If you’ve ever wondered why a competitor keeps outranking you despite a weaker product range, the answer is probably somewhere in their technical SEO. It’s the part of search most brands overlook because it lives under the surface, with no clear immediate wins or visible output. Just clean, well-structured groundwork that tells search engines your site is worth trusting.
For eCommerce stores, that groundwork is harder to maintain than most people realise. Thousands of product pages, layered filters, variant URLs and category structures all create complexity that compounds over time. Left unchecked, it chips away at rankings, crawl efficiency and ultimately revenue. Every other channel performs better when the technical foundations are solid.
This guide breaks down what technical SEO actually involves, where the most common problems show up in eCommerce stores, and how to prioritise fixing them.
Table of Contents
- What Is Technical SEO?
- Crawlability: Can Google Find Your Pages?
- Site Speed and Core Web Vitals
- Duplicate Content
- Structured Data
- Internal Linking
- Mobile and HTTPS
- Where to Start
- Technical SEO Is Not a One-Off Job
- FAQs
What Is Technical SEO?
Technical SEO refers to the behind-the-scenes work that helps search engines find, read and understand your website. Think of it as the plumbing in your store. Customers don’t see it, don’t think about it and certainly don’t compliment it, but the moment something goes wrong, everyone notices.
For eCommerce stores, this is especially important. You’re dealing with hundreds or thousands of product pages, category structures, filters, variants and duplicate content issues that simply don’t exist for a simple blog or service site. The technical complexity scales with the catalogue.
Why Technical SEO Matters for eCommerce
| Issue | Impact |
|---|---|
| Slow page speed | Higher bounce rates, lower conversions |
| Poor crawlability | Key pages never get indexed |
| Duplicate content | Rankings split across multiple URLs |
| Missing structured data | No rich results in Google |
| Broken internal links | Lost link equity, poor user experience |
Slow page speed
Poor crawlability
Duplicate content
Missing structured data
Broken internal links
If Googlebot can’t crawl your site efficiently, no amount of content or backlinks will save your rankings. Technical SEO is the groundwork everything else builds on, and it’s a core part of what we cover with our SEO services.
Crawlability: Can Google Actually Find Your Pages?
Before a page can rank, it needs to be found and indexed. Sounds obvious, yet it’s surprisingly common for eCommerce stores to accidentally block key pages through misconfigured robots.txt files, leftover noindex tags from a staging environment, or internal links that go nowhere useful.
The Right Tools for the Job
Screaming Frog crawls your site the way Googlebot does and flags orphan pages, redirect chains and broken links. Google Search Console shows which pages Google has actually indexed and which ones it’s struggling with. Between the two, you’ll get a clear picture of what’s going on.
What to Check in a Crawlability Audit
- Are your most important category and product pages indexed?
- Do you have redirect chains longer than two hops? These bleed link equity and slow things down.
- Is your XML sitemap up to date and submitted to Search Console?
- Are any pages accidentally set to noindex?
- Do you have orphan pages with no internal links pointing to them?
A clean crawl is the starting point for any serious technical SEO work. Get this right before worrying about anything else.
Site Speed and Core Web Vitals
Google’s Core Web Vitals have been a ranking factor for several years now, and the reason they matter isn’t arbitrary. Page speed directly affects how people experience your store. A one-second delay in load time can reduce conversions by around 7%, according to data from BigCommerce. For a brand turning over £3M a year, that’s not a rounding error.
The Three Core Web Vitals Explained
| Metric | What It Measures | Good Score |
|---|---|---|
| Largest Contentful Paint (LCP) | How fast the main content loads | Under 2.5 seconds |
| Interaction to Next Paint (INP) | How quickly the page responds to input | Under 200ms |
| Cumulative Layout Shift (CLS) | How much the page shifts while loading | Under 0.1 |
Largest Contentful Paint (LCP)
Interaction to Next Paint (INP)
Cumulative Layout Shift (CLS)
How to Measure Your Speed
PageSpeed Insights is free and comes straight from Google. GTmetrix gives a more detailed breakdown of what’s causing slowdowns. For real-world data rather than lab conditions, the Core Web Vitals report inside Search Console is where to look.
If you’re on Shopify or BigCommerce, there are platform-specific limitations to what you can control — not everything is in your hands. That’s why working with an agency that understands both eCommerce platforms and technical SEO makes a real difference.
Duplicate Content: The Silent Killer for Product-Heavy Stores
Here’s something that catches a lot of eCommerce brands off guard. Your product pages might be generating duplicate content without you knowing it.
This happens through URL parameters. When a customer filters by size, colour or price, a new URL is often created. Each filtered URL can look like a separate page to Google, and if they’re all showing similar content, you’ve got a duplication problem. The same goes for product variants and pagination.
Common Sources of Duplicate Content in eCommerce
- Faceted navigation (filters creating new URLs)
- Product variants (same product, different colour or size)
- Pagination (/page/2, /page/3 and so on)
- HTTP vs HTTPS versions of the same page
- www vs non-www versions running simultaneously
How to Fix It
Canonical Tags
These tell Google which version of a page is the authoritative one. For filtered or parameterised URLs, the canonical should point back to the clean category or product page.
Parameter Handling in Search Console
You can instruct Google not to crawl certain URL parameters at all, which prevents filtered pages from being indexed in the first place.
Consistent URL Structure
Pick one format and stick to it across the entire site. Trailing slash or no trailing slash, www or non-www – just be consistent and make sure everything else redirects to your chosen format.
Duplicate content doesn’t usually result in a penalty, but it does dilute your rankings by splitting signals across multiple URLs that should all be pointing to one.
Structured Data: Helping Google (and AI) Understand Your Products
Structured data is one of those things that feels technical but has very visible payoffs. Mark up your product pages with schema and Google can show rich results in search, including price, availability and star ratings. These make your listing stand out and tend to improve click-through rates meaningfully.
Useful Schema Types for eCommerce
| Schema Type | What It Does |
|---|---|
| Product | Shows price, availability and reviews in search |
| BreadcrumbList | Displays site structure in search results |
| FAQPage | Adds expandable Q&As directly in the results |
| Organization | Builds brand trust signals |
| Review/AggregateRating | Displays star ratings alongside your listing |
Product
BreadcrumbList
FAQPage
Organization
Review/AggregateRating
Why Structured Data Matters Beyond Google
There’s a growing reason to take this seriously that goes beyond traditional search. AI-driven tools like ChatGPT and Perplexity increasingly pull structured product and brand information when answering shopping queries, which is something we covered in depth in our piece on optimising for Google, AI and social search. Getting your data clean and well-marked-up now puts you in a much stronger position as these platforms grow.
Internal Linking: The Underrated Lever
Most eCommerce stores underestimate how much their internal linking structure affects rankings and technical SEO. Every internal link is a small vote, passing authority from one page to another. If your homepage and top category pages receive all your inbound links but that authority never flows down to product pages, those product pages will struggle regardless of how good they are. It’s a similar principle to why link quality matters more than volume — relevance and intent count for a lot.
Internal Linking Tips for eCommerce
Here are our top tips for internal linking:
- Link from high-authority pages (homepage, top categories) down to key product pages
- Use descriptive anchor text that includes relevant keywords naturally
- Add breadcrumbs. They improve both technical SEO and user experience simultaneously
- Use “related products” and “you might also like” sections intentionally, not just to fill space
- Audit regularly for orphan pages that receive no internal links at all
Think of it as directing traffic. The pages you most want to rank need links pointing to them, and that won’t happen by accident.
Mobile and HTTPS: Non-Negotiables
Google has used mobile-first indexing since 2019, meaning it primarily uses the mobile version of your site to determine rankings. A slow, cluttered or hard-to-navigate mobile experience affects your rankings everywhere, not just for mobile users.
Quick Mobile Checklist
- Does your site pass Google’s Mobile-Friendly Test?
- Are buttons and links large enough to tap easily?
- Is text readable without zooming in?
- Do images scale correctly on smaller screens?
- Are pop-ups avoiding the main content area?
HTTPS Is Non-Negotiable
HTTPS is equally non-negotiable. If your site still runs on HTTP, that’s a trust signal problem and a ranking issue rolled into one. Most hosting providers offer free SSL certificates now, so there really is no excuse.
Where to Start: Prioritising Your Technical SEO Work
A thorough technical SEO audit can surface a long list of issues, and not all of them will move the needle equally. Here’s a sensible order of priority:
- Indexation and crawlability. Are your pages even being found?
- Core Web Vitals. This is especially important on mobile
- Duplicate content and canonicals. This is essential for large catalogues
- Structured data. Product schema first, then breadcrumbs and FAQs
- Internal linking. Always ensure authority flows to the right pages
- HTTPS and mobile. Confirm that these basics are locked in
Every site is different. A proper audit will tell you what’s most urgent for your specific platform, catalogue size and traffic patterns rather than offering a generic checklist.
Technical SEO Is Not a One-Off Job
Sites change. New pages get added, platforms update and redirects get layered on top of redirects. What was clean six months ago might have several new issues today, and you won’t know unless you’re looking.
The brands that grow consistently treat technical health as an ongoing process rather than a project with a finish line. Monthly crawls, quarterly audits and a team that knows what they’re looking at – that’s what separates stores that plateau from the ones that keep climbing.
If you’re running a £3M+ eCommerce brand and want a proper look at what’s happening under the bonnet, that’s exactly the kind of work eComOne does. Take a look at our eCommerce SEO service or get in touch to start the conversation.
Frequently Asked Questions About Technical SEO
How is technical SEO different from on-page SEO?
How long does a technical SEO audit take?
How often should I run a technical SEO audit?
Does technical SEO affect conversions as well as rankings?
Is technical SEO different for Shopify vs BigCommerce?
About the Author
Carrianne Dukes
Head of Brand
Carrianne Dukes is Head of Brand at eComOne and a member of the leadership team, where she oversees the agency’s positioning, marketing, and reputation. She leads eComOne’s national events portfolio, global podcast, CSR initiatives, and partnership ecosystem, while also managing and developing her own team. Outside of work, Carrianne has never shied away from a […]
