About page with the real business behind it.
How to check: Check for a byline, an author page and cited sources.
The site would come across as well-trusted or a recognised authority if someone researched it High
Reviews, mentions, credentials, licences, a physical address.
How to check: Google the brand; read what comes up beyond your own site.
Written or reviewed by an expert or enthusiast who demonstrably knows the topic High
For YMYL topics (health, money, legal, safety) this is not optional.
How to check: Is the author's expertise stated and verifiable?
No easily verified factual errors Critical
One wrong statute number or price undermines every other claim on the page.
How to check: Fact-check every number, date, name and claim.

People-first (5 questions)

An existing or intended audience would find it useful if they came to you directly High
The test for whether the page exists for readers or for Google.
How to check: Would you send this to a current customer who asked?
Clearly demonstrates first-hand expertise - having used the product, done the service, visited the place High
The 'Experience' in E-E-A-T. Photos you took, results you measured, mistakes you made.
How to check: Look for evidence of first-hand involvement: your photos, your numbers, your process.
The site has a primary purpose or focus Medium
A plumbing site with articles on crypto and recipes has no focus.
How to check: Review the blog categories against the business.
The reader leaves having learned enough to achieve their goal High
Not 'more traffic' - the reader's goal.
How to check: State the reader's goal in one sentence; check the page gets them there.
The reader leaves feeling they had a satisfying experience Medium
Pop-ups, ads, walls of text and buried answers all fail this.
How to check: Read the page as a stranger on a phone.

Search-engine-first warning signs (11 questions - a YES is a fail)

Who, How and Why

WHO: it is self-evident who wrote the content; bylines where expected; bylines link to real author pages High
Google's 'Who'. A real name, a photo, a bio and a way to verify them.
How to check: Check for a byline and click it.
HOW: automation or AI use is disclosed where a reader would reasonably wonder Medium
Google does not require a disclosure on every page - only where 'how was this made?' is a natural question.
How to check: Decide per page type; add a short process note where appropriate.
HOW: background on how the content was produced (tests run, sources used, method) Medium
A methods paragraph turns a claim into evidence.
How to check: Look for 'how we tested' or 'how we know' sections.
WHY: the content exists primarily to help people, and would be useful to a direct visitor Critical
Google calls this 'perhaps the most important question'.
How to check: Answer it honestly for every page type on the site.
E-E-A-T: trust is present - contact details, policies, accurate claims, reviews, secure site Critical
Of Experience, Expertise, Authoritativeness and Trust, Google says trust is the most important. The other three feed it.
How to check: Check the trust signals across the whole site, not just the page.
YMYL pages meet a higher bar: expert review, sources, dates, disclaimers High
Health, finance, legal and safety content is held to stricter E-E-A-T standards.
How to check: Identify YMYL pages and audit them separately.
Run the page through an AI grader against the 32 questions and act on the roadmap High
Steve Toth's grader (Custom GPT and Claude Project versions) returns a grade, the biggest problems and a fix order in a minute. It is the fastest honest second opinion we have found.
How to check: Paste the page in, record the grade, fix the FAILs first, then the PARTIALs.

6. Structured Data and Entities

Schema markup is the one part of the LLM conversation where we have hard evidence: it works. Pages with clean Organization, LocalBusiness, Service, Product and FAQ markup get cited by AI assistants more consistently and pick up rich results in Google. Most sites we audit have breadcrumbs and nothing else - target.com, at the time of our showcase audit, was exactly that.

Checklist: Structured Data and Entities0/12 done

7. Local SEO and Google Business Profile

For any business that serves a city or a region, the Google Business Profile is worth more than the website for phone calls. We cover it in depth in our GBP optimisation blueprint and the post-reinstatement guide; the checks below are the audit view. Two rules from our own work: a profile ranks strongest within a few kilometres of its verified address, and the fastest way to lose a profile is to edit the name, address or category the week after it was verified.

Checklist: Local SEO and Google Business Profile0/20 done

8. Backlinks and Off-Page - Autumn 2026 Update Autumn 2026 update

Links still decide close races, and the audit still starts with the same questions it did five years ago: who links to you, with what anchor, from what kind of site, and how does that compare with the businesses above you. What changed in 2026 is what we do with the answer.

Our link strategy this year is built on PR and connections rather than placements. The old model was buying guest posts on general sites with an SEO metric attached. The new model is: identify the businesses and organisations your customers already trust - suppliers, complementary trades, industry associations, local media, community groups - make real contact, and produce content good enough for them to want to cite. A Vancouver painting contractor gets more from one link from a local supplier's 'recommended installers' page and one mention in a neighbourhood publication than from ten links on 'home improvement blogs' nobody reads. Local first, relationships second, metrics third. This also happens to be exactly the kind of link that shows up in AI answers, because assistants weight mentions from sources people recognise.

Checklist: Backlinks and Off-Page - Autumn 2026 Update0/20 done

9. AI Search and LLM Readiness - Autumn 2026 Update Autumn 2026 update

Every agency now sells 'AI SEO', 'GEO' or 'AEO' as a separate product. Our position after a year of watching it on client sites: LLM optimisation is 95% the same work as SEO. Google AI Overviews, AI Mode, ChatGPT, Perplexity and Claude all cite pages that are crawlable, fast, well-structured, authoritative and truthful. The remaining 5% is a set of habits, and we list them here.

Three observations from our own sites and client sites in 2025-2026. First, llms.txt does not work - we have one on northseo.ca, we have watched the logs, and we have seen no evidence any major assistant reads it or that it changes citations. It costs nothing, so keep it, but do not sell it. Second, schema.org markup works well: pages with complete entity markup are picked up and described more accurately. Third, citations work well - being mentioned and linked on sites the models already trust is the most reliable route into AI answers we have found.

The rest of what matters is content behaviour: answer the question at the top of the page, then be as comprehensive as the topic deserves so one page can satisfy as many variations of the customer's request as possible, and write only what is true and demonstrable. AI assistants are summarising you to a customer. If the page exaggerates, the assistant either repeats the exaggeration (and the wrong client shows up) or discounts the source. Truthful, E-E-A-T-grade content is how you get the right clients and an accurate representation of the business in someone else's answer.

Checklist: AI Search and LLM Readiness - Autumn 2026 Update0/18 done

10. Analytics, Tracking and Measurement

Half the audits we do begin with a site that has three analytics tags, none of them measuring a phone call. An SEO programme without conversion tracking is a traffic programme. Measurement is also the first thing we set up on a new retainer, which is why it is a product on its own in our store.

Checklist: Analytics, Tracking and Measurement0/12 done

11. Conversion and User Experience

Ranking is a means. We check the page as a customer, because a page that ranks and does not convert is a cost. These are the checks we make on every money page.

Checklist: Conversion and User Experience0/10 done

12. Security, Compliance and Hygiene

Boring until it is not. A hacked site, a lapsed certificate or a domain that quietly expired will undo a year of SEO in a week. These checks take twenty minutes.

Checklist: Security, Compliance and Hygiene0/10 done

Showcase: what a real audit finds (target.com)

We do not publish client audits. To show what the process produces, in 2022 we ran the full checklist on a site that did not hire us: target.com, one of the largest retailers in North America, with a team and a budget most businesses will never have. The point was not to embarrass anyone - the point is that if a site at that scale has these findings, yours almost certainly has some of them too.

Sitemaps over the limit. A video sitemap over 50 MB and an image sitemap with more than 50,000 URLs. Both are rejected in full by Google, which means part of the catalogue was never being submitted at all. Section 1, check 5.
Roughly 700,000 broken backlinks. Links from other websites pointing at Target pages that no longer existed. Every one is authority the site had earned and then discarded. The fix is a redirect map, not new link building. Section 3, check 13 and Section 8, check 3.
Structured data limited to breadcrumbs. No Product, Organization, WebSite or AggregateOffer markup on a site with hundreds of thousands of products. Section 6.
'No response' URLs in the crawl that returned 200 by hand. The site was built in React, and pages that rendered slowly were being read as unavailable. Googlebot may also miss pages that take a long time to load. Section 1, check 21 and Section 9, check 16.
robots.txt used as a noindex. Disallow rules on pages that were still in the index, because Disallow does not remove pages. Section 1, check 3.
Duplicate titles and H1s from identical product names, empty H3 tags in every product card, sub-category pages sharing the same copy, a 404 page with the wrong title, the cart page indexed, and mobile speed in the red on every template we tested.

None of those were exotic. They were the first six sections of this checklist, applied carefully. That is the whole method.

Turning 223 checks into a plan

The checklist is exhaustive on purpose. The plan should not be. Here is how we reduce the findings to something a business can execute in a quarter.

First, separate blockers from everything else. A blocker is a Critical that stops Google, an AI assistant or a customer from reaching or trusting the site: a noindex on the money pages, a robots.txt block, a hacked site, a suspended Business Profile, a site that only renders in JavaScript, claims on the site that are not true. Blockers are fixed this week, before anything else, because nothing else will register until they are.

Second, pick the five pages that should make the phone ring and apply every High in sections 4, 5, 6, 9 and 11 to those pages only. Do not touch the other two hundred pages yet. Five excellent pages beat two hundred slightly improved ones, and they give you a measurable before and after.

Third, fix the site-wide technical Highs - speed, redirects, canonicals, internal linking - because those lift every page at once and are usually one developer ticket each.

Fourth, start the slow work: the content programme from section 5, the partner and PR outreach from section 8, the review and citation work from section 7. These compound over months and they are where an ongoing retainer earns its fee.

Finally, measure. Section 10 exists so that in ninety days you can say what changed in leads, not in scores. If you cannot, the audit was a document, not a diagnosis.

If you would rather have us run the audit, it is $997 CAD in the store, or start with the free website analyzer and a call. Either way you will get the same checklist, applied to your site, with the findings in the order they should be fixed.

Frequently asked questions

What is an SEO audit?

An SEO audit is a structured review of everything that affects how a website is crawled, indexed, ranked and converted: technical health, site structure, on-page optimisation, content quality, structured data, backlinks, local signals, analytics and, since 2025, readiness for AI search. The output is a prioritised list of problems and the fixes for each, not a score.

How long does an SEO audit take?

Our standard audit for a site of up to 50 pages is delivered within 5 business days as a 40+ page PDF with a prioritised action plan and a 30-minute walkthrough call. Larger sites, e-commerce catalogues and multi-language sites are quoted separately and usually take two to three weeks.

How much does an SEO audit cost in Canada?

Our SEO Audit is $997 CAD one-time for sites up to 50 pages, and includes a 200+ point technical crawl, competitor gap analysis, a keyword opportunity map and the walkthrough call. You can buy it directly in our store or start with the free website analyzer.

How often should a website be audited?

A full audit once a year, a technical health check every quarter, and a lightweight check after any redesign, migration, platform change or major Google update. Ongoing retainers include monitoring, so the annual audit becomes a review rather than a rescue.

Do I need a separate 'AI SEO' or GEO audit?

No. In our experience LLM optimisation is about 95% the same work as SEO. The remaining 5% - AI crawler access, answer-first page structure, entity markup, third-party citations and citation tracking - is covered in section 9 of this checklist and is part of every audit we deliver.

Which tools do you use for an SEO audit?

Google Search Console and GA4 first, then a crawler (Screaming Frog), PageSpeed Insights and CrUX data, Ahrefs or Semrush for backlinks and competitor gaps, the Rich Results Test and Schema Markup Validator, SSL Labs, VirusTotal, the Wayback Machine, a local rank grid tool, and for content quality an AI grader built on Google's 32 helpful-content questions.

Can I do this audit myself?

Yes - that is why the checklist above has a 'how to check' line and a tick box on every item. Most owners can complete the crawlability, on-page, content and local sections in a weekend with free tools. Where it usually pays to bring in help is interpreting the findings, prioritising them and doing the technical fixes.

How this article was made: the checklist is the working document we use on audits, edited for publication. The content-quality section reproduces the intent of Google's 32 self-assessment questions from its "Creating helpful, reliable, people-first content" guide in our own words; the grader we reference is Steve Toth's, published in his SEO Notebook newsletter. Observations about AI search are from our own sites and client sites over 2025-2026 and will be updated as they change. Drafting and formatting were assisted by AI tools; every check was reviewed and edited by the author.

The SEO Audit Checklist for 2026: 223 Checks, With the Autumn 2026 Update on Content Quality, Links and AI Search